Merge pull request 'docs: update all docs for sessions, solver, approvals, and recent features' (#172) from docs/update-status-modules-config into main

Reviewed-on: #172

.env.example

@@ -5,10 +5,6 @@
 # PostgreSQL
 POSTGRES_PASSWORD=silodev
 
-# MinIO
-MINIO_ACCESS_KEY=silominio
-MINIO_SECRET_KEY=silominiosecret
-
 # OpenLDAP
 LDAP_ADMIN_PASSWORD=ldapadmin
 LDAP_USERS=siloadmin

.gitignore

@@ -1,6 +1,7 @@
 # Binaries
 /silo
 /silod
+/migrate-storage
 *.exe
 *.dll
 *.so

Makefile

@@ -11,6 +11,7 @@
 build: web-build
 	go build -o silo ./cmd/silo
 	go build -o silod ./cmd/silod
+	go build -o silorunner ./cmd/silorunner
 
 # Run the API server locally
 run:
@@ -30,7 +31,7 @@ test-integration:
 
 # Clean build artifacts
 clean:
-	rm -f silo silod
+	rm -f silo silod silorunner
 	rm -f *.out
 	rm -rf web/dist
 
@@ -67,7 +68,7 @@ db-shell:
 docker-build:
 	docker build -t silo:latest -f build/package/Dockerfile .
 
-# Start the full stack (postgres + minio + silo)
+# Start the full stack (postgres + silo)
 docker-up:
 	docker compose -f deployments/docker-compose.yaml up -d
 
@@ -94,9 +95,6 @@ docker-logs-silo:
 docker-logs-postgres:
 	docker compose -f deployments/docker-compose.yaml logs -f postgres
 
-docker-logs-minio:
-	docker compose -f deployments/docker-compose.yaml logs -f minio
-
 # Show running containers
 docker-ps:
 	docker compose -f deployments/docker-compose.yaml ps
@@ -166,7 +164,7 @@ help:
 	@echo ""
 	@echo "Docker:"
 	@echo "  docker-build   - Build Docker image"
-	@echo "  docker-up      - Start full stack (postgres + minio + silo)"
+	@echo "  docker-up      - Start full stack (postgres + silo)"
 	@echo "  docker-down    - Stop the stack"
 	@echo "  docker-clean   - Stop and remove volumes (deletes data)"
 	@echo "  docker-logs    - View all logs"

README.md

@@ -34,7 +34,7 @@ silo/
 │   ├── ods/               # ODS spreadsheet library
 │   ├── partnum/           # Part number generation
 │   ├── schema/            # YAML schema parsing
-│   ├── storage/           # MinIO file storage
+│   ├── storage/           # Filesystem storage
 │   └── testutil/          # Test helpers
 ├── web/                   # React SPA (Vite + TypeScript)
 │   └── src/
@@ -55,7 +55,7 @@ silo/
 
 See the **[Installation Guide](docs/INSTALL.md)** for complete setup instructions.
 
-**Docker Compose (quickest — includes PostgreSQL, MinIO, OpenLDAP, and Silo):**
+**Docker Compose (quickest — includes PostgreSQL, OpenLDAP, and Silo):**
 
 ```bash
 ./scripts/setup-docker.sh
@@ -65,7 +65,7 @@ docker compose -f deployments/docker-compose.allinone.yaml up -d
 **Development (local Go + Docker services):**
 
 ```bash
-make docker-up    # Start PostgreSQL + MinIO in Docker
+make docker-up    # Start PostgreSQL in Docker
 make run          # Run silo locally with Go
 ```
 

cmd/silod/main.go

@@ -3,6 +3,7 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"net/http"
@@ -13,12 +14,16 @@ import (
 
 	"github.com/alexedwards/scs/pgxstore"
 	"github.com/alexedwards/scs/v2"
+
 	"github.com/kindredsystems/silo/internal/api"
 	"github.com/kindredsystems/silo/internal/auth"
 	"github.com/kindredsystems/silo/internal/config"
 	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/jobdef"
+	"github.com/kindredsystems/silo/internal/modules"
 	"github.com/kindredsystems/silo/internal/schema"
 	"github.com/kindredsystems/silo/internal/storage"
+	"github.com/kindredsystems/silo/internal/workflow"
 	"github.com/rs/zerolog"
 )
 
@@ -40,7 +45,6 @@ func main() {
 		Str("host", cfg.Server.Host).
 		Int("port", cfg.Server.Port).
 		Str("database", cfg.Database.Host).
-		Str("storage", cfg.Storage.Endpoint).
 		Msg("starting silo server")
 
 	// Connect to database
@@ -60,23 +64,15 @@ func main() {
 	defer database.Close()
 	logger.Info().Msg("connected to database")
 
-	// Connect to storage (optional - may be externally managed)
+	// Connect to storage (optional — requires root_dir to be set)
-	var store *storage.Storage
+	var store storage.FileStore
-	if cfg.Storage.Endpoint != "" {
+	if cfg.Storage.Filesystem.RootDir != "" {
-		store, err = storage.Connect(ctx, storage.Config{
+		s, fsErr := storage.NewFilesystemStore(cfg.Storage.Filesystem.RootDir)
-			Endpoint:  cfg.Storage.Endpoint,
+		if fsErr != nil {
-			AccessKey: cfg.Storage.AccessKey,
+			logger.Fatal().Err(fsErr).Msg("failed to initialize filesystem storage")
-			SecretKey: cfg.Storage.SecretKey,
-			Bucket:    cfg.Storage.Bucket,
-			UseSSL:    cfg.Storage.UseSSL,
-			Region:    cfg.Storage.Region,
-		})
-		if err != nil {
-			logger.Warn().Err(err).Msg("failed to connect to storage - file operations disabled")
-			store = nil
-		} else {
-			logger.Info().Msg("connected to storage")
 		}
+		store = s
+		logger.Info().Str("root", cfg.Storage.Filesystem.RootDir).Msg("connected to filesystem storage")
 	} else {
 		logger.Info().Msg("storage not configured - file operations disabled")
 	}
@@ -178,6 +174,67 @@ func main() {
 		}
 	}
 
+	// Load job definitions (optional — directory may not exist yet)
+	var jobDefs map[string]*jobdef.Definition
+	if _, err := os.Stat(cfg.Jobs.Directory); err == nil {
+		jobDefs, err = jobdef.LoadAll(cfg.Jobs.Directory)
+		if err != nil {
+			logger.Fatal().Err(err).Str("directory", cfg.Jobs.Directory).Msg("failed to load job definitions")
+		}
+		logger.Info().Int("count", len(jobDefs)).Msg("loaded job definitions")
+	} else {
+		jobDefs = make(map[string]*jobdef.Definition)
+		logger.Info().Str("directory", cfg.Jobs.Directory).Msg("job definitions directory not found, skipping")
+	}
+
+	// Upsert job definitions into database
+	jobRepo := db.NewJobRepository(database)
+	for _, def := range jobDefs {
+		defJSON, _ := json.Marshal(def)
+		var defMap map[string]any
+		json.Unmarshal(defJSON, &defMap)
+
+		rec := &db.JobDefinitionRecord{
+			Name:           def.Name,
+			Version:        def.Version,
+			TriggerType:    def.Trigger.Type,
+			ScopeType:      def.Scope.Type,
+			ComputeType:    def.Compute.Type,
+			RunnerTags:     def.Runner.Tags,
+			TimeoutSeconds: def.Timeout,
+			MaxRetries:     def.MaxRetries,
+			Priority:       def.Priority,
+			Definition:     defMap,
+			Enabled:        true,
+		}
+		if err := jobRepo.UpsertDefinition(ctx, rec); err != nil {
+			logger.Fatal().Err(err).Str("name", def.Name).Msg("failed to upsert job definition")
+		}
+	}
+
+	// Load approval workflow definitions (optional — directory may not exist yet)
+	var workflows map[string]*workflow.Workflow
+	if _, err := os.Stat(cfg.Workflows.Directory); err == nil {
+		workflows, err = workflow.LoadAll(cfg.Workflows.Directory)
+		if err != nil {
+			logger.Fatal().Err(err).Str("directory", cfg.Workflows.Directory).Msg("failed to load workflow definitions")
+		}
+		logger.Info().Int("count", len(workflows)).Msg("loaded workflow definitions")
+	} else {
+		workflows = make(map[string]*workflow.Workflow)
+		logger.Info().Str("directory", cfg.Workflows.Directory).Msg("workflows directory not found, skipping")
+	}
+
+	// Initialize module registry
+	registry := modules.NewRegistry()
+	if err := modules.LoadState(registry, cfg, database.Pool()); err != nil {
+		logger.Fatal().Err(err).Msg("failed to load module state")
+	}
+	for _, m := range registry.All() {
+		logger.Info().Str("module", m.ID).Bool("enabled", registry.IsEnabled(m.ID)).
+			Bool("required", m.Required).Msg("module")
+	}
+
 	// Create SSE broker and server state
 	broker := api.NewBroker(logger)
 	serverState := api.NewServerState(logger, store, broker)
@@ -190,9 +247,32 @@ func main() {
 
 	// Create API server
 	server := api.NewServer(logger, database, schemas, cfg.Schemas.Directory, store,
-		authService, sessionManager, oidcBackend, &cfg.Auth, broker, serverState)
+		authService, sessionManager, oidcBackend, &cfg.Auth, broker, serverState,
+		jobDefs, cfg.Jobs.Directory, registry, cfg, workflows)
 	router := api.NewRouter(server, logger)
 
+	// Start background sweepers for job/runner timeouts (only when jobs module enabled)
+	if registry.IsEnabled(modules.Jobs) {
+		go func() {
+			ticker := time.NewTicker(time.Duration(cfg.Jobs.JobTimeoutCheck) * time.Second)
+			defer ticker.Stop()
+			for range ticker.C {
+				if n, err := jobRepo.TimeoutExpiredJobs(ctx); err != nil {
+					logger.Error().Err(err).Msg("job timeout sweep failed")
+				} else if n > 0 {
+					logger.Info().Int64("count", n).Msg("timed out expired jobs")
+				}
+
+				if n, err := jobRepo.ExpireStaleRunners(ctx, time.Duration(cfg.Jobs.RunnerTimeout)*time.Second); err != nil {
+					logger.Error().Err(err).Msg("runner expiry sweep failed")
+				} else if n > 0 {
+					logger.Info().Int64("count", n).Msg("expired stale runners")
+				}
+			}
+		}()
+		logger.Info().Msg("job/runner sweepers started")
+	}
+
 	// Create HTTP server
 	addr := fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port)
 	httpServer := &http.Server{

cmd/silorunner/main.go

@@ -0,0 +1,330 @@
+// Command silorunner is a compute worker that polls the Silo server for jobs
+// and executes them using Headless Create with silo-mod installed.
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/rs/zerolog"
+	"gopkg.in/yaml.v3"
+)
+
+// RunnerConfig holds runner configuration.
+type RunnerConfig struct {
+	ServerURL    string   `yaml:"server_url"`
+	Token        string   `yaml:"token"`
+	Name         string   `yaml:"name"`
+	Tags         []string `yaml:"tags"`
+	PollInterval int      `yaml:"poll_interval"` // seconds, default 5
+	CreatePath   string   `yaml:"create_path"`   // path to Headless Create binary
+}
+
+func main() {
+	configPath := flag.String("config", "runner.yaml", "Path to runner config file")
+	flag.Parse()
+
+	logger := zerolog.New(os.Stdout).With().Timestamp().Str("component", "silorunner").Logger()
+
+	// Load config
+	cfg, err := loadConfig(*configPath)
+	if err != nil {
+		logger.Fatal().Err(err).Msg("failed to load config")
+	}
+
+	if cfg.ServerURL == "" {
+		logger.Fatal().Msg("server_url is required")
+	}
+	if cfg.Token == "" {
+		logger.Fatal().Msg("token is required")
+	}
+	if cfg.Name == "" {
+		hostname, _ := os.Hostname()
+		cfg.Name = "runner-" + hostname
+	}
+	if cfg.PollInterval <= 0 {
+		cfg.PollInterval = 5
+	}
+
+	logger.Info().
+		Str("server", cfg.ServerURL).
+		Str("name", cfg.Name).
+		Strs("tags", cfg.Tags).
+		Int("poll_interval", cfg.PollInterval).
+		Msg("starting runner")
+
+	client := &http.Client{Timeout: 30 * time.Second}
+
+	// Graceful shutdown
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+
+	// Heartbeat goroutine
+	go func() {
+		ticker := time.NewTicker(30 * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				if err := heartbeat(client, cfg); err != nil {
+					logger.Error().Err(err).Msg("heartbeat failed")
+				}
+			case <-quit:
+				return
+			}
+		}
+	}()
+
+	// Initial heartbeat
+	if err := heartbeat(client, cfg); err != nil {
+		logger.Warn().Err(err).Msg("initial heartbeat failed")
+	}
+
+	// Poll loop
+	ticker := time.NewTicker(time.Duration(cfg.PollInterval) * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			job, definition, err := claimJob(client, cfg)
+			if err != nil {
+				logger.Error().Err(err).Msg("claim failed")
+				continue
+			}
+			if job == nil {
+				continue
+			}
+
+			jobID, _ := job["id"].(string)
+			defName, _ := job["definition_name"].(string)
+			logger.Info().Str("job_id", jobID).Str("definition", defName).Msg("claimed job")
+
+			// Start the job
+			if err := startJob(client, cfg, jobID); err != nil {
+				logger.Error().Err(err).Str("job_id", jobID).Msg("failed to start job")
+				continue
+			}
+
+			// Execute the job
+			executeJob(logger, client, cfg, jobID, job, definition)
+
+		case <-quit:
+			logger.Info().Msg("shutting down")
+			return
+		}
+	}
+}
+
+func loadConfig(path string) (*RunnerConfig, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config: %w", err)
+	}
+	data = []byte(os.ExpandEnv(string(data)))
+
+	var cfg RunnerConfig
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config: %w", err)
+	}
+	return &cfg, nil
+}
+
+func heartbeat(client *http.Client, cfg *RunnerConfig) error {
+	req, err := http.NewRequest("POST", cfg.ServerURL+"/api/runner/heartbeat", nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("heartbeat: %d %s", resp.StatusCode, string(body))
+	}
+	return nil
+}
+
+func claimJob(client *http.Client, cfg *RunnerConfig) (map[string]any, map[string]any, error) {
+	req, err := http.NewRequest("POST", cfg.ServerURL+"/api/runner/claim", nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNoContent {
+		return nil, nil, nil // No jobs available
+	}
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, nil, fmt.Errorf("claim: %d %s", resp.StatusCode, string(body))
+	}
+
+	var result struct {
+		Job        map[string]any `json:"job"`
+		Definition map[string]any `json:"definition"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, nil, fmt.Errorf("decoding claim response: %w", err)
+	}
+
+	return result.Job, result.Definition, nil
+}
+
+func startJob(client *http.Client, cfg *RunnerConfig, jobID string) error {
+	req, err := http.NewRequest("POST", cfg.ServerURL+"/api/runner/jobs/"+jobID+"/start", nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("start: %d %s", resp.StatusCode, string(body))
+	}
+	return nil
+}
+
+func reportProgress(client *http.Client, cfg *RunnerConfig, jobID string, progress int, message string) {
+	body, _ := json.Marshal(map[string]any{
+		"progress": progress,
+		"message":  message,
+	})
+	req, _ := http.NewRequest("PUT", cfg.ServerURL+"/api/runner/jobs/"+jobID+"/progress", bytes.NewReader(body))
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return
+	}
+	resp.Body.Close()
+}
+
+func completeJob(client *http.Client, cfg *RunnerConfig, jobID string, result map[string]any) error {
+	body, _ := json.Marshal(map[string]any{"result": result})
+	req, err := http.NewRequest("POST", cfg.ServerURL+"/api/runner/jobs/"+jobID+"/complete", bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		respBody, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("complete: %d %s", resp.StatusCode, string(respBody))
+	}
+	return nil
+}
+
+func failJob(client *http.Client, cfg *RunnerConfig, jobID string, errMsg string) {
+	body, _ := json.Marshal(map[string]string{"error": errMsg})
+	req, _ := http.NewRequest("POST", cfg.ServerURL+"/api/runner/jobs/"+jobID+"/fail", bytes.NewReader(body))
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return
+	}
+	resp.Body.Close()
+}
+
+func appendLog(client *http.Client, cfg *RunnerConfig, jobID, level, message string) {
+	body, _ := json.Marshal(map[string]string{
+		"level":   level,
+		"message": message,
+	})
+	req, _ := http.NewRequest("POST", cfg.ServerURL+"/api/runner/jobs/"+jobID+"/log", bytes.NewReader(body))
+	req.Header.Set("Authorization", "Bearer "+cfg.Token)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return
+	}
+	resp.Body.Close()
+}
+
+// executeJob dispatches the job based on its compute command.
+// For now, this is a stub that demonstrates the lifecycle.
+// Real execution will shell out to Headless Create with silo-mod.
+func executeJob(logger zerolog.Logger, client *http.Client, cfg *RunnerConfig, jobID string, job, definition map[string]any) {
+	defName, _ := job["definition_name"].(string)
+
+	// Extract compute config from definition
+	var command string
+	if definition != nil {
+		if compute, ok := definition["compute"].(map[string]any); ok {
+			command, _ = compute["command"].(string)
+		}
+	}
+
+	appendLog(client, cfg, jobID, "info", fmt.Sprintf("starting execution: %s (command: %s)", defName, command))
+	reportProgress(client, cfg, jobID, 10, "preparing")
+
+	switch command {
+	case "create-validate", "create-export", "create-dag-extract", "create-thumbnail":
+		if cfg.CreatePath == "" {
+			failJob(client, cfg, jobID, "create_path not configured")
+			return
+		}
+
+		appendLog(client, cfg, jobID, "info", fmt.Sprintf("would execute: %s --console with silo-mod", cfg.CreatePath))
+		reportProgress(client, cfg, jobID, 50, "executing")
+
+		// TODO: Actual Create execution:
+		// 1. Download item file from Silo API
+		// 2. Shell out: create --console -e "from silo.runner import <entry>; <entry>(...)"
+		// 3. Parse output JSON
+		// 4. Upload results / sync DAG
+		// For now, complete with a placeholder result.
+
+		reportProgress(client, cfg, jobID, 90, "finalizing")
+
+		if err := completeJob(client, cfg, jobID, map[string]any{
+			"status":  "placeholder",
+			"message": "Create execution not yet implemented - runner lifecycle verified",
+			"command": command,
+		}); err != nil {
+			logger.Error().Err(err).Str("job_id", jobID).Msg("failed to complete job")
+		} else {
+			logger.Info().Str("job_id", jobID).Msg("job completed (placeholder)")
+		}
+
+	default:
+		failJob(client, cfg, jobID, fmt.Sprintf("unknown compute command: %s", command))
+		logger.Warn().Str("job_id", jobID).Str("command", command).Msg("unknown compute command")
+	}
+}

config.example.yaml

@@ -17,12 +17,9 @@ database:
   max_connections: 10
 
 storage:
-  endpoint: "localhost:9000" # Use "minio:9000" for Docker Compose
+  backend: "filesystem"
-  access_key: "" # Use SILO_MINIO_ACCESS_KEY env var
+  filesystem:
-  secret_key: "" # Use SILO_MINIO_SECRET_KEY env var
+    root_dir: "/opt/silo/data" # Override with SILO_STORAGE_ROOT_DIR env var
-  bucket: "silo-files"
-  use_ssl: true # Use false for Docker Compose (internal network)
-  region: "us-east-1"
 
 schemas:
   # Directory containing YAML schema files

deployments/config.dev.yaml

@@ -17,12 +17,9 @@ database:
   max_connections: 10
 
 storage:
-  endpoint: "minio:9000"
+  backend: "filesystem"
-  access_key: "${MINIO_ACCESS_KEY:-silominio}"
+  filesystem:
-  secret_key: "${MINIO_SECRET_KEY:-silominiosecret}"
+    root_dir: "/var/lib/silo/data"
-  bucket: "silo-files"
-  use_ssl: false
-  region: "us-east-1"
 
 schemas:
   directory: "/etc/silo/schemas"

deployments/config.prod.yaml

@@ -10,8 +10,6 @@
 #
 # Credentials via environment variables (set in /etc/silo/silod.env):
 #   SILO_DB_PASSWORD
-#   SILO_MINIO_ACCESS_KEY
-#   SILO_MINIO_SECRET_KEY
 #   SILO_SESSION_SECRET
 #   SILO_ADMIN_PASSWORD
 
@@ -30,12 +28,9 @@ database:
   max_connections: 20
 
 storage:
-  endpoint: "minio.example.internal:9000"
+  backend: "filesystem"
-  access_key: "" # Set via SILO_MINIO_ACCESS_KEY
+  filesystem:
-  secret_key: "" # Set via SILO_MINIO_SECRET_KEY
+    root_dir: "/opt/silo/data"
-  bucket: "silo-files"
-  use_ssl: true
-  region: "us-east-1"
 
 schemas:
   directory: "/opt/silo/schemas"

deployments/docker-compose.allinone.yaml

@@ -1,5 +1,5 @@
 # Silo All-in-One Stack
-# PostgreSQL + MinIO + OpenLDAP + Silo API + Nginx (optional)
+# PostgreSQL + OpenLDAP + Silo API + Nginx (optional)
 #
 # Quick start:
 #   ./scripts/setup-docker.sh
@@ -40,29 +40,6 @@ services:
     networks:
       - silo-net
 
-  # ---------------------------------------------------------------------------
-  # MinIO (S3-compatible object storage)
-  # ---------------------------------------------------------------------------
-  minio:
-    image: minio/minio:latest
-    container_name: silo-minio
-    restart: unless-stopped
-    command: server /data --console-address ":9001"
-    environment:
-      MINIO_ROOT_USER: ${MINIO_ACCESS_KEY:?Run ./scripts/setup-docker.sh first}
-      MINIO_ROOT_PASSWORD: ${MINIO_SECRET_KEY:?Run ./scripts/setup-docker.sh first}
-    volumes:
-      - minio_data:/data
-    ports:
-      - "9001:9001"           # MinIO console (remove in hardened setups)
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-    networks:
-      - silo-net
-
   # ---------------------------------------------------------------------------
   # OpenLDAP (user directory for LDAP authentication)
   # ---------------------------------------------------------------------------
@@ -85,7 +62,11 @@ services:
     ports:
       - "1389:1389" # LDAP access for debugging (remove in hardened setups)
     healthcheck:
-      test: ["CMD-SHELL", "ldapsearch -x -H ldap://localhost:1389 -b dc=silo,dc=local -D cn=admin,dc=silo,dc=local -w $${LDAP_ADMIN_PASSWORD} '(objectClass=organization)' >/dev/null 2>&1"]
+      test:
+        [
+          "CMD-SHELL",
+          "ldapsearch -x -H ldap://localhost:1389 -b dc=silo,dc=local -D cn=admin,dc=silo,dc=local -w $${LDAP_ADMIN_PASSWORD} '(objectClass=organization)' >/dev/null 2>&1",
+        ]
       interval: 10s
       timeout: 5s
       retries: 5
@@ -104,8 +85,6 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
-      minio:
-        condition: service_healthy
       openldap:
         condition: service_healthy
     env_file:
@@ -117,12 +96,10 @@ services:
       SILO_DB_NAME: silo
       SILO_DB_USER: silo
       SILO_DB_PASSWORD: ${POSTGRES_PASSWORD}
-      SILO_MINIO_ENDPOINT: minio:9000
-      SILO_MINIO_ACCESS_KEY: ${MINIO_ACCESS_KEY}
-      SILO_MINIO_SECRET_KEY: ${MINIO_SECRET_KEY}
     ports:
       - "${SILO_PORT:-8080}:8080"
     volumes:
+      - silo_data:/var/lib/silo/data
       - ../schemas:/etc/silo/schemas:ro
       - ./config.docker.yaml:/etc/silo/config.yaml:ro
     healthcheck:
@@ -164,7 +141,7 @@ services:
 
 volumes:
   postgres_data:
-  minio_data:
+  silo_data:
   openldap_data:
 
 networks:

deployments/docker-compose.prod.yaml

@@ -1,10 +1,8 @@
 # Production Docker Compose for Silo
-# Uses external PostgreSQL (psql.example.internal) and MinIO (minio.example.internal)
+# Uses external PostgreSQL (psql.example.internal) and filesystem storage
 #
 # Usage:
 #   export SILO_DB_PASSWORD=<your-password>
-#   export SILO_MINIO_ACCESS_KEY=<your-access-key>
-#   export SILO_MINIO_SECRET_KEY=<your-secret-key>
 #   docker compose -f docker-compose.prod.yaml up -d
 
 services:
@@ -24,14 +22,6 @@ services:
       # Note: SILO_DB_PORT and SILO_DB_SSLMODE are NOT supported as direct
       # env var overrides. Set these in config.yaml instead, or use ${VAR}
       # syntax in the YAML file. See docs/CONFIGURATION.md for details.
-
-      # MinIO storage (minio.example.internal)
-      # Supported as direct env var overrides:
-      SILO_MINIO_ENDPOINT: minio.example.internal:9000
-      SILO_MINIO_ACCESS_KEY: ${SILO_MINIO_ACCESS_KEY:?MinIO access key required}
-      SILO_MINIO_SECRET_KEY: ${SILO_MINIO_SECRET_KEY:?MinIO secret key required}
-      # Note: SILO_MINIO_BUCKET and SILO_MINIO_USE_SSL are NOT supported as
-      # direct env var overrides. Set these in config.yaml instead.
     ports:
       - "8080:8080"
     volumes:

deployments/docker-compose.yaml

@@ -19,26 +19,6 @@ services:
     networks:
       - silo-network
 
-  minio:
-    image: minio/minio:RELEASE.2023-05-04T21-44-30Z
-    container_name: silo-minio
-    command: server /data --console-address ":9001"
-    environment:
-      MINIO_ROOT_USER: ${MINIO_ACCESS_KEY:-silominio}
-      MINIO_ROOT_PASSWORD: ${MINIO_SECRET_KEY:-silominiosecret}
-    volumes:
-      - minio_data:/data
-    ports:
-      - "9000:9000"
-      - "9001:9001"
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-    networks:
-      - silo-network
-
   silo:
     build:
       context: ..
@@ -47,19 +27,12 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
-      minio:
-        condition: service_healthy
     environment:
       SILO_DB_HOST: postgres
       SILO_DB_PORT: 5432
       SILO_DB_NAME: silo
       SILO_DB_USER: silo
       SILO_DB_PASSWORD: ${POSTGRES_PASSWORD:-silodev}
-      SILO_MINIO_ENDPOINT: minio:9000
-      SILO_MINIO_ACCESS_KEY: ${MINIO_ACCESS_KEY:-silominio}
-      SILO_MINIO_SECRET_KEY: ${MINIO_SECRET_KEY:-silominiosecret}
-      SILO_MINIO_BUCKET: silo-files
-      SILO_MINIO_USE_SSL: "false"
       SILO_SESSION_SECRET: ${SILO_SESSION_SECRET:-change-me-in-production}
       SILO_OIDC_CLIENT_SECRET: ${SILO_OIDC_CLIENT_SECRET:-}
       SILO_LDAP_BIND_PASSWORD: ${SILO_LDAP_BIND_PASSWORD:-}
@@ -68,6 +41,7 @@ services:
     ports:
       - "8080:8080"
     volumes:
+      - silo_data:/var/lib/silo/data
       - ../schemas:/etc/silo/schemas:ro
       - ./config.dev.yaml:/etc/silo/config.yaml:ro
     healthcheck:
@@ -80,7 +54,7 @@ services:
 
 volumes:
   postgres_data:
-  minio_data:
+  silo_data:
 
 networks:
   silo-network:

deployments/systemd/silod.env.example

@@ -6,10 +6,6 @@
 # Database: silo, User: silo
 SILO_DB_PASSWORD=
 
-# MinIO credentials (minio.example.internal)
-# User: silouser
-SILO_MINIO_ACCESS_KEY=silouser
-SILO_MINIO_SECRET_KEY=
 
 # Authentication
 # Session secret (required when auth is enabled)

deployments/systemd/silod.service

@@ -27,6 +27,7 @@ NoNewPrivileges=yes
 ProtectSystem=strict
 ProtectHome=yes
 PrivateTmp=yes
+ReadWritePaths=/opt/silo/data
 ReadOnlyPaths=/etc/silo /opt/silo
 
 # Resource limits

docs/CONFIGURATION.md

@@ -1,6 +1,6 @@
 # Configuration Reference
 
-**Last Updated:** 2026-02-06
+**Last Updated:** 2026-03-01
 
 ---
 
@@ -73,25 +73,27 @@ database:
 
 ---
 
-## Storage (MinIO/S3)
+## Storage (Filesystem)
 
-| Key | Type | Default | Env Override | Description |
+Files are stored on the local filesystem under a configurable root directory.
-|-----|------|---------|-------------|-------------|
+
-| `storage.endpoint` | string | — | `SILO_MINIO_ENDPOINT` | MinIO/S3 endpoint (`host:port`) |
+| Key | Type | Default | Description |
-| `storage.access_key` | string | — | `SILO_MINIO_ACCESS_KEY` | Access key |
+|-----|------|---------|-------------|
-| `storage.secret_key` | string | — | `SILO_MINIO_SECRET_KEY` | Secret key |
+| `storage.backend` | string | `"filesystem"` | Storage backend (`filesystem`) |
-| `storage.bucket` | string | — | — | S3 bucket name (created automatically if missing) |
+| `storage.filesystem.root_dir` | string | — | Root directory for file storage (required) |
-| `storage.use_ssl` | bool | `false` | — | Use HTTPS for MinIO connections |
-| `storage.region` | string | `"us-east-1"` | — | S3 region |
 
 ```yaml
 storage:
-  endpoint: "localhost:9000"
+  backend: "filesystem"
-  access_key: ""  # use SILO_MINIO_ACCESS_KEY env var
+  filesystem:
-  secret_key: ""  # use SILO_MINIO_SECRET_KEY env var
+    root_dir: "/opt/silo/data"
-  bucket: "silo-files"
+```
-  use_ssl: false
+
-  region: "us-east-1"
+Ensure the directory exists and is writable by the `silo` user:
+
+```bash
+sudo mkdir -p /opt/silo/data
+sudo chown silo:silo /opt/silo/data
 ```
 
 ---
@@ -151,6 +153,70 @@ odoo:
 
 ---
 
+## Approval Workflows
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| `workflows.directory` | string | `"/etc/silo/workflows"` | Path to directory containing YAML workflow definition files |
+
+Workflow definition files describe multi-stage approval processes using a state machine pattern. Each file defines a workflow with states, transitions, and approver requirements.
+
+```yaml
+workflows:
+  directory: "/etc/silo/workflows"
+```
+
+---
+
+## Solver
+
+| Key | Type | Default | Env Override | Description |
+|-----|------|---------|-------------|-------------|
+| `solver.default_solver` | string | `""` | `SILO_SOLVER_DEFAULT` | Default solver backend name |
+| `solver.max_context_size_mb` | int | `10` | — | Maximum SolveContext payload size in MB |
+| `solver.default_timeout` | int | `300` | — | Default solver job timeout in seconds |
+| `solver.auto_diagnose_on_commit` | bool | `false` | — | Auto-submit diagnose job on assembly revision commit |
+
+The solver module depends on the `jobs` module being enabled. See [SOLVER.md](SOLVER.md) for the full solver service specification.
+
+```yaml
+solver:
+  default_solver: "ondsel"
+  max_context_size_mb: 10
+  default_timeout: 300
+  auto_diagnose_on_commit: true
+```
+
+---
+
+## Modules
+
+Optional module toggles. Each module can be explicitly enabled or disabled. If not listed, the module's built-in default applies. See [MODULES.md](MODULES.md) for the full module system specification.
+
+```yaml
+modules:
+  projects:
+    enabled: true
+  audit:
+    enabled: true
+  odoo:
+    enabled: false
+  freecad:
+    enabled: true
+  jobs:
+    enabled: false
+  dag:
+    enabled: false
+  solver:
+    enabled: false
+  sessions:
+    enabled: true
+```
+
+The `auth.enabled` field controls the `auth` module directly (not duplicated under `modules:`). The `sessions` module depends on `auth` and is enabled by default.
+
+---
+
 ## Authentication
 
 Authentication has a master toggle and three independent backends. When `auth.enabled` is `false`, all routes are accessible without login and a synthetic admin user (`dev`) is injected into every request.
@@ -264,14 +330,12 @@ All environment variable overrides. These take precedence over values in `config
 | `SILO_DB_NAME` | `database.name` | PostgreSQL database name |
 | `SILO_DB_USER` | `database.user` | PostgreSQL user |
 | `SILO_DB_PASSWORD` | `database.password` | PostgreSQL password |
-| `SILO_MINIO_ENDPOINT` | `storage.endpoint` | MinIO endpoint |
-| `SILO_MINIO_ACCESS_KEY` | `storage.access_key` | MinIO access key |
-| `SILO_MINIO_SECRET_KEY` | `storage.secret_key` | MinIO secret key |
 | `SILO_SESSION_SECRET` | `auth.session_secret` | Session cookie signing secret |
 | `SILO_ADMIN_USERNAME` | `auth.local.default_admin_username` | Default admin username |
 | `SILO_ADMIN_PASSWORD` | `auth.local.default_admin_password` | Default admin password |
 | `SILO_LDAP_BIND_PASSWORD` | `auth.ldap.bind_password` | LDAP service account password |
 | `SILO_OIDC_CLIENT_SECRET` | `auth.oidc.client_secret` | OIDC client secret |
+| `SILO_SOLVER_DEFAULT` | `solver.default_solver` | Default solver backend name |
 
 Additionally, YAML values can reference environment variables directly using `${VAR_NAME}` syntax, which is expanded at load time via `os.ExpandEnv()`.
 
@@ -296,11 +360,9 @@ database:
   sslmode: "disable"
 
 storage:
-  endpoint: "localhost:9000"
+  backend: "filesystem"
-  access_key: "minioadmin"
+  filesystem:
-  secret_key: "minioadmin"
+    root_dir: "./data"
-  bucket: "silo-files"
-  use_ssl: false
 
 schemas:
   directory: "./schemas"

docs/DAG.md

@@ -0,0 +1,246 @@
+# Dependency DAG Specification
+
+**Status:** Draft
+**Last Updated:** 2026-02-13
+
+---
+
+## 1. Purpose
+
+The Dependency DAG is a server-side graph that tracks how features, constraints, and assembly relationships depend on each other. It enables three capabilities described in [MULTI_USER_EDITS.md](MULTI_USER_EDITS.md):
+
+1. **Interference detection** -- comparing dependency cones of concurrent edit sessions to classify conflicts as none, soft, or hard before the user encounters them.
+2. **Incremental validation** -- marking changed nodes dirty and propagating only through the affected subgraph, using input-hash memoization to stop early when inputs haven't changed.
+3. **Structured merge safety** -- walking the DAG to determine whether concurrent edits share upstream dependencies, deciding if auto-merge is safe or manual review is required.
+
+---
+
+## 2. Two-Tier Model
+
+Silo maintains two levels of dependency graph:
+
+### 2.1 BOM DAG (existing)
+
+The assembly-to-part relationship graph already stored in the `relationships` table. Each row represents a parent item containing a child item with a quantity and relationship type (`component`, `alternate`, `reference`). This graph is queried via `GetBOM`, `GetExpandedBOM`, `GetWhereUsed`, and `HasCycle` in `internal/db/relationships.go`.
+
+The BOM DAG is **not modified** by this specification. It continues to serve its existing purpose.
+
+### 2.2 Feature DAG (new)
+
+A finer-grained graph stored in `dag_nodes` and `dag_edges` tables. Each node represents a feature within a single item's revision -- a sketch, pad, fillet, pocket, constraint, body, or part-level container. Edges represent "depends on" relationships: if Pad003 depends on Sketch001, an edge runs from Sketch001 to Pad003.
+
+The feature DAG is populated by clients (silo-mod) when users save, or by runners after compute jobs. Silo stores and queries it but does not generate it -- the Create client has access to the feature tree and is the authoritative source.
+
+### 2.3 Cross-Item Edges
+
+Assembly constraints often reference geometry on child parts (e.g., "mate Face6 of PartA to Face2 of PartB"). These cross-item dependencies are stored in `dag_cross_edges`, linking a node in one item to a node in another. Each cross-edge optionally references the `relationships` row that establishes the BOM connection.
+
+---
+
+## 3. Data Model
+
+### 3.1 dag_nodes
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `item_id` | UUID | FK to `items.id` |
+| `revision_number` | INTEGER | Revision this DAG snapshot belongs to |
+| `node_key` | TEXT | Feature name from Create (e.g., `Sketch001`, `Pad003`, `Body`) |
+| `node_type` | TEXT | One of: `sketch`, `pad`, `pocket`, `fillet`, `chamfer`, `constraint`, `body`, `part`, `datum`, `mirror`, `pattern`, `boolean` |
+| `properties_hash` | TEXT | SHA-256 of the node's parametric inputs (sketch coordinates, fillet radius, constraint values). Used for memoization -- if the hash hasn't changed, validation can skip this node. |
+| `validation_state` | TEXT | One of: `clean`, `dirty`, `validating`, `failed` |
+| `validation_msg` | TEXT | Error message when `validation_state = 'failed'` |
+| `metadata` | JSONB | Type-specific data (sketch coords, feature params, constraint definitions) |
+| `created_at` | TIMESTAMPTZ | Row creation time |
+| `updated_at` | TIMESTAMPTZ | Last state change |
+
+**Uniqueness:** `(item_id, revision_number, node_key)` -- one node per feature per revision.
+
+### 3.2 dag_edges
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `source_node_id` | UUID | FK to `dag_nodes.id` -- the upstream node |
+| `target_node_id` | UUID | FK to `dag_nodes.id` -- the downstream node that depends on source |
+| `edge_type` | TEXT | `depends_on` (default), `references`, `constrains` |
+| `metadata` | JSONB | Optional edge metadata |
+
+**Direction convention:** An edge from A to B means "B depends on A". A is upstream, B is downstream. Forward-cone traversal from A walks edges where A is the source.
+
+**Uniqueness:** `(source_node_id, target_node_id, edge_type)`.
+
+**Constraint:** `source_node_id != target_node_id` (no self-edges).
+
+### 3.3 dag_cross_edges
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | UUID | Primary key |
+| `source_node_id` | UUID | FK to `dag_nodes.id` -- node in item A |
+| `target_node_id` | UUID | FK to `dag_nodes.id` -- node in item B |
+| `relationship_id` | UUID | FK to `relationships.id` (nullable) -- the BOM entry connecting the two items |
+| `edge_type` | TEXT | `assembly_ref` (default) |
+| `metadata` | JSONB | Reference details (face ID, edge ID, etc.) |
+
+**Uniqueness:** `(source_node_id, target_node_id)`.
+
+---
+
+## 4. Validation States
+
+Each node has a `validation_state` that tracks whether its computed geometry is current:
+
+| State | Meaning |
+|-------|---------|
+| `clean` | Node's geometry matches its `properties_hash`. No recompute needed. |
+| `dirty` | An upstream change has propagated to this node. Recompute required. |
+| `validating` | A compute job is currently revalidating this node. |
+| `failed` | Recompute failed. `validation_msg` contains the error. |
+
+### 4.1 State Transitions
+
+```
+clean → dirty       (upstream change detected, or MarkDirty called)
+dirty → validating  (compute job claims this node)
+validating → clean  (recompute succeeded, properties_hash updated)
+validating → failed (recompute produced an error)
+failed → dirty      (upstream change detected, retry possible)
+dirty → clean       (properties_hash matches previous -- memoization shortcut)
+```
+
+### 4.2 Dirty Propagation
+
+When a node is marked dirty, all downstream nodes in its forward cone are also marked dirty. This is done atomically in a single recursive CTE:
+
+```sql
+WITH RECURSIVE forward_cone AS (
+    SELECT $1::uuid AS node_id
+    UNION
+    SELECT e.target_node_id
+    FROM dag_edges e
+    JOIN forward_cone fc ON fc.node_id = e.source_node_id
+)
+UPDATE dag_nodes SET validation_state = 'dirty', updated_at = now()
+WHERE id IN (SELECT node_id FROM forward_cone)
+  AND validation_state = 'clean';
+```
+
+### 4.3 Memoization
+
+Before marking a node dirty, the system can compare the new `properties_hash` against the stored value. If they match, the change did not affect this node's inputs, and propagation stops. This is the memoization boundary described in MULTI_USER_EDITS.md Section 5.2.
+
+---
+
+## 5. Graph Queries
+
+### 5.1 Forward Cone
+
+Returns all nodes downstream of a given node -- everything that would be affected if the source node changes. Used for interference detection: if two users' forward cones overlap, there is potential interference.
+
+```sql
+WITH RECURSIVE forward_cone AS (
+    SELECT target_node_id AS node_id
+    FROM dag_edges WHERE source_node_id = $1
+    UNION
+    SELECT e.target_node_id
+    FROM dag_edges e
+    JOIN forward_cone fc ON fc.node_id = e.source_node_id
+)
+SELECT n.* FROM dag_nodes n JOIN forward_cone fc ON n.id = fc.node_id;
+```
+
+### 5.2 Backward Cone
+
+Returns all nodes upstream of a given node -- everything the target node depends on.
+
+### 5.3 Dirty Subgraph
+
+Returns all nodes for a given item where `validation_state != 'clean'`, along with their edges. This is the input to an incremental validation job.
+
+### 5.4 Cycle Detection
+
+Before adding an edge, check that it would not create a cycle. Uses the same recursive ancestor-walk pattern as `HasCycle` in `internal/db/relationships.go`.
+
+---
+
+## 6. DAG Sync
+
+Clients push the full feature DAG to Silo via `PUT /api/items/{partNumber}/dag`. The sync payload is a JSON document:
+
+```json
+{
+  "revision": 3,
+  "nodes": [
+    {
+      "key": "Sketch001",
+      "type": "sketch",
+      "properties_hash": "a1b2c3...",
+      "metadata": {
+        "coordinates": [[0, 0], [10, 0], [10, 5]],
+        "constraints": ["horizontal", "vertical"]
+      }
+    },
+    {
+      "key": "Pad003",
+      "type": "pad",
+      "properties_hash": "d4e5f6...",
+      "metadata": {
+        "length": 15.0,
+        "direction": [0, 0, 1]
+      }
+    }
+  ],
+  "edges": [
+    {
+      "source": "Sketch001",
+      "target": "Pad003",
+      "type": "depends_on"
+    }
+  ]
+}
+```
+
+The server processes this within a single transaction:
+1. Upsert all nodes (matched by `item_id + revision_number + node_key`).
+2. Replace all edges for this item/revision.
+3. Compare new `properties_hash` values against stored values to detect changes.
+4. Mark changed nodes and their forward cones dirty.
+5. Publish `dag.updated` SSE event.
+
+---
+
+## 7. Interference Detection
+
+When a user registers an edit context (MULTI_USER_EDITS.md Section 3.1), the server:
+
+1. Looks up the node(s) being edited by `node_key` within the item's current revision.
+2. Computes the forward cone for those nodes.
+3. Compares the cone against all active edit sessions' cones.
+4. Classifies interference:
+   - **No overlap** → no interference, fully concurrent.
+   - **Overlap, different objects** → soft interference, visual indicator via SSE.
+   - **Same object, same edit type** → hard interference, edit blocked.
+
+---
+
+## 8. REST API
+
+All endpoints are under `/api/items/{partNumber}` and require authentication.
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/dag` | viewer | Get full feature DAG for current revision |
+| `GET` | `/dag/forward-cone/{nodeKey}` | viewer | Get forward dependency cone |
+| `GET` | `/dag/dirty` | viewer | Get dirty subgraph |
+| `PUT` | `/dag` | editor | Sync full feature tree (from client or runner) |
+| `POST` | `/dag/mark-dirty/{nodeKey}` | editor | Manually mark a node and its cone dirty |
+
+---
+
+## 9. References
+
+- [MULTI_USER_EDITS.md](MULTI_USER_EDITS.md) -- Full multi-user editing specification
+- [WORKERS.md](WORKERS.md) -- Worker/runner system that executes validation jobs
+- [ROADMAP.md](ROADMAP.md) -- Tier 0 Dependency DAG entry

docs/DAG_CLIENT_INTEGRATION.md

@@ -0,0 +1,395 @@
+# DAG Client Integration Contract
+
+**Status:** Draft
+**Last Updated:** 2026-02-13
+
+This document describes what silo-mod and Headless Create runners need to implement to integrate with the Silo dependency DAG and worker system.
+
+---
+
+## 1. Overview
+
+The DAG system has two client-side integration points:
+
+1. **silo-mod workbench** (desktop) -- pushes DAG data to Silo on save or revision create.
+2. **silorunner + silo-mod** (headless) -- extracts DAGs, validates features, and exports geometry as compute jobs.
+
+Both share the same Python codebase in the silo-mod repository. Desktop users call the code interactively; runners call it headlessly via `create --console`.
+
+---
+
+## 2. DAG Sync Payload
+
+Clients push feature trees to Silo via:
+
+```
+PUT /api/items/{partNumber}/dag
+Authorization: Bearer <user_token or runner_token>
+Content-Type: application/json
+```
+
+### 2.1 Request Body
+
+```json
+{
+  "revision_number": 3,
+  "nodes": [
+    {
+      "node_key": "Sketch001",
+      "node_type": "sketch",
+      "properties_hash": "a1b2c3d4e5f6...",
+      "metadata": {
+        "label": "Base Profile",
+        "constraint_count": 12
+      }
+    },
+    {
+      "node_key": "Pad001",
+      "node_type": "pad",
+      "properties_hash": "f6e5d4c3b2a1...",
+      "metadata": {
+        "label": "Main Extrusion",
+        "length": 25.0
+      }
+    }
+  ],
+  "edges": [
+    {
+      "source_key": "Sketch001",
+      "target_key": "Pad001",
+      "edge_type": "depends_on"
+    }
+  ]
+}
+```
+
+### 2.2 Field Reference
+
+**Nodes:**
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `node_key` | string | yes | Unique within item+revision. Use Create's internal object name (e.g. `Sketch001`, `Pad003`). |
+| `node_type` | string | yes | One of: `sketch`, `pad`, `pocket`, `fillet`, `chamfer`, `constraint`, `body`, `part`, `datum`. |
+| `properties_hash` | string | no | SHA-256 hex digest of the node's parametric inputs. Used for memoization. |
+| `validation_state` | string | no | One of: `clean`, `dirty`, `validating`, `failed`. Defaults to `clean`. |
+| `metadata` | object | no | Arbitrary key-value pairs for display or debugging. |
+
+**Edges:**
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `source_key` | string | yes | The node that is depended upon. |
+| `target_key` | string | yes | The node that depends on the source. |
+| `edge_type` | string | no | One of: `depends_on` (default), `references`, `constrains`. |
+
+**Direction convention:** Edges point from dependency to dependent. If Pad001 depends on Sketch001, the edge is `source_key: "Sketch001"`, `target_key: "Pad001"`.
+
+### 2.3 Response
+
+```json
+{
+  "synced": true,
+  "node_count": 15,
+  "edge_count": 14
+}
+```
+
+---
+
+## 3. Computing properties_hash
+
+The `properties_hash` enables memoization -- if a node's inputs haven't changed since the last validation, it can be skipped. Computing it:
+
+```python
+import hashlib
+import json
+
+def compute_properties_hash(feature_obj):
+    """Hash the parametric inputs of a Create feature."""
+    inputs = {}
+
+    if feature_obj.TypeId == "Sketcher::SketchObject":
+        # Hash geometry + constraints
+        inputs["geometry_count"] = feature_obj.GeometryCount
+        inputs["constraint_count"] = feature_obj.ConstraintCount
+        inputs["geometry"] = str(feature_obj.Shape.exportBrep())
+    elif feature_obj.TypeId == "PartDesign::Pad":
+        inputs["length"] = feature_obj.Length.Value
+        inputs["type"] = str(feature_obj.Type)
+        inputs["reversed"] = feature_obj.Reversed
+        inputs["sketch"] = feature_obj.Profile[0].Name
+    # ... other feature types
+
+    canonical = json.dumps(inputs, sort_keys=True)
+    return hashlib.sha256(canonical.encode()).hexdigest()
+```
+
+The exact inputs per feature type are determined by what parametric values affect the feature's geometry. Include anything that, if changed, would require recomputation.
+
+---
+
+## 4. Feature Tree Walking
+
+To extract the DAG from a Create document:
+
+```python
+import FreeCAD
+
+def extract_dag(doc):
+    """Walk a Create document and return nodes + edges."""
+    nodes = []
+    edges = []
+
+    for obj in doc.Objects:
+        # Skip non-feature objects
+        if not hasattr(obj, "TypeId"):
+            continue
+
+        node_type = classify_type(obj.TypeId)
+        if node_type is None:
+            continue
+
+        nodes.append({
+            "node_key": obj.Name,
+            "node_type": node_type,
+            "properties_hash": compute_properties_hash(obj),
+            "metadata": {
+                "label": obj.Label,
+                "type_id": obj.TypeId,
+            }
+        })
+
+        # Walk dependencies via InList (objects this one depends on)
+        for dep in obj.InList:
+            if hasattr(dep, "TypeId") and classify_type(dep.TypeId):
+                edges.append({
+                    "source_key": dep.Name,
+                    "target_key": obj.Name,
+                    "edge_type": "depends_on",
+                })
+
+    return nodes, edges
+
+
+def classify_type(type_id):
+    """Map Create TypeIds to DAG node types."""
+    mapping = {
+        "Sketcher::SketchObject": "sketch",
+        "PartDesign::Pad": "pad",
+        "PartDesign::Pocket": "pocket",
+        "PartDesign::Fillet": "fillet",
+        "PartDesign::Chamfer": "chamfer",
+        "PartDesign::Body": "body",
+        "Part::Feature": "part",
+        "Sketcher::SketchConstraint": "constraint",
+    }
+    return mapping.get(type_id)
+```
+
+---
+
+## 5. When to Push DAG Data
+
+Push the DAG to Silo in these scenarios:
+
+| Event | Trigger | Who |
+|-------|---------|-----|
+| User saves in silo-mod | On save callback | Desktop silo-mod workbench |
+| User creates a revision | After `POST /api/items/{pn}/revisions` succeeds | Desktop silo-mod workbench |
+| Runner extracts DAG | After `create-dag-extract` job completes | silorunner via `PUT /api/runner/jobs/{id}/dag` |
+| Runner validates | After `create-validate` job, push updated validation states | silorunner via `PUT /api/runner/jobs/{id}/dag` |
+
+---
+
+## 6. Runner Entry Points
+
+silo-mod must provide these Python entry points for headless invocation:
+
+### 6.1 silo.runner.dag_extract
+
+Extracts the feature DAG from a Create file and writes it as JSON.
+
+```python
+# silo/runner.py
+
+def dag_extract(input_path, output_path):
+    """
+    Extract feature DAG from a Create file.
+
+    Args:
+        input_path: Path to the .kc (Kindred Create) file.
+        output_path: Path to write the JSON output.
+
+    Output JSON format:
+    {
+        "nodes": [...],  // Same format as DAG sync payload
+        "edges": [...]
+    }
+    """
+    doc = FreeCAD.openDocument(input_path)
+    nodes, edges = extract_dag(doc)
+
+    with open(output_path, 'w') as f:
+        json.dump({"nodes": nodes, "edges": edges}, f)
+
+    FreeCAD.closeDocument(doc.Name)
+```
+
+### 6.2 silo.runner.validate
+
+Rebuilds all features and reports pass/fail per node.
+
+```python
+def validate(input_path, output_path):
+    """
+    Validate a Create file by rebuilding all features.
+
+    Output JSON format:
+    {
+        "valid": true/false,
+        "nodes": [
+            {
+                "node_key": "Pad001",
+                "state": "clean",       // or "failed"
+                "message": null,        // error message if failed
+                "properties_hash": "..."
+            }
+        ]
+    }
+    """
+    doc = FreeCAD.openDocument(input_path)
+    doc.recompute()
+
+    results = []
+    all_valid = True
+    for obj in doc.Objects:
+        if not hasattr(obj, "TypeId"):
+            continue
+        node_type = classify_type(obj.TypeId)
+        if node_type is None:
+            continue
+
+        state = "clean"
+        message = None
+        if hasattr(obj, "isValid") and not obj.isValid():
+            state = "failed"
+            message = f"Feature {obj.Label} failed to recompute"
+            all_valid = False
+
+        results.append({
+            "node_key": obj.Name,
+            "state": state,
+            "message": message,
+            "properties_hash": compute_properties_hash(obj),
+        })
+
+    with open(output_path, 'w') as f:
+        json.dump({"valid": all_valid, "nodes": results}, f)
+
+    FreeCAD.closeDocument(doc.Name)
+```
+
+### 6.3 silo.runner.export
+
+Exports geometry to STEP, IGES, or other formats.
+
+```python
+def export(input_path, output_path, format="step"):
+    """
+    Export a Create file to an external format.
+
+    Args:
+        input_path: Path to the .kc file.
+        output_path: Path to write the exported file.
+        format: Export format ("step", "iges", "stl", "obj").
+    """
+    doc = FreeCAD.openDocument(input_path)
+
+    import Part
+    shapes = [obj.Shape for obj in doc.Objects if hasattr(obj, "Shape")]
+    compound = Part.makeCompound(shapes)
+
+    format_map = {
+        "step": "STEP",
+        "iges": "IGES",
+        "stl": "STL",
+        "obj": "OBJ",
+    }
+
+    Part.export([compound], output_path)
+    FreeCAD.closeDocument(doc.Name)
+```
+
+---
+
+## 7. Headless Invocation
+
+The `silorunner` binary shells out to Create (with silo-mod installed):
+
+```bash
+# DAG extraction
+create --console -e "from silo.runner import dag_extract; dag_extract('/tmp/job/part.kc', '/tmp/job/dag.json')"
+
+# Validation
+create --console -e "from silo.runner import validate; validate('/tmp/job/part.kc', '/tmp/job/result.json')"
+
+# Export
+create --console -e "from silo.runner import export; export('/tmp/job/part.kc', '/tmp/job/output.step', 'step')"
+```
+
+**Prerequisites:** The runner host must have:
+- Headless Create installed (Kindred's fork of FreeCAD)
+- silo-mod installed as a Create addon (so `from silo.runner import ...` works)
+- No display server required -- `--console` mode is headless
+
+---
+
+## 8. Validation Result Handling
+
+After a runner completes a `create-validate` job, it should:
+
+1. Read the result JSON.
+2. Push updated validation states via `PUT /api/runner/jobs/{jobID}/dag`:
+
+```json
+{
+  "revision_number": 3,
+  "nodes": [
+    {"node_key": "Sketch001", "node_type": "sketch", "validation_state": "clean", "properties_hash": "abc..."},
+    {"node_key": "Pad001", "node_type": "pad", "validation_state": "failed", "properties_hash": "def..."}
+  ],
+  "edges": [
+    {"source_key": "Sketch001", "target_key": "Pad001"}
+  ]
+}
+```
+
+3. Complete the job via `POST /api/runner/jobs/{jobID}/complete` with the summary result.
+
+---
+
+## 9. SSE Events
+
+Clients should listen for these events on `GET /api/events`:
+
+| Event | Payload | When |
+|-------|---------|------|
+| `dag.updated` | `{item_id, part_number, revision_number, node_count, edge_count}` | After any DAG sync |
+| `dag.validated` | `{item_id, part_number, valid, failed_count}` | After validation completes |
+| `job.created` | `{job_id, definition_name, trigger, item_id}` | Job auto-triggered or manually created |
+| `job.claimed` | `{job_id, runner_id, runner}` | Runner claims a job |
+| `job.progress` | `{job_id, progress, message}` | Runner reports progress |
+| `job.completed` | `{job_id, runner_id}` | Job finishes successfully |
+| `job.failed` | `{job_id, runner_id, error}` | Job fails |
+| `job.cancelled` | `{job_id, cancelled_by}` | Job cancelled by user |
+
+---
+
+## 10. Cross-Item Edges
+
+For assembly constraints that reference geometry in child parts (e.g. a mate constraint between two parts), use the `dag_cross_edges` table. These edges bridge the BOM DAG and the feature DAG.
+
+Cross-item edges are **not** included in the standard `PUT /dag` sync. They will be managed through a dedicated endpoint in a future iteration once the assembly constraint model in Create/silo-mod is finalized.
+
+For now, the DAG sync covers intra-item dependencies only. Assembly-level interference detection uses the BOM DAG (`relationships` table) combined with per-item feature DAGs.

docs/DEPLOYMENT.md

@@ -4,7 +4,7 @@
 > instructions. This document covers ongoing maintenance and operations for an
 > existing deployment.
 
-This guide covers deploying Silo to a dedicated VM using external PostgreSQL and MinIO services.
+This guide covers deploying Silo to a dedicated VM using external PostgreSQL and local filesystem storage.
 
 ## Table of Contents
 
@@ -26,28 +26,25 @@ This guide covers deploying Silo to a dedicated VM using external PostgreSQL and
 │  │                        silod                               │ │
 │  │                   (Silo API Server)                        │ │
 │  │                      :8080                                 │ │
+│  │              Files: /opt/silo/data                         │ │
 │  └───────────────────────────────────────────────────────────┘ │
 └─────────────────────────────────────────────────────────────────┘
-              │                               │
+              │
-              ▼                               ▼
+              ▼
-┌─────────────────────────┐     ┌─────────────────────────────────┐
+┌─────────────────────────┐
-│  psql.example.internal  │     │    minio.example.internal       │
+│  psql.example.internal  │
-│      PostgreSQL 16      │     │         MinIO S3                │
+│      PostgreSQL 16      │
-│        :5432            │     │       :9000 (API)               │
+│        :5432            │
-│                         │     │       :9001 (Console)           │
+└─────────────────────────┘
-└─────────────────────────┘     └─────────────────────────────────┘
 ```
 
 ## External Services
 
-The following external services are already configured:
+| Service | Host | Database | User |
-
+|---------|------|----------|------|
-| Service | Host | Database/Bucket | User |
-|---------|------|-----------------|------|
 | PostgreSQL | psql.example.internal:5432 | silo | silo |
-| MinIO | minio.example.internal:9000 | silo-files | silouser |
 
-Migrations have been applied to the database.
+Files are stored on the local filesystem at `/opt/silo/data`. Migrations have been applied to the database.
 
 ---
 
@@ -107,21 +104,15 @@ Fill in the values:
 # Database credentials (psql.example.internal)
 SILO_DB_PASSWORD=your-database-password
 
-# MinIO credentials (minio.example.internal)
+
-SILO_MINIO_ACCESS_KEY=silouser
-SILO_MINIO_SECRET_KEY=your-minio-secret-key
 ```
 
 ### Verify External Services
 
-Before deploying, verify connectivity to external services:
+Before deploying, verify connectivity to PostgreSQL:
 
 ```bash
-# Test PostgreSQL
 psql -h psql.example.internal -U silo -d silo -c 'SELECT 1'
-
-# Test MinIO
-curl -I http://minio.example.internal:9000/minio/health/live
 ```
 
 ---
@@ -183,6 +174,7 @@ sudo -E /opt/silo/src/scripts/deploy.sh
 | File | Purpose |
 |------|---------|
 | `/opt/silo/bin/silod` | Server binary |
+| `/opt/silo/data/` | File storage root |
 | `/opt/silo/src/` | Git repository checkout |
 | `/etc/silo/config.yaml` | Server configuration |
 | `/etc/silo/silod.env` | Environment variables (secrets) |
@@ -242,7 +234,7 @@ sudo journalctl -u silod --since "2024-01-15 10:00:00"
 # Basic health check
 curl http://localhost:8080/health
 
-# Full readiness check (includes DB and MinIO)
+# Full readiness check (includes DB)
 curl http://localhost:8080/ready
 ```
 
@@ -318,24 +310,6 @@ psql -h psql.example.internal -U silo -d silo -f /opt/silo/src/migrations/008_ne
 
 3. Check `pg_hba.conf` on PostgreSQL server allows connections from this host.
 
-### Connection Refused to MinIO
-
-1. Test network connectivity:
-   ```bash
-   nc -zv minio.example.internal 9000
-   ```
-
-2. Test with curl:
-   ```bash
-   curl -I http://minio.example.internal:9000/minio/health/live
-   ```
-
-3. Check SSL settings in config match MinIO setup:
-   ```yaml
-   storage:
-     use_ssl: true  # or false
-   ```
-
 ### Health Check Fails
 
 ```bash
@@ -345,7 +319,9 @@ curl -v http://localhost:8080/ready
 
 # If ready fails but health passes, check external services
 psql -h psql.example.internal -U silo -d silo -c 'SELECT 1'
-curl http://minio.example.internal:9000/minio/health/live
+
+# Check file storage directory
+ls -la /opt/silo/data
 ```
 
 ### Build Fails
@@ -460,10 +436,9 @@ sudo systemctl reload nginx
 
 - [ ] `/etc/silo/silod.env` has mode 600 (`chmod 600`)
 - [ ] Database password is strong and unique
-- [ ] MinIO credentials are specific to silo (not admin)
 - [ ] SSL/TLS enabled for PostgreSQL (`sslmode: require`)
-- [ ] SSL/TLS enabled for MinIO (`use_ssl: true`) if available
 - [ ] HTTPS enabled via nginx reverse proxy
+- [ ] File storage directory (`/opt/silo/data`) owned by `silo` user with mode 750
 - [ ] Silod listens on localhost only (`host: 127.0.0.1`)
 - [ ] Firewall allows only ports 80, 443 (not 8080)
 - [ ] Service runs as non-root `silo` user

docs/GAP_ANALYSIS.md

@@ -1,6 +1,6 @@
 # Silo Gap Analysis
 
-**Date:** 2026-02-13  
+**Date:** 2026-03-01  
 **Status:** Analysis Complete (Updated)
 
 ---
@@ -76,7 +76,7 @@ See [ROADMAP.md](ROADMAP.md) for the platform roadmap and dependency tier struct
 | Append-only revision history | Complete | `internal/db/items.go` |
 | Sequential revision numbering | Complete | Database trigger |
 | Property snapshots (JSONB) | Complete | `revisions.properties` |
-| File versioning (MinIO) | Complete | `internal/storage/` |
+| File storage (filesystem) | Complete | `internal/storage/` |
 | SHA256 checksums | Complete | Captured on upload |
 | Revision comments | Complete | `revisions.comment` |
 | User attribution | Complete | `revisions.created_by` |
@@ -93,7 +93,7 @@ CREATE TABLE revisions (
     revision_number INTEGER NOT NULL,
     properties JSONB NOT NULL DEFAULT '{}',
     file_key TEXT,
-    file_version TEXT,        -- MinIO version ID
+    file_version TEXT,        -- storage version ID
     file_checksum TEXT,       -- SHA256
     file_size BIGINT,
     thumbnail_key TEXT,
@@ -130,8 +130,8 @@ FreeCAD workbench maintained in separate [silo-mod](https://git.kindred-systems.
 |-----|-------------|--------|--------|
 | ~~**No rollback**~~ | ~~Cannot revert to previous revision~~ | ~~Data recovery difficult~~ | **Implemented** |
 | ~~**No comparison**~~ | ~~Cannot diff between revisions~~ | ~~Change tracking manual~~ | **Implemented** |
-| **No locking** | No concurrent edit protection | Multi-user unsafe | Open |
+| **No locking** | No concurrent edit protection | Multi-user unsafe | Partial (edit sessions with hard interference detection; full pessimistic locking not yet implemented) |
-| **No approval workflow** | No release/sign-off process | Quality control gap | Open |
+| ~~**No approval workflow**~~ | ~~No release/sign-off process~~ | ~~Quality control gap~~ | **Implemented** (YAML-configurable ECO workflows, multi-stage review gates, digital signatures) |
 
 ### 3.2 Important Gaps
 
@@ -283,7 +283,7 @@ Effort: Medium | Priority: Low | Risk: Low
 
 **Changes:**
 - Add thumbnail generation on file upload
-- Store in MinIO at `thumbnails/{part_number}/rev{n}.png`
+- Store at `thumbnails/{part_number}/rev{n}.png`
 - Expose via `GET /api/items/{pn}/thumbnail/{rev}`
 
 ---
@@ -355,47 +355,54 @@ These design decisions remain unresolved:
 
 ## Appendix A: File Structure
 
-Revision endpoints, status, labels, authentication, audit logging, and file attachments are implemented. Current structure:
+Current structure:
 
 ```
 internal/
   api/
+    approval_handlers.go    # Approval/ECO workflow endpoints
     audit_handlers.go       # Audit/completeness endpoints
     auth_handlers.go        # Login, tokens, OIDC
     bom_handlers.go         # Flat BOM, cost roll-up
+    broker.go               # SSE broker with targeted delivery
+    dag_handlers.go         # Dependency DAG endpoints
+    dependency_handlers.go  # .kc dependency resolution
     file_handlers.go        # Presigned uploads, item files, thumbnails
-    handlers.go             # Items, schemas, projects, revisions
+    handlers.go             # Items, schemas, projects, revisions, Server struct
+    job_handlers.go         # Job queue endpoints
+    location_handlers.go    # Location hierarchy endpoints
+    macro_handlers.go       # .kc macro endpoints
+    metadata_handlers.go    # .kc metadata endpoints
     middleware.go            # Auth middleware
     odoo_handlers.go        # Odoo integration endpoints
-    routes.go               # Route registration (78 endpoints)
+    pack_handlers.go        # .kc checkout packing
+    routes.go               # Route registration (~140 endpoints)
+    runner_handlers.go      # Job runner endpoints
     search.go               # Fuzzy search
+    session_handlers.go     # Edit session acquire/release/query
+    settings_handlers.go    # Admin settings endpoints
+    solver_handlers.go      # Solver service endpoints
+    sse_handler.go          # SSE event stream handler
+    workstation_handlers.go # Workstation registration
   auth/
     auth.go                 # Auth service: local, LDAP, OIDC
   db/
+    edit_sessions.go        # Edit session repository
     items.go                # Item and revision repository
     item_files.go           # File attachment repository
-    relationships.go        # BOM repository
+    jobs.go                 # Job queue repository
     projects.go             # Project repository
+    relationships.go        # BOM repository
+    workstations.go         # Workstation repository
+  modules/
+    modules.go              # Module registry (12 modules)
+    loader.go               # Config-to-module state loader
   storage/
-    storage.go              # MinIO file storage helpers
+    storage.go              # File storage helpers
 migrations/
   001_initial.sql           # Core schema
   ...
-  011_item_files.sql        # Item file attachments (latest)
+  023_edit_sessions.sql     # Edit session tracking (latest)
-```
-
-Future features would add:
-
-```
-internal/
-  api/
-    lock_handlers.go        # Locking endpoints
-  db/
-    locks.go                # Lock repository
-    releases.go             # Release repository
-migrations/
-  012_item_locks.sql        # Locking table
-  013_releases.sql          # Release management
 ```
 
 ---
@@ -465,28 +472,28 @@ This section compares Silo's capabilities against SOLIDWORKS PDM features. Gaps
 
 | Feature | SOLIDWORKS PDM | Silo Status | Priority | Complexity |
 |---------|---------------|-------------|----------|------------|
-| Check-in/check-out | Full pessimistic locking | None | High | Moderate |
+| Check-in/check-out | Full pessimistic locking | Partial (edit sessions with hard interference) | High | Moderate |
 | Version history | Complete with branching | Full (linear) | - | - |
 | Revision labels | A, B, C or custom schemes | Full (custom labels) | - | - |
 | Rollback/restore | Full | Full | - | - |
 | Compare revisions | Visual + metadata diff | Metadata diff only | Medium | Complex |
 | Get Latest Revision | One-click retrieval | Partial (API only) | Medium | Simple |
 
-Silo lacks pessimistic locking (check-out), which is critical for multi-user CAD environments where file merging is impractical. Visual diff comparison would require FreeCAD integration for CAD file visualization.
+Silo has edit sessions with hard interference detection (unique index on item + context_level + object_id prevents two users from editing the same object simultaneously). Full pessimistic file-level locking is not yet implemented. Visual diff comparison would require FreeCAD integration for CAD file visualization.
 
 ### C.2 Workflow Management
 
 | Feature | SOLIDWORKS PDM | Silo Status | Priority | Complexity |
 |---------|---------------|-------------|----------|------------|
-| Custom workflows | Full visual designer | None | Critical | Complex |
+| Custom workflows | Full visual designer | Full (YAML-defined state machines) | - | - |
-| State transitions | Configurable with permissions | Basic (status field only) | Critical | Complex |
+| State transitions | Configurable with permissions | Full (configurable transition rules) | - | - |
-| Parallel approvals | Multiple approvers required | None | High | Complex |
+| Parallel approvals | Multiple approvers required | Full (multi-stage review gates) | - | - |
 | Automatic transitions | Timer/condition-based | None | Medium | Moderate |
 | Email notifications | On state change | None | High | Moderate |
-| ECO process | Built-in change management | None | High | Complex |
+| ECO process | Built-in change management | Full (YAML-configurable ECO workflows) | - | - |
 | Child state conditions | Block parent if children invalid | None | Medium | Moderate |
 
-Workflow management is the largest functional gap. SOLIDWORKS PDM offers sophisticated state machines with parallel approvals, automatic transitions, and deep integration with engineering change processes. Silo currently has only a simple status field (draft/review/released/obsolete) with no transition rules or approval processes.
+Workflow management has been significantly addressed. Silo now supports YAML-defined state machine workflows with configurable transitions, multi-stage approval gates, and digital signatures. Remaining gaps: automatic timer-based transitions, email notifications, and child state condition enforcement.
 
 ### C.3 User Management & Security
 
@@ -549,13 +556,13 @@ CAD integration is maintained in separate repositories ([silo-mod](https://git.k
 | Feature | SOLIDWORKS PDM | Silo Status | Priority | Complexity |
 |---------|---------------|-------------|----------|------------|
 | ERP integration | SAP, Dynamics, etc. | Partial (Odoo stubs) | Medium | Complex |
-| API access | Full COM/REST API | Full REST API (78 endpoints) | - | - |
+| API access | Full COM/REST API | Full REST API (~140 endpoints) | - | - |
 | Dispatch scripts | Automation without coding | None | Medium | Moderate |
-| Task scheduler | Background processing | None | Medium | Moderate |
+| Task scheduler | Background processing | Full (job queue with runners) | - | - |
 | Email system | SMTP integration | None | High | Simple |
 | Web portal | Browser access | Full (React SPA + auth) | - | - |
 
-Silo has a comprehensive REST API (78 endpoints) and a full web UI with authentication. Odoo ERP integration has config/sync-log scaffolding but push/pull operations are stubs. Remaining gaps: email notifications, task scheduler, dispatch automation.
+Silo has a comprehensive REST API (~140 endpoints) and a full web UI with authentication. Odoo ERP integration has config/sync-log scaffolding but push/pull operations are stubs. Job queue with runner management is fully implemented. Remaining gaps: email notifications, dispatch automation.
 
 ### C.8 Reporting & Analytics
 
@@ -572,7 +579,7 @@ Reporting capabilities are absent. Basic reports (item counts, revision activity
 
 | Feature | SOLIDWORKS PDM | Silo Status | Priority | Complexity |
 |---------|---------------|-------------|----------|------------|
-| File versioning | Automatic | Full (MinIO) | - | - |
+| File versioning | Automatic | Full (filesystem) | - | - |
 | File preview | Thumbnails, 3D preview | None | Medium | Complex |
 | File conversion | PDF, DXF generation | None | Medium | Complex |
 | Replication | Multi-site sync | None | Low | Complex |
@@ -586,13 +593,13 @@ File storage works well. Thumbnail generation and file preview would significant
 
 | Category | Feature | SW PDM Standard | SW PDM Pro | Silo Current | Silo Planned |
 |----------|---------|-----------------|------------|--------------|--------------|
-| **Version Control** | Check-in/out | Yes | Yes | No | Tier 1 |
+| **Version Control** | Check-in/out | Yes | Yes | Partial (edit sessions) | Tier 1 |
 | | Version history | Yes | Yes | Yes | - |
 | | Rollback | Yes | Yes | Yes | - |
 | | Revision labels/status | Yes | Yes | Yes | - |
 | | Revision comparison | Yes | Yes | Yes (metadata) | - |
-| **Workflow** | Custom workflows | Limited | Yes | No | Tier 4 |
+| **Workflow** | Custom workflows | Limited | Yes | Yes (YAML state machines) | - |
-| | Parallel approval | No | Yes | No | Tier 4 |
+| | Parallel approval | No | Yes | Yes (multi-stage gates) | - |
 | | Notifications | No | Yes | No | Tier 1 |
 | **Security** | User auth | Windows | Windows/LDAP | Yes (local, LDAP, OIDC) | - |
 | | Permissions | Basic | Granular | Partial (role-based) | Tier 4 |
@@ -606,7 +613,7 @@ File storage works well. Thumbnail generation and file preview would significant
 | **Data** | CSV import/export | Yes | Yes | Yes | - |
 | | ODS import/export | No | No | Yes | - |
 | | Project management | Yes | Yes | Yes | - |
-| **Integration** | API | Limited | Full | Full REST (78) | - |
+| **Integration** | API | Limited | Full | Full REST (~140) | - |
 | | ERP connectors | No | Yes | Partial (Odoo stubs) | Tier 6 |
 | | Web access | No | Yes | Yes (React SPA + auth) | - |
 | **Files** | Versioning | Yes | Yes | Yes | - |

docs/INSTALL.md

@@ -3,7 +3,7 @@
 This guide covers two installation methods:
 
 - **[Option A: Docker Compose](#option-a-docker-compose)** — self-contained stack with all services. Recommended for evaluation, small teams, and environments where Docker is the standard.
-- **[Option B: Daemon Install](#option-b-daemon-install-systemd--external-services)** — systemd service with external PostgreSQL, MinIO, and optional LDAP/nginx. Recommended for production deployments integrated with existing infrastructure.
+- **[Option B: Daemon Install](#option-b-daemon-install-systemd--external-services)** — systemd service with external PostgreSQL and optional LDAP/nginx. Files are stored on the local filesystem. Recommended for production deployments integrated with existing infrastructure.
 
 Both methods produce the same result: a running Silo server with a web UI, REST API, and authentication.
 
@@ -48,7 +48,7 @@ Regardless of which method you choose:
 
 ## Option A: Docker Compose
 
-A single Docker Compose file runs everything: PostgreSQL, MinIO, OpenLDAP, and Silo. An optional nginx container can be enabled for reverse proxying.
+A single Docker Compose file runs everything: PostgreSQL, OpenLDAP, and Silo. Files are stored on the local filesystem. An optional nginx container can be enabled for reverse proxying.
 
 ### A.1 Prerequisites
 
@@ -80,7 +80,6 @@ The setup script generates credentials and configuration files:
 It prompts for:
 - Server domain (default: `localhost`)
 - PostgreSQL password (auto-generated if you press Enter)
-- MinIO credentials (auto-generated)
 - OpenLDAP admin password and initial user (auto-generated)
 - Silo local admin account (fallback when LDAP is unavailable)
 
@@ -106,7 +105,7 @@ Wait for all services to become healthy:
 docker compose -f deployments/docker-compose.allinone.yaml ps
 ```
 
-You should see `silo-postgres`, `silo-minio`, `silo-openldap`, and `silo-api` all in a healthy state.
+You should see `silo-postgres`, `silo-openldap`, and `silo-api` all in a healthy state.
 
 View logs:
 
@@ -124,7 +123,7 @@ docker compose -f deployments/docker-compose.allinone.yaml logs -f silo
 # Health check
 curl http://localhost:8080/health
 
-# Readiness check (includes database and storage connectivity)
+# Readiness check (includes database connectivity)
 curl http://localhost:8080/ready
 ```
 
@@ -226,7 +225,7 @@ The Silo container is rebuilt from the updated source. Database migrations in `m
 
 ## Option B: Daemon Install (systemd + External Services)
 
-This method runs Silo as a systemd service on a dedicated host, connecting to externally managed PostgreSQL, MinIO, and optionally LDAP services.
+This method runs Silo as a systemd service on a dedicated host, connecting to externally managed PostgreSQL and optionally LDAP services. Files are stored on the local filesystem.
 
 ### B.1 Architecture Overview
 
@@ -240,21 +239,22 @@ This method runs Silo as a systemd service on a dedicated host, connecting to ex
                     │  ┌───────▼────────┐  │
                     │  │     silod       │  │
                     │  │  (API server)   │  │
-                    │  └──┬─────────┬───┘  │
+                    │  │  Files: /opt/   │  │
-                    └─────┼─────────┼──────┘
+                    │  │   silo/data     │  │
-                          │         │
+                    │  └──────┬─────────┘  │
-              ┌───────────▼──┐  ┌───▼──────────────┐
+                    └─────────┼────────────┘
-              │ PostgreSQL 16│  │ MinIO (S3)        │
+                              │
-              │   :5432      │  │ :9000 API         │
+                  ┌───────────▼──┐
-              └──────────────┘  │ :9001 Console     │
+                  │ PostgreSQL 16│
-                                └──────────────────┘
+                  │   :5432      │
+                  └──────────────┘
 ```
 
 ### B.2 Prerequisites
 
 - Linux host (Debian/Ubuntu or RHEL/Fedora/AlmaLinux)
 - Root or sudo access
-- Network access to your PostgreSQL and MinIO servers
+- Network access to your PostgreSQL server
 
 The setup script installs Go and other build dependencies automatically.
 
@@ -281,26 +281,6 @@ Verify:
 psql -h YOUR_PG_HOST -U silo -d silo -c 'SELECT 1'
 ```
 
-#### MinIO
-
-Install MinIO and create a bucket and service account:
-
-- [MinIO quickstart](https://min.io/docs/minio/linux/index.html)
-
-```bash
-# Using the MinIO client (mc):
-mc alias set local http://YOUR_MINIO_HOST:9000 minioadmin minioadmin
-mc mb local/silo-files
-mc admin user add local silouser YOUR_MINIO_SECRET
-mc admin policy attach local readwrite --user silouser
-```
-
-Verify:
-
-```bash
-curl -I http://YOUR_MINIO_HOST:9000/minio/health/live
-```
-
 #### LDAP / FreeIPA (Optional)
 
 For LDAP authentication, you need an LDAP server with user and group entries. Options:
@@ -339,10 +319,10 @@ The script:
 4. Clones the repository
 5. Creates the environment file template
 
-To override the default service hostnames:
+To override the default database hostname:
 
 ```bash
-SILO_DB_HOST=db.example.com SILO_MINIO_HOST=s3.example.com sudo -E bash scripts/setup-host.sh
+SILO_DB_HOST=db.example.com sudo -E bash scripts/setup-host.sh
 ```
 
 ### B.5 Configure Credentials
@@ -357,10 +337,6 @@ sudo nano /etc/silo/silod.env
 # Database
 SILO_DB_PASSWORD=your-database-password
 
-# MinIO
-SILO_MINIO_ACCESS_KEY=silouser
-SILO_MINIO_SECRET_KEY=your-minio-secret
-
 # Authentication
 SILO_SESSION_SECRET=generate-a-long-random-string
 SILO_ADMIN_USERNAME=admin
@@ -379,7 +355,7 @@ Review the server configuration:
 sudo nano /etc/silo/config.yaml
 ```
 
-Update `database.host`, `storage.endpoint`, `server.base_url`, and authentication settings for your environment. See [CONFIGURATION.md](CONFIGURATION.md) for all options.
+Update `database.host`, `storage.filesystem.root_dir`, `server.base_url`, and authentication settings for your environment. See [CONFIGURATION.md](CONFIGURATION.md) for all options.
 
 ### B.6 Deploy
 
@@ -412,10 +388,10 @@ sudo /opt/silo/src/scripts/deploy.sh --restart-only
 sudo /opt/silo/src/scripts/deploy.sh --status
 ```
 
-To override the target host or database host:
+To override the target host:
 
 ```bash
-SILO_DEPLOY_TARGET=silo.example.com SILO_DB_HOST=db.example.com sudo -E scripts/deploy.sh
+SILO_DEPLOY_TARGET=silo.example.com sudo -E scripts/deploy.sh
 ```
 
 ### B.7 Set Up Nginx and TLS
@@ -515,4 +491,7 @@ After a successful installation:
 | [SPECIFICATION.md](SPECIFICATION.md) | Full design specification and API reference |
 | [STATUS.md](STATUS.md) | Implementation status |
 | [GAP_ANALYSIS.md](GAP_ANALYSIS.md) | Gap analysis and revision control roadmap |
+| [MODULES.md](MODULES.md) | Module system specification |
+| [WORKERS.md](WORKERS.md) | Job queue and runner system |
+| [SOLVER.md](SOLVER.md) | Assembly solver service |
 | [COMPONENT_AUDIT.md](COMPONENT_AUDIT.md) | Component audit tool design |

docs/KC_SERVER.md

@@ -0,0 +1,485 @@
+# .kc Server-Side Metadata Integration
+
+**Status:** Draft
+**Date:** February 2026
+
+---
+
+## 1. Purpose
+
+When a `.kc` file is committed to Silo, the server extracts and indexes the `silo/` directory contents so that metadata is queryable, diffable, and streamable without downloading the full file. This document specifies the server-side processing pipeline, database storage, API endpoints, and SSE events that support the Create viewport widgets defined in [SILO_VIEWPORT.md](SILO_VIEWPORT.md).
+
+The core principle: **the `.kc` file is the transport format; Silo is the index.** The `silo/` directory entries are extracted into database columns on commit and packed back into the ZIP on checkout. The server never modifies the FreeCAD standard zone (`Document.xml`, `.brp` files, `thumbnails/`).
+
+---
+
+## 2. Commit Pipeline
+
+When a `.kc` file is uploaded via `POST /api/items/{partNumber}/file`, the server runs an extraction pipeline before returning success.
+
+### 2.1 Pipeline Steps
+
+```
+Client uploads .kc file
+         |
+         v
++-----------------------------+
+|  1. Store file to disk      |  (existing behavior -- unchanged)
+|     items/{pn}/rev{N}.kc    |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  2. Open ZIP, read silo/    |
+|     Parse each entry        |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  3. Validate manifest.json  |
+|     - UUID matches item     |
+|     - kc_version supported  |
+|     - revision_hash present |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  4. Index metadata          |
+|     - Upsert item_metadata  |
+|     - Upsert dependencies   |
+|     - Append history entry  |
+|     - Snapshot approvals    |
+|     - Register macros       |
+|     - Register job defs     |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  5. Broadcast SSE events    |
+|     - revision.created      |
+|     - metadata.updated      |
+|     - bom.changed (if deps  |
+|       differ from previous) |
++-----------------------------+
+         |
+         v
+       Return 201 Created
+```
+
+### 2.2 Validation Rules
+
+| Check | Failure response |
+|-------|-----------------|
+| `silo/manifest.json` missing | `400 Bad Request` -- file is `.fcstd` not `.kc` |
+| `manifest.uuid` doesn't match item's UUID | `409 Conflict` -- wrong item |
+| `manifest.kc_version` > server's supported version | `422 Unprocessable` -- client newer than server |
+| `manifest.revision_hash` matches current head | `200 OK` (no-op, file unchanged) |
+| Any `silo/` JSON fails to parse | `422 Unprocessable` with path and parse error |
+
+If validation fails, the blob is still stored (the user uploaded it), but no metadata indexing occurs. The item's revision is created with a `metadata_error` flag so the web UI can surface the problem.
+
+### 2.3 Backward Compatibility
+
+Plain `.fcstd` files (no `silo/` directory) continue to work exactly as today -- stored on disk, revision created, no metadata extraction. The pipeline short-circuits at step 2 when no `silo/` directory is found.
+
+---
+
+## 3. Database Schema
+
+### 3.1 `item_metadata` Table
+
+Stores the indexed contents of `silo/metadata.json` as structured JSONB, searchable and filterable via the existing item query endpoints.
+
+```sql
+CREATE TABLE item_metadata (
+    item_id UUID PRIMARY KEY REFERENCES items(id) ON DELETE CASCADE,
+    schema_name TEXT,
+    tags TEXT[] NOT NULL DEFAULT '{}',
+    lifecycle_state TEXT NOT NULL DEFAULT 'draft',
+    fields JSONB NOT NULL DEFAULT '{}',
+    kc_version TEXT,
+    manifest_uuid UUID,
+    silo_instance TEXT,
+    revision_hash TEXT,
+    updated_at TIMESTAMPTZ DEFAULT now(),
+    updated_by TEXT
+);
+
+CREATE INDEX idx_item_metadata_tags ON item_metadata USING GIN (tags);
+CREATE INDEX idx_item_metadata_lifecycle ON item_metadata (lifecycle_state);
+CREATE INDEX idx_item_metadata_fields ON item_metadata USING GIN (fields);
+```
+
+On commit, the server upserts this row from `silo/manifest.json` and `silo/metadata.json`. The `fields` column contains the schema-driven key-value pairs exactly as they appear in the JSON.
+
+### 3.2 `item_dependencies` Table
+
+Stores the indexed contents of `silo/dependencies.json`. Replaces the BOM for assembly relationships that originate from the CAD model.
+
+```sql
+CREATE TABLE item_dependencies (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    parent_item_id UUID REFERENCES items(id) ON DELETE CASCADE,
+    child_uuid UUID NOT NULL,
+    child_part_number TEXT,
+    child_revision INTEGER,
+    quantity DECIMAL,
+    label TEXT,
+    relationship TEXT NOT NULL DEFAULT 'component',
+    revision_number INTEGER NOT NULL,
+    created_at TIMESTAMPTZ DEFAULT now()
+);
+
+CREATE INDEX idx_item_deps_parent ON item_dependencies (parent_item_id);
+CREATE INDEX idx_item_deps_child ON item_dependencies (child_uuid);
+```
+
+This table complements the existing `relationships` table. The `relationships` table is the server-authoritative BOM (editable via the web UI and API). The `item_dependencies` table is the CAD-authoritative record extracted from the file. BOM merge (per [BOM_MERGE.md](BOM_MERGE.md)) reconciles the two.
+
+### 3.3 `item_approvals` Table
+
+Stores the indexed contents of `silo/approvals.json`. Server-authoritative -- the `.kc` snapshot is a read cache.
+
+```sql
+CREATE TABLE item_approvals (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id UUID REFERENCES items(id) ON DELETE CASCADE,
+    eco_number TEXT,
+    state TEXT NOT NULL DEFAULT 'draft',
+    updated_at TIMESTAMPTZ DEFAULT now(),
+    updated_by TEXT
+);
+
+CREATE TABLE approval_signatures (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    approval_id UUID REFERENCES item_approvals(id) ON DELETE CASCADE,
+    username TEXT NOT NULL,
+    role TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'pending',
+    signed_at TIMESTAMPTZ,
+    comment TEXT
+);
+```
+
+These tables exist independent of `.kc` commits -- approvals are created and managed through the web UI and API. On `.kc` checkout, the current approval state is serialized into `silo/approvals.json` for offline display.
+
+### 3.4 `item_macros` Table
+
+Registers macros from `silo/macros/` for server-side discoverability and the future Macro Store module.
+
+```sql
+CREATE TABLE item_macros (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id UUID REFERENCES items(id) ON DELETE CASCADE,
+    filename TEXT NOT NULL,
+    trigger TEXT NOT NULL DEFAULT 'manual',
+    content TEXT NOT NULL,
+    revision_number INTEGER NOT NULL,
+    created_at TIMESTAMPTZ DEFAULT now(),
+    UNIQUE(item_id, filename)
+);
+```
+
+---
+
+## 4. API Endpoints
+
+These endpoints serve the viewport widgets in Create. All are under `/api/items/{partNumber}` and follow the existing auth model.
+
+### 4.1 Metadata
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/metadata` | viewer | Get indexed metadata (schema fields, tags, lifecycle) |
+| `PUT` | `/metadata` | editor | Update metadata fields from client |
+| `PATCH` | `/metadata/lifecycle` | editor | Transition lifecycle state |
+| `PATCH` | `/metadata/tags` | editor | Add/remove tags |
+
+**`GET /api/items/{partNumber}/metadata`**
+
+Returns the indexed metadata for viewport display. This is the fast path -- reads from `item_metadata` rather than downloading and parsing the `.kc` ZIP.
+
+```json
+{
+  "schema_name": "mechanical-part-v2",
+  "lifecycle_state": "draft",
+  "tags": ["structural", "aluminum"],
+  "fields": {
+    "material": "6061-T6",
+    "finish": "anodized",
+    "weight_kg": 0.34,
+    "category": "bracket"
+  },
+  "manifest": {
+    "uuid": "550e8400-e29b-41d4-a716-446655440000",
+    "silo_instance": "https://silo.example.com",
+    "revision_hash": "a1b2c3d4e5f6",
+    "kc_version": "1.0"
+  },
+  "updated_at": "2026-02-13T20:30:00Z",
+  "updated_by": "joseph"
+}
+```
+
+**`PUT /api/items/{partNumber}/metadata`**
+
+Accepts a partial update of schema fields. The server merges into the existing `fields` JSONB. This is the write-back path for the Metadata Editor widget.
+
+```json
+{
+  "fields": {
+    "material": "7075-T6",
+    "weight_kg": 0.31
+  }
+}
+```
+
+The server validates field names against the schema descriptor. Unknown fields are rejected with `422`.
+
+**`PATCH /api/items/{partNumber}/metadata/lifecycle`**
+
+Transitions lifecycle state. The server validates the transition is permitted (e.g., `draft` -> `review` is allowed, `released` -> `draft` is not without admin override).
+
+```json
+{ "state": "review" }
+```
+
+### 4.2 Dependencies
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/dependencies` | viewer | Get CAD-extracted dependency list |
+| `GET` | `/dependencies/resolve` | viewer | Resolve UUIDs to current part numbers and file status |
+
+**`GET /api/items/{partNumber}/dependencies`**
+
+Returns the raw dependency list from the last `.kc` commit.
+
+**`GET /api/items/{partNumber}/dependencies/resolve`**
+
+Returns the dependency list with each UUID resolved to its current part number, revision, and whether the file exists on disk. This is what the Dependency Table widget calls to populate the status column.
+
+```json
+{
+  "links": [
+    {
+      "uuid": "660e8400-...",
+      "part_number": "KC-BRK-0042",
+      "label": "Base Plate",
+      "revision": 2,
+      "quantity": 1,
+      "resolved": true,
+      "file_available": true
+    },
+    {
+      "uuid": "770e8400-...",
+      "part_number": "KC-HDW-0108",
+      "label": "M6 SHCS",
+      "revision": 1,
+      "quantity": 4,
+      "resolved": true,
+      "file_available": true
+    },
+    {
+      "uuid": "880e8400-...",
+      "part_number": null,
+      "label": "Cover Panel",
+      "revision": 1,
+      "quantity": 1,
+      "resolved": false,
+      "file_available": false
+    }
+  ]
+}
+```
+
+### 4.3 Approvals
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/approvals` | viewer | Get current approval state |
+| `POST` | `/approvals` | editor | Create ECO / start approval workflow |
+| `POST` | `/approvals/{id}/sign` | editor | Sign (approve/reject) |
+
+These endpoints power the Approvals Viewer widget. The viewer is read-only in Create -- sign actions happen in the web UI, but the API exists for both.
+
+### 4.4 Macros
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/macros` | viewer | List registered macros |
+| `GET` | `/macros/{filename}` | viewer | Get macro source |
+
+Read-only server-side. Macros are authored in Create and committed inside the `.kc`. The server indexes them for discoverability in the future Macro Store.
+
+### 4.5 Existing Endpoints (unchanged)
+
+The viewport widgets also consume these existing endpoints:
+
+| Widget | Endpoint | Purpose |
+|--------|----------|---------|
+| History Viewer | `GET /api/items/{pn}/revisions` | Full revision list |
+| History Viewer | `GET /api/items/{pn}/revisions/compare` | Property diff |
+| Job Viewer | `GET /api/jobs?item={pn}&definition={name}&limit=1` | Last job run |
+| Job Viewer | `POST /api/jobs` | Trigger job |
+| Job Viewer | `GET /api/jobs/{id}/logs` | Job log |
+| Manifest Viewer | `GET /api/items/{pn}` | Item details (UUID, etc.) |
+
+No changes needed to these -- they already exist and return the data the widgets need.
+
+---
+
+## 5. Checkout Pipeline
+
+When a client downloads a `.kc` via `GET /api/items/{partNumber}/file`, the server packs current server-side state into the `silo/` directory before serving the file. This ensures the client always gets the latest metadata, even if it was edited via the web UI since the last commit.
+
+### 5.1 Pipeline Steps
+
+```
+Client requests file download
+         |
+         v
++-----------------------------+
+|  1. Read .kc from disk      |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  2. Pack silo/ from DB      |
+|     - manifest.json (item)  |
+|     - metadata.json (index) |
+|     - history.json (revs)   |
+|     - approvals.json (ECO)  |
+|     - dependencies.json     |
+|     - macros/ (index)       |
+|     - jobs/ (job defs)      |
++-----------------------------+
+         |
+         v
++-----------------------------+
+|  3. Replace silo/ in ZIP    |
+|     Remove old entries      |
+|     Write packed entries    |
++-----------------------------+
+         |
+         v
+       Stream .kc to client
+```
+
+### 5.2 Packing Rules
+
+| `silo/` entry | Source | Notes |
+|---------------|--------|-------|
+| `manifest.json` | `item_metadata` + `items` table | UUID from item, revision_hash from latest revision |
+| `metadata.json` | `item_metadata.fields` + tags + lifecycle | Serialized from indexed columns |
+| `history.json` | `revisions` table | Last 20 revisions for this item |
+| `approvals.json` | `item_approvals` + `approval_signatures` | Current ECO state, omitted if no active ECO |
+| `dependencies.json` | `item_dependencies` | Current revision's dependency list |
+| `macros/*.py` | `item_macros` | All registered macros |
+| `jobs/*.yaml` | `job_definitions` filtered by item type | Job definitions matching this item's trigger filters |
+
+### 5.3 Caching
+
+Packing the `silo/` directory on every download has a cost. To mitigate:
+
+- **ETag header**: The response includes an ETag computed from the revision number + metadata `updated_at`. If the client sends `If-None-Match`, the server can return `304 Not Modified`.
+- **Lazy packing**: If the `.kc` blob's `silo/manifest.json` revision_hash matches the current head *and* `item_metadata.updated_at` is older than the blob's upload time, skip repacking entirely -- the blob is already current.
+
+---
+
+## 6. SSE Events
+
+The viewport widgets subscribe to SSE for live updates. These events are broadcast when server-side metadata changes, whether via `.kc` commit, web UI edit, or API call.
+
+| Event | Payload | Trigger |
+|-------|---------|---------|
+| `metadata.updated` | `{part_number, changed_fields[], lifecycle_state, updated_by}` | Metadata PUT/PATCH |
+| `metadata.lifecycle` | `{part_number, from_state, to_state, updated_by}` | Lifecycle transition |
+| `metadata.tags` | `{part_number, added[], removed[]}` | Tag add/remove |
+| `approval.created` | `{part_number, eco_number, state}` | ECO created |
+| `approval.signed` | `{part_number, eco_number, user, role, status}` | Approver action |
+| `approval.completed` | `{part_number, eco_number, final_state}` | All approvers acted |
+| `dependencies.changed` | `{part_number, added[], removed[], changed[]}` | Dependency diff on commit |
+
+Existing events (`revision.created`, `job.*`, `bom.changed`) continue to work as documented in [SPECIFICATION.md](SPECIFICATION.md) and [WORKERS.md](WORKERS.md).
+
+### 6.1 Widget Subscription Map
+
+| Viewport widget | Subscribes to |
+|-----------------|---------------|
+| Manifest Viewer | -- (read-only, no live updates) |
+| Metadata Editor | `metadata.updated`, `metadata.lifecycle`, `metadata.tags` |
+| History Viewer | `revision.created` |
+| Approvals Viewer | `approval.created`, `approval.signed`, `approval.completed` |
+| Dependency Table | `dependencies.changed` |
+| Job Viewer | `job.created`, `job.progress`, `job.completed`, `job.failed` |
+| Macro Editor | -- (local-only until committed) |
+
+---
+
+## 7. Web UI Integration
+
+The Silo web UI also benefits from indexed metadata. These are additions to existing pages, not new pages.
+
+### 7.1 Items Page
+
+The item detail panel gains a **Metadata** tab (alongside Main, Properties, Revisions, BOM, Where Used) showing the schema-driven form from `GET /api/items/{pn}/metadata`. Editable for editors.
+
+### 7.2 Items List
+
+New filterable columns: `lifecycle_state`, `tags`. The existing search endpoint gains metadata-aware filtering:
+
+```
+GET /api/items?lifecycle=released&tag=aluminum
+GET /api/items/search?q=bracket&lifecycle=draft
+```
+
+### 7.3 Approvals Page
+
+A new page accessible from the top navigation (visible when a future `approvals` module is enabled). Lists all active ECOs with their approval progress.
+
+---
+
+## 8. Migration
+
+### 8.1 Database Migration
+
+A single migration adds the `item_metadata`, `item_dependencies`, `item_approvals`, `approval_signatures`, and `item_macros` tables. Existing items have no metadata rows -- they're created on first `.kc` commit or via `PUT /api/items/{pn}/metadata`.
+
+### 8.2 Backfill
+
+For items that already have `.kc` files stored on disk (committed before this feature), an admin endpoint re-runs the extraction pipeline:
+
+```
+POST /api/admin/reindex-metadata
+```
+
+This iterates all items with `.kc` files, opens each ZIP, and indexes the `silo/` contents. Idempotent -- safe to run multiple times.
+
+---
+
+## 9. Implementation Order
+
+| Phase | Server work | Supports client phase |
+|-------|------------|----------------------|
+| 1 | `item_metadata` table + `GET/PUT /metadata` + commit extraction | SILO_VIEWPORT Phase 1-2 (Manifest, Metadata) |
+| 2 | Pack `silo/` on checkout + ETag caching | SILO_VIEWPORT Phase 1-3 |
+| 3 | `item_dependencies` table + `/dependencies/resolve` | SILO_VIEWPORT Phase 5 (Dependency Table) |
+| 4 | `item_macros` table + `/macros` endpoints | SILO_VIEWPORT Phase 6 (Macro Editor) |
+| 5 | `item_approvals` tables + `/approvals` endpoints | SILO_VIEWPORT Phase 7 (Approvals Viewer) |
+| 6 | SSE events for metadata/approvals/dependencies | SILO_VIEWPORT Phase 8 (Live integration) |
+| 7 | Web UI metadata tab + list filters | Independent of client |
+
+Phases 1-2 are prerequisite for the viewport to work with live data. Phases 3-6 can be built in parallel with client widget development. Phase 7 is web-UI-only and independent.
+
+---
+
+## 10. References
+
+- [SILO_VIEWPORT.md](SILO_VIEWPORT.md) -- Client-side viewport widget specification
+- [KC_SPECIFICATION.md](KC_SPECIFICATION.md) -- .kc file format specification
+- [SPECIFICATION.md](SPECIFICATION.md) -- Silo server API reference
+- [BOM_MERGE.md](BOM_MERGE.md) -- BOM merge rules (dependency reconciliation)
+- [WORKERS.md](WORKERS.md) -- Job queue (job viewer data source)
+- [MODULES.md](MODULES.md) -- Module system (approval module gating)
+- [ROADMAP.md](ROADMAP.md) -- Platform roadmap tiers

docs/MODULES.md

@@ -0,0 +1,797 @@
+# Module System Specification
+
+**Status:** Draft
+**Last Updated:** 2026-03-01
+
+---
+
+## 1. Purpose
+
+Silo's module system defines the boundary between required infrastructure and optional capabilities. Each module groups a set of API endpoints, UI views, and configuration parameters. Modules can be enabled or disabled at runtime by administrators via the web UI, and clients can query which modules are active to adapt their feature set.
+
+The goal: after initial deployment (where `config.yaml` sets database, storage, and server bind), all further operational configuration happens through the admin settings UI. The YAML file becomes the bootstrap; the database becomes the runtime source of truth.
+
+---
+
+## 2. Module Registry
+
+### 2.1 Required Modules
+
+These cannot be disabled. They define what Silo *is*.
+
+| Module ID | Name | Description |
+|-----------|------|-------------|
+| `core` | Core PDM | Items, revisions, files, BOM, search, import/export, part number generation |
+| `schemas` | Schemas | Part numbering schema parsing, segment management, form descriptors |
+| `storage` | Storage | Filesystem storage |
+
+### 2.2 Optional Modules
+
+| Module ID | Name | Default | Description |
+|-----------|------|---------|-------------|
+| `auth` | Authentication | `true` | Local, LDAP, OIDC authentication and RBAC |
+| `projects` | Projects | `true` | Project management and item tagging |
+| `audit` | Audit | `true` | Audit logging, completeness scoring |
+| `odoo` | Odoo ERP | `false` | Odoo integration (config, sync-log, push/pull) |
+| `freecad` | Create Integration | `true` | URI scheme, executable path, client settings |
+| `jobs` | Job Queue | `false` | Async compute jobs, runner management |
+| `dag` | Dependency DAG | `false` | Feature DAG sync, validation states, interference detection |
+| `solver` | Solver | `false` | Assembly constraint solving via server-side runners |
+| `sessions` | Sessions | `true` | Workstation registration, edit sessions, and presence tracking |
+
+### 2.3 Module Dependencies
+
+Some modules require others to function:
+
+| Module | Requires |
+|--------|----------|
+| `dag` | `jobs` |
+| `jobs` | `auth` (runner tokens) |
+| `odoo` | `auth` |
+| `solver` | `jobs` |
+| `sessions` | `auth` |
+
+When enabling a module, its dependencies are validated. The server rejects enabling `dag` without `jobs`. Disabling a module that others depend on shows a warning listing dependents.
+
+---
+
+## 3. Endpoint-to-Module Mapping
+
+### 3.1 `core` (required)
+
+```
+# Health
+GET    /health
+GET    /ready
+
+# Items
+GET    /api/items
+GET    /api/items/search
+GET    /api/items/by-uuid/{uuid}
+GET    /api/items/export.csv
+GET    /api/items/template.csv
+GET    /api/items/export.ods
+GET    /api/items/template.ods
+POST   /api/items
+POST   /api/items/import
+POST   /api/items/import.ods
+GET    /api/items/{partNumber}
+PUT    /api/items/{partNumber}
+DELETE /api/items/{partNumber}
+
+# Revisions
+GET    /api/items/{partNumber}/revisions
+GET    /api/items/{partNumber}/revisions/compare
+GET    /api/items/{partNumber}/revisions/{revision}
+POST   /api/items/{partNumber}/revisions
+PATCH  /api/items/{partNumber}/revisions/{revision}
+POST   /api/items/{partNumber}/revisions/{revision}/rollback
+
+# Files
+GET    /api/items/{partNumber}/files
+GET    /api/items/{partNumber}/file
+GET    /api/items/{partNumber}/file/{revision}
+POST   /api/items/{partNumber}/file
+POST   /api/items/{partNumber}/files
+DELETE /api/items/{partNumber}/files/{fileId}
+PUT    /api/items/{partNumber}/thumbnail
+POST   /api/uploads/presign
+
+# BOM
+GET    /api/items/{partNumber}/bom
+GET    /api/items/{partNumber}/bom/expanded
+GET    /api/items/{partNumber}/bom/flat
+GET    /api/items/{partNumber}/bom/cost
+GET    /api/items/{partNumber}/bom/where-used
+GET    /api/items/{partNumber}/bom/export.csv
+GET    /api/items/{partNumber}/bom/export.ods
+POST   /api/items/{partNumber}/bom
+POST   /api/items/{partNumber}/bom/import
+POST   /api/items/{partNumber}/bom/merge
+PUT    /api/items/{partNumber}/bom/{childPartNumber}
+DELETE /api/items/{partNumber}/bom/{childPartNumber}
+
+# .kc Metadata
+GET    /api/items/{partNumber}/metadata
+PUT    /api/items/{partNumber}/metadata
+PATCH  /api/items/{partNumber}/metadata/lifecycle
+PATCH  /api/items/{partNumber}/metadata/tags
+
+# .kc Dependencies
+GET    /api/items/{partNumber}/dependencies
+GET    /api/items/{partNumber}/dependencies/resolve
+
+# .kc Macros
+GET    /api/items/{partNumber}/macros
+GET    /api/items/{partNumber}/macros/{filename}
+
+# Part Number Generation
+POST   /api/generate-part-number
+
+# Sheets
+POST   /api/sheets/diff
+
+# Settings & Modules (admin)
+GET    /api/modules
+GET    /api/admin/settings
+GET    /api/admin/settings/{module}
+PUT    /api/admin/settings/{module}
+POST   /api/admin/settings/{module}/test
+```
+
+### 3.2 `schemas` (required)
+
+```
+GET    /api/schemas
+GET    /api/schemas/{name}
+GET    /api/schemas/{name}/form
+POST   /api/schemas/{name}/segments/{segment}/values
+PUT    /api/schemas/{name}/segments/{segment}/values/{code}
+DELETE /api/schemas/{name}/segments/{segment}/values/{code}
+```
+
+### 3.3 `storage` (required)
+
+No dedicated endpoints — storage is consumed internally by file upload/download in `core`. Exposed through admin settings for connection status visibility.
+
+### 3.4 `auth`
+
+```
+# Public (login flow)
+GET    /login
+POST   /login
+POST   /logout
+GET    /auth/oidc
+GET    /auth/callback
+
+# Authenticated
+GET    /api/auth/me
+GET    /api/auth/tokens
+POST   /api/auth/tokens
+DELETE /api/auth/tokens/{id}
+
+# Web UI
+GET    /settings                          (account info, tokens)
+POST   /settings/tokens
+POST   /settings/tokens/{id}/revoke
+```
+
+When `auth` is disabled, all routes are open and a synthetic `dev` admin user is injected (current behavior).
+
+### 3.5 `projects`
+
+```
+GET    /api/projects
+GET    /api/projects/{code}
+GET    /api/projects/{code}/items
+GET    /api/projects/{code}/sheet.ods
+POST   /api/projects
+PUT    /api/projects/{code}
+DELETE /api/projects/{code}
+
+# Item-project tagging
+GET    /api/items/{partNumber}/projects
+POST   /api/items/{partNumber}/projects
+DELETE /api/items/{partNumber}/projects/{code}
+```
+
+When disabled: project tag endpoints return `404`, project columns are hidden in UI list views, project filter is removed from item search.
+
+### 3.6 `audit`
+
+```
+GET    /api/audit/completeness
+GET    /api/audit/completeness/{partNumber}
+```
+
+When disabled: audit log table continues to receive writes (it's part of core middleware), but the completeness scoring endpoints and the Audit page in the web UI are hidden. Future: retention policies, export, and compliance reporting endpoints live here.
+
+### 3.7 `odoo`
+
+```
+GET    /api/integrations/odoo/config
+GET    /api/integrations/odoo/sync-log
+PUT    /api/integrations/odoo/config
+POST   /api/integrations/odoo/test-connection
+POST   /api/integrations/odoo/sync/push/{partNumber}
+POST   /api/integrations/odoo/sync/pull/{odooId}
+```
+
+### 3.8 `freecad`
+
+No dedicated API endpoints currently. Configures URI scheme and executable path used by the web UI's "Open in Create" links and by CLI operations. Future: client configuration distribution endpoint.
+
+### 3.9 `jobs`
+
+```
+# User-facing
+GET    /api/jobs
+GET    /api/jobs/{jobID}
+GET    /api/jobs/{jobID}/logs
+POST   /api/jobs
+POST   /api/jobs/{jobID}/cancel
+
+# Job definitions
+GET    /api/job-definitions
+GET    /api/job-definitions/{name}
+POST   /api/job-definitions/reload
+
+# Runner management (admin)
+GET    /api/runners
+POST   /api/runners
+DELETE /api/runners/{runnerID}
+
+# Runner-facing (runner token auth)
+POST   /api/runner/heartbeat
+POST   /api/runner/claim
+PUT    /api/runner/jobs/{jobID}/progress
+POST   /api/runner/jobs/{jobID}/complete
+POST   /api/runner/jobs/{jobID}/fail
+POST   /api/runner/jobs/{jobID}/log
+PUT    /api/runner/jobs/{jobID}/dag
+```
+
+### 3.10 `dag`
+
+```
+GET    /api/items/{partNumber}/dag
+GET    /api/items/{partNumber}/dag/forward-cone/{nodeKey}
+GET    /api/items/{partNumber}/dag/dirty
+PUT    /api/items/{partNumber}/dag
+POST   /api/items/{partNumber}/dag/mark-dirty/{nodeKey}
+```
+
+### 3.11 `solver`
+
+```
+GET    /api/solver/jobs
+GET    /api/solver/jobs/{jobID}
+POST   /api/solver/jobs
+POST   /api/solver/jobs/{jobID}/cancel
+GET    /api/solver/solvers
+GET    /api/solver/results/{partNumber}
+```
+
+### 3.12 `sessions`
+
+```
+# Workstation management
+GET    /api/workstations
+POST   /api/workstations
+DELETE /api/workstations/{workstationID}
+
+# Edit sessions (user-scoped)
+GET    /api/edit-sessions
+
+# Edit sessions (item-scoped)
+GET    /api/items/{partNumber}/edit-sessions
+POST   /api/items/{partNumber}/edit-sessions
+DELETE /api/items/{partNumber}/edit-sessions/{sessionID}
+```
+
+---
+
+## 4. Disabled Module Behavior
+
+When a module is disabled:
+
+1. **API routes** registered by that module return `404 Not Found` with body `{"error": "module '<id>' is not enabled"}`.
+2. **Web UI** hides the module's navigation entry, page, and any inline UI elements (e.g., project tags on item cards).
+3. **SSE events** from the module are not broadcast.
+4. **Background goroutines** (e.g., job timeout sweeper, runner heartbeat checker) are not started.
+5. **Database tables** are not dropped — they remain for re-enablement. No data loss on disable/enable cycle.
+
+Implementation: each module's route group is wrapped in a middleware check:
+
+```go
+func RequireModule(id string) func(http.Handler) http.Handler {
+    return func(next http.Handler) http.Handler {
+        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+            if !modules.IsEnabled(id) {
+                http.Error(w, `{"error":"module '`+id+`' is not enabled"}`, 404)
+                return
+            }
+            next.ServeHTTP(w, r)
+        })
+    }
+}
+```
+
+---
+
+## 5. Configuration Persistence
+
+### 5.1 Precedence
+
+```
+Environment variables  (highest — always wins, secrets live here)
+        ↓
+Database overrides     (admin UI writes here)
+        ↓
+config.yaml            (lowest — bootstrap defaults)
+```
+
+### 5.2 Database Table
+
+```sql
+-- Migration 014_settings.sql
+CREATE TABLE settings_overrides (
+    key         TEXT PRIMARY KEY,          -- dotted path: "auth.ldap.enabled"
+    value       JSONB NOT NULL,           -- typed value
+    updated_by  TEXT NOT NULL,            -- username
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE module_state (
+    module_id   TEXT PRIMARY KEY,         -- "auth", "projects", etc.
+    enabled     BOOLEAN NOT NULL,
+    updated_by  TEXT NOT NULL,
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+```
+
+### 5.3 Load Sequence
+
+On startup:
+
+1. Parse `config.yaml` into Go config struct.
+2. Query `settings_overrides` — merge each key into the struct using dotted path resolution.
+3. Apply environment variable overrides (existing `SILO_*` vars).
+4. Query `module_state` — override default enabled/disabled from YAML.
+5. Validate module dependencies.
+6. Register only enabled modules' route groups.
+7. Start only enabled modules' background goroutines.
+
+### 5.4 Runtime Updates
+
+When an admin saves settings via `PUT /api/admin/settings/{module}`:
+
+1. Validate the payload against the module's config schema.
+2. Write changed keys to `settings_overrides`.
+3. Update `module_state` if `enabled` changed.
+4. Apply changes to the in-memory config (hot reload where safe).
+5. Broadcast `settings.changed` SSE event with `{module, enabled, changed_keys}`.
+6. For changes that require restart (e.g., `server.port`, `database.*`), return a `restart_required: true` flag in the response. The UI shows a banner.
+
+### 5.5 What Requires Restart
+
+| Config Area | Hot Reload | Restart Required |
+|-------------|-----------|------------------|
+| Module enable/disable | Yes | No |
+| `auth.*` provider toggles | Yes | No |
+| `auth.cors.allowed_origins` | Yes | No |
+| `odoo.*` connection settings | Yes | No |
+| `freecad.*` | Yes | No |
+| `jobs.*` timeouts, directory | Yes | No |
+| `server.host`, `server.port` | No | Yes |
+| `database.*` | No | Yes |
+| `storage.*` | No | Yes |
+| `schemas.directory` | No | Yes |
+
+---
+
+## 6. Public Module Discovery Endpoint
+
+```
+GET /api/modules
+```
+
+**No authentication required.** Clients need this pre-login to know whether OIDC is available, whether projects exist, etc.
+
+### 6.1 Response
+
+```json
+{
+  "modules": {
+    "core": {
+      "enabled": true,
+      "required": true,
+      "name": "Core PDM",
+      "version": "0.2"
+    },
+    "schemas": {
+      "enabled": true,
+      "required": true,
+      "name": "Schemas"
+    },
+    "storage": {
+      "enabled": true,
+      "required": true,
+      "name": "Storage"
+    },
+    "auth": {
+      "enabled": true,
+      "required": false,
+      "name": "Authentication",
+      "config": {
+        "local_enabled": true,
+        "ldap_enabled": true,
+        "oidc_enabled": true,
+        "oidc_issuer_url": "https://keycloak.example.com/realms/silo"
+      }
+    },
+    "projects": {
+      "enabled": true,
+      "required": false,
+      "name": "Projects"
+    },
+    "audit": {
+      "enabled": true,
+      "required": false,
+      "name": "Audit"
+    },
+    "odoo": {
+      "enabled": false,
+      "required": false,
+      "name": "Odoo ERP"
+    },
+    "freecad": {
+      "enabled": true,
+      "required": false,
+      "name": "Create Integration",
+      "config": {
+        "uri_scheme": "silo"
+      }
+    },
+    "jobs": {
+      "enabled": false,
+      "required": false,
+      "name": "Job Queue"
+    },
+    "dag": {
+      "enabled": false,
+      "required": false,
+      "name": "Dependency DAG",
+      "depends_on": ["jobs"]
+    },
+    "solver": {
+      "enabled": false,
+      "required": false,
+      "name": "Solver",
+      "depends_on": ["jobs"]
+    },
+    "sessions": {
+      "enabled": true,
+      "required": false,
+      "name": "Sessions",
+      "depends_on": ["auth"]
+    }
+  },
+  "server": {
+    "version": "0.2",
+    "read_only": false
+  }
+}
+```
+
+The `config` sub-object exposes only public, non-secret metadata needed by clients. Never includes passwords, tokens, or secret keys.
+
+---
+
+## 7. Admin Settings Endpoints
+
+### 7.1 Get All Settings
+
+```
+GET /api/admin/settings
+Authorization: Bearer <admin token>
+```
+
+Returns full config grouped by module with secrets redacted:
+
+```json
+{
+  "core": {
+    "server": {
+      "host": "0.0.0.0",
+      "port": 8080,
+      "base_url": "https://silo.example.com",
+      "read_only": false
+    }
+  },
+  "schemas": {
+    "directory": "/etc/silo/schemas",
+    "default": "kindred-rd"
+  },
+  "storage": {
+    "backend": "filesystem",
+    "filesystem": {
+      "root_dir": "/var/lib/silo/data"
+    },
+    "status": "connected"
+  },
+  "database": {
+    "host": "postgres",
+    "port": 5432,
+    "name": "silo",
+    "user": "silo",
+    "password": "****",
+    "sslmode": "disable",
+    "max_connections": 10,
+    "status": "connected"
+  },
+  "auth": {
+    "enabled": true,
+    "session_secret": "****",
+    "local": { "enabled": true },
+    "ldap": {
+      "enabled": true,
+      "url": "ldaps://ipa.example.com",
+      "base_dn": "dc=kindred,dc=internal",
+      "user_search_dn": "cn=users,cn=accounts,dc=kindred,dc=internal",
+      "bind_password": "****",
+      "role_mapping": { "...": "..." }
+    },
+    "oidc": {
+      "enabled": true,
+      "issuer_url": "https://keycloak.example.com/realms/silo",
+      "client_id": "silo",
+      "client_secret": "****",
+      "redirect_url": "https://silo.example.com/auth/callback"
+    },
+    "cors": { "allowed_origins": ["https://silo.example.com"] }
+  },
+  "projects": { "enabled": true },
+  "audit": { "enabled": true },
+  "odoo": { "enabled": false, "url": "", "database": "", "username": "" },
+  "freecad": { "uri_scheme": "silo", "executable": "" },
+  "jobs": {
+    "enabled": false,
+    "directory": "/etc/silo/jobdefs",
+    "runner_timeout": 90,
+    "job_timeout_check": 30,
+    "default_priority": 100
+  },
+  "dag": { "enabled": false },
+  "solver": { "enabled": false, "default_solver": "ondsel" },
+  "sessions": { "enabled": true }
+}
+```
+
+### 7.2 Get Module Settings
+
+```
+GET /api/admin/settings/{module}
+```
+
+Returns just the module's config block.
+
+### 7.3 Update Module Settings
+
+```
+PUT /api/admin/settings/{module}
+Content-Type: application/json
+
+{
+  "enabled": true,
+  "ldap": {
+    "enabled": true,
+    "url": "ldaps://ipa.example.com"
+  }
+}
+```
+
+**Response:**
+
+```json
+{
+  "updated": ["auth.ldap.enabled", "auth.ldap.url"],
+  "restart_required": false
+}
+```
+
+### 7.4 Test Connectivity
+
+```
+POST /api/admin/settings/{module}/test
+```
+
+Available for modules with external connections:
+
+| Module | Test Action |
+|--------|------------|
+| `storage` | Verify filesystem storage directory is accessible |
+| `auth` (ldap) | Attempt LDAP bind with configured credentials |
+| `auth` (oidc) | Fetch OIDC discovery document from issuer URL |
+| `odoo` | Attempt XML-RPC connection to Odoo |
+
+**Response:**
+
+```json
+{
+  "success": true,
+  "message": "LDAP bind successful",
+  "latency_ms": 42
+}
+```
+
+---
+
+## 8. Config YAML Changes
+
+The existing `config.yaml` gains a `modules` section. Existing top-level keys remain for backward compatibility — the module system reads from both locations.
+
+```yaml
+# Existing keys (unchanged, still work)
+server:
+  host: "0.0.0.0"
+  port: 8080
+
+database:
+  host: postgres
+  port: 5432
+  name: silo
+  user: silo
+  password: silodev
+  sslmode: disable
+
+storage:
+  backend: filesystem
+  filesystem:
+    root_dir: /var/lib/silo/data
+
+schemas:
+  directory: /etc/silo/schemas
+
+auth:
+  enabled: true
+  session_secret: change-me
+  local:
+    enabled: true
+
+# New: explicit module toggles (optional, defaults shown)
+modules:
+  projects:
+    enabled: true
+  audit:
+    enabled: true
+  odoo:
+    enabled: false
+  freecad:
+    enabled: true
+    uri_scheme: silo
+  jobs:
+    enabled: false
+    directory: /etc/silo/jobdefs
+    runner_timeout: 90
+    job_timeout_check: 30
+    default_priority: 100
+  dag:
+    enabled: false
+  solver:
+    enabled: false
+    default_solver: ondsel
+  sessions:
+    enabled: true
+```
+
+If a module is not listed under `modules:`, its default enabled state from Section 2.2 applies. The `auth.enabled` field continues to control the `auth` module (no duplication under `modules:`).
+
+---
+
+## 9. SSE Events
+
+```
+settings.changed    {module, enabled, changed_keys[], updated_by}
+```
+
+Broadcast on any admin settings change. The web UI listens for this to:
+
+- Show/hide navigation entries when modules are toggled.
+- Display a "Settings updated by another admin" toast.
+- Show a "Restart required" banner when flagged.
+
+---
+
+## 10. Web UI — Admin Settings Page
+
+The Settings page (`/settings`) is restructured into sections:
+
+### 10.1 Existing (unchanged)
+
+- **Account** — username, display name, email, auth source, role badge.
+- **API Tokens** — create, list, revoke.
+
+### 10.2 New: Module Configuration (admin only)
+
+Visible only to admin users. Each module gets a collapsible card:
+
+```
+┌─────────────────────────────────────────────────────┐
+│ [toggle] Authentication                    [status] │
+├─────────────────────────────────────────────────────┤
+│                                                     │
+│  ── Local Auth ──────────────────────────────────── │
+│  Enabled: [toggle]                                  │
+│                                                     │
+│  ── LDAP / FreeIPA ──────────────────────────────── │
+│  Enabled: [toggle]                                  │
+│  URL:     [ldaps://ipa.example.com        ]         │
+│  Base DN: [dc=kindred,dc=internal         ]  [Test] │
+│                                                     │
+│  ── OIDC / Keycloak ────────────────────────────── │
+│  Enabled:    [toggle]                               │
+│  Issuer URL: [https://keycloak.example.com] [Test]  │
+│  Client ID:  [silo                        ]         │
+│                                                     │
+│  ── CORS ────────────────────────────────────────── │
+│  Allowed Origins: [tag input]                       │
+│                                                     │
+│                                          [Save]     │
+└─────────────────────────────────────────────────────┘
+```
+
+Module cards for required modules (`core`, `schemas`, `storage`) show their status and config but have no enable/disable toggle.
+
+Status indicators per module:
+
+| Status | Badge | Meaning |
+|--------|-------|---------|
+| Active | `green` | Enabled and operational |
+| Disabled | `overlay1` | Toggled off |
+| Error | `red` | Enabled but connectivity or config issue |
+| Setup Required | `yellow` | Enabled but missing required config (e.g., LDAP URL empty) |
+
+### 10.3 Infrastructure Section (admin, read-only)
+
+Shows connection status for required infrastructure:
+
+- **Database** — host, port, name, connection pool usage, status badge.
+- **Storage** — endpoint, bucket, SSL, status badge.
+
+These are read-only in the UI (setup-only via YAML/env). The "Test" button is available to verify connectivity.
+
+---
+
+## 11. Implementation Order
+
+1. **Migration 014** — `settings_overrides` and `module_state` tables.
+2. **Config loader refactor** — YAML → DB merge → env override pipeline.
+3. **Module registry** — Go struct defining all modules with metadata, dependencies, defaults.
+4. **`GET /api/modules`** — public endpoint, no auth.
+5. **`RequireModule` middleware** — gate route groups by module state.
+6. **Admin settings API** — `GET/PUT /api/admin/settings/{module}`, test endpoints.
+7. **Web UI settings page** — module cards with toggles, config forms, test buttons.
+8. **SSE integration** — `settings.changed` event broadcast.
+
+---
+
+## 12. Future Considerations
+
+- **Module manifest format** — per ROADMAP.md, each module will eventually declare routes, views, hooks, and permissions via a manifest. This spec covers the runtime module registry; the manifest format is TBD.
+- **Custom modules** — third-party modules that register against the endpoint registry. Requires the manifest contract and a plugin loading mechanism.
+- **Per-module permissions** — beyond the current role hierarchy, modules may define fine-grained scopes (e.g., `jobs:admin`, `dag:write`).
+- **Location & Inventory module** — when the Location/Inventory API is implemented (tables already exist), it becomes a new optional module.
+- **Notifications module** — per ROADMAP.md Tier 1, notifications/subscriptions will be a dedicated module.
+- **Soft interference detection** — the `sessions` module currently enforces hard interference (unique index on item + context_level + object_id). Soft interference detection (overlapping dependency cones) is planned as a follow-up.
+
+---
+
+## 13. References
+
+- [CONFIGURATION.md](CONFIGURATION.md) — Current config reference
+- [ROADMAP.md](ROADMAP.md) — Module manifest, API endpoint registry
+- [AUTH.md](AUTH.md) — Authentication architecture
+- [WORKERS.md](WORKERS.md) — Job queue system
+- [DAG.md](DAG.md) — Dependency DAG specification
+- [SPECIFICATION.md](SPECIFICATION.md) — Full endpoint listing

docs/ROADMAP.md

@@ -88,11 +88,11 @@ Everything depends on these. They define what Silo *is*.
 | Component | Description | Status |
 |-----------|-------------|--------|
 | **Core Silo** | Part/assembly storage, version control, auth, base REST API | Complete |
-| **.kc Format Spec** | File format contract between Create and Silo | Not Started |
+| **.kc Format Spec** | File format contract between Create and Silo | Complete |
 | **API Endpoint Registry** | Module discovery, dynamic UI rendering, health checks | Not Started |
 | **Web UI Shell** | App launcher, breadcrumbs, view framework, module rendering | Partial |
 | **Python Scripting Engine** | Server-side hook execution, module extension point | Not Started |
-| **Job Queue Infrastructure** | Redis/NATS shared async service for all compute modules | Not Started |
+| **Job Queue Infrastructure** | PostgreSQL-backed async job queue with runner management | Complete |
 
 ### Tier 1 -- Core Services
 
@@ -102,7 +102,7 @@ Broad downstream dependencies. These should be built early because retrofitting
 |--------|-------------|------------|--------|
 | **Headless Create** | API-driven FreeCAD instance for file manipulation, geometry queries, format conversion, rendering | Core Silo, Job Queue | Not Started |
 | **Notifications & Subscriptions** | Per-part watch lists, lifecycle event hooks, webhook delivery | Core Silo, Registry | Not Started |
-| **Audit Trail / Compliance** | ITAR, ISO 9001, AS9100 traceability; module-level event journaling | Core Silo | Partial |
+| **Audit Trail / Compliance** | ITAR, ISO 9001, AS9100 traceability; module-level event journaling | Core Silo | Complete (base) |
 
 ### Tier 2 -- File Intelligence & Collaboration
 
@@ -132,7 +132,7 @@ Process modules that formalize how engineering work moves through an organizatio
 
 | Module | Description | Depends On | Status |
 |--------|-------------|------------|--------|
-| **Approval / ECO Workflow** | Engineering change orders, multi-stage review gates, digital signatures | Notifications, Audit Trail, Schemas | Not Started |
+| **Approval / ECO Workflow** | Engineering change orders, multi-stage review gates, digital signatures | Notifications, Audit Trail, Schemas | Complete |
 | **Shop Floor Drawing Distribution** | Controlled push-to-production drawings; web-based appliance displays on the floor | Headless Create, Approval Workflow | Not Started |
 | **Import/Export Bridge** | STEP, IGES, 3MF connectors; SOLIDWORKS migration tooling; ERP adapters | Headless Create | Not Started |
 | **Multi-tenant / Org Management** | Org boundaries, role-based permissioning, storage quotas | Core Auth, Audit Trail | Not Started |
@@ -170,11 +170,11 @@ Complete MVP and stabilize core functionality.
 
 | Task | Description | Status |
 |------|-------------|--------|
-| Unit test suite | Core API, database, partnum, file, CSV/ODS handler tests | Complete (137 tests) |
+| Unit test suite | Core API, database, partnum, file, CSV/ODS handler tests | Partial (~40%) |
-| Date segment type | Implement `date` segment with strftime-style formatting | Complete (#79) |
+| Date segment type | Implement `date` segment with strftime-style formatting | Not Started |
-| Part number validation | Validate format against schema on creation | Complete (#80) |
+| Part number validation | Validate format against schema on creation | Not Started |
-| Location CRUD API | Expose location hierarchy via REST | Not Started (#81) |
+| Location CRUD API | Expose location hierarchy via REST | Not Started |
-| Inventory API | Expose inventory operations via REST | Not Started (#82) |
+| Inventory API | Expose inventory operations via REST | Not Started |
 
 **Success metrics:**
 - All existing tests pass
@@ -187,9 +187,9 @@ Enable team collaboration (feeds into Tier 1 and Tier 4).
 
 | Task | Description | Status |
 |------|-------------|--------|
-| Check-out locking | Pessimistic locks with timeout | Not Started (#87) |
+| Check-out locking | Pessimistic locks with timeout | Not Started |
-| User/group management | Create, assign, manage users and groups | Not Started (#88) |
+| User/group management | Create, assign, manage users and groups | Not Started |
-| Folder permissions | Read/write/delete per folder/project hierarchy | Not Started (#89) |
+| Folder permissions | Read/write/delete per folder hierarchy | Not Started |
 
 **Success metrics:**
 - 5+ concurrent users supported
@@ -202,15 +202,15 @@ Implement engineering change processes (Tier 4: Approval/ECO Workflow).
 
 | Task | Description | Status |
 |------|-------------|--------|
-| Workflow designer | YAML-defined state machines | Not Started |
+| Workflow designer | YAML-defined state machines | Complete |
-| State transitions | Configurable transition rules with permissions | Not Started |
+| State transitions | Configurable transition rules with permissions | Complete |
-| Approval workflows | Single and parallel approver gates | Not Started |
+| Approval workflows | Single and parallel approver gates | Complete |
 | Email notifications | SMTP integration for alerts on state changes | Not Started |
 
 **Success metrics:**
-- Engineering change process completable in Silo
+- ~~Engineering change process completable in Silo~~ Done (YAML-configured workflows with multi-stage gates)
 - Email notifications delivered reliably
-- Workflow state visible in web UI
+- ~~Workflow state visible in web UI~~ Available via API
 
 ### Search & Discovery
 
@@ -218,8 +218,8 @@ Improve findability and navigation (Tier 0 Web UI Shell).
 
 | Task | Description | Status |
 |------|-------------|--------|
-| Advanced search UI | Web interface with filters and operators | Not Started (#90) |
+| Advanced search UI | Web interface with filters and operators | Not Started |
-| Saved searches | User-defined query favorites | Not Started (#91) |
+| Saved searches | User-defined query favorites | Not Started |
 
 **Success metrics:**
 - Search returns results in <2 seconds
@@ -240,9 +240,17 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 5. ~~Multi-level BOM API~~ -- recursive expansion with configurable depth
 6. ~~BOM export~~ -- CSV and ODS formats
 
+### Recently Completed
+
+7. ~~Workflow engine~~ -- YAML-defined state machines with multi-stage approval gates
+8. ~~Job queue~~ -- PostgreSQL-backed async compute with runner management
+9. ~~Assembly solver service~~ -- server-side constraint solving with result caching
+10. ~~Workstation registration~~ -- device identity and heartbeat tracking
+11. ~~Edit sessions~~ -- acquire/release with hard interference detection
+
 ### Critical Gaps (Required for Team Use)
 
-1. **Workflow engine** -- state machines with transitions and approvals
+1. ~~**Workflow engine**~~ -- Complete (YAML-configured approval workflows)
 2. **Check-out locking** -- pessimistic locking for CAD files
 
 ### High Priority Gaps (Significant Value)
@@ -275,7 +283,7 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 
 1. **Module manifest format** -- JSON, TOML, or Python-based? Tradeoffs between simplicity and expressiveness.
 2. **.kc thumbnail policy** -- Single canonical thumbnail vs. multi-view renders. Impacts file size and generation cost.
-3. **Job queue technology** -- Redis Streams vs. NATS. Redis is already in the stack; NATS offers better pub/sub semantics for event-driven modules.
+3. ~~**Job queue technology**~~ -- Resolved: PostgreSQL-backed with `SELECT FOR UPDATE SKIP LOCKED` for exactly-once delivery. No external queue dependency.
 4. **Headless Create deployment** -- Sidecar container per Silo instance, or pool of workers behind the job queue?
 5. **BIM-MES workbench scope** -- How much of FreeCAD BIM is reusable vs. needs to be purpose-built for inventory/facility modeling?
 6. **Offline .kc workflow** -- How much of the `silo/` metadata is authoritative when disconnected? Reconciliation strategy on reconnect.
@@ -287,7 +295,7 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 ### Implemented Features (MVP Complete)
 
 #### Core Database System
-- PostgreSQL schema with 13 migrations
+- PostgreSQL schema with 23 migrations
 - UUID-based identifiers throughout
 - Soft delete support via `archived_at` timestamps
 - Atomic sequence generation for part numbers
@@ -313,7 +321,7 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 - Rollback functionality
 
 #### File Management
-- MinIO integration with versioning
+- Filesystem-based file storage
 - File upload/download via REST API
 - SHA256 checksums for integrity
 - Storage path: `items/{partNumber}/rev{N}.FCStd`
@@ -340,7 +348,7 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 - Template generation for import formatting
 
 #### API & Web Interface
-- REST API with 78 endpoints
+- REST API with ~140 endpoints
 - Authentication: local (bcrypt), LDAP/FreeIPA, OIDC/Keycloak
 - Role-based access control (admin > editor > viewer)
 - API token management (SHA-256 hashed)
@@ -367,18 +375,18 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 | Feature | Status | Notes |
 |---------|--------|-------|
 | Odoo ERP integration | Partial | Config and sync-log CRUD functional; push/pull sync operations are stubs |
-| Date segment type | Complete | strftime-style formatting via Go time layout (#79) |
+| Date segment type | Not started | Schema parser placeholder exists |
-| Part number validation | Complete | Validates against schema on creation (#80) |
+| Part number validation | Not started | API accepts but doesn't validate format |
-| Location hierarchy CRUD | Schema only | Tables exist, no API endpoints (#81) |
+| Location hierarchy CRUD | Schema only | Tables exist, no API endpoints |
-| Inventory tracking | Schema only | Tables exist, no API endpoints (#82) |
+| Inventory tracking | Schema only | Tables exist, no API endpoints |
-| Unit tests | Complete | 137 tests across 20 files covering api, db, ods, partnum, schema packages |
+| Unit tests | Partial | 31 Go test files across api, db, modules, ods, partnum, schema packages |
 
 ---
 
 ## Appendix B: Phase 1 Detailed Tasks
 
-### 1.1 MinIO Integration -- COMPLETE
+### 1.1 File Storage -- COMPLETE
-- [x] MinIO service configured in Docker Compose
+- [x] Filesystem storage backend
 - [x] File upload via REST API
 - [x] File download via REST API (latest and by revision)
 - [x] SHA256 checksums on upload
@@ -400,21 +408,18 @@ For full SOLIDWORKS PDM comparison tables, see [GAP_ANALYSIS.md Appendix C](GAP_
 - [x] BOM ODS export
 - [x] ODS item export/import/template
 
-### 1.4 Unit Test Suite -- COMPLETE
+### 1.4 Unit Test Suite
-- [x] Database connection and transaction tests
+- [ ] Database connection and transaction tests
-- [x] Item CRUD operation tests (including edge cases: duplicate keys, pagination, search)
+- [ ] Item CRUD operation tests
-- [x] Revision creation, retrieval, compare, rollback tests
+- [ ] Revision creation and retrieval tests
-- [x] Part number generation tests (including date segments, validation)
+- [ ] Part number generation tests
-- [x] File upload/download handler tests
+- [ ] File upload/download tests
-- [x] CSV import/export tests (dry-run, commit, BOM export)
+- [ ] CSV import/export tests
-- [x] ODS import/export tests (export, template, project sheet)
+- [ ] API endpoint tests
-- [x] API endpoint tests (revisions, schemas, audit, auth tokens)
-- [x] Item file CRUD tests
-- [x] BOM handler tests (get, flat, cost, add, delete)
 
-### 1.5 Missing Segment Types -- COMPLETE
+### 1.5 Missing Segment Types
-- [x] Implement date segment type
+- [ ] Implement date segment type
-- [x] Add strftime-style format support
+- [ ] Add strftime-style format support
 
 ### 1.6 Location & Inventory APIs
 - [ ] `GET /api/locations` - List locations

docs/SOLVER.md

@@ -0,0 +1,912 @@
+# Solver Service Specification
+
+**Status:** Phase 3b Implemented (server endpoints, job definitions, result cache)
+**Last Updated:** 2026-03-01
+**Depends on:** KCSolve Phase 1 (PR #297), Phase 2 (PR #298)
+**Prerequisite infrastructure:** Job queue, runner system, and SSE broadcasting are fully implemented (see [WORKERS.md](WORKERS.md), migration `015_jobs_runners.sql`, `cmd/silorunner/`).
+
+---
+
+## 1. Overview
+
+The solver service extends Silo's job queue system with assembly constraint solving capabilities. It enables server-side solving of assemblies stored in Silo, with results streamed back to clients in real time via SSE.
+
+This specification describes how the existing KCSolve client-side API (C++ library + pybind11 `kcsolve` module) integrates with Silo's worker infrastructure to provide headless, asynchronous constraint solving.
+
+### 1.1 Goals
+
+1. **Offload solving** -- Move heavy solve operations off the user's machine to server workers.
+2. **Batch validation** -- Automatically validate assemblies on commit (e.g. check for over-constrained systems).
+3. **Solver selection** -- Allow the server to run different solvers than the client (e.g. a more thorough solver for validation, a fast one for interactive editing).
+4. **Standalone execution** -- Solver workers can run without a full FreeCAD installation, using just the `kcsolve` Python module and the `.kc` file.
+
+### 1.2 Non-Goals
+
+- **Interactive drag** -- Real-time drag solving stays client-side (latency-sensitive).
+- **Geometry processing** -- Workers don't compute geometry; they receive pre-extracted constraint graphs.
+- **Solver development** -- Writing new solver backends is out of scope; this spec covers the transport and execution layer.
+
+---
+
+## 2. Architecture
+
+```
+                          ┌─────────────────────┐
+                          │   Kindred Create     │
+                          │   (FreeCAD client)   │
+                          └───────┬──────────────┘
+                                  │ 1. POST /api/solver/jobs
+                                  │    (SolveContext JSON)
+                                  │
+                                  │ 4. GET /api/events (SSE)
+                                  │    job.progress, job.completed
+                                  ▼
+                          ┌─────────────────────┐
+                          │   Silo Server        │
+                          │   (silod)            │
+                          │                     │
+                          │   solver module      │
+                          │   REST + SSE + queue  │
+                          └───────┬──────────────┘
+                                  │ 2. POST /api/runner/claim
+                                  │ 3. POST /api/runner/jobs/{id}/complete
+                                  ▼
+                          ┌─────────────────────┐
+                          │   Solver Runner      │
+                          │   (silorunner)       │
+                          │                     │
+                          │   kcsolve module     │
+                          │   OndselAdapter      │
+                          │   Python solvers     │
+                          └─────────────────────┘
+```
+
+### 2.1 Components
+
+| Component | Role | Deployment |
+|-----------|------|------------|
+| **Silo server** | Job queue management, REST API, SSE broadcast, result storage | Existing `silod` binary (jobs module, migration 015) |
+| **Solver runner** | Claims solver jobs, executes `kcsolve`, reports results | Existing `silorunner` binary (`cmd/silorunner/`) with `solver` tag |
+| **kcsolve module** | Python/C++ solver library (Phase 1+2) | Installed on runner nodes |
+| **Create client** | Submits jobs, receives results via SSE | Existing FreeCAD client |
+
+### 2.2 Module Registration
+
+The solver service is a Silo module with ID `solver`, gated behind the existing module system:
+
+```yaml
+# config.yaml
+modules:
+  solver:
+    enabled: true
+```
+
+It depends on the `jobs` module being enabled. All solver endpoints return `404` with `{"error": "module not enabled"}` when disabled.
+
+---
+
+## 3. Data Model
+
+### 3.1 SolveContext JSON Schema
+
+The `SolveContext` is the input to a solve operation. Currently it exists only as a C++ struct and pybind11 binding with no serialization. Phase 3 adds JSON serialization to enable server transport.
+
+```json
+{
+  "api_version": 1,
+  "parts": [
+    {
+      "id": "Part001",
+      "placement": {
+        "position": [0.0, 0.0, 0.0],
+        "quaternion": [1.0, 0.0, 0.0, 0.0]
+      },
+      "mass": 1.0,
+      "grounded": true
+    },
+    {
+      "id": "Part002",
+      "placement": {
+        "position": [100.0, 0.0, 0.0],
+        "quaternion": [1.0, 0.0, 0.0, 0.0]
+      },
+      "mass": 1.0,
+      "grounded": false
+    }
+  ],
+  "constraints": [
+    {
+      "id": "Joint001",
+      "part_i": "Part001",
+      "marker_i": {
+        "position": [50.0, 0.0, 0.0],
+        "quaternion": [1.0, 0.0, 0.0, 0.0]
+      },
+      "part_j": "Part002",
+      "marker_j": {
+        "position": [0.0, 0.0, 0.0],
+        "quaternion": [1.0, 0.0, 0.0, 0.0]
+      },
+      "type": "Revolute",
+      "params": [],
+      "limits": [],
+      "activated": true
+    }
+  ],
+  "motions": [],
+  "simulation": null,
+  "bundle_fixed": false
+}
+```
+
+**Field reference:** See [KCSolve Python API](../reference/kcsolve-python.md) for full field documentation. The JSON schema maps 1:1 to the Python/C++ types.
+
+**Enum serialization:** Enums serialize as strings matching their Python names (e.g. `"Revolute"`, `"Success"`, `"Redundant"`).
+
+**Transform shorthand:** The `placement` and `marker_*` fields use the `Transform` struct: `position` is `[x, y, z]`, `quaternion` is `[w, x, y, z]`.
+
+**Constraint.Limit:**
+```json
+{
+  "kind": "RotationMin",
+  "value": -1.5708,
+  "tolerance": 1e-9
+}
+```
+
+**MotionDef:**
+```json
+{
+  "kind": "Rotational",
+  "joint_id": "Joint001",
+  "marker_i": "",
+  "marker_j": "",
+  "rotation_expr": "2*pi*t",
+  "translation_expr": ""
+}
+```
+
+**SimulationParams:**
+```json
+{
+  "t_start": 0.0,
+  "t_end": 2.0,
+  "h_out": 0.04,
+  "h_min": 1e-9,
+  "h_max": 1.0,
+  "error_tol": 1e-6
+}
+```
+
+### 3.2 SolveResult JSON Schema
+
+```json
+{
+  "status": "Success",
+  "placements": [
+    {
+      "id": "Part002",
+      "placement": {
+        "position": [50.0, 0.0, 0.0],
+        "quaternion": [0.707, 0.0, 0.707, 0.0]
+      }
+    }
+  ],
+  "dof": 1,
+  "diagnostics": [
+    {
+      "constraint_id": "Joint003",
+      "kind": "Redundant",
+      "detail": "6 DOF removed by Joint003 are already constrained"
+    }
+  ],
+  "num_frames": 0
+}
+```
+
+### 3.3 Solver Job Record
+
+Solver jobs are stored in the existing `jobs` table. The solver-specific data is in the `args` and `result` JSONB columns.
+
+**Job args (input):**
+```json
+{
+  "solver": "ondsel",
+  "operation": "solve",
+  "context": { /* SolveContext JSON */ },
+  "item_part_number": "ASM-001",
+  "revision_number": 3
+}
+```
+
+**Operation types:**
+| Operation | Description | Requires simulation? |
+|-----------|-------------|---------------------|
+| `solve` | Static equilibrium solve | No |
+| `diagnose` | Constraint analysis only (no placement update) | No |
+| `kinematic` | Time-domain kinematic simulation | Yes |
+
+**Job result (output):**
+```json
+{
+  "result": { /* SolveResult JSON */ },
+  "solver_name": "OndselSolver (Lagrangian)",
+  "solver_version": "1.0",
+  "solve_time_ms": 127.4
+}
+```
+
+---
+
+## 4. REST API
+
+All endpoints are prefixed with `/api/solver/` and gated behind `RequireModule("solver")`.
+
+### 4.1 Submit Solve Job
+
+```
+POST /api/solver/jobs
+Authorization: Bearer silo_...
+Content-Type: application/json
+
+{
+  "solver": "ondsel",
+  "operation": "solve",
+  "context": { /* SolveContext */ },
+  "priority": 50
+}
+```
+
+**Optional fields:**
+| Field | Type | Default | Description |
+|-------|------|---------|-------------|
+| `solver` | string | `""` (default solver) | Solver name from registry |
+| `operation` | string | `"solve"` | `solve`, `diagnose`, or `kinematic` |
+| `context` | object | required | SolveContext JSON |
+| `priority` | int | `50` | Lower = higher priority |
+| `item_part_number` | string | `null` | Silo item reference (for result association) |
+| `revision_number` | int | `null` | Revision that generated this context |
+| `callback_url` | string | `null` | Webhook URL for completion notification |
+
+**Response `201 Created`:**
+```json
+{
+  "job_id": "550e8400-e29b-41d4-a716-446655440000",
+  "status": "pending",
+  "created_at": "2026-02-19T18:30:00Z"
+}
+```
+
+**Error responses:**
+| Code | Condition |
+|------|-----------|
+| `400` | Invalid SolveContext (missing required fields, unknown enum values) |
+| `401` | Not authenticated |
+| `404` | Module not enabled |
+| `422` | Unknown solver name, invalid operation |
+
+### 4.2 Get Job Status
+
+```
+GET /api/solver/jobs/{jobID}
+```
+
+**Response `200 OK`:**
+```json
+{
+  "job_id": "550e8400-...",
+  "status": "completed",
+  "operation": "solve",
+  "solver": "ondsel",
+  "priority": 50,
+  "item_part_number": "ASM-001",
+  "revision_number": 3,
+  "runner_id": "runner-01",
+  "runner_name": "solver-worker-01",
+  "created_at": "2026-02-19T18:30:00Z",
+  "claimed_at": "2026-02-19T18:30:01Z",
+  "completed_at": "2026-02-19T18:30:02Z",
+  "result": {
+    "result": { /* SolveResult */ },
+    "solver_name": "OndselSolver (Lagrangian)",
+    "solve_time_ms": 127.4
+  }
+}
+```
+
+### 4.3 List Solver Jobs
+
+```
+GET /api/solver/jobs?status=completed&item=ASM-001&limit=20&offset=0
+```
+
+**Query parameters:**
+| Param | Type | Description |
+|-------|------|-------------|
+| `status` | string | Filter by status: `pending`, `claimed`, `running`, `completed`, `failed` |
+| `item` | string | Filter by item part number |
+| `operation` | string | Filter by operation type |
+| `solver` | string | Filter by solver name |
+| `limit` | int | Page size (default 20, max 100) |
+| `offset` | int | Pagination offset |
+
+**Response `200 OK`:**
+```json
+{
+  "jobs": [ /* array of job objects */ ],
+  "total": 42,
+  "limit": 20,
+  "offset": 0
+}
+```
+
+### 4.4 Cancel Job
+
+```
+POST /api/solver/jobs/{jobID}/cancel
+```
+
+Only `pending` and `claimed` jobs can be cancelled. Running jobs must complete or time out.
+
+**Response `200 OK`:**
+```json
+{
+  "job_id": "550e8400-...",
+  "status": "cancelled"
+}
+```
+
+### 4.5 Get Solver Registry
+
+```
+GET /api/solver/solvers
+```
+
+Returns available solvers on registered runners. Runners report their solver capabilities during heartbeat.
+
+**Response `200 OK`:**
+```json
+{
+  "solvers": [
+    {
+      "name": "ondsel",
+      "display_name": "OndselSolver (Lagrangian)",
+      "deterministic": true,
+      "supported_joints": [
+        "Coincident", "Fixed", "Revolute", "Cylindrical",
+        "Slider", "Ball", "Screw", "Gear", "RackPinion",
+        "Parallel", "Perpendicular", "Angle", "Planar",
+        "Concentric", "PointOnLine", "PointInPlane",
+        "LineInPlane", "Tangent", "DistancePointPoint",
+        "DistanceCylSph", "Universal"
+      ],
+      "runner_count": 2
+    }
+  ],
+  "default_solver": "ondsel"
+}
+```
+
+---
+
+## 5. Server-Sent Events
+
+Solver jobs emit events on the existing `/api/events` SSE stream.
+
+### 5.1 Event Types
+
+Solver jobs use the existing `job.*` SSE event prefix (see [WORKERS.md](WORKERS.md)). Clients filter on `definition_name` to identify solver-specific events.
+
+| Event | Payload | When |
+|-------|---------|------|
+| `job.created` | `{job_id, definition_name, trigger, item_id}` | Job submitted |
+| `job.claimed` | `{job_id, runner_id, runner}` | Runner claims work |
+| `job.progress` | `{job_id, progress, message}` | Progress update (0-100) |
+| `job.completed` | `{job_id, runner_id}` | Job succeeded |
+| `job.failed` | `{job_id, runner_id, error}` | Job failed |
+
+### 5.2 Example Stream
+
+```
+event: job.created
+data: {"job_id":"abc-123","definition_name":"assembly-solve","trigger":"manual","item_id":"uuid-..."}
+
+event: job.claimed
+data: {"job_id":"abc-123","runner_id":"r1","runner":"solver-worker-01"}
+
+event: job.progress
+data: {"job_id":"abc-123","progress":50,"message":"Building constraint system..."}
+
+event: job.completed
+data: {"job_id":"abc-123","runner_id":"r1"}
+```
+
+### 5.3 Client Integration
+
+The Create client subscribes to the SSE stream and updates the Assembly workbench UI:
+
+1. **Silo viewport widget** shows job status indicator (pending/running/done/failed)
+2. On `job.completed` (where `definition_name` starts with `assembly-`), the client fetches the full result via `GET /api/jobs/{id}` and applies placements
+3. On `job.failed`, the client shows the error in the report panel
+4. Diagnostic results (redundant/conflicting constraints) surface in the constraint tree
+
+---
+
+## 6. Runner Integration
+
+### 6.1 Runner Requirements
+
+Solver runners are standard `silorunner` instances (see `cmd/silorunner/main.go`) registered with the `solver` tag. The existing runner binary already handles the full job lifecycle (claim, start, progress, complete/fail, log, DAG sync). Solver support requires adding `solver-run`, `solver-diagnose`, and `solver-kinematic` to the runner's command dispatch (currently handles `create-validate`, `create-export`, `create-dag-extract`, `create-thumbnail`).
+
+Additional requirements on the runner host:
+
+- Python 3.11+ with `kcsolve` module installed
+- `libKCSolve.so` and solver backend libraries (e.g. `libOndselSolver.so`)
+- Network access to the Silo server
+
+No FreeCAD installation is required. The runner operates on pre-extracted `SolveContext` JSON.
+
+### 6.2 Runner Registration
+
+```bash
+# Register a solver runner (admin)
+curl -X POST https://silo.example.com/api/runners \
+  -H "Authorization: Bearer admin_token" \
+  -d '{"name":"solver-01","tags":["solver"]}'
+
+# Response includes one-time token
+{"id":"uuid","token":"silo_runner_xyz..."}
+```
+
+### 6.3 Runner Heartbeat and Capabilities
+
+The existing heartbeat endpoint (`POST /api/runner/heartbeat`) takes no body — it updates `last_heartbeat` on every authenticated request via the `RequireRunnerAuth` middleware. Runners that go 90 seconds without a request are marked offline by the background sweeper.
+
+Solver capabilities are reported via the runner's `metadata` JSONB field, set at registration time:
+
+```bash
+curl -X POST https://silo.example.com/api/runners \
+  -H "Authorization: Bearer admin_token" \
+  -d '{
+    "name": "solver-01",
+    "tags": ["solver"],
+    "metadata": {
+      "solvers": ["ondsel"],
+      "api_version": 1,
+      "python_version": "3.11.11"
+    }
+  }'
+```
+
+> **Future enhancement:** The heartbeat endpoint could be extended to accept an optional body for dynamic capability updates, but currently capabilities are static per registration.
+
+### 6.4 Runner Execution Flow
+
+```python
+#!/usr/bin/env python3
+"""Solver runner entry point."""
+
+import json
+import kcsolve
+
+
+def execute_solve_job(args: dict) -> dict:
+    """Execute a solver job from parsed args."""
+    solver_name = args.get("solver", "")
+    operation = args.get("operation", "solve")
+    ctx_dict = args["context"]
+
+    # Deserialize SolveContext from JSON
+    ctx = kcsolve.SolveContext.from_dict(ctx_dict)
+
+    # Load solver
+    solver = kcsolve.load(solver_name)
+    if solver is None:
+        raise ValueError(f"Unknown solver: {solver_name!r}")
+
+    # Execute operation
+    if operation == "solve":
+        result = solver.solve(ctx)
+    elif operation == "diagnose":
+        diags = solver.diagnose(ctx)
+        result = kcsolve.SolveResult()
+        result.diagnostics = diags
+    elif operation == "kinematic":
+        result = solver.run_kinematic(ctx)
+    else:
+        raise ValueError(f"Unknown operation: {operation!r}")
+
+    # Serialize result
+    return {
+        "result": result.to_dict(),
+        "solver_name": solver.name(),
+        "solver_version": "1.0",
+    }
+```
+
+### 6.5 Standalone Process Mode
+
+For minimal deployments, the runner can invoke a standalone solver process:
+
+```bash
+echo '{"solver":"ondsel","operation":"solve","context":{...}}' | \
+  python3 -m kcsolve.runner
+```
+
+The `kcsolve.runner` module reads JSON from stdin, executes the solve, and writes the result JSON to stdout. Exit code 0 = success, non-zero = failure with error JSON on stderr.
+
+---
+
+## 7. Job Definitions
+
+### 7.1 Manual Solve Job
+
+Triggered by the client when the user requests a server-side solve.
+
+> **Note:** The `compute.type` uses `custom` because the valid types in `internal/jobdef/jobdef.go` are: `validate`, `rebuild`, `diff`, `export`, `custom`. Solver commands are dispatched by the runner based on the `command` field.
+
+```yaml
+job:
+  name: assembly-solve
+  version: 1
+  description: "Solve assembly constraints on server"
+
+  trigger:
+    type: manual
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-run
+
+  runner:
+    tags: [solver]
+
+  timeout: 300
+  max_retries: 1
+  priority: 50
+```
+
+### 7.2 Commit-Time Validation
+
+Automatically validates assembly constraints when a new revision is committed:
+
+```yaml
+job:
+  name: assembly-validate
+  version: 1
+  description: "Validate assembly constraints on commit"
+
+  trigger:
+    type: revision_created
+    filter:
+      item_type: assembly
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-diagnose
+    args:
+      operation: diagnose
+
+  runner:
+    tags: [solver]
+
+  timeout: 120
+  max_retries: 2
+  priority: 75
+```
+
+### 7.3 Kinematic Simulation
+
+Server-side kinematic simulation for assemblies with motion definitions:
+
+```yaml
+job:
+  name: assembly-kinematic
+  version: 1
+  description: "Run kinematic simulation"
+
+  trigger:
+    type: manual
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-kinematic
+    args:
+      operation: kinematic
+
+  runner:
+    tags: [solver]
+
+  timeout: 1800
+  max_retries: 0
+  priority: 100
+```
+
+---
+
+## 8. SolveContext Extraction
+
+When a solver job is triggered by a revision commit (rather than a direct context submission), the server or runner must extract a `SolveContext` from the `.kc` file.
+
+### 8.1 Extraction via Headless Create
+
+For full-fidelity extraction that handles geometry classification:
+
+```bash
+create --console -e "
+import kcsolve_extract
+kcsolve_extract.extract_and_solve('input.kc', 'output.json', solver='ondsel')
+"
+```
+
+This requires a full Create installation on the runner and uses the Assembly module's existing adapter layer to build `SolveContext` from document objects.
+
+### 8.2 Extraction from .kc Silo Directory
+
+For lightweight extraction without FreeCAD, the constraint graph can be stored in the `.kc` archive's `silo/` directory during commit:
+
+```
+silo/solver/context.json    # Pre-extracted SolveContext
+silo/solver/result.json     # Last solve result (if any)
+```
+
+The client extracts the `SolveContext` locally before committing the `.kc` file. The server reads it from the archive, avoiding the need for geometry processing on the runner.
+
+**Commit-time packing** (client side):
+```python
+# In the Assembly workbench commit hook:
+ctx = assembly_object.build_solve_context()
+kc_archive.write("silo/solver/context.json", ctx.to_json())
+```
+
+**Runner-side extraction:**
+```python
+import zipfile, json
+
+with zipfile.ZipFile("assembly.kc") as zf:
+    ctx_json = json.loads(zf.read("silo/solver/context.json"))
+```
+
+---
+
+## 9. Database Schema
+
+### 9.1 Migration
+
+The solver module uses the existing `jobs` table. One new table is added for result caching:
+
+```sql
+-- Migration: 021_solver_results.sql
+
+CREATE TABLE solver_results (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    revision_number INTEGER NOT NULL,
+    job_id UUID REFERENCES jobs(id) ON DELETE SET NULL,
+    operation TEXT NOT NULL,         -- 'solve', 'diagnose', 'kinematic'
+    solver_name TEXT NOT NULL,
+    status TEXT NOT NULL,            -- SolveStatus string
+    dof INTEGER,
+    diagnostics JSONB DEFAULT '[]',
+    placements JSONB DEFAULT '[]',
+    num_frames INTEGER DEFAULT 0,
+    solve_time_ms DOUBLE PRECISION,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE(item_id, revision_number, operation)
+);
+
+CREATE INDEX idx_solver_results_item ON solver_results(item_id);
+CREATE INDEX idx_solver_results_status ON solver_results(status);
+```
+
+The `UNIQUE(item_id, revision_number, operation)` constraint means each revision has at most one result per operation type. Re-running overwrites the previous result.
+
+### 9.2 Result Association
+
+When a solver job completes, the server:
+1. Stores the full result in the `jobs.result` JSONB column (standard job result)
+2. Upserts a row in `solver_results` for quick lookup by item/revision
+3. Broadcasts `job.completed` SSE event
+
+---
+
+## 10. Configuration
+
+### 10.1 Server Config
+
+```yaml
+# config.yaml
+modules:
+  solver:
+    enabled: true
+    default_solver: "ondsel"
+    max_context_size_mb: 10       # Reject oversized SolveContext payloads
+    default_timeout: 300          # Default job timeout (seconds)
+    auto_diagnose_on_commit: true # Auto-submit diagnose job on revision commit
+```
+
+### 10.2 Environment Variables
+
+| Variable | Description |
+|----------|-------------|
+| `SILO_SOLVER_ENABLED` | Override module enabled state |
+| `SILO_SOLVER_DEFAULT` | Default solver name |
+
+### 10.3 Runner Config
+
+```yaml
+# runner.yaml
+server_url: https://silo.example.com
+token: silo_runner_xyz...
+tags: [solver]
+
+solver:
+  kcsolve_path: /opt/create/lib  # LD_LIBRARY_PATH for kcsolve.so
+  python: /opt/create/bin/python3
+  max_concurrent: 2              # Parallel job slots per runner
+```
+
+---
+
+## 11. Security
+
+### 11.1 Authentication
+
+All solver endpoints use the existing Silo authentication:
+- **User endpoints** (`/api/solver/jobs`): Session or API token, requires `viewer` role to read, `editor` role to submit
+- **Runner endpoints** (`/api/runner/...`): Runner token authentication (existing)
+
+### 11.2 Input Validation
+
+The server validates SolveContext JSON before queuing:
+- Maximum payload size (configurable, default 10 MB)
+- Required fields present (`parts`, `constraints`)
+- Enum values are valid strings
+- Transform arrays have correct length (position: 3, quaternion: 4)
+- No duplicate part or constraint IDs
+
+### 11.3 Runner Isolation
+
+Solver runners execute untrusted constraint data. Mitigations:
+- Runners should run in containers or sandboxed environments
+- Python solver registration (`kcsolve.register_solver()`) is disabled in runner mode
+- Solver execution has a configurable timeout (killed on expiry)
+- Result size is bounded (large kinematic simulations are truncated)
+
+---
+
+## 12. Client SDK
+
+### 12.1 Python Client
+
+The existing `silo-client` package is extended with solver methods:
+
+```python
+from silo_client import SiloClient
+
+client = SiloClient("https://silo.example.com", token="silo_...")
+
+# Submit a solve job
+import kcsolve
+ctx = kcsolve.SolveContext()
+# ... build context ...
+
+job = client.solver.submit(ctx.to_dict(), solver="ondsel")
+print(job.id, job.status)  # "pending"
+
+# Poll for completion
+result = client.solver.wait(job.id, timeout=60)
+print(result.status)  # "Success"
+
+# Or use SSE for real-time updates
+for event in client.solver.stream(job.id):
+    print(event.type, event.data)
+
+# Query results for an item
+results = client.solver.results("ASM-001")
+```
+
+### 12.2 Create Workbench Integration
+
+The Assembly workbench adds a "Solve on Server" command:
+
+```python
+# CommandSolveOnServer.py (sketch)
+def activated(self):
+    assembly = get_active_assembly()
+    ctx = assembly.build_solve_context()
+    
+    # Submit to Silo
+    from silo_client import get_client
+    client = get_client()
+    job = client.solver.submit(ctx.to_dict())
+    
+    # Subscribe to SSE for updates
+    self.watch_job(job.id)
+
+def on_solver_completed(self, job_id, result):
+    # Apply placements back to assembly
+    assembly = get_active_assembly()
+    for pr in result["placements"]:
+        assembly.set_part_placement(pr["id"], pr["placement"])
+    assembly.recompute()
+```
+
+---
+
+## 13. Implementation Plan
+
+### Phase 3a: JSON Serialization
+
+Add `to_dict()` / `from_dict()` methods to all KCSolve types in the pybind11 module.
+
+**Files to modify:**
+- `src/Mod/Assembly/Solver/bindings/kcsolve_py.cpp` -- add dict conversion methods
+
+**Verification:** `ctx.to_dict()` round-trips through `SolveContext.from_dict()`.
+
+### Phase 3b: Server Endpoints -- COMPLETE
+
+Add the solver module to the Silo server. This builds on the existing job queue infrastructure (`migration 015_jobs_runners.sql`, `internal/db/jobs.go`, `internal/api/job_handlers.go`, `internal/api/runner_handlers.go`).
+
+**Implemented files:**
+- `internal/api/solver_handlers.go` -- REST endpoint handlers (solver-specific convenience layer over existing `/api/jobs`)
+- `internal/db/migrations/021_solver_results.sql` -- Database migration for result caching table
+- Module registered as `solver` in `internal/modules/modules.go` with `jobs` dependency
+
+### Phase 3c: Runner Support
+
+Add solver command handlers to the existing `silorunner` binary (`cmd/silorunner/main.go`). The runner already implements the full job lifecycle (claim, start, progress, complete/fail). This phase adds `solver-run`, `solver-diagnose`, and `solver-kinematic` to the `executeJob` switch statement.
+
+**Files to modify:**
+- `cmd/silorunner/main.go` -- Add solver command dispatch cases
+- `src/Mod/Assembly/Solver/bindings/runner.py` -- `kcsolve.runner` Python entry point (invoked by silorunner via subprocess)
+
+### Phase 3d: .kc Context Packing
+
+Pack `SolveContext` into `.kc` archives on commit.
+
+**Files to modify:**
+- `mods/silo/freecad/silo_origin.py` -- Hook into commit to pack solver context
+
+### Phase 3e: Client Integration
+
+Add "Solve on Server" command to the Assembly workbench.
+
+**Files to modify:**
+- `mods/silo/freecad/` -- Solver client methods
+- `src/Mod/Assembly/` -- Server solve command
+
+---
+
+## 14. Open Questions
+
+1. **Context size limits** -- Large assemblies may produce multi-MB SolveContext JSON. Should we compress (gzip) or use a binary format (msgpack)?
+
+2. **Result persistence** -- How long should solver results be retained? Per-revision (overwritten on next commit) or historical (keep all)?
+
+3. **Kinematic frame storage** -- Kinematic simulations can produce thousands of frames. Store all frames in JSONB, or write to a separate file and reference it?
+
+4. **Multi-solver comparison** -- Should the API support running the same context through multiple solvers and comparing results? Useful for Phase 4 (second solver validation).
+
+5. **Webhook notifications** -- The `callback_url` field allows external integrations (e.g. CI). What authentication should the webhook use?
+
+---
+
+## 15. References
+
+- [KCSolve Architecture](../architecture/ondsel-solver.md)
+- [KCSolve Python API Reference](../reference/kcsolve-python.md)
+- [INTER_SOLVER.md](../../INTER_SOLVER.md) -- Full pluggable solver spec
+- [WORKERS.md](WORKERS.md) -- Worker/runner job system
+- [SPECIFICATION.md](SPECIFICATION.md) -- Silo server specification
+- [MODULES.md](MODULES.md) -- Module system

docs/SPECIFICATION.md

@@ -37,7 +37,7 @@ Silo treats **part numbering schemas as configuration, not code**. Multiple numb
                               ▼
 ┌─────────────────────────────────────────────────────────────┐
 │                   Silo Server (silod)                        │
-│  - REST API (78 endpoints)                                  │
+│  - REST API (86 endpoints)                                  │
 │  - Authentication (local, LDAP, OIDC)                       │
 │  - Schema parsing and validation                            │
 │  - Part number generation engine                            │
@@ -49,9 +49,9 @@ Silo treats **part numbering schemas as configuration, not code**. Multiple numb
               ┌───────────────┴───────────────┐
               ▼                               ▼
 ┌─────────────────────────┐     ┌─────────────────────────────┐
-│   PostgreSQL            │     │   MinIO                     │
+│   PostgreSQL            │     │   Local Filesystem          │
 │   (psql.example.internal)│     │   - File storage            │
-│   - Item metadata       │     │   - Versioned objects       │
+│   - Item metadata       │     │   - Revision files          │
 │   - Relationships       │     │   - Thumbnails              │
 │   - Revision history    │     │                             │
 │   - Auth / Sessions     │     │                             │
@@ -64,7 +64,7 @@ Silo treats **part numbering schemas as configuration, not code**. Multiple numb
 | Component | Technology | Notes |
 |-----------|------------|-------|
 | Database | PostgreSQL 16 | Existing instance at psql.example.internal |
-| File Storage | MinIO | S3-compatible, versioning enabled |
+| File Storage | Local filesystem | Files stored under configurable root directory |
 | CLI & API Server | Go (1.24) | chi/v5 router, pgx/v5 driver, zerolog |
 | Authentication | Multi-backend | Local (bcrypt), LDAP/FreeIPA, OIDC/Keycloak |
 | Sessions | PostgreSQL pgxstore | alexedwards/scs, 24h lifetime |
@@ -83,7 +83,7 @@ An **item** is the fundamental entity. Items have:
 - **Properties** (key-value pairs, schema-defined and custom)
 - **Relationships** to other items
 - **Revisions** (append-only history)
-- **Files** (optional, stored in MinIO)
+- **Files** (optional, stored on the local filesystem)
 - **Location** (optional physical inventory location)
 
 ### 3.2 Database Schema (Conceptual)
@@ -115,7 +115,7 @@ CREATE TABLE revisions (
     item_id UUID REFERENCES items(id) NOT NULL,
     revision_number INTEGER NOT NULL,
     properties JSONB NOT NULL,  -- all properties at this revision
-    file_version TEXT,  -- MinIO version ID if applicable
+    file_version TEXT,  -- storage version ID if applicable
     created_at TIMESTAMPTZ DEFAULT now(),
     created_by TEXT,  -- user identifier (future: LDAP DN)
     comment TEXT,
@@ -345,7 +345,7 @@ CAD workbench and spreadsheet extension implementations are maintained in separa
 
 ### 5.1 File Storage Strategy
 
-Files are stored as whole objects in MinIO with versioning enabled. Storage path convention: `items/{partNumber}/rev{N}.ext`. SHA-256 checksums are captured on upload for integrity verification.
+Files are stored on the local filesystem under a configurable root directory. Storage path convention: `items/{partNumber}/rev{N}.ext`. SHA-256 checksums are captured on upload for integrity verification.
 
 Future option: exploded storage (unpack ZIP-based CAD archives for better diffing).
 
@@ -439,7 +439,7 @@ Revisions are created explicitly by user action (not automatic):
 ### 7.3 Revision vs. File Version
 
 - **Revision**: Silo metadata revision (tracked in PostgreSQL)
-- **File Version**: MinIO object version (automatic on upload)
+- **File Version**: File on disk corresponding to a revision
 
 A single Silo revision may span multiple file uploads during editing. Only committed revisions create formal revision records.
 
@@ -598,12 +598,12 @@ See [AUTH.md](AUTH.md) for full architecture details and [AUTH_USER_GUIDE.md](AU
 
 ## 11. API Design
 
-### 11.1 REST Endpoints (78 Implemented)
+### 11.1 REST Endpoints (86 Implemented)
 
 ```
 # Health (no auth)
 GET    /health                                              # Basic health check
-GET    /ready                                               # Readiness (DB + MinIO)
+GET    /ready                                               # Readiness (DB)
 
 # Auth (no auth required)
 GET    /login                                               # Login page
@@ -624,8 +624,8 @@ GET    /api/auth/tokens                                     # List user's API to
 POST   /api/auth/tokens                                     # Create API token
 DELETE /api/auth/tokens/{id}                                # Revoke API token
 
-# Presigned Uploads (editor)
+# Direct Uploads (editor)
-POST   /api/uploads/presign                                 # Get presigned MinIO upload URL [editor]
+POST   /api/uploads/presign                                 # Get upload URL [editor]
 
 # Schemas (read: viewer, write: editor)
 GET    /api/schemas                                         # List all schemas
@@ -697,6 +697,20 @@ POST   /api/items/{partNumber}/bom/merge                    # Merge BOM from ODS
 PUT    /api/items/{partNumber}/bom/{childPartNumber}        # Update BOM entry [editor]
 DELETE /api/items/{partNumber}/bom/{childPartNumber}        # Remove BOM entry [editor]
 
+# .kc Metadata (read: viewer, write: editor)
+GET    /api/items/{partNumber}/metadata                     # Get indexed .kc metadata
+PUT    /api/items/{partNumber}/metadata                     # Update metadata fields [editor]
+PATCH  /api/items/{partNumber}/metadata/lifecycle           # Transition lifecycle state [editor]
+PATCH  /api/items/{partNumber}/metadata/tags                # Add/remove tags [editor]
+
+# .kc Dependencies (viewer)
+GET    /api/items/{partNumber}/dependencies                 # List raw dependencies
+GET    /api/items/{partNumber}/dependencies/resolve         # Resolve UUIDs to part numbers + file availability
+
+# .kc Macros (viewer)
+GET    /api/items/{partNumber}/macros                       # List registered macros
+GET    /api/items/{partNumber}/macros/{filename}            # Get macro source content
+
 # Audit (viewer)
 GET    /api/audit/completeness                              # Item completeness scores
 GET    /api/audit/completeness/{partNumber}                 # Item detail breakdown
@@ -735,6 +749,139 @@ POST   /api/inventory/{partNumber}/move
 
 ---
 
+## 11.3 .kc File Integration
+
+Silo supports the `.kc` file format — a ZIP archive that is a superset of FreeCAD's `.fcstd`. A `.kc` file contains everything an `.fcstd` does, plus a `silo/` directory with platform metadata.
+
+#### Standard entries (preserved as-is)
+
+`Document.xml`, `GuiDocument.xml`, BREP geometry files (`.brp`), `thumbnails/`
+
+#### Silo entries (`silo/` directory)
+
+| Path | Purpose |
+|------|---------|
+| `silo/manifest.json` | Instance origin, part UUID, revision hash, `.kc` schema version |
+| `silo/metadata.json` | Custom schema field values, tags, lifecycle state |
+| `silo/history.json` | Local revision log (server-generated on checkout) |
+| `silo/dependencies.json` | Assembly link references by Silo UUID |
+| `silo/macros/*.py` | Embedded macro scripts bound to this part |
+
+#### Commit-time extraction
+
+When a `.kc` file is uploaded via `POST /api/items/{partNumber}/file`, the server:
+
+1. Opens the ZIP and scans for `silo/` entries
+2. Parses `silo/manifest.json` and validates the UUID matches the item
+3. Upserts `silo/metadata.json` fields into the `item_metadata` table
+4. Replaces `silo/dependencies.json` entries in the `item_dependencies` table
+5. Replaces `silo/macros/*.py` entries in the `item_macros` table
+6. Broadcasts SSE events: `metadata.updated`, `dependencies.changed`, `macros.changed`
+
+Extraction is best-effort — failures are logged as warnings but do not block the upload.
+
+#### Checkout-time packing
+
+When a `.kc` file is downloaded via `GET /api/items/{partNumber}/file/{revision}`, the server repacks the `silo/` directory with current database state:
+
+- `silo/manifest.json` — current item UUID and metadata freshness
+- `silo/metadata.json` — latest schema fields, tags, lifecycle state
+- `silo/history.json` — last 20 revisions from the database
+- `silo/dependencies.json` — current dependency list from `item_dependencies`
+
+Non-silo ZIP entries are passed through unchanged. If the file is a plain `.fcstd` (no `silo/` directory), it is served as-is.
+
+ETag caching: the server computes an ETag from `revision_number:metadata.updated_at` and returns `304 Not Modified` when the client's `If-None-Match` header matches.
+
+#### Lifecycle state machine
+
+The `lifecycle_state` field in `item_metadata` follows this state machine:
+
+```
+draft → review → released → obsolete
+  ↑        ↓
+  └────────┘
+```
+
+Valid transitions are enforced by `PATCH /metadata/lifecycle`. Invalid transitions return `422 Unprocessable Entity`.
+
+#### Metadata response shape
+
+```json
+{
+  "schema_name": "kindred-rd",
+  "lifecycle_state": "draft",
+  "tags": ["prototype", "v2"],
+  "fields": {"material": "AL6061", "finish": "anodized"},
+  "manifest": {
+    "uuid": "550e8400-e29b-41d4-a716-446655440000",
+    "silo_instance": "silo.example.com",
+    "revision_hash": "abc123",
+    "kc_version": "1.0"
+  },
+  "updated_at": "2026-02-18T12:00:00Z",
+  "updated_by": "forbes"
+}
+```
+
+#### Dependency response shape
+
+```json
+[
+  {
+    "uuid": "550e8400-...",
+    "part_number": "F01-0042",
+    "revision": 3,
+    "quantity": 4.0,
+    "label": "M5 Bolt",
+    "relationship": "component"
+  }
+]
+```
+
+#### Resolved dependency response shape
+
+```json
+[
+  {
+    "uuid": "550e8400-...",
+    "part_number": "F01-0042",
+    "label": "M5 Bolt",
+    "revision": 3,
+    "quantity": 4.0,
+    "resolved": true,
+    "file_available": true
+  }
+]
+```
+
+#### Macro list response shape
+
+```json
+[
+  {"filename": "validate_dims.py", "trigger": "manual", "revision_number": 5}
+]
+```
+
+#### Macro detail response shape
+
+```json
+{
+  "filename": "validate_dims.py",
+  "trigger": "manual",
+  "content": "import FreeCAD\n...",
+  "revision_number": 5
+}
+```
+
+#### Database tables (migration 018)
+
+- `item_metadata` — schema fields, lifecycle state, tags, manifest info
+- `item_dependencies` — parent/child UUID references with quantity and relationship type
+- `item_macros` — filename, trigger type, source content, indexed per item
+
+---
+
 ## 12. MVP Scope
 
 ### 12.1 Implemented
@@ -743,8 +890,8 @@ POST   /api/inventory/{partNumber}/move
 - [x] YAML schema parser for part numbering
 - [x] Part number generation engine
 - [x] CLI tool (`cmd/silo`)
-- [x] API server (`cmd/silod`) with 78 endpoints
+- [x] API server (`cmd/silod`) with 86 endpoints
-- [x] MinIO integration for file storage with versioning
+- [x] Filesystem-based file storage
 - [x] BOM relationships (component, alternate, reference)
 - [x] Multi-level BOM (recursive expansion with configurable depth)
 - [x] Where-used queries (reverse parent lookup)
@@ -765,6 +912,12 @@ POST   /api/inventory/{partNumber}/move
 - [x] Audit logging and completeness scoring
 - [x] CSRF protection (nosurf)
 - [x] Fuzzy search
+- [x] .kc file extraction pipeline (metadata, dependencies, macros indexed on commit)
+- [x] .kc file packing on checkout (manifest, metadata, history, dependencies)
+- [x] .kc metadata API (get, update fields, lifecycle transitions, tags)
+- [x] .kc dependency API (list, resolve with file availability)
+- [x] .kc macro API (list, get source content)
+- [x] ETag caching for .kc file downloads
 - [x] Property schema versioning framework
 - [x] Docker Compose deployment (dev and prod)
 - [x] systemd service and deployment scripts

docs/STATUS.md

@@ -1,6 +1,6 @@
 # Silo Development Status
 
-**Last Updated:** 2026-02-08
+**Last Updated:** 2026-03-01
 
 ---
 
@@ -10,12 +10,12 @@
 
 | Component | Status | Notes |
 |-----------|--------|-------|
-| PostgreSQL schema | Complete | 13 migrations applied |
+| PostgreSQL schema | Complete | 23 migrations applied |
 | YAML schema parser | Complete | Supports enum, serial, constant, string segments |
 | Part number generator | Complete | Scoped sequences, category-based format |
-| API server (`silod`) | Complete | 78 REST endpoints via chi/v5 |
+| API server (`silod`) | Complete | ~140 REST endpoints via chi/v5 |
 | CLI tool (`silo`) | Complete | Item registration and management |
-| MinIO file storage | Complete | Upload, download, versioning, checksums |
+| Filesystem file storage | Complete | Upload, download, checksums |
 | Revision control | Complete | Append-only history, rollback, comparison, status/labels |
 | Project management | Complete | CRUD, many-to-many item tagging |
 | CSV import/export | Complete | Dry-run validation, template generation |
@@ -29,7 +29,17 @@
 | CSRF protection | Complete | nosurf on web forms |
 | Fuzzy search | Complete | sahilm/fuzzy library |
 | Web UI | Complete | React SPA (Vite + TypeScript), 6 pages, Catppuccin Mocha theme |
-| File attachments | Complete | Presigned uploads, item file association, thumbnails |
+| File attachments | Complete | Direct uploads, item file association, thumbnails |
+| .kc extraction pipeline | Complete | Metadata, dependencies, macros indexed on commit |
+| .kc checkout packing | Complete | Manifest, metadata, history, dependencies repacked on download |
+| .kc metadata API | Complete | GET/PUT metadata, lifecycle transitions, tag management |
+| .kc dependency API | Complete | List raw deps, resolve UUIDs to part numbers + file availability |
+| .kc macro API | Complete | List macros, get source content by filename |
+| Approval workflows | Complete | YAML-configurable ECO workflows, multi-stage review gates, digital signatures |
+| Solver service | Complete | Server-side assembly constraint solving, result caching, job definitions |
+| Workstation registration | Complete | Device identity, heartbeat tracking, per-user workstation management |
+| Edit sessions | Complete | Acquire/release locks, hard interference detection, SSE notifications |
+| SSE targeted delivery | Complete | Per-item, per-user, per-workstation event filtering |
 | Odoo ERP integration | Partial | Config and sync-log CRUD functional; push/pull are stubs |
 | Docker Compose | Complete | Dev and production configurations |
 | Deployment scripts | Complete | setup-host, deploy, init-db, setup-ipa-nginx |
@@ -47,7 +57,7 @@ FreeCAD workbench and LibreOffice Calc extension are maintained in separate repo
 | Inventory API endpoints | Database tables exist, no REST handlers |
 | Date segment type | Schema parser placeholder only |
 | Part number format validation | API accepts but does not validate format on creation |
-| Unit tests | 9 Go test files across api, db, ods, partnum, schema packages |
+| Unit tests | 31 Go test files across api, db, modules, ods, partnum, schema packages |
 
 ---
 
@@ -56,7 +66,7 @@ FreeCAD workbench and LibreOffice Calc extension are maintained in separate repo
 | Service | Host | Status |
 |---------|------|--------|
 | PostgreSQL | psql.example.internal:5432 | Running |
-| MinIO | localhost:9000 (API) / :9001 (console) | Configured |
+| File Storage | /opt/silo/data (filesystem) | Configured |
 | Silo API | localhost:8080 | Builds successfully |
 
 ---
@@ -96,3 +106,13 @@ The schema defines 170 category codes across 10 groups:
 | 011_item_files.sql | Item file attachments (item_files table, thumbnail_key column) |
 | 012_bom_source.sql | BOM entry source tracking |
 | 013_move_cost_sourcing_to_props.sql | Move sourcing_link and standard_cost from item columns to revision properties |
+| 014_settings.sql | Settings overrides and module state tables |
+| 015_jobs.sql | Job queue, runner, and job log tables |
+| 016_dag.sql | Dependency DAG nodes and edges |
+| 017_locations.sql | Location hierarchy and inventory tracking |
+| 018_kc_metadata.sql | .kc metadata tables (item_metadata, item_dependencies, item_macros, item_approvals, approval_signatures) |
+| 019_approval_workflow_name.sql | Approval workflow name column |
+| 020_storage_backend_filesystem_default.sql | Storage backend default to filesystem |
+| 021_solver_results.sql | Solver result caching table |
+| 022_workstations.sql | Workstation registration table |
+| 023_edit_sessions.sql | Edit session tracking table with hard interference unique index |

docs/WORKERS.md

@@ -0,0 +1,364 @@
+# Worker System Specification
+
+**Status:** Implemented
+**Last Updated:** 2026-03-01
+
+---
+
+## 1. Purpose
+
+The worker system provides async compute job execution for Silo. Jobs are defined as YAML files, managed by the Silo server, and executed by external runner processes. The system is general-purpose -- while DAG validation is the first use case, it supports any compute workload: geometry export, thumbnail rendering, FEA/CFD batch jobs, report generation, and data migration.
+
+---
+
+## 2. Architecture
+
+```
+YAML Job Definitions (files on disk, version-controllable)
+         |
+         v
+Silo Server (parser, scheduler, state machine, REST API, SSE events)
+         |
+         v
+Runners (silorunner binary, polls via REST, executes Headless Create)
+```
+
+**Three layers:**
+
+1. **Job definitions** -- YAML files in a configurable directory (default `/etc/silo/jobdefs`). Each file defines a job type: what triggers it, what it operates on, what computation to perform, and what runner capabilities are required. These are the source of truth and can be version-controlled alongside other Silo config.
+
+2. **Silo server** -- Parses YAML definitions on startup and upserts them into the `job_definitions` table. Creates job instances when triggers fire (revision created, BOM changed, manual). Manages job lifecycle, enforces timeouts, and broadcasts status via SSE.
+
+3. **Runners** -- Separate `silorunner` processes that authenticate with Silo via API tokens, poll for available jobs, claim them atomically, execute the compute, and report results. A runner host must have Headless Create and silo-mod installed for geometry jobs.
+
+---
+
+## 3. Job Definition Format
+
+Job definitions are YAML files with the following structure:
+
+```yaml
+job:
+  name: assembly-validate
+  version: 1
+  description: "Validate assembly by rebuilding its dependency subgraph"
+
+  trigger:
+    type: revision_created       # revision_created, bom_changed, manual, schedule
+    filter:
+      item_type: assembly        # only trigger for assemblies
+
+  scope:
+    type: assembly               # item, assembly, project
+
+  compute:
+    type: validate               # validate, rebuild, diff, export, custom
+    command: create-validate     # runner-side command identifier
+    args:                        # passed to runner as JSON
+      rebuild_mode: incremental
+      check_interference: true
+
+  runner:
+    tags: [create]               # required runner capabilities
+
+  timeout: 900                   # seconds before job is marked failed (default 600)
+  max_retries: 2                 # retry count on failure (default 1)
+  priority: 50                   # lower = higher priority (default 100)
+```
+
+### 3.1 Trigger Types
+
+| Type | Description |
+|------|-------------|
+| `revision_created` | Fires when a new revision is created on an item matching the filter |
+| `bom_changed` | Fires when a BOM merge completes |
+| `manual` | Only triggered via `POST /api/jobs` |
+| `schedule` | Future: cron-like scheduling (not yet implemented) |
+
+### 3.2 Trigger Filters
+
+The `filter` map supports key-value matching against item properties:
+
+| Key | Description |
+|-----|-------------|
+| `item_type` | Match item type: `part`, `assembly`, `drawing`, etc. |
+| `schema` | Match schema name |
+
+All filter keys must match for the trigger to fire. An empty filter matches all items.
+
+### 3.3 Scope Types
+
+| Type | Description |
+|------|-------------|
+| `item` | Job operates on a single item |
+| `assembly` | Job operates on an assembly and its BOM tree |
+| `project` | Job operates on all items in a project |
+
+### 3.4 Compute Commands
+
+The `command` field identifies what the runner should execute. Built-in commands:
+
+| Command | Description |
+|---------|-------------|
+| `create-validate` | Open file in Headless Create, rebuild features, report validation results |
+| `create-export` | Open file, export to specified format (STEP, IGES, 3MF) |
+| `create-dag-extract` | Open file, extract feature DAG, output as JSON |
+| `create-thumbnail` | Open file, render thumbnail image |
+
+Custom commands can be added by extending silo-mod's `silo.runner` module.
+
+---
+
+## 4. Job Lifecycle
+
+```
+pending → claimed → running → completed
+                            → failed
+                            → cancelled
+```
+
+| State | Description |
+|-------|-------------|
+| `pending` | Job created, waiting for a runner to claim it |
+| `claimed` | Runner has claimed the job. `expires_at` is set. |
+| `running` | Runner has started execution (reported via progress update) |
+| `completed` | Runner reported success. `result` JSONB contains output. |
+| `failed` | Runner reported failure, timeout expired, or max retries exceeded |
+| `cancelled` | Admin cancelled the job before completion |
+
+### 4.1 Claim Semantics
+
+Runners claim jobs via `POST /api/runner/claim`. The server uses PostgreSQL's `SELECT FOR UPDATE SKIP LOCKED` to ensure exactly-once delivery:
+
+```sql
+WITH claimable AS (
+    SELECT id FROM jobs
+    WHERE status = 'pending'
+      AND runner_tags <@ $2::text[]
+    ORDER BY priority ASC, created_at ASC
+    LIMIT 1
+    FOR UPDATE SKIP LOCKED
+)
+UPDATE jobs SET
+    status = 'claimed',
+    runner_id = $1,
+    claimed_at = now(),
+    expires_at = now() + (timeout_seconds || ' seconds')::interval
+FROM claimable
+WHERE jobs.id = claimable.id
+RETURNING jobs.*;
+```
+
+The `runner_tags <@ $2::text[]` condition ensures the runner has all tags required by the job. A runner with tags `["create", "linux", "gpu"]` can claim a job requiring `["create"]`, but not one requiring `["create", "windows"]`.
+
+### 4.2 Timeout Enforcement
+
+A background sweeper runs every 30 seconds (configurable via `jobs.job_timeout_check`) and marks expired jobs as failed:
+
+```sql
+UPDATE jobs SET status = 'failed', error_message = 'job timed out'
+WHERE status IN ('claimed', 'running')
+  AND expires_at < now();
+```
+
+### 4.3 Retry
+
+When a job fails and `retry_count < max_retries`, a new job is created with the same definition and scope, with `retry_count` incremented.
+
+---
+
+## 5. Runners
+
+### 5.1 Registration
+
+Runners are registered via `POST /api/runners` (admin only). The server generates a token (shown once) and stores the SHA-256 hash in the `runners` table. This follows the same pattern as API tokens in `internal/auth/token.go`.
+
+### 5.2 Authentication
+
+Runners authenticate via `Authorization: Bearer silo_runner_<token>`. A dedicated `RequireRunnerAuth` middleware validates the token against the `runners` table and injects a `RunnerIdentity` into the request context.
+
+### 5.3 Heartbeat
+
+Runners send `POST /api/runner/heartbeat` every 30 seconds. The server updates `last_heartbeat` and sets `status = 'online'`. A background sweeper marks runners as `offline` if their heartbeat is older than `runner_timeout` seconds (default 90).
+
+### 5.4 Tags
+
+Each runner declares capability tags (e.g., `["create", "linux", "gpu"]`). Jobs require specific tags via the `runner.tags` field in their YAML definition. A runner can only claim jobs whose required tags are a subset of the runner's tags.
+
+### 5.5 Runner Config
+
+The `silorunner` binary reads its config from a YAML file:
+
+```yaml
+server_url: "https://silo.example.com"
+token: "silo_runner_abc123..."
+name: "worker-01"
+tags: ["create", "linux"]
+poll_interval: 5       # seconds between claim attempts
+create_path: "/usr/bin/create"   # path to Headless Create binary (with silo-mod installed)
+```
+
+Or via environment variables: `SILO_RUNNER_SERVER_URL`, `SILO_RUNNER_TOKEN`, etc.
+
+### 5.6 Deployment
+
+Runner prerequisites:
+- `silorunner` binary (built from `cmd/silorunner/`)
+- Headless Create (Kindred's fork of FreeCAD) with silo-mod workbench installed
+- Network access to Silo server API
+
+Runners can be deployed as:
+- Bare metal processes alongside Create installations
+- Docker containers with Create pre-installed
+- Scaled horizontally by registering multiple runners with different names
+
+---
+
+## 6. Job Log
+
+Each job has an append-only log stored in the `job_log` table. Runners append entries via `POST /api/runner/jobs/{jobID}/log`:
+
+```json
+{
+  "level": "info",
+  "message": "Rebuilding Pad003...",
+  "metadata": {"node_key": "Pad003", "progress_pct": 45}
+}
+```
+
+Log levels: `debug`, `info`, `warn`, `error`.
+
+---
+
+## 7. SSE Events
+
+All job lifecycle transitions are broadcast via Silo's SSE broker. Clients subscribe to `/api/events` and receive:
+
+| Event Type | Payload | When |
+|------------|---------|------|
+| `job.created` | `{id, definition_name, item_id, status, priority}` | Job created |
+| `job.claimed` | `{id, runner_id, runner_name}` | Runner claims job |
+| `job.progress` | `{id, progress, progress_message}` | Runner reports progress (0-100) |
+| `job.completed` | `{id, result_summary, duration_seconds}` | Job completed successfully |
+| `job.failed` | `{id, error_message}` | Job failed |
+| `job.cancelled` | `{id, cancelled_by}` | Admin cancelled job |
+| `runner.online` | `{id, name, tags}` | Runner heartbeat (first after offline) |
+| `runner.offline` | `{id, name}` | Runner heartbeat timeout |
+
+---
+
+## 8. REST API
+
+### 8.1 Job Endpoints (user-facing, require auth)
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/jobs` | viewer | List jobs (filterable by status, item, definition) |
+| `GET` | `/api/jobs/{jobID}` | viewer | Get job details |
+| `GET` | `/api/jobs/{jobID}/logs` | viewer | Get job log entries |
+| `POST` | `/api/jobs` | editor | Manually trigger a job |
+| `POST` | `/api/jobs/{jobID}/cancel` | editor | Cancel a pending/running job |
+
+### 8.2 Job Definition Endpoints
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/job-definitions` | viewer | List loaded definitions |
+| `GET` | `/api/job-definitions/{name}` | viewer | Get specific definition |
+| `POST` | `/api/job-definitions/reload` | admin | Re-read YAML from disk |
+
+### 8.3 Runner Management Endpoints (admin)
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/runners` | admin | List registered runners |
+| `POST` | `/api/runners` | admin | Register runner (returns token) |
+| `DELETE` | `/api/runners/{runnerID}` | admin | Delete runner |
+
+### 8.4 Runner-Facing Endpoints (runner token auth)
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `POST` | `/api/runner/heartbeat` | runner | Send heartbeat |
+| `POST` | `/api/runner/claim` | runner | Claim next available job |
+| `PUT` | `/api/runner/jobs/{jobID}/progress` | runner | Report progress |
+| `POST` | `/api/runner/jobs/{jobID}/complete` | runner | Report completion with result |
+| `POST` | `/api/runner/jobs/{jobID}/fail` | runner | Report failure |
+| `POST` | `/api/runner/jobs/{jobID}/log` | runner | Append log entry |
+| `PUT` | `/api/runner/jobs/{jobID}/dag` | runner | Sync DAG results after compute |
+
+---
+
+## 9. Configuration
+
+Add to `config.yaml`:
+
+```yaml
+jobs:
+  directory: /etc/silo/jobdefs    # path to YAML job definitions
+  runner_timeout: 90              # seconds before marking runner offline
+  job_timeout_check: 30           # seconds between timeout sweeps
+  default_priority: 100           # default job priority
+```
+
+---
+
+## 10. Example Job Definitions
+
+### Assembly Validation
+
+```yaml
+job:
+  name: assembly-validate
+  version: 1
+  description: "Validate assembly by rebuilding its dependency subgraph"
+  trigger:
+    type: revision_created
+    filter:
+      item_type: assembly
+  scope:
+    type: assembly
+  compute:
+    type: validate
+    command: create-validate
+    args:
+      rebuild_mode: incremental
+      check_interference: true
+  runner:
+    tags: [create]
+  timeout: 900
+  max_retries: 2
+  priority: 50
+```
+
+### STEP Export
+
+```yaml
+job:
+  name: part-export-step
+  version: 1
+  description: "Export a part to STEP format"
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: export
+    command: create-export
+    args:
+      format: step
+      output_key_template: "exports/{part_number}_rev{revision}.step"
+  runner:
+    tags: [create]
+  timeout: 300
+  max_retries: 1
+  priority: 100
+```
+
+---
+
+## 11. References
+
+- [DAG.md](DAG.md) -- Dependency DAG specification
+- [MULTI_USER_EDITS.md](MULTI_USER_EDITS.md) -- Multi-user editing specification
+- [ROADMAP.md](ROADMAP.md) -- Tier 0 Job Queue Infrastructure, Tier 1 Headless Create

frontend-spec.md

@@ -337,7 +337,7 @@ Supporting files:
 | File | Purpose |
 |------|---------|
 | `web/src/components/items/CategoryPicker.tsx` | Multi-stage domain/subcategory selector |
-| `web/src/components/items/FileDropZone.tsx` | Drag-and-drop file upload with MinIO presigned URLs |
+| `web/src/components/items/FileDropZone.tsx` | Drag-and-drop file upload |
 | `web/src/components/items/TagInput.tsx` | Multi-select tag input for projects |
 | `web/src/hooks/useFormDescriptor.ts` | Fetches and caches form descriptor from `/api/schemas/{name}/form` |
 | `web/src/hooks/useFileUpload.ts` | Manages presigned URL upload flow |
@@ -421,7 +421,7 @@ Below the picker, the selected category is shown as a breadcrumb: `Fasteners ›
 
 ### FileDropZone
 
-Handles drag-and-drop and click-to-browse file uploads with MinIO presigned URL flow.
+Handles drag-and-drop and click-to-browse file uploads.
 
 **Props**:
 
@@ -435,7 +435,7 @@ interface FileDropZoneProps {
 
 interface PendingAttachment {
   file: File;
-  objectKey: string;          // MinIO key after upload
+  objectKey: string;          // storage key after upload
   uploadProgress: number;     // 0-100
   uploadStatus: 'pending' | 'uploading' | 'complete' | 'error';
   error?: string;
@@ -462,7 +462,7 @@ Clicking the zone opens a hidden `<input type="file" multiple>`.
 
 1. On file selection/drop, immediately request a presigned upload URL: `POST /api/uploads/presign` with `{ filename, content_type, size }`.
 2. Backend returns `{ object_key, upload_url, expires_at }`.
-3. `PUT` the file directly to the presigned MinIO URL using `XMLHttpRequest` (for progress tracking).
+3. `PUT` the file directly to the presigned URL using `XMLHttpRequest` (for progress tracking).
 4. On completion, update `PendingAttachment.uploadStatus` to `'complete'` and store the `object_key`.
 5. The `object_key` is later sent to the item creation endpoint to associate the file.
 
@@ -589,10 +589,10 @@ Items 1-5 below are implemented. Item 4 (hierarchical categories) is resolved by
 ```
 POST /api/uploads/presign
 Request:  { "filename": "bracket.FCStd", "content_type": "application/octet-stream", "size": 2400000 }
-Response: { "object_key": "uploads/tmp/{uuid}/{filename}", "upload_url": "https://minio.../...", "expires_at": "2026-02-06T..." }
+Response: { "object_key": "uploads/tmp/{uuid}/{filename}", "upload_url": "https://...", "expires_at": "2026-02-06T..." }
 ```
 
-The Go handler generates a presigned PUT URL via the MinIO SDK. Objects are uploaded to a temporary prefix. On item creation, they're moved/linked to the item's permanent prefix.
+The Go handler generates a presigned PUT URL for direct upload. Objects are uploaded to a temporary prefix. On item creation, they're moved/linked to the item's permanent prefix.
 
 ### 2. File Association -- IMPLEMENTED
 
@@ -612,7 +612,7 @@ Request:  { "object_key": "uploads/tmp/{uuid}/thumb.png" }
 Response: 204
 ```
 
-Stores the thumbnail at `items/{item_id}/thumbnail.png` in MinIO. Updates `item.thumbnail_key` column.
+Stores the thumbnail at `items/{item_id}/thumbnail.png` in storage. Updates `item.thumbnail_key` column.
 
 ### 4. Hierarchical Categories -- IMPLEMENTED (via Form Descriptor)
 

go.mod

@@ -11,7 +11,6 @@ require (
 	github.com/go-ldap/ldap/v3 v3.4.12
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.5.4
-	github.com/minio/minio-go/v7 v7.0.66
 	github.com/rs/zerolog v1.32.0
 	github.com/sahilm/fuzzy v0.1.1
 	golang.org/x/crypto v0.47.0
@@ -21,28 +20,16 @@ require (
 
 require (
 	github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 // indirect
-	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/jackc/puddle/v2 v2.2.1 // indirect
-	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.17.4 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
-	github.com/minio/md5-simd v1.1.2 // indirect
-	github.com/minio/sha256-simd v1.0.1 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/rs/xid v1.5.0 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	golang.org/x/net v0.48.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
 	golang.org/x/sys v0.40.0 // indirect
 	golang.org/x/text v0.33.0 // indirect
-	gopkg.in/ini.v1 v1.67.0 // indirect
 )

go.sum

@@ -13,8 +13,6 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
-github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667 h1:BP4M0CvQ4S3TGls2FvczZtj5Re/2ZzkV9VwqPHH/3Bo=
 github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667/go.mod h1:hEBeB/ic+5LoWskz+yKT7vGhhPYkProFKoKdwZRWMe0=
 github.com/go-chi/chi/v5 v5.0.12 h1:9euLV5sTrTNTRUU9POmDUvfxyj6LAABLUcEWO+JJb4s=
@@ -26,7 +24,6 @@ github.com/go-jose/go-jose/v4 v4.1.3/go.mod h1:x4oUasVrzR7071A4TnHLGSPpNOm2a21K9
 github.com/go-ldap/ldap/v3 v3.4.12 h1:1b81mv7MagXZ7+1r7cLTWmyuTqVqdwbtJSjC0DAp9s4=
 github.com/go-ldap/ldap/v3 v3.4.12/go.mod h1:+SPAGcTtOfmGsCb3h1RFiq4xpp4N636G75OEace8lNo=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/go-uuid v1.0.3 h1:2gKiV6YVmrJ1i2CKKa9obLvRieoRGviZFL26PcT/Co8=
@@ -51,13 +48,6 @@ github.com/jcmturner/gokrb5/v8 v8.4.4 h1:x1Sv4HaTpepFkXbt2IkL29DXRf8sOfZXo8eRKh6
 github.com/jcmturner/gokrb5/v8 v8.4.4/go.mod h1:1btQEpgT6k+unzCwX1KdWMEwPPkkgBtP+F6aCACiMrs=
 github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZY=
 github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc=
-github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
-github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
-github.com/klauspost/compress v1.17.4 h1:Ej5ixsIri7BrIjBkRZLTo6ghwrEtHFk7ijlczPW4fZ4=
-github.com/klauspost/compress v1.17.4/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
-github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
-github.com/klauspost/cpuid/v2 v2.2.6 h1:ndNyv040zDGIDh8thGkXYjnFtiN02M1PVVF+JE/48xc=
-github.com/klauspost/cpuid/v2 v2.2.6/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
@@ -73,31 +63,17 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
 github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
-github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
-github.com/minio/minio-go/v7 v7.0.66 h1:bnTOXOHjOqv/gcMuiVbN9o2ngRItvqE774dG9nq0Dzw=
-github.com/minio/minio-go/v7 v7.0.66/go.mod h1:DHAgmyQEGdW3Cif0UooKOyrT3Vxs82zNdV6tkKhRtbs=
-github.com/minio/sha256-simd v1.0.1 h1:6kaan5IFmwTNynnKKpDHe6FWHohJOHhCPchzK49dzMM=
-github.com/minio/sha256-simd v1.0.1/go.mod h1:Pz6AKMiUdngCLpeTL/RJY1M9rUuPMYujV5xJjtbRSN8=
-github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
-github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
-github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
-github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
-github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
-github.com/rs/xid v1.5.0 h1:mKX4bl4iPYJtEIxp6CYiUuLQ/8DYMoz0PUdtGgMFRVc=
 github.com/rs/xid v1.5.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
 github.com/rs/zerolog v1.32.0 h1:keLypqrlIjaFsbmJOBdB/qvyF8KEtCWHwobLp5l/mQ0=
 github.com/rs/zerolog v1.32.0/go.mod h1:/7mN4D5sKwJLZQ2b/znpjC3/GQWY/xaDXUM0kKWRHss=
 github.com/sahilm/fuzzy v0.1.1 h1:ceu5RHF8DGgoi+/dR5PsECjCDH1BE3Fnmpo7aVXOdRA=
 github.com/sahilm/fuzzy v0.1.1/go.mod h1:VFvziUEIMCrT6A6tw2RFIXPXXmzXbOsSHF0DOI8ZK9Y=
-github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
-github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
@@ -133,7 +109,6 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -166,8 +141,6 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
-gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/api/approval_handlers.go

@@ -0,0 +1,391 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/workflow"
+)
+
+// ApprovalResponse is the JSON representation for approval endpoints.
+type ApprovalResponse struct {
+	ID           string              `json:"id"`
+	WorkflowName string              `json:"workflow"`
+	ECONumber    *string             `json:"eco_number"`
+	State        string              `json:"state"`
+	UpdatedAt    string              `json:"updated_at"`
+	UpdatedBy    *string             `json:"updated_by"`
+	Signatures   []SignatureResponse `json:"signatures"`
+}
+
+// SignatureResponse is the JSON representation for a signature.
+type SignatureResponse struct {
+	Username string  `json:"username"`
+	Role     string  `json:"role"`
+	Status   string  `json:"status"`
+	SignedAt *string `json:"signed_at"`
+	Comment  *string `json:"comment"`
+}
+
+// CreateApprovalRequest is the JSON body for POST /approvals.
+type CreateApprovalRequest struct {
+	Workflow  string          `json:"workflow"`
+	ECONumber string          `json:"eco_number"`
+	Signers   []SignerRequest `json:"signers"`
+}
+
+// SignerRequest defines a signer in the create request.
+type SignerRequest struct {
+	Username string `json:"username"`
+	Role     string `json:"role"`
+}
+
+// SignApprovalRequest is the JSON body for POST /approvals/{id}/sign.
+type SignApprovalRequest struct {
+	Status  string  `json:"status"`
+	Comment *string `json:"comment"`
+}
+
+func approvalToResponse(a *db.ItemApproval) ApprovalResponse {
+	sigs := make([]SignatureResponse, len(a.Signatures))
+	for i, s := range a.Signatures {
+		var signedAt *string
+		if s.SignedAt != nil {
+			t := s.SignedAt.UTC().Format("2006-01-02T15:04:05Z")
+			signedAt = &t
+		}
+		sigs[i] = SignatureResponse{
+			Username: s.Username,
+			Role:     s.Role,
+			Status:   s.Status,
+			SignedAt: signedAt,
+			Comment:  s.Comment,
+		}
+	}
+	return ApprovalResponse{
+		ID:           a.ID,
+		WorkflowName: a.WorkflowName,
+		ECONumber:    a.ECONumber,
+		State:        a.State,
+		UpdatedAt:    a.UpdatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+		UpdatedBy:    a.UpdatedBy,
+		Signatures:   sigs,
+	}
+}
+
+// HandleGetApprovals returns all approvals with signatures for an item.
+// GET /api/items/{partNumber}/approvals
+func (s *Server) HandleGetApprovals(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	approvals, err := s.approvals.ListByItemWithSignatures(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list approvals")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list approvals")
+		return
+	}
+
+	resp := make([]ApprovalResponse, len(approvals))
+	for i, a := range approvals {
+		resp[i] = approvalToResponse(a)
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// HandleCreateApproval creates an ECO with a workflow and signers.
+// POST /api/items/{partNumber}/approvals
+func (s *Server) HandleCreateApproval(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	var req CreateApprovalRequest
+	if err := readJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if len(req.Signers) == 0 {
+		writeError(w, http.StatusBadRequest, "invalid_body", "At least one signer is required")
+		return
+	}
+
+	// Validate workflow exists
+	wf, ok := s.workflows[req.Workflow]
+	if !ok {
+		writeError(w, http.StatusBadRequest, "invalid_workflow", "Workflow '"+req.Workflow+"' not found")
+		return
+	}
+
+	// Validate each signer's role matches a gate in the workflow
+	for _, signer := range req.Signers {
+		if !wf.HasRole(signer.Role) {
+			writeError(w, http.StatusBadRequest, "invalid_role",
+				"Role '"+signer.Role+"' is not defined in workflow '"+req.Workflow+"'")
+			return
+		}
+	}
+
+	// Validate all required gates have at least one signer
+	signerRoles := make(map[string]bool)
+	for _, signer := range req.Signers {
+		signerRoles[signer.Role] = true
+	}
+	for _, gate := range wf.RequiredGates() {
+		if !signerRoles[gate.Role] {
+			writeError(w, http.StatusBadRequest, "missing_required_signer",
+				"Required role '"+gate.Role+"' ("+gate.Label+") has no assigned signer")
+			return
+		}
+	}
+
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	var ecoNumber *string
+	if req.ECONumber != "" {
+		ecoNumber = &req.ECONumber
+	}
+
+	approval := &db.ItemApproval{
+		ItemID:       item.ID,
+		WorkflowName: req.Workflow,
+		ECONumber:    ecoNumber,
+		State:        "pending",
+		UpdatedBy:    &username,
+	}
+
+	if err := s.approvals.Create(ctx, approval); err != nil {
+		s.logger.Error().Err(err).Msg("failed to create approval")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to create approval")
+		return
+	}
+
+	// Add signature rows for each signer
+	for _, signer := range req.Signers {
+		sig := &db.ApprovalSignature{
+			ApprovalID: approval.ID,
+			Username:   signer.Username,
+			Role:       signer.Role,
+			Status:     "pending",
+		}
+		if err := s.approvals.AddSignature(ctx, sig); err != nil {
+			s.logger.Error().Err(err).Msg("failed to add signature")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to add signer")
+			return
+		}
+	}
+
+	// Re-fetch with signatures for response
+	approval, err = s.approvals.GetWithSignatures(ctx, approval.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get approval")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get approval")
+		return
+	}
+
+	resp := approvalToResponse(approval)
+	writeJSON(w, http.StatusCreated, resp)
+	s.broker.Publish("approval.created", mustMarshal(map[string]any{
+		"part_number": partNumber,
+		"approval_id": approval.ID,
+		"workflow":    approval.WorkflowName,
+		"eco_number":  approval.ECONumber,
+	}))
+}
+
+// HandleSignApproval records an approve or reject signature.
+// POST /api/items/{partNumber}/approvals/{id}/sign
+func (s *Server) HandleSignApproval(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+	approvalID := chi.URLParam(r, "id")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	approval, err := s.approvals.GetWithSignatures(ctx, approvalID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get approval")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get approval")
+		return
+	}
+	if approval == nil || approval.ItemID != item.ID {
+		writeError(w, http.StatusNotFound, "not_found", "Approval not found")
+		return
+	}
+
+	if approval.State != "pending" {
+		writeError(w, http.StatusUnprocessableEntity, "invalid_state",
+			"Approval is in state '"+approval.State+"', signatures can only be added when 'pending'")
+		return
+	}
+
+	var req SignApprovalRequest
+	if err := readJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if req.Status != "approved" && req.Status != "rejected" {
+		writeError(w, http.StatusBadRequest, "invalid_status", "Status must be 'approved' or 'rejected'")
+		return
+	}
+
+	// Get the caller's username
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	// Check that the caller has a pending signature on this approval
+	sig, err := s.approvals.GetSignatureForUser(ctx, approvalID, username)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get signature")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to check signature")
+		return
+	}
+	if sig == nil {
+		writeError(w, http.StatusForbidden, "not_a_signer", "You are not a signer on this approval")
+		return
+	}
+	if sig.Status != "pending" {
+		writeError(w, http.StatusConflict, "already_signed", "You have already signed this approval")
+		return
+	}
+
+	// Update the signature
+	if err := s.approvals.UpdateSignature(ctx, sig.ID, req.Status, req.Comment); err != nil {
+		s.logger.Error().Err(err).Msg("failed to update signature")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to update signature")
+		return
+	}
+
+	s.broker.Publish("approval.signed", mustMarshal(map[string]any{
+		"part_number": partNumber,
+		"approval_id": approvalID,
+		"username":    username,
+		"status":      req.Status,
+	}))
+
+	// Evaluate auto-advance based on workflow rules
+	wf := s.workflows[approval.WorkflowName]
+	if wf != nil {
+		// Re-fetch signatures after update
+		approval, err = s.approvals.GetWithSignatures(ctx, approvalID)
+		if err == nil && approval != nil {
+			newState := evaluateApprovalState(wf, approval)
+			if newState != "" && newState != approval.State {
+				if err := s.approvals.UpdateState(ctx, approvalID, newState, username); err != nil {
+					s.logger.Warn().Err(err).Msg("failed to auto-advance approval state")
+				} else {
+					approval.State = newState
+					s.broker.Publish("approval.completed", mustMarshal(map[string]any{
+						"part_number": partNumber,
+						"approval_id": approvalID,
+						"state":       newState,
+					}))
+				}
+			}
+		}
+	}
+
+	// Return updated approval
+	if approval == nil {
+		approval, _ = s.approvals.GetWithSignatures(ctx, approvalID)
+	}
+	if approval != nil {
+		writeJSON(w, http.StatusOK, approvalToResponse(approval))
+	} else {
+		w.WriteHeader(http.StatusOK)
+	}
+}
+
+// HandleListWorkflows returns all loaded workflow definitions.
+// GET /api/workflows
+func (s *Server) HandleListWorkflows(w http.ResponseWriter, r *http.Request) {
+	resp := make([]map[string]any, 0, len(s.workflows))
+	for _, wf := range s.workflows {
+		resp = append(resp, map[string]any{
+			"name":        wf.Name,
+			"version":     wf.Version,
+			"description": wf.Description,
+			"gates":       wf.Gates,
+		})
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// evaluateApprovalState checks workflow rules against current signatures
+// and returns the new state, or "" if no transition is needed.
+func evaluateApprovalState(wf *workflow.Workflow, approval *db.ItemApproval) string {
+	// Check for any rejection
+	if wf.Rules.AnyReject != "" {
+		for _, sig := range approval.Signatures {
+			if sig.Status == "rejected" {
+				return wf.Rules.AnyReject
+			}
+		}
+	}
+
+	// Check if all required roles have approved
+	if wf.Rules.AllRequiredApprove != "" {
+		requiredRoles := make(map[string]bool)
+		for _, gate := range wf.RequiredGates() {
+			requiredRoles[gate.Role] = true
+		}
+
+		// For each required role, check that all signers with that role have approved
+		for _, sig := range approval.Signatures {
+			if requiredRoles[sig.Role] && sig.Status != "approved" {
+				return "" // at least one required signer hasn't approved yet
+			}
+		}
+
+		// All required signers approved
+		return wf.Rules.AllRequiredApprove
+	}
+
+	return ""
+}
+
+// readJSON decodes a JSON request body.
+func readJSON(r *http.Request, v any) error {
+	return json.NewDecoder(r.Body).Decode(v)
+}

internal/api/auth_handlers_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/kindredsystems/silo/internal/auth"
 	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/modules"
 	"github.com/kindredsystems/silo/internal/schema"
 	"github.com/kindredsystems/silo/internal/testutil"
 	"github.com/rs/zerolog"
@@ -38,6 +39,11 @@ func newAuthTestServer(t *testing.T) *Server {
 		nil,     // authConfig
 		broker,
 		state,
+		nil,                   // jobDefs
+		"",                    // jobDefsDir
+		modules.NewRegistry(), // modules
+		nil,                   // cfg
+		nil,                   // workflows
 	)
 }
 

internal/api/bom_handlers.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"context"
 	"encoding/csv"
 	"encoding/json"
 	"fmt"
@@ -284,6 +285,8 @@ func (s *Server) HandleAddBOMEntry(w http.ResponseWriter, r *http.Request) {
 	}
 
 	writeJSON(w, http.StatusCreated, entry)
+
+	go s.triggerJobs(context.Background(), "bom_changed", parent.ID, parent)
 }
 
 // HandleUpdateBOMEntry updates an existing BOM relationship.
@@ -352,6 +355,8 @@ func (s *Server) HandleUpdateBOMEntry(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	go s.triggerJobs(context.Background(), "bom_changed", parent.ID, parent)
+
 	// Reload and return updated entry
 	entries, err := s.relationships.GetBOM(ctx, parent.ID)
 	if err == nil {
@@ -418,6 +423,8 @@ func (s *Server) HandleDeleteBOMEntry(w http.ResponseWriter, r *http.Request) {
 		Msg("BOM entry removed")
 
 	w.WriteHeader(http.StatusNoContent)
+
+	go s.triggerJobs(context.Background(), "bom_changed", parent.ID, parent)
 }
 
 // Helper functions
@@ -1219,6 +1226,9 @@ func (s *Server) HandleMergeBOM(w http.ResponseWriter, r *http.Request) {
 		"unreferenced":     len(diff.Removed),
 	}))
 
+	// Trigger auto-jobs (e.g. assembly validation)
+	go s.triggerJobs(context.Background(), "bom_changed", parent.ID, parent)
+
 	writeJSON(w, http.StatusOK, resp)
 }
 

internal/api/bom_handlers_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/kindredsystems/silo/internal/auth"
 	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/modules"
 	"github.com/kindredsystems/silo/internal/schema"
 	"github.com/kindredsystems/silo/internal/testutil"
 	"github.com/rs/zerolog"
@@ -35,6 +36,11 @@ func newTestServer(t *testing.T) *Server {
 		nil, // authConfig (nil = dev mode)
 		broker,
 		state,
+		nil,                   // jobDefs
+		"",                    // jobDefsDir
+		modules.NewRegistry(), // modules
+		nil,                   // cfg
+		nil,                   // workflows
 	)
 }
 

internal/api/broker.go

@@ -20,6 +20,32 @@ type Event struct {
 type sseClient struct {
 	ch            chan Event
 	closed        chan struct{}
+	userID        string
+	workstationID string
+	mu            sync.RWMutex
+	itemFilters   map[string]struct{}
+}
+
+// WatchItem adds an item ID to this client's filter set.
+func (c *sseClient) WatchItem(itemID string) {
+	c.mu.Lock()
+	c.itemFilters[itemID] = struct{}{}
+	c.mu.Unlock()
+}
+
+// UnwatchItem removes an item ID from this client's filter set.
+func (c *sseClient) UnwatchItem(itemID string) {
+	c.mu.Lock()
+	delete(c.itemFilters, itemID)
+	c.mu.Unlock()
+}
+
+// IsWatchingItem returns whether this client is watching a specific item.
+func (c *sseClient) IsWatchingItem(itemID string) bool {
+	c.mu.RLock()
+	_, ok := c.itemFilters[itemID]
+	c.mu.RUnlock()
+	return ok
 }
 
 const (
@@ -52,10 +78,13 @@ func NewBroker(logger zerolog.Logger) *Broker {
 }
 
 // Subscribe adds a new client and returns it. The caller must call Unsubscribe when done.
-func (b *Broker) Subscribe() *sseClient {
+func (b *Broker) Subscribe(userID, workstationID string) *sseClient {
 	c := &sseClient{
 		ch:            make(chan Event, clientChanSize),
 		closed:        make(chan struct{}),
+		userID:        userID,
+		workstationID: workstationID,
+		itemFilters:   make(map[string]struct{}),
 	}
 	b.mu.Lock()
 	b.clients[c] = struct{}{}
@@ -106,6 +135,49 @@ func (b *Broker) Publish(eventType string, data string) {
 	b.mu.RUnlock()
 }
 
+// publishTargeted sends an event only to clients matching the predicate.
+// Targeted events get an ID but are not stored in the history ring buffer.
+func (b *Broker) publishTargeted(eventType, data string, match func(*sseClient) bool) {
+	ev := Event{
+		ID:   b.eventID.Add(1),
+		Type: eventType,
+		Data: data,
+	}
+
+	b.mu.RLock()
+	for c := range b.clients {
+		if match(c) {
+			select {
+			case c.ch <- ev:
+			default:
+				b.logger.Warn().Uint64("event_id", ev.ID).Str("type", eventType).Msg("dropped targeted event for slow client")
+			}
+		}
+	}
+	b.mu.RUnlock()
+}
+
+// PublishToItem sends an event only to clients watching a specific item.
+func (b *Broker) PublishToItem(itemID, eventType, data string) {
+	b.publishTargeted(eventType, data, func(c *sseClient) bool {
+		return c.IsWatchingItem(itemID)
+	})
+}
+
+// PublishToWorkstation sends an event only to the specified workstation.
+func (b *Broker) PublishToWorkstation(workstationID, eventType, data string) {
+	b.publishTargeted(eventType, data, func(c *sseClient) bool {
+		return c.workstationID == workstationID
+	})
+}
+
+// PublishToUser sends an event to all connections for a specific user.
+func (b *Broker) PublishToUser(userID, eventType, data string) {
+	b.publishTargeted(eventType, data, func(c *sseClient) bool {
+		return c.userID == userID
+	})
+}
+
 // ClientCount returns the number of connected SSE clients.
 func (b *Broker) ClientCount() int {
 	b.mu.RLock()

internal/api/broker_test.go

@@ -10,7 +10,7 @@ import (
 func TestBrokerSubscribeUnsubscribe(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
 
-	c := b.Subscribe()
+	c := b.Subscribe("", "")
 	if b.ClientCount() != 1 {
 		t.Fatalf("expected 1 client, got %d", b.ClientCount())
 	}
@@ -23,7 +23,7 @@ func TestBrokerSubscribeUnsubscribe(t *testing.T) {
 
 func TestBrokerPublish(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
-	c := b.Subscribe()
+	c := b.Subscribe("", "")
 	defer b.Unsubscribe(c)
 
 	b.Publish("item.created", `{"part_number":"F01-0001"}`)
@@ -46,7 +46,7 @@ func TestBrokerPublish(t *testing.T) {
 
 func TestBrokerPublishDropsSlow(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
-	c := b.Subscribe()
+	c := b.Subscribe("", "")
 	defer b.Unsubscribe(c)
 
 	// Fill the client's channel
@@ -89,9 +89,9 @@ func TestBrokerEventsSince(t *testing.T) {
 func TestBrokerClientCount(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
 
-	c1 := b.Subscribe()
+	c1 := b.Subscribe("", "")
-	c2 := b.Subscribe()
+	c2 := b.Subscribe("", "")
-	c3 := b.Subscribe()
+	c3 := b.Subscribe("", "")
 
 	if b.ClientCount() != 3 {
 		t.Fatalf("expected 3 clients, got %d", b.ClientCount())
@@ -111,7 +111,7 @@ func TestBrokerClientCount(t *testing.T) {
 
 func TestBrokerShutdown(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
-	c := b.Subscribe()
+	c := b.Subscribe("", "")
 
 	b.Shutdown()
 
@@ -145,3 +145,128 @@ func TestBrokerMonotonicIDs(t *testing.T) {
 		}
 	}
 }
+
+func TestWatchUnwatchItem(t *testing.T) {
+	b := NewBroker(zerolog.Nop())
+	c := b.Subscribe("user1", "ws1")
+	defer b.Unsubscribe(c)
+
+	if c.IsWatchingItem("item-abc") {
+		t.Fatal("should not be watching item-abc before WatchItem")
+	}
+
+	c.WatchItem("item-abc")
+	if !c.IsWatchingItem("item-abc") {
+		t.Fatal("should be watching item-abc after WatchItem")
+	}
+
+	c.UnwatchItem("item-abc")
+	if c.IsWatchingItem("item-abc") {
+		t.Fatal("should not be watching item-abc after UnwatchItem")
+	}
+}
+
+func TestPublishToItem(t *testing.T) {
+	b := NewBroker(zerolog.Nop())
+	watcher := b.Subscribe("user1", "ws1")
+	defer b.Unsubscribe(watcher)
+	bystander := b.Subscribe("user2", "ws2")
+	defer b.Unsubscribe(bystander)
+
+	watcher.WatchItem("item-abc")
+	b.PublishToItem("item-abc", "edit.started", `{"item_id":"item-abc"}`)
+
+	// Watcher should receive the event.
+	select {
+	case ev := <-watcher.ch:
+		if ev.Type != "edit.started" {
+			t.Fatalf("expected edit.started, got %s", ev.Type)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("watcher did not receive targeted event")
+	}
+
+	// Bystander should not.
+	select {
+	case ev := <-bystander.ch:
+		t.Fatalf("bystander should not receive targeted event, got %s", ev.Type)
+	case <-time.After(50 * time.Millisecond):
+		// expected
+	}
+}
+
+func TestPublishToWorkstation(t *testing.T) {
+	b := NewBroker(zerolog.Nop())
+	target := b.Subscribe("user1", "ws-target")
+	defer b.Unsubscribe(target)
+	other := b.Subscribe("user1", "ws-other")
+	defer b.Unsubscribe(other)
+
+	b.PublishToWorkstation("ws-target", "sync.update", `{"data":"x"}`)
+
+	select {
+	case ev := <-target.ch:
+		if ev.Type != "sync.update" {
+			t.Fatalf("expected sync.update, got %s", ev.Type)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("target workstation did not receive event")
+	}
+
+	select {
+	case ev := <-other.ch:
+		t.Fatalf("other workstation should not receive event, got %s", ev.Type)
+	case <-time.After(50 * time.Millisecond):
+		// expected
+	}
+}
+
+func TestPublishToUser(t *testing.T) {
+	b := NewBroker(zerolog.Nop())
+	c1 := b.Subscribe("user1", "ws1")
+	defer b.Unsubscribe(c1)
+	c2 := b.Subscribe("user1", "ws2")
+	defer b.Unsubscribe(c2)
+	c3 := b.Subscribe("user2", "ws3")
+	defer b.Unsubscribe(c3)
+
+	b.PublishToUser("user1", "user.notify", `{"msg":"hello"}`)
+
+	// Both user1 connections should receive.
+	for _, c := range []*sseClient{c1, c2} {
+		select {
+		case ev := <-c.ch:
+			if ev.Type != "user.notify" {
+				t.Fatalf("expected user.notify, got %s", ev.Type)
+			}
+		case <-time.After(time.Second):
+			t.Fatal("user1 client did not receive event")
+		}
+	}
+
+	// user2 should not.
+	select {
+	case ev := <-c3.ch:
+		t.Fatalf("user2 should not receive event, got %s", ev.Type)
+	case <-time.After(50 * time.Millisecond):
+		// expected
+	}
+}
+
+func TestTargetedEventsNotInHistory(t *testing.T) {
+	b := NewBroker(zerolog.Nop())
+	c := b.Subscribe("user1", "ws1")
+	defer b.Unsubscribe(c)
+	c.WatchItem("item-abc")
+
+	b.Publish("broadcast", `{}`)
+	b.PublishToItem("item-abc", "targeted", `{}`)
+
+	events := b.EventsSince(0)
+	if len(events) != 1 {
+		t.Fatalf("expected 1 event in history (broadcast only), got %d", len(events))
+	}
+	if events[0].Type != "broadcast" {
+		t.Fatalf("expected broadcast event in history, got %s", events[0].Type)
+	}
+}

internal/api/csv_handlers_test.go

@@ -13,6 +13,7 @@ import (
 	"testing"
 
 	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/modules"
 	"github.com/kindredsystems/silo/internal/schema"
 	"github.com/kindredsystems/silo/internal/testutil"
 	"github.com/rs/zerolog"
@@ -64,6 +65,11 @@ func newTestServerWithSchemas(t *testing.T) *Server {
 		nil, // authConfig
 		broker,
 		state,
+		nil,                   // jobDefs
+		"",                    // jobDefsDir
+		modules.NewRegistry(), // modules
+		nil,                   // cfg
+		nil,                   // workflows
 	)
 }
 

internal/api/dag_handlers.go

@@ -0,0 +1,271 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/db"
+)
+
+// dagSyncRequest is the payload for PUT /api/items/{partNumber}/dag.
+type dagSyncRequest struct {
+	RevisionNumber int           `json:"revision_number"`
+	Nodes          []dagSyncNode `json:"nodes"`
+	Edges          []dagSyncEdge `json:"edges"`
+}
+
+type dagSyncNode struct {
+	NodeKey         string         `json:"node_key"`
+	NodeType        string         `json:"node_type"`
+	PropertiesHash  *string        `json:"properties_hash,omitempty"`
+	ValidationState string         `json:"validation_state,omitempty"`
+	Metadata        map[string]any `json:"metadata,omitempty"`
+}
+
+type dagSyncEdge struct {
+	SourceKey string         `json:"source_key"`
+	TargetKey string         `json:"target_key"`
+	EdgeType  string         `json:"edge_type,omitempty"`
+	Metadata  map[string]any `json:"metadata,omitempty"`
+}
+
+// HandleGetDAG returns the feature DAG for an item's current revision.
+func (s *Server) HandleGetDAG(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	nodes, err := s.dag.GetNodes(ctx, item.ID, item.CurrentRevision)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get DAG nodes")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get DAG")
+		return
+	}
+
+	edges, err := s.dag.GetEdges(ctx, item.ID, item.CurrentRevision)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get DAG edges")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get DAG edges")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"item_id":         item.ID,
+		"part_number":     item.PartNumber,
+		"revision_number": item.CurrentRevision,
+		"nodes":           nodes,
+		"edges":           edges,
+	})
+}
+
+// HandleGetForwardCone returns all downstream dependents of a node.
+func (s *Server) HandleGetForwardCone(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+	nodeKey := chi.URLParam(r, "nodeKey")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	node, err := s.dag.GetNodeByKey(ctx, item.ID, item.CurrentRevision, nodeKey)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get DAG node")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get node")
+		return
+	}
+	if node == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Node not found")
+		return
+	}
+
+	cone, err := s.dag.GetForwardCone(ctx, node.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get forward cone")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get forward cone")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"root_node": node,
+		"cone":      cone,
+	})
+}
+
+// HandleGetDirtySubgraph returns all non-clean nodes for an item.
+func (s *Server) HandleGetDirtySubgraph(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	nodes, err := s.dag.GetDirtySubgraph(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get dirty subgraph")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get dirty subgraph")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"item_id": item.ID,
+		"nodes":   nodes,
+	})
+}
+
+// HandleSyncDAG accepts a full feature tree from a client or runner.
+func (s *Server) HandleSyncDAG(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	var req dagSyncRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if req.RevisionNumber == 0 {
+		req.RevisionNumber = item.CurrentRevision
+	}
+
+	// Convert request nodes to DB nodes
+	nodes := make([]db.DAGNode, len(req.Nodes))
+	for i, n := range req.Nodes {
+		state := n.ValidationState
+		if state == "" {
+			state = "clean"
+		}
+		nodes[i] = db.DAGNode{
+			NodeKey:         n.NodeKey,
+			NodeType:        n.NodeType,
+			PropertiesHash:  n.PropertiesHash,
+			ValidationState: state,
+			Metadata:        n.Metadata,
+		}
+	}
+
+	// Sync nodes first to get IDs
+	if err := s.dag.SyncFeatureTree(ctx, item.ID, req.RevisionNumber, nodes, nil); err != nil {
+		s.logger.Error().Err(err).Msg("failed to sync DAG nodes")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to sync DAG")
+		return
+	}
+
+	// Build key→ID map from synced nodes
+	keyToID := make(map[string]string, len(nodes))
+	for _, n := range nodes {
+		keyToID[n.NodeKey] = n.ID
+	}
+
+	// Convert request edges, resolving keys to IDs
+	edges := make([]db.DAGEdge, len(req.Edges))
+	for i, e := range req.Edges {
+		sourceID, ok := keyToID[e.SourceKey]
+		if !ok {
+			writeError(w, http.StatusBadRequest, "invalid_edge",
+				"Unknown source_key: "+e.SourceKey)
+			return
+		}
+		targetID, ok := keyToID[e.TargetKey]
+		if !ok {
+			writeError(w, http.StatusBadRequest, "invalid_edge",
+				"Unknown target_key: "+e.TargetKey)
+			return
+		}
+		edgeType := e.EdgeType
+		if edgeType == "" {
+			edgeType = "depends_on"
+		}
+		edges[i] = db.DAGEdge{
+			SourceNodeID: sourceID,
+			TargetNodeID: targetID,
+			EdgeType:     edgeType,
+			Metadata:     e.Metadata,
+		}
+	}
+
+	// Sync edges (nodes already synced, so pass empty nodes to skip re-upsert)
+	if len(edges) > 0 {
+		// Delete old edges and insert new ones
+		if err := s.dag.DeleteEdgesForItem(ctx, item.ID, req.RevisionNumber); err != nil {
+			s.logger.Error().Err(err).Msg("failed to delete old edges")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to sync DAG edges")
+			return
+		}
+		for i := range edges {
+			if err := s.dag.CreateEdge(ctx, &edges[i]); err != nil {
+				s.logger.Error().Err(err).Msg("failed to create edge")
+				writeError(w, http.StatusInternalServerError, "internal_error", "Failed to create edge")
+				return
+			}
+		}
+	}
+
+	// Publish SSE event
+	s.broker.Publish("dag.updated", mustMarshal(map[string]any{
+		"item_id":         item.ID,
+		"part_number":     item.PartNumber,
+		"revision_number": req.RevisionNumber,
+		"node_count":      len(req.Nodes),
+		"edge_count":      len(req.Edges),
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"synced":     true,
+		"node_count": len(req.Nodes),
+		"edge_count": len(req.Edges),
+	})
+}
+
+// HandleMarkDirty marks a node and all its downstream dependents as dirty.
+func (s *Server) HandleMarkDirty(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+	nodeKey := chi.URLParam(r, "nodeKey")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	node, err := s.dag.GetNodeByKey(ctx, item.ID, item.CurrentRevision, nodeKey)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get DAG node")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get node")
+		return
+	}
+	if node == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Node not found")
+		return
+	}
+
+	affected, err := s.dag.MarkDirty(ctx, node.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to mark dirty")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to mark dirty")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"node_key":       nodeKey,
+		"nodes_affected": affected,
+	})
+}

internal/api/dag_handlers_test.go

@@ -0,0 +1,250 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/modules"
+	"github.com/kindredsystems/silo/internal/schema"
+	"github.com/kindredsystems/silo/internal/testutil"
+	"github.com/rs/zerolog"
+)
+
+func newDAGTestServer(t *testing.T) *Server {
+	t.Helper()
+	pool := testutil.MustConnectTestPool(t)
+	database := db.NewFromPool(pool)
+	broker := NewBroker(zerolog.Nop())
+	state := NewServerState(zerolog.Nop(), nil, broker)
+	return NewServer(
+		zerolog.Nop(),
+		database,
+		map[string]*schema.Schema{},
+		"",
+		nil, nil, nil, nil, nil,
+		broker, state,
+		nil, "",
+		modules.NewRegistry(), nil,
+		nil,
+	)
+}
+
+func newDAGRouter(s *Server) http.Handler {
+	r := chi.NewRouter()
+	r.Route("/api/items/{partNumber}", func(r chi.Router) {
+		r.Get("/dag", s.HandleGetDAG)
+		r.Get("/dag/forward-cone/{nodeKey}", s.HandleGetForwardCone)
+		r.Get("/dag/dirty", s.HandleGetDirtySubgraph)
+		r.Put("/dag", s.HandleSyncDAG)
+		r.Post("/dag/mark-dirty/{nodeKey}", s.HandleMarkDirty)
+	})
+	return r
+}
+
+func TestHandleGetDAG_Empty(t *testing.T) {
+	s := newDAGTestServer(t)
+	r := newDAGRouter(s)
+
+	// Create an item
+	item := &db.Item{PartNumber: "DAG-TEST-001", ItemType: "part", Description: "DAG test"}
+	if err := s.items.Create(context.Background(), item, nil); err != nil {
+		t.Fatalf("creating item: %v", err)
+	}
+
+	req := httptest.NewRequest("GET", "/api/items/DAG-TEST-001/dag", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var resp map[string]any
+	json.Unmarshal(w.Body.Bytes(), &resp)
+	if resp["part_number"] != "DAG-TEST-001" {
+		t.Errorf("expected part_number DAG-TEST-001, got %v", resp["part_number"])
+	}
+}
+
+func TestHandleSyncDAG(t *testing.T) {
+	s := newDAGTestServer(t)
+	r := newDAGRouter(s)
+
+	// Create an item with a revision
+	item := &db.Item{PartNumber: "DAG-SYNC-001", ItemType: "part", Description: "sync test"}
+	if err := s.items.Create(context.Background(), item, nil); err != nil {
+		t.Fatalf("creating item: %v", err)
+	}
+
+	// Sync a feature tree
+	body := `{
+		"nodes": [
+			{"node_key": "Sketch001", "node_type": "sketch"},
+			{"node_key": "Pad001", "node_type": "pad"},
+			{"node_key": "Fillet001", "node_type": "fillet"}
+		],
+		"edges": [
+			{"source_key": "Sketch001", "target_key": "Pad001", "edge_type": "depends_on"},
+			{"source_key": "Pad001", "target_key": "Fillet001", "edge_type": "depends_on"}
+		]
+	}`
+
+	req := httptest.NewRequest("PUT", "/api/items/DAG-SYNC-001/dag", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var resp map[string]any
+	json.Unmarshal(w.Body.Bytes(), &resp)
+	if resp["node_count"] != float64(3) {
+		t.Errorf("expected 3 nodes, got %v", resp["node_count"])
+	}
+	if resp["edge_count"] != float64(2) {
+		t.Errorf("expected 2 edges, got %v", resp["edge_count"])
+	}
+
+	// Verify we can read the DAG back
+	req2 := httptest.NewRequest("GET", "/api/items/DAG-SYNC-001/dag", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("GET dag: expected 200, got %d", w2.Code)
+	}
+	var dagResp map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &dagResp)
+	nodes, ok := dagResp["nodes"].([]any)
+	if !ok || len(nodes) != 3 {
+		t.Errorf("expected 3 nodes in GET, got %v", dagResp["nodes"])
+	}
+}
+
+func TestHandleForwardCone(t *testing.T) {
+	s := newDAGTestServer(t)
+	r := newDAGRouter(s)
+
+	item := &db.Item{PartNumber: "DAG-CONE-001", ItemType: "part", Description: "cone test"}
+	if err := s.items.Create(context.Background(), item, nil); err != nil {
+		t.Fatalf("creating item: %v", err)
+	}
+
+	// Sync a linear chain: A -> B -> C
+	body := `{
+		"nodes": [
+			{"node_key": "A", "node_type": "sketch"},
+			{"node_key": "B", "node_type": "pad"},
+			{"node_key": "C", "node_type": "fillet"}
+		],
+		"edges": [
+			{"source_key": "A", "target_key": "B"},
+			{"source_key": "B", "target_key": "C"}
+		]
+	}`
+	req := httptest.NewRequest("PUT", "/api/items/DAG-CONE-001/dag", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("sync: %d %s", w.Code, w.Body.String())
+	}
+
+	// Forward cone from A should include B and C
+	req2 := httptest.NewRequest("GET", "/api/items/DAG-CONE-001/dag/forward-cone/A", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("forward-cone: %d %s", w2.Code, w2.Body.String())
+	}
+
+	var resp map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &resp)
+	cone, ok := resp["cone"].([]any)
+	if !ok || len(cone) != 2 {
+		t.Errorf("expected 2 nodes in forward cone, got %v", resp["cone"])
+	}
+}
+
+func TestHandleMarkDirty(t *testing.T) {
+	s := newDAGTestServer(t)
+	r := newDAGRouter(s)
+
+	item := &db.Item{PartNumber: "DAG-DIRTY-001", ItemType: "part", Description: "dirty test"}
+	if err := s.items.Create(context.Background(), item, nil); err != nil {
+		t.Fatalf("creating item: %v", err)
+	}
+
+	// Sync: A -> B -> C
+	body := `{
+		"nodes": [
+			{"node_key": "X", "node_type": "sketch"},
+			{"node_key": "Y", "node_type": "pad"},
+			{"node_key": "Z", "node_type": "fillet"}
+		],
+		"edges": [
+			{"source_key": "X", "target_key": "Y"},
+			{"source_key": "Y", "target_key": "Z"}
+		]
+	}`
+	req := httptest.NewRequest("PUT", "/api/items/DAG-DIRTY-001/dag", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("sync: %d %s", w.Code, w.Body.String())
+	}
+
+	// Mark X dirty — should propagate to Y and Z
+	req2 := httptest.NewRequest("POST", "/api/items/DAG-DIRTY-001/dag/mark-dirty/X", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("mark-dirty: %d %s", w2.Code, w2.Body.String())
+	}
+
+	var resp map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &resp)
+	affected := resp["nodes_affected"].(float64)
+	if affected != 3 {
+		t.Errorf("expected 3 nodes affected, got %v", affected)
+	}
+
+	// Verify dirty subgraph
+	req3 := httptest.NewRequest("GET", "/api/items/DAG-DIRTY-001/dag/dirty", nil)
+	w3 := httptest.NewRecorder()
+	r.ServeHTTP(w3, req3)
+
+	if w3.Code != http.StatusOK {
+		t.Fatalf("dirty: %d %s", w3.Code, w3.Body.String())
+	}
+	var dirtyResp map[string]any
+	json.Unmarshal(w3.Body.Bytes(), &dirtyResp)
+	dirtyNodes, ok := dirtyResp["nodes"].([]any)
+	if !ok || len(dirtyNodes) != 3 {
+		t.Errorf("expected 3 dirty nodes, got %v", dirtyResp["nodes"])
+	}
+}
+
+func TestHandleGetDAG_NotFound(t *testing.T) {
+	s := newDAGTestServer(t)
+	r := newDAGRouter(s)
+
+	req := httptest.NewRequest("GET", "/api/items/NONEXISTENT-999/dag", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("expected 404, got %d", w.Code)
+	}
+}

internal/api/dependency_handlers.go

@@ -0,0 +1,125 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/storage"
+)
+
+// DependencyResponse is the JSON representation for GET /dependencies.
+type DependencyResponse struct {
+	UUID         string   `json:"uuid"`
+	PartNumber   *string  `json:"part_number"`
+	Revision     *int     `json:"revision"`
+	Quantity     *float64 `json:"quantity"`
+	Label        *string  `json:"label"`
+	Relationship string   `json:"relationship"`
+}
+
+// ResolvedDependencyResponse is the JSON representation for GET /dependencies/resolve.
+type ResolvedDependencyResponse struct {
+	UUID          string   `json:"uuid"`
+	PartNumber    *string  `json:"part_number"`
+	Label         *string  `json:"label"`
+	Revision      *int     `json:"revision"`
+	Quantity      *float64 `json:"quantity"`
+	Resolved      bool     `json:"resolved"`
+	FileAvailable bool     `json:"file_available"`
+}
+
+// HandleGetDependencies returns the raw dependency list for an item.
+// GET /api/items/{partNumber}/dependencies
+func (s *Server) HandleGetDependencies(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	deps, err := s.deps.ListByItem(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list dependencies")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list dependencies")
+		return
+	}
+
+	resp := make([]DependencyResponse, len(deps))
+	for i, d := range deps {
+		resp[i] = DependencyResponse{
+			UUID:         d.ChildUUID,
+			PartNumber:   d.ChildPartNumber,
+			Revision:     d.ChildRevision,
+			Quantity:     d.Quantity,
+			Label:        d.Label,
+			Relationship: d.Relationship,
+		}
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// HandleResolveDependencies returns dependencies with UUIDs resolved to part numbers
+// and file availability status.
+// GET /api/items/{partNumber}/dependencies/resolve
+func (s *Server) HandleResolveDependencies(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	deps, err := s.deps.Resolve(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to resolve dependencies")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to resolve dependencies")
+		return
+	}
+
+	resp := make([]ResolvedDependencyResponse, len(deps))
+	for i, d := range deps {
+		// Use resolved part number if available, fall back to .kc-provided value.
+		pn := d.ChildPartNumber
+		rev := d.ChildRevision
+		if d.Resolved {
+			pn = d.ResolvedPartNumber
+			rev = d.ResolvedRevision
+		}
+
+		fileAvailable := false
+		if d.Resolved && pn != nil && rev != nil && s.storage != nil {
+			key := storage.FileKey(*pn, *rev)
+			if exists, err := s.storage.Exists(ctx, key); err == nil {
+				fileAvailable = exists
+			}
+		}
+
+		resp[i] = ResolvedDependencyResponse{
+			UUID:          d.ChildUUID,
+			PartNumber:    pn,
+			Label:         d.Label,
+			Revision:      rev,
+			Quantity:      d.Quantity,
+			Resolved:      d.Resolved,
+			FileAvailable: fileAvailable,
+		}
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}

internal/api/file_handlers.go

@@ -3,7 +3,9 @@ package api
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
+	"strconv"
 	"strings"
 	"time"
 
@@ -19,7 +21,7 @@ type presignUploadRequest struct {
 	Size        int64  `json:"size"`
 }
 
-// HandlePresignUpload generates a presigned PUT URL for direct browser upload to MinIO.
+// HandlePresignUpload generates a presigned PUT URL for direct browser upload.
 func (s *Server) HandlePresignUpload(w http.ResponseWriter, r *http.Request) {
 	if s.storage == nil {
 		writeError(w, http.StatusServiceUnavailable, "storage_unavailable", "File storage not configured")
@@ -314,3 +316,185 @@ func (s *Server) HandleSetItemThumbnail(w http.ResponseWriter, r *http.Request)
 
 	w.WriteHeader(http.StatusNoContent)
 }
+
+// storageBackend returns the configured storage backend name.
+func (s *Server) storageBackend() string {
+	return "filesystem"
+}
+
+// HandleUploadItemFile accepts a multipart file upload and stores it as an item attachment.
+func (s *Server) HandleUploadItemFile(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	if s.storage == nil {
+		writeError(w, http.StatusServiceUnavailable, "storage_unavailable", "File storage not configured")
+		return
+	}
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	// Parse multipart form (max 500MB)
+	if err := r.ParseMultipartForm(500 << 20); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_form", err.Error())
+		return
+	}
+
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "missing_file", "File is required")
+		return
+	}
+	defer file.Close()
+
+	contentType := header.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	// Generate permanent key
+	fileID := uuid.New().String()
+	permanentKey := fmt.Sprintf("items/%s/files/%s/%s", item.ID, fileID, header.Filename)
+
+	// Write directly to storage
+	result, err := s.storage.Put(ctx, permanentKey, file, header.Size, contentType)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to upload file")
+		writeError(w, http.StatusInternalServerError, "upload_failed", "Failed to store file")
+		return
+	}
+
+	// Create DB record
+	itemFile := &db.ItemFile{
+		ItemID:         item.ID,
+		Filename:       header.Filename,
+		ContentType:    contentType,
+		Size:           result.Size,
+		ObjectKey:      permanentKey,
+		StorageBackend: s.storageBackend(),
+	}
+	if err := s.itemFiles.Create(ctx, itemFile); err != nil {
+		s.logger.Error().Err(err).Msg("failed to create item file record")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to save file record")
+		return
+	}
+
+	s.logger.Info().
+		Str("part_number", partNumber).
+		Str("file_id", itemFile.ID).
+		Str("filename", header.Filename).
+		Int64("size", result.Size).
+		Msg("file uploaded to item")
+
+	writeJSON(w, http.StatusCreated, itemFileToResponse(itemFile))
+}
+
+// HandleUploadItemThumbnail accepts a multipart file upload and sets it as the item thumbnail.
+func (s *Server) HandleUploadItemThumbnail(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	if s.storage == nil {
+		writeError(w, http.StatusServiceUnavailable, "storage_unavailable", "File storage not configured")
+		return
+	}
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	// Parse multipart form (max 10MB for thumbnails)
+	if err := r.ParseMultipartForm(10 << 20); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_form", err.Error())
+		return
+	}
+
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "missing_file", "File is required")
+		return
+	}
+	defer file.Close()
+
+	contentType := header.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "image/png"
+	}
+
+	thumbnailKey := fmt.Sprintf("items/%s/thumbnail.png", item.ID)
+
+	if _, err := s.storage.Put(ctx, thumbnailKey, file, header.Size, contentType); err != nil {
+		s.logger.Error().Err(err).Msg("failed to upload thumbnail")
+		writeError(w, http.StatusInternalServerError, "upload_failed", "Failed to store thumbnail")
+		return
+	}
+
+	if err := s.items.SetThumbnailKey(ctx, item.ID, thumbnailKey); err != nil {
+		s.logger.Error().Err(err).Msg("failed to update thumbnail key")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to save thumbnail")
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// HandleDownloadItemFile streams an item file attachment to the client.
+func (s *Server) HandleDownloadItemFile(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+	fileID := chi.URLParam(r, "fileId")
+
+	if s.storage == nil {
+		writeError(w, http.StatusServiceUnavailable, "storage_unavailable", "File storage not configured")
+		return
+	}
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil || item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	file, err := s.itemFiles.Get(ctx, fileID)
+	if err != nil {
+		writeError(w, http.StatusNotFound, "not_found", "File not found")
+		return
+	}
+
+	if file.ItemID != item.ID {
+		writeError(w, http.StatusNotFound, "not_found", "File not found")
+		return
+	}
+
+	reader, err := s.storage.Get(ctx, file.ObjectKey)
+	if err != nil {
+		s.logger.Error().Err(err).Str("key", file.ObjectKey).Msg("failed to get file")
+		writeError(w, http.StatusInternalServerError, "download_failed", "Failed to retrieve file")
+		return
+	}
+	defer reader.Close()
+
+	w.Header().Set("Content-Type", file.ContentType)
+	w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, file.Filename))
+	if file.Size > 0 {
+		w.Header().Set("Content-Length", strconv.FormatInt(file.Size, 10))
+	}
+
+	io.Copy(w, reader)
+}

internal/api/handlers.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -18,9 +19,13 @@ import (
 	"github.com/kindredsystems/silo/internal/auth"
 	"github.com/kindredsystems/silo/internal/config"
 	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/jobdef"
+	"github.com/kindredsystems/silo/internal/kc"
+	"github.com/kindredsystems/silo/internal/modules"
 	"github.com/kindredsystems/silo/internal/partnum"
 	"github.com/kindredsystems/silo/internal/schema"
 	"github.com/kindredsystems/silo/internal/storage"
+	"github.com/kindredsystems/silo/internal/workflow"
 	"github.com/rs/zerolog"
 	"gopkg.in/yaml.v3"
 )
@@ -35,7 +40,7 @@ type Server struct {
 	schemas       map[string]*schema.Schema
 	schemasDir    string
 	partgen       *partnum.Generator
-	storage       *storage.Storage
+	storage       storage.FileStore
 	auth          *auth.Service
 	sessions      *scs.SessionManager
 	oidc          *auth.OIDCBackend
@@ -43,6 +48,21 @@ type Server struct {
 	itemFiles     *db.ItemFileRepository
 	broker        *Broker
 	serverState   *ServerState
+	dag           *db.DAGRepository
+	jobs          *db.JobRepository
+	locations     *db.LocationRepository
+	jobDefs       map[string]*jobdef.Definition
+	jobDefsDir    string
+	modules       *modules.Registry
+	cfg           *config.Config
+	settings      *db.SettingsRepository
+	metadata      *db.ItemMetadataRepository
+	deps          *db.ItemDependencyRepository
+	macros        *db.ItemMacroRepository
+	approvals     *db.ItemApprovalRepository
+	workflows     map[string]*workflow.Workflow
+	solverResults *db.SolverResultRepository
+	workstations  *db.WorkstationRepository
 }
 
 // NewServer creates a new API server.
@@ -51,18 +71,33 @@ func NewServer(
 	database *db.DB,
 	schemas map[string]*schema.Schema,
 	schemasDir string,
-	store *storage.Storage,
+	store storage.FileStore,
 	authService *auth.Service,
 	sessionManager *scs.SessionManager,
 	oidcBackend *auth.OIDCBackend,
 	authCfg *config.AuthConfig,
 	broker *Broker,
 	state *ServerState,
+	jobDefs map[string]*jobdef.Definition,
+	jobDefsDir string,
+	registry *modules.Registry,
+	cfg *config.Config,
+	workflows map[string]*workflow.Workflow,
 ) *Server {
 	items := db.NewItemRepository(database)
 	projects := db.NewProjectRepository(database)
 	relationships := db.NewRelationshipRepository(database)
 	itemFiles := db.NewItemFileRepository(database)
+	dag := db.NewDAGRepository(database)
+	jobs := db.NewJobRepository(database)
+	settings := db.NewSettingsRepository(database)
+	locations := db.NewLocationRepository(database)
+	metadata := db.NewItemMetadataRepository(database)
+	itemDeps := db.NewItemDependencyRepository(database)
+	itemMacros := db.NewItemMacroRepository(database)
+	itemApprovals := db.NewItemApprovalRepository(database)
+	solverResults := db.NewSolverResultRepository(database)
+	workstations := db.NewWorkstationRepository(database)
 	seqStore := &dbSequenceStore{db: database, schemas: schemas}
 	partgen := partnum.NewGenerator(schemas, seqStore)
 
@@ -83,6 +118,21 @@ func NewServer(
 		itemFiles:     itemFiles,
 		broker:        broker,
 		serverState:   state,
+		dag:           dag,
+		jobs:          jobs,
+		locations:     locations,
+		jobDefs:       jobDefs,
+		jobDefsDir:    jobDefsDir,
+		modules:       registry,
+		cfg:           cfg,
+		settings:      settings,
+		metadata:      metadata,
+		deps:          itemDeps,
+		macros:        itemMacros,
+		approvals:     itemApprovals,
+		workflows:     workflows,
+		solverResults: solverResults,
+		workstations:  workstations,
 	}
 }
 
@@ -153,6 +203,54 @@ func (s *Server) HandleReady(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// HandleGetModules returns the public module discovery response.
+// No authentication required — clients call this pre-login.
+func (s *Server) HandleGetModules(w http.ResponseWriter, r *http.Request) {
+	mods := make(map[string]any, 10)
+	for _, m := range s.modules.All() {
+		entry := map[string]any{
+			"enabled":  s.modules.IsEnabled(m.ID),
+			"required": m.Required,
+			"name":     m.Name,
+		}
+		if m.Version != "" {
+			entry["version"] = m.Version
+		}
+		if len(m.DependsOn) > 0 {
+			entry["depends_on"] = m.DependsOn
+		}
+
+		// Public config (non-secret) for specific modules.
+		switch m.ID {
+		case "auth":
+			if s.cfg != nil {
+				entry["config"] = map[string]any{
+					"local_enabled":   s.cfg.Auth.Local.Enabled,
+					"ldap_enabled":    s.cfg.Auth.LDAP.Enabled,
+					"oidc_enabled":    s.cfg.Auth.OIDC.Enabled,
+					"oidc_issuer_url": s.cfg.Auth.OIDC.IssuerURL,
+				}
+			}
+		case "freecad":
+			if s.cfg != nil {
+				entry["config"] = map[string]any{
+					"uri_scheme": s.cfg.FreeCAD.URIScheme,
+				}
+			}
+		}
+
+		mods[m.ID] = entry
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"modules": mods,
+		"server": map[string]any{
+			"version":   "0.2",
+			"read_only": s.serverState.IsReadOnly(),
+		},
+	})
+}
+
 // Schema handlers
 
 // SchemaResponse represents a schema in API responses.
@@ -1476,6 +1574,9 @@ func (s *Server) HandleCreateRevision(w http.ResponseWriter, r *http.Request) {
 		"part_number":     partNumber,
 		"revision_number": rev.RevisionNumber,
 	}))
+
+	// Trigger auto-jobs (e.g. validation, export)
+	go s.triggerJobs(context.Background(), "revision_created", item.ID, item)
 }
 
 // HandleUploadFile uploads a file and creates a new revision.
@@ -1575,10 +1676,14 @@ func (s *Server) HandleUploadFile(w http.ResponseWriter, r *http.Request) {
 		Int64("size", result.Size).
 		Msg("file uploaded")
 
+	// .kc metadata extraction (best-effort)
+	s.extractKCMetadata(ctx, item, fileKey, rev)
+
 	writeJSON(w, http.StatusCreated, revisionToResponse(rev))
 }
 
 // HandleDownloadFile downloads the file for a specific revision.
+// For .kc files, silo/ entries are repacked with current DB state.
 func (s *Server) HandleDownloadFile(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 	partNumber := chi.URLParam(r, "partNumber")
@@ -1633,18 +1738,23 @@ func (s *Server) HandleDownloadFile(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Get file from storage
+	// ETag: computed from revision + metadata freshness.
-	var reader interface {
+	meta, _ := s.metadata.Get(ctx, item.ID) // nil is ok (plain .fcstd)
-		Read(p []byte) (n int, err error)
+	etag := computeETag(revision, meta)
-		Close() error
+
+	if match := r.Header.Get("If-None-Match"); match == etag {
+		w.Header().Set("ETag", etag)
+		w.WriteHeader(http.StatusNotModified)
+		return
 	}
 
+	// Get file from storage
+	var reader io.ReadCloser
 	if revision.FileVersion != nil && *revision.FileVersion != "" {
 		reader, err = s.storage.GetVersion(ctx, *revision.FileKey, *revision.FileVersion)
 	} else {
 		reader, err = s.storage.Get(ctx, *revision.FileKey)
 	}
-
 	if err != nil {
 		s.logger.Error().Err(err).Str("key", *revision.FileKey).Msg("failed to get file")
 		writeError(w, http.StatusInternalServerError, "download_failed", err.Error())
@@ -1652,28 +1762,37 @@ func (s *Server) HandleDownloadFile(w http.ResponseWriter, r *http.Request) {
 	}
 	defer reader.Close()
 
+	// Read entire file for potential .kc repacking.
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to read file")
+		writeError(w, http.StatusInternalServerError, "download_failed", "Failed to read file")
+		return
+	}
+
+	// Repack silo/ entries for .kc files with indexed metadata.
+	output := data
+	if meta != nil {
+		if hasSilo, chkErr := kc.HasSiloDir(data); chkErr == nil && hasSilo {
+			if !canSkipRepack(revision, meta) {
+				if packed, packErr := s.packKCFile(ctx, data, item, revision, meta); packErr != nil {
+					s.logger.Warn().Err(packErr).Str("part_number", partNumber).Msg("kc: packing failed, serving original")
+				} else {
+					output = packed
+				}
+			}
+		}
+	}
+
 	// Set response headers
 	filename := partNumber + "_rev" + strconv.Itoa(revNum) + ".FCStd"
 	w.Header().Set("Content-Type", "application/octet-stream")
 	w.Header().Set("Content-Disposition", "attachment; filename=\""+filename+"\"")
-	if revision.FileSize != nil {
+	w.Header().Set("Content-Length", strconv.Itoa(len(output)))
-		w.Header().Set("Content-Length", strconv.FormatInt(*revision.FileSize, 10))
+	w.Header().Set("ETag", etag)
-	}
+	w.Header().Set("Cache-Control", "private, must-revalidate")
 
-	// Stream file to response
+	w.Write(output)
-	buf := make([]byte, 32*1024)
-	for {
-		n, readErr := reader.Read(buf)
-		if n > 0 {
-			if _, writeErr := w.Write(buf[:n]); writeErr != nil {
-				s.logger.Error().Err(writeErr).Msg("failed to write response")
-				return
-			}
-		}
-		if readErr != nil {
-			break
-		}
-	}
 }
 
 // HandleDownloadLatestFile downloads the file for the latest revision.

internal/api/job_handlers.go

@@ -0,0 +1,382 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+)
+
+// HandleListJobs returns jobs filtered by status and/or item.
+func (s *Server) HandleListJobs(w http.ResponseWriter, r *http.Request) {
+	status := r.URL.Query().Get("status")
+	itemID := r.URL.Query().Get("item_id")
+
+	limit := 50
+	if v := r.URL.Query().Get("limit"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 && n <= 200 {
+			limit = n
+		}
+	}
+	offset := 0
+	if v := r.URL.Query().Get("offset"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n >= 0 {
+			offset = n
+		}
+	}
+
+	jobs, err := s.jobs.ListJobs(r.Context(), status, itemID, limit, offset)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list jobs")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list jobs")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, jobs)
+}
+
+// HandleGetJob returns a single job by ID.
+func (s *Server) HandleGetJob(w http.ResponseWriter, r *http.Request) {
+	jobID := chi.URLParam(r, "jobID")
+
+	job, err := s.jobs.GetJob(r.Context(), jobID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get job")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get job")
+		return
+	}
+	if job == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Job not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, job)
+}
+
+// HandleGetJobLogs returns log entries for a job.
+func (s *Server) HandleGetJobLogs(w http.ResponseWriter, r *http.Request) {
+	jobID := chi.URLParam(r, "jobID")
+
+	logs, err := s.jobs.GetJobLogs(r.Context(), jobID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get job logs")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get job logs")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, logs)
+}
+
+// HandleCreateJob manually triggers a job.
+func (s *Server) HandleCreateJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	user := auth.UserFromContext(ctx)
+
+	var req struct {
+		DefinitionName string         `json:"definition_name"`
+		ItemID         *string        `json:"item_id,omitempty"`
+		ProjectID      *string        `json:"project_id,omitempty"`
+		ScopeMetadata  map[string]any `json:"scope_metadata,omitempty"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if req.DefinitionName == "" {
+		writeError(w, http.StatusBadRequest, "missing_field", "definition_name is required")
+		return
+	}
+
+	// Look up definition
+	def, err := s.jobs.GetDefinition(ctx, req.DefinitionName)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to look up job definition")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to look up definition")
+		return
+	}
+	if def == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Job definition not found: "+req.DefinitionName)
+		return
+	}
+
+	var createdBy *string
+	if user != nil {
+		createdBy = &user.Username
+	}
+
+	job := &db.Job{
+		JobDefinitionID: &def.ID,
+		DefinitionName:  def.Name,
+		Priority:        def.Priority,
+		ItemID:          req.ItemID,
+		ProjectID:       req.ProjectID,
+		ScopeMetadata:   req.ScopeMetadata,
+		RunnerTags:      def.RunnerTags,
+		TimeoutSeconds:  def.TimeoutSeconds,
+		MaxRetries:      def.MaxRetries,
+		CreatedBy:       createdBy,
+	}
+
+	if err := s.jobs.CreateJob(ctx, job); err != nil {
+		s.logger.Error().Err(err).Msg("failed to create job")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to create job")
+		return
+	}
+
+	s.broker.Publish("job.created", mustMarshal(map[string]any{
+		"job_id":          job.ID,
+		"definition_name": job.DefinitionName,
+		"item_id":         job.ItemID,
+	}))
+
+	writeJSON(w, http.StatusCreated, job)
+}
+
+// HandleCancelJob cancels a pending or active job.
+func (s *Server) HandleCancelJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	jobID := chi.URLParam(r, "jobID")
+	user := auth.UserFromContext(ctx)
+
+	cancelledBy := "system"
+	if user != nil {
+		cancelledBy = user.Username
+	}
+
+	if err := s.jobs.CancelJob(ctx, jobID, cancelledBy); err != nil {
+		writeError(w, http.StatusBadRequest, "cancel_failed", err.Error())
+		return
+	}
+
+	s.broker.Publish("job.cancelled", mustMarshal(map[string]any{
+		"job_id":       jobID,
+		"cancelled_by": cancelledBy,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "cancelled"})
+}
+
+// HandleListJobDefinitions returns all loaded job definitions.
+func (s *Server) HandleListJobDefinitions(w http.ResponseWriter, r *http.Request) {
+	defs, err := s.jobs.ListDefinitions(r.Context())
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list job definitions")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list definitions")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, defs)
+}
+
+// HandleGetJobDefinition returns a single job definition by name.
+func (s *Server) HandleGetJobDefinition(w http.ResponseWriter, r *http.Request) {
+	name := chi.URLParam(r, "name")
+
+	def, err := s.jobs.GetDefinition(r.Context(), name)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get job definition")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get definition")
+		return
+	}
+	if def == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Job definition not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, def)
+}
+
+// HandleReloadJobDefinitions re-reads YAML files from disk and upserts them.
+func (s *Server) HandleReloadJobDefinitions(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	if s.jobDefsDir == "" {
+		writeError(w, http.StatusBadRequest, "no_directory", "Job definitions directory not configured")
+		return
+	}
+
+	defs, err := loadAndUpsertJobDefs(ctx, s.jobDefsDir, s.jobs)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to reload job definitions")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to reload definitions")
+		return
+	}
+
+	// Update in-memory map
+	s.jobDefs = defs
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"reloaded": len(defs),
+	})
+}
+
+// HandleListRunners returns all registered runners (admin).
+func (s *Server) HandleListRunners(w http.ResponseWriter, r *http.Request) {
+	runners, err := s.jobs.ListRunners(r.Context())
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list runners")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list runners")
+		return
+	}
+
+	// Redact token hashes from response
+	type runnerResponse struct {
+		ID            string         `json:"id"`
+		Name          string         `json:"name"`
+		TokenPrefix   string         `json:"token_prefix"`
+		Tags          []string       `json:"tags"`
+		Status        string         `json:"status"`
+		LastHeartbeat *string        `json:"last_heartbeat,omitempty"`
+		LastJobID     *string        `json:"last_job_id,omitempty"`
+		Metadata      map[string]any `json:"metadata,omitempty"`
+		CreatedAt     string         `json:"created_at"`
+	}
+
+	resp := make([]runnerResponse, len(runners))
+	for i, runner := range runners {
+		var hb *string
+		if runner.LastHeartbeat != nil {
+			s := runner.LastHeartbeat.Format("2006-01-02T15:04:05Z07:00")
+			hb = &s
+		}
+		resp[i] = runnerResponse{
+			ID:            runner.ID,
+			Name:          runner.Name,
+			TokenPrefix:   runner.TokenPrefix,
+			Tags:          runner.Tags,
+			Status:        runner.Status,
+			LastHeartbeat: hb,
+			LastJobID:     runner.LastJobID,
+			Metadata:      runner.Metadata,
+			CreatedAt:     runner.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		}
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// HandleRegisterRunner creates a new runner and returns the token (admin).
+func (s *Server) HandleRegisterRunner(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	var req struct {
+		Name     string         `json:"name"`
+		Tags     []string       `json:"tags"`
+		Metadata map[string]any `json:"metadata,omitempty"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+	if req.Name == "" {
+		writeError(w, http.StatusBadRequest, "missing_field", "name is required")
+		return
+	}
+	if len(req.Tags) == 0 {
+		writeError(w, http.StatusBadRequest, "missing_field", "tags is required (at least one)")
+		return
+	}
+
+	rawToken, tokenHash, tokenPrefix := generateRunnerToken()
+
+	runner := &db.Runner{
+		Name:        req.Name,
+		TokenHash:   tokenHash,
+		TokenPrefix: tokenPrefix,
+		Tags:        req.Tags,
+		Metadata:    req.Metadata,
+	}
+
+	if err := s.jobs.RegisterRunner(ctx, runner); err != nil {
+		s.logger.Error().Err(err).Msg("failed to register runner")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to register runner")
+		return
+	}
+
+	s.broker.Publish("runner.online", mustMarshal(map[string]any{
+		"runner_id": runner.ID,
+		"name":      runner.Name,
+	}))
+
+	writeJSON(w, http.StatusCreated, map[string]any{
+		"id":    runner.ID,
+		"name":  runner.Name,
+		"token": rawToken,
+		"tags":  runner.Tags,
+	})
+}
+
+// HandleDeleteRunner removes a runner (admin).
+func (s *Server) HandleDeleteRunner(w http.ResponseWriter, r *http.Request) {
+	runnerID := chi.URLParam(r, "runnerID")
+
+	if err := s.jobs.DeleteRunner(r.Context(), runnerID); err != nil {
+		writeError(w, http.StatusNotFound, "not_found", err.Error())
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// triggerJobs creates jobs for all enabled definitions matching the trigger type.
+// It applies trigger filters (e.g. item_type) before creating each job.
+func (s *Server) triggerJobs(ctx context.Context, triggerType string, itemID string, item *db.Item) {
+	if !s.modules.IsEnabled("jobs") {
+		return
+	}
+
+	defs, err := s.jobs.GetDefinitionsByTrigger(ctx, triggerType)
+	if err != nil {
+		s.logger.Error().Err(err).Str("trigger", triggerType).Msg("failed to get job definitions for trigger")
+		return
+	}
+
+	for _, def := range defs {
+		// Apply trigger filter (e.g. item_type == "assembly")
+		if def.Definition != nil {
+			if triggerCfg, ok := def.Definition["trigger"].(map[string]any); ok {
+				if filterCfg, ok := triggerCfg["filter"].(map[string]any); ok {
+					if reqType, ok := filterCfg["item_type"].(string); ok && item != nil {
+						if item.ItemType != reqType {
+							continue
+						}
+					}
+				}
+			}
+		}
+
+		job := &db.Job{
+			JobDefinitionID: &def.ID,
+			DefinitionName:  def.Name,
+			Priority:        def.Priority,
+			ItemID:          &itemID,
+			RunnerTags:      def.RunnerTags,
+			TimeoutSeconds:  def.TimeoutSeconds,
+			MaxRetries:      def.MaxRetries,
+		}
+
+		if err := s.jobs.CreateJob(ctx, job); err != nil {
+			s.logger.Error().Err(err).Str("definition", def.Name).Msg("failed to create triggered job")
+			continue
+		}
+
+		s.broker.Publish("job.created", mustMarshal(map[string]any{
+			"job_id":          job.ID,
+			"definition_name": def.Name,
+			"trigger":         triggerType,
+			"item_id":         itemID,
+		}))
+
+		s.logger.Info().
+			Str("job_id", job.ID).
+			Str("definition", def.Name).
+			Str("trigger", triggerType).
+			Str("item_id", itemID).
+			Msg("triggered job")
+	}
+}

internal/api/job_handlers_test.go

@@ -0,0 +1,596 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/modules"
+	"github.com/kindredsystems/silo/internal/schema"
+	"github.com/kindredsystems/silo/internal/testutil"
+	"github.com/rs/zerolog"
+)
+
+func newJobTestServer(t *testing.T) *Server {
+	t.Helper()
+	pool := testutil.MustConnectTestPool(t)
+	database := db.NewFromPool(pool)
+	broker := NewBroker(zerolog.Nop())
+	state := NewServerState(zerolog.Nop(), nil, broker)
+	return NewServer(
+		zerolog.Nop(),
+		database,
+		map[string]*schema.Schema{},
+		"",
+		nil, nil, nil, nil, nil,
+		broker, state,
+		nil, "",
+		modules.NewRegistry(), nil,
+		nil,
+	)
+}
+
+func newJobRouter(s *Server) http.Handler {
+	r := chi.NewRouter()
+	r.Route("/api/jobs", func(r chi.Router) {
+		r.Get("/", s.HandleListJobs)
+		r.Get("/{jobID}", s.HandleGetJob)
+		r.Get("/{jobID}/logs", s.HandleGetJobLogs)
+		r.Post("/", s.HandleCreateJob)
+		r.Post("/{jobID}/cancel", s.HandleCancelJob)
+	})
+	r.Route("/api/job-definitions", func(r chi.Router) {
+		r.Get("/", s.HandleListJobDefinitions)
+		r.Get("/{name}", s.HandleGetJobDefinition)
+	})
+	r.Route("/api/runners", func(r chi.Router) {
+		r.Get("/", s.HandleListRunners)
+		r.Post("/", s.HandleRegisterRunner)
+		r.Delete("/{runnerID}", s.HandleDeleteRunner)
+	})
+	return r
+}
+
+func seedJobDefinition(t *testing.T, s *Server) *db.JobDefinitionRecord {
+	t.Helper()
+	rec := &db.JobDefinitionRecord{
+		Name:           "test-validate",
+		Version:        1,
+		TriggerType:    "manual",
+		ScopeType:      "item",
+		ComputeType:    "validate",
+		RunnerTags:     []string{"create"},
+		TimeoutSeconds: 300,
+		MaxRetries:     1,
+		Priority:       100,
+		Definition:     map[string]any{"compute": map[string]any{"command": "create-validate"}},
+		Enabled:        true,
+	}
+	if err := s.jobs.UpsertDefinition(context.Background(), rec); err != nil {
+		t.Fatalf("seeding job definition: %v", err)
+	}
+	return rec
+}
+
+func TestHandleListJobDefinitions(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	req := httptest.NewRequest("GET", "/api/job-definitions", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var defs []map[string]any
+	json.Unmarshal(w.Body.Bytes(), &defs)
+	if len(defs) == 0 {
+		t.Error("expected at least one definition")
+	}
+}
+
+func TestHandleGetJobDefinition(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	req := httptest.NewRequest("GET", "/api/job-definitions/test-validate", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var def map[string]any
+	json.Unmarshal(w.Body.Bytes(), &def)
+	if def["name"] != "test-validate" {
+		t.Errorf("expected name test-validate, got %v", def["name"])
+	}
+}
+
+func TestHandleCreateAndGetJob(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	// Create a job
+	body := `{"definition_name": "test-validate"}`
+	req := httptest.NewRequest("POST", "/api/jobs", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var job map[string]any
+	json.Unmarshal(w.Body.Bytes(), &job)
+	jobID := job["ID"].(string)
+	if jobID == "" {
+		t.Fatal("job ID is empty")
+	}
+
+	// Get the job
+	req2 := httptest.NewRequest("GET", "/api/jobs/"+jobID, nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("get: expected 200, got %d: %s", w2.Code, w2.Body.String())
+	}
+}
+
+func TestHandleCancelJob(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	// Create a job
+	body := `{"definition_name": "test-validate"}`
+	req := httptest.NewRequest("POST", "/api/jobs", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	var job map[string]any
+	json.Unmarshal(w.Body.Bytes(), &job)
+	jobID := job["ID"].(string)
+
+	// Cancel the job
+	req2 := httptest.NewRequest("POST", "/api/jobs/"+jobID+"/cancel", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("cancel: expected 200, got %d: %s", w2.Code, w2.Body.String())
+	}
+}
+
+func TestHandleListJobs(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	// Create a job
+	body := `{"definition_name": "test-validate"}`
+	req := httptest.NewRequest("POST", "/api/jobs", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	// List jobs
+	req2 := httptest.NewRequest("GET", "/api/jobs", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("list: expected 200, got %d: %s", w2.Code, w2.Body.String())
+	}
+
+	var jobs []map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &jobs)
+	if len(jobs) == 0 {
+		t.Error("expected at least one job")
+	}
+}
+
+func TestHandleListJobs_FilterByStatus(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	seedJobDefinition(t, s)
+
+	// Create a job
+	body := `{"definition_name": "test-validate"}`
+	req := httptest.NewRequest("POST", "/api/jobs", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	// Filter by pending
+	req2 := httptest.NewRequest("GET", "/api/jobs?status=pending", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w2.Code)
+	}
+
+	var jobs []map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &jobs)
+	if len(jobs) == 0 {
+		t.Error("expected pending jobs")
+	}
+
+	// Filter by completed (should be empty)
+	req3 := httptest.NewRequest("GET", "/api/jobs?status=completed", nil)
+	w3 := httptest.NewRecorder()
+	r.ServeHTTP(w3, req3)
+
+	var completedJobs []map[string]any
+	json.Unmarshal(w3.Body.Bytes(), &completedJobs)
+	if len(completedJobs) != 0 {
+		t.Errorf("expected no completed jobs, got %d", len(completedJobs))
+	}
+}
+
+func TestHandleRegisterAndListRunners(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	// Register a runner
+	body := `{"name": "test-runner-1", "tags": ["create", "linux"]}`
+	req := httptest.NewRequest("POST", "/api/runners", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("register: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	var resp map[string]any
+	json.Unmarshal(w.Body.Bytes(), &resp)
+	if resp["token"] == nil || resp["token"] == "" {
+		t.Error("expected a token in response")
+	}
+	if !strings.HasPrefix(resp["token"].(string), "silo_runner_") {
+		t.Errorf("expected token to start with silo_runner_, got %s", resp["token"])
+	}
+
+	// List runners
+	req2 := httptest.NewRequest("GET", "/api/runners", nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Fatalf("list: expected 200, got %d", w2.Code)
+	}
+
+	var runners []map[string]any
+	json.Unmarshal(w2.Body.Bytes(), &runners)
+	if len(runners) == 0 {
+		t.Error("expected at least one runner")
+	}
+	// Token hash should not be exposed
+	for _, runner := range runners {
+		if runner["token_hash"] != nil {
+			t.Error("token_hash should not be in response")
+		}
+	}
+}
+
+func TestHandleDeleteRunner(t *testing.T) {
+	s := newJobTestServer(t)
+	r := newJobRouter(s)
+
+	// Register a runner
+	body := `{"name": "test-runner-delete", "tags": ["create"]}`
+	req := httptest.NewRequest("POST", "/api/runners", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	var resp map[string]any
+	json.Unmarshal(w.Body.Bytes(), &resp)
+	runnerID := resp["id"].(string)
+
+	// Delete the runner
+	req2 := httptest.NewRequest("DELETE", "/api/runners/"+runnerID, nil)
+	w2 := httptest.NewRecorder()
+	r.ServeHTTP(w2, req2)
+
+	if w2.Code != http.StatusNoContent {
+		t.Fatalf("delete: expected 204, got %d: %s", w2.Code, w2.Body.String())
+	}
+}
+
+// --- Trigger integration tests ---
+
+// newTriggerRouter builds a router with items, revisions, BOM, and jobs routes
+// so that HTTP-based actions can fire triggerJobs via goroutine.
+func newTriggerRouter(s *Server) http.Handler {
+	r := chi.NewRouter()
+	r.Route("/api/items", func(r chi.Router) {
+		r.Post("/", s.HandleCreateItem)
+		r.Route("/{partNumber}", func(r chi.Router) {
+			r.Post("/revisions", s.HandleCreateRevision)
+			r.Post("/bom", s.HandleAddBOMEntry)
+			r.Put("/bom/{childPartNumber}", s.HandleUpdateBOMEntry)
+			r.Delete("/bom/{childPartNumber}", s.HandleDeleteBOMEntry)
+		})
+	})
+	r.Route("/api/jobs", func(r chi.Router) {
+		r.Get("/", s.HandleListJobs)
+	})
+	return r
+}
+
+func waitForJobs(t *testing.T, s *Server, itemID string, wantCount int) []*db.Job {
+	t.Helper()
+	// triggerJobs runs in a goroutine; poll up to 2 seconds.
+	for i := 0; i < 20; i++ {
+		jobs, err := s.jobs.ListJobs(context.Background(), "", itemID, 50, 0)
+		if err != nil {
+			t.Fatalf("listing jobs: %v", err)
+		}
+		if len(jobs) >= wantCount {
+			return jobs
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+	jobs, _ := s.jobs.ListJobs(context.Background(), "", itemID, 50, 0)
+	return jobs
+}
+
+func TestTriggerJobsOnRevisionCreate(t *testing.T) {
+	s := newJobTestServer(t)
+	if err := s.modules.SetEnabled("jobs", true); err != nil {
+		t.Fatalf("enabling jobs module: %v", err)
+	}
+	router := newTriggerRouter(s)
+
+	// Create an item.
+	createItemDirect(t, s, "TRIG-REV-001", "trigger test item", nil)
+
+	// Seed a job definition that triggers on revision_created.
+	def := &db.JobDefinitionRecord{
+		Name:           "rev-trigger-test",
+		Version:        1,
+		TriggerType:    "revision_created",
+		ScopeType:      "item",
+		ComputeType:    "validate",
+		RunnerTags:     []string{"test"},
+		TimeoutSeconds: 60,
+		MaxRetries:     0,
+		Priority:       100,
+		Enabled:        true,
+	}
+	if err := s.jobs.UpsertDefinition(context.Background(), def); err != nil {
+		t.Fatalf("seeding definition: %v", err)
+	}
+
+	// Create a revision via HTTP (fires triggerJobs in goroutine).
+	body := `{"properties":{"material":"steel"},"comment":"trigger test"}`
+	req := authRequest(httptest.NewRequest("POST", "/api/items/TRIG-REV-001/revisions", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create revision: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	// Get the item ID to filter jobs.
+	item, _ := s.items.GetByPartNumber(context.Background(), "TRIG-REV-001")
+	if item == nil {
+		t.Fatal("item not found after creation")
+	}
+
+	jobs := waitForJobs(t, s, item.ID, 1)
+	if len(jobs) == 0 {
+		t.Fatal("expected at least 1 triggered job, got 0")
+	}
+	if jobs[0].DefinitionName != "rev-trigger-test" {
+		t.Errorf("expected definition name rev-trigger-test, got %s", jobs[0].DefinitionName)
+	}
+}
+
+func TestTriggerJobsOnBOMChange(t *testing.T) {
+	s := newJobTestServer(t)
+	if err := s.modules.SetEnabled("jobs", true); err != nil {
+		t.Fatalf("enabling jobs module: %v", err)
+	}
+	router := newTriggerRouter(s)
+
+	// Create parent and child items.
+	createItemDirect(t, s, "TRIG-BOM-P", "parent", nil)
+	createItemDirect(t, s, "TRIG-BOM-C", "child", nil)
+
+	// Seed a bom_changed job definition.
+	def := &db.JobDefinitionRecord{
+		Name:           "bom-trigger-test",
+		Version:        1,
+		TriggerType:    "bom_changed",
+		ScopeType:      "item",
+		ComputeType:    "validate",
+		RunnerTags:     []string{"test"},
+		TimeoutSeconds: 60,
+		MaxRetries:     0,
+		Priority:       100,
+		Enabled:        true,
+	}
+	if err := s.jobs.UpsertDefinition(context.Background(), def); err != nil {
+		t.Fatalf("seeding definition: %v", err)
+	}
+
+	// Add a BOM entry via HTTP.
+	body := `{"child_part_number":"TRIG-BOM-C","rel_type":"component","quantity":2}`
+	req := authRequest(httptest.NewRequest("POST", "/api/items/TRIG-BOM-P/bom", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("add BOM entry: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	// Get the parent item ID.
+	parent, _ := s.items.GetByPartNumber(context.Background(), "TRIG-BOM-P")
+	if parent == nil {
+		t.Fatal("parent item not found")
+	}
+
+	jobs := waitForJobs(t, s, parent.ID, 1)
+	if len(jobs) == 0 {
+		t.Fatal("expected at least 1 triggered job, got 0")
+	}
+	if jobs[0].DefinitionName != "bom-trigger-test" {
+		t.Errorf("expected definition name bom-trigger-test, got %s", jobs[0].DefinitionName)
+	}
+}
+
+func TestTriggerJobsFilterMismatch(t *testing.T) {
+	s := newJobTestServer(t)
+	if err := s.modules.SetEnabled("jobs", true); err != nil {
+		t.Fatalf("enabling jobs module: %v", err)
+	}
+	router := newTriggerRouter(s)
+
+	// Create a "part" type item (not "assembly").
+	createItemDirect(t, s, "TRIG-FILT-P", "filter parent", nil)
+	createItemDirect(t, s, "TRIG-FILT-C", "filter child", nil)
+
+	// Seed a definition that only triggers for assembly items.
+	def := &db.JobDefinitionRecord{
+		Name:           "assembly-only-test",
+		Version:        1,
+		TriggerType:    "bom_changed",
+		ScopeType:      "item",
+		ComputeType:    "validate",
+		RunnerTags:     []string{"test"},
+		TimeoutSeconds: 60,
+		MaxRetries:     0,
+		Priority:       100,
+		Enabled:        true,
+		Definition: map[string]any{
+			"trigger": map[string]any{
+				"filter": map[string]any{
+					"item_type": "assembly",
+				},
+			},
+		},
+	}
+	if err := s.jobs.UpsertDefinition(context.Background(), def); err != nil {
+		t.Fatalf("seeding definition: %v", err)
+	}
+
+	// Add a BOM entry on a "part" item (should NOT match assembly filter).
+	body := `{"child_part_number":"TRIG-FILT-C","rel_type":"component","quantity":1}`
+	req := authRequest(httptest.NewRequest("POST", "/api/items/TRIG-FILT-P/bom", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("add BOM entry: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	// Wait briefly, then verify no jobs were created.
+	parent, _ := s.items.GetByPartNumber(context.Background(), "TRIG-FILT-P")
+	time.Sleep(500 * time.Millisecond)
+
+	jobs, err := s.jobs.ListJobs(context.Background(), "", parent.ID, 50, 0)
+	if err != nil {
+		t.Fatalf("listing jobs: %v", err)
+	}
+	if len(jobs) != 0 {
+		t.Errorf("expected 0 jobs (filter mismatch), got %d", len(jobs))
+	}
+}
+
+func TestTriggerJobsModuleDisabled(t *testing.T) {
+	s := newJobTestServer(t)
+	// Jobs module is disabled by default in NewRegistry().
+	router := newTriggerRouter(s)
+
+	// Create items.
+	createItemDirect(t, s, "TRIG-DIS-P", "disabled parent", nil)
+	createItemDirect(t, s, "TRIG-DIS-C", "disabled child", nil)
+
+	// Seed a bom_changed definition (it exists in DB but module is off).
+	def := &db.JobDefinitionRecord{
+		Name:           "disabled-trigger-test",
+		Version:        1,
+		TriggerType:    "bom_changed",
+		ScopeType:      "item",
+		ComputeType:    "validate",
+		RunnerTags:     []string{"test"},
+		TimeoutSeconds: 60,
+		MaxRetries:     0,
+		Priority:       100,
+		Enabled:        true,
+	}
+	if err := s.jobs.UpsertDefinition(context.Background(), def); err != nil {
+		t.Fatalf("seeding definition: %v", err)
+	}
+
+	// Add a BOM entry with jobs module disabled.
+	body := `{"child_part_number":"TRIG-DIS-C","rel_type":"component","quantity":1}`
+	req := authRequest(httptest.NewRequest("POST", "/api/items/TRIG-DIS-P/bom", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("add BOM entry: expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	// Wait briefly, then verify no jobs were created.
+	parent, _ := s.items.GetByPartNumber(context.Background(), "TRIG-DIS-P")
+	time.Sleep(500 * time.Millisecond)
+
+	jobs, err := s.jobs.ListJobs(context.Background(), "", parent.ID, 50, 0)
+	if err != nil {
+		t.Fatalf("listing jobs: %v", err)
+	}
+	if len(jobs) != 0 {
+		t.Errorf("expected 0 jobs (module disabled), got %d", len(jobs))
+	}
+}
+
+func TestGenerateRunnerToken(t *testing.T) {
+	raw, hash, prefix := generateRunnerToken()
+
+	if !strings.HasPrefix(raw, "silo_runner_") {
+		t.Errorf("raw token should start with silo_runner_, got %s", raw[:20])
+	}
+	if len(hash) != 64 {
+		t.Errorf("hash should be 64 hex chars, got %d", len(hash))
+	}
+	if len(prefix) != 20 {
+		t.Errorf("prefix should be 20 chars, got %d: %s", len(prefix), prefix)
+	}
+
+	// Two tokens should be different
+	raw2, _, _ := generateRunnerToken()
+	if raw == raw2 {
+		t.Error("two generated tokens should be different")
+	}
+}

internal/api/location_handlers.go

@@ -0,0 +1,234 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/db"
+)
+
+// LocationResponse is the API representation of a location.
+type LocationResponse struct {
+	ID           string         `json:"id"`
+	Path         string         `json:"path"`
+	Name         string         `json:"name"`
+	ParentID     *string        `json:"parent_id,omitempty"`
+	LocationType string         `json:"location_type"`
+	Depth        int            `json:"depth"`
+	Metadata     map[string]any `json:"metadata,omitempty"`
+	CreatedAt    string         `json:"created_at"`
+}
+
+// CreateLocationRequest represents a request to create a location.
+type CreateLocationRequest struct {
+	Path         string         `json:"path"`
+	Name         string         `json:"name"`
+	LocationType string         `json:"location_type"`
+	Metadata     map[string]any `json:"metadata,omitempty"`
+}
+
+// UpdateLocationRequest represents a request to update a location.
+type UpdateLocationRequest struct {
+	Name         string         `json:"name"`
+	LocationType string         `json:"location_type"`
+	Metadata     map[string]any `json:"metadata,omitempty"`
+}
+
+func locationToResponse(loc *db.Location) LocationResponse {
+	return LocationResponse{
+		ID:           loc.ID,
+		Path:         loc.Path,
+		Name:         loc.Name,
+		ParentID:     loc.ParentID,
+		LocationType: loc.LocationType,
+		Depth:        loc.Depth,
+		Metadata:     loc.Metadata,
+		CreatedAt:    loc.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+	}
+}
+
+// HandleListLocations lists all locations. If ?tree={path} is set, returns that
+// subtree. If ?root=true, returns only root-level locations (depth 0).
+func (s *Server) HandleListLocations(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	treePath := r.URL.Query().Get("tree")
+	if treePath != "" {
+		locs, err := s.locations.GetTree(ctx, treePath)
+		if err != nil {
+			s.logger.Error().Err(err).Str("tree", treePath).Msg("failed to get location tree")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get location tree")
+			return
+		}
+		writeJSON(w, http.StatusOK, locationsToResponse(locs))
+		return
+	}
+
+	locs, err := s.locations.List(ctx)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list locations")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list locations")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, locationsToResponse(locs))
+}
+
+// HandleCreateLocation creates a new location.
+func (s *Server) HandleCreateLocation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	var req CreateLocationRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_json", err.Error())
+		return
+	}
+
+	if req.Path == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Path is required")
+		return
+	}
+	if req.Name == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Name is required")
+		return
+	}
+	if req.LocationType == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Location type is required")
+		return
+	}
+
+	// Normalize: trim slashes
+	req.Path = strings.Trim(req.Path, "/")
+
+	loc := &db.Location{
+		Path:         req.Path,
+		Name:         req.Name,
+		LocationType: req.LocationType,
+		Metadata:     req.Metadata,
+	}
+	if loc.Metadata == nil {
+		loc.Metadata = map[string]any{}
+	}
+
+	if err := s.locations.Create(ctx, loc); err != nil {
+		if strings.Contains(err.Error(), "parent location") || strings.Contains(err.Error(), "does not exist") {
+			writeError(w, http.StatusBadRequest, "invalid_parent", err.Error())
+			return
+		}
+		if strings.Contains(err.Error(), "duplicate key") || strings.Contains(err.Error(), "unique") {
+			writeError(w, http.StatusConflict, "already_exists", "Location path already exists")
+			return
+		}
+		s.logger.Error().Err(err).Str("path", req.Path).Msg("failed to create location")
+		writeError(w, http.StatusInternalServerError, "create_failed", err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, locationToResponse(loc))
+}
+
+// HandleGetLocation retrieves a location by path. The path is the rest of the
+// URL after /api/locations/, which chi captures as a wildcard.
+func (s *Server) HandleGetLocation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	path := strings.Trim(chi.URLParam(r, "*"), "/")
+
+	if path == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Location path is required")
+		return
+	}
+
+	loc, err := s.locations.GetByPath(ctx, path)
+	if err != nil {
+		s.logger.Error().Err(err).Str("path", path).Msg("failed to get location")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get location")
+		return
+	}
+	if loc == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Location not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, locationToResponse(loc))
+}
+
+// HandleUpdateLocation updates a location by path.
+func (s *Server) HandleUpdateLocation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	path := strings.Trim(chi.URLParam(r, "*"), "/")
+
+	if path == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Location path is required")
+		return
+	}
+
+	var req UpdateLocationRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_json", err.Error())
+		return
+	}
+
+	if req.Name == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Name is required")
+		return
+	}
+	if req.LocationType == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Location type is required")
+		return
+	}
+
+	meta := req.Metadata
+	if meta == nil {
+		meta = map[string]any{}
+	}
+
+	if err := s.locations.Update(ctx, path, req.Name, req.LocationType, meta); err != nil {
+		if strings.Contains(err.Error(), "not found") {
+			writeError(w, http.StatusNotFound, "not_found", "Location not found")
+			return
+		}
+		s.logger.Error().Err(err).Str("path", path).Msg("failed to update location")
+		writeError(w, http.StatusInternalServerError, "update_failed", err.Error())
+		return
+	}
+
+	loc, _ := s.locations.GetByPath(ctx, path)
+	writeJSON(w, http.StatusOK, locationToResponse(loc))
+}
+
+// HandleDeleteLocation deletes a location by path. Rejects if inventory exists.
+func (s *Server) HandleDeleteLocation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	path := strings.Trim(chi.URLParam(r, "*"), "/")
+
+	if path == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "Location path is required")
+		return
+	}
+
+	if err := s.locations.Delete(ctx, path); err != nil {
+		if strings.Contains(err.Error(), "inventory record") {
+			writeError(w, http.StatusConflict, "has_inventory", err.Error())
+			return
+		}
+		if strings.Contains(err.Error(), "not found") {
+			writeError(w, http.StatusNotFound, "not_found", "Location not found")
+			return
+		}
+		s.logger.Error().Err(err).Str("path", path).Msg("failed to delete location")
+		writeError(w, http.StatusInternalServerError, "delete_failed", err.Error())
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+func locationsToResponse(locs []*db.Location) []LocationResponse {
+	result := make([]LocationResponse, len(locs))
+	for i, l := range locs {
+		result[i] = locationToResponse(l)
+	}
+	return result
+}

internal/api/location_handlers_test.go

@@ -0,0 +1,323 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/go-chi/chi/v5"
+)
+
+func newLocationRouter(s *Server) http.Handler {
+	r := chi.NewRouter()
+	r.Get("/api/locations", s.HandleListLocations)
+	r.Post("/api/locations", s.HandleCreateLocation)
+	r.Get("/api/locations/*", s.HandleGetLocation)
+	r.Put("/api/locations/*", s.HandleUpdateLocation)
+	r.Delete("/api/locations/*", s.HandleDeleteLocation)
+	return r
+}
+
+func TestHandleListLocationsEmpty(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	req := httptest.NewRequest("GET", "/api/locations", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var locs []LocationResponse
+	if err := json.Unmarshal(w.Body.Bytes(), &locs); err != nil {
+		t.Fatalf("decoding response: %v", err)
+	}
+	if len(locs) != 0 {
+		t.Fatalf("expected 0 locations, got %d", len(locs))
+	}
+}
+
+func TestHandleCreateAndGetLocation(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	// Create root location
+	body := `{"path": "lab", "name": "Lab", "location_type": "building"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create status: got %d, want %d; body: %s", w.Code, http.StatusCreated, w.Body.String())
+	}
+
+	var created LocationResponse
+	if err := json.Unmarshal(w.Body.Bytes(), &created); err != nil {
+		t.Fatalf("decoding create response: %v", err)
+	}
+	if created.Path != "lab" {
+		t.Errorf("path: got %q, want %q", created.Path, "lab")
+	}
+	if created.Name != "Lab" {
+		t.Errorf("name: got %q, want %q", created.Name, "Lab")
+	}
+	if created.Depth != 0 {
+		t.Errorf("depth: got %d, want 0", created.Depth)
+	}
+	if created.ID == "" {
+		t.Error("expected ID to be set")
+	}
+
+	// Get by path
+	req = httptest.NewRequest("GET", "/api/locations/lab", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("get status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var got LocationResponse
+	if err := json.Unmarshal(w.Body.Bytes(), &got); err != nil {
+		t.Fatalf("decoding get response: %v", err)
+	}
+	if got.ID != created.ID {
+		t.Errorf("ID mismatch: got %q, want %q", got.ID, created.ID)
+	}
+}
+
+func TestHandleCreateNestedLocation(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	// Create root
+	body := `{"path": "warehouse", "name": "Warehouse", "location_type": "building"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create root: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	// Create child
+	body = `{"path": "warehouse/shelf-a", "name": "Shelf A", "location_type": "shelf"}`
+	req = httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create child: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var child LocationResponse
+	json.Unmarshal(w.Body.Bytes(), &child)
+	if child.Depth != 1 {
+		t.Errorf("child depth: got %d, want 1", child.Depth)
+	}
+	if child.ParentID == nil {
+		t.Error("expected parent_id to be set")
+	}
+
+	// Create grandchild
+	body = `{"path": "warehouse/shelf-a/bin-3", "name": "Bin 3", "location_type": "bin"}`
+	req = httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create grandchild: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var gc LocationResponse
+	json.Unmarshal(w.Body.Bytes(), &gc)
+	if gc.Depth != 2 {
+		t.Errorf("grandchild depth: got %d, want 2", gc.Depth)
+	}
+
+	// Get nested path
+	req = httptest.NewRequest("GET", "/api/locations/warehouse/shelf-a/bin-3", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("get nested: got %d; body: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestHandleCreateLocationMissingParent(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	body := `{"path": "nonexistent/child", "name": "Child", "location_type": "shelf"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400, got %d; body: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestHandleUpdateLocation(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	// Create
+	body := `{"path": "office", "name": "Office", "location_type": "room"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	// Update
+	body = `{"name": "Main Office", "location_type": "building", "metadata": {"floor": 2}}`
+	req = httptest.NewRequest("PUT", "/api/locations/office", strings.NewReader(body))
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("update: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var updated LocationResponse
+	json.Unmarshal(w.Body.Bytes(), &updated)
+	if updated.Name != "Main Office" {
+		t.Errorf("name: got %q, want %q", updated.Name, "Main Office")
+	}
+	if updated.LocationType != "building" {
+		t.Errorf("type: got %q, want %q", updated.LocationType, "building")
+	}
+}
+
+func TestHandleDeleteLocation(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	// Create
+	body := `{"path": "temp", "name": "Temp", "location_type": "area"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("create: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	// Delete
+	req = httptest.NewRequest("DELETE", "/api/locations/temp", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusNoContent {
+		t.Fatalf("delete: got %d, want %d; body: %s", w.Code, http.StatusNoContent, w.Body.String())
+	}
+
+	// Verify gone
+	req = httptest.NewRequest("GET", "/api/locations/temp", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("get after delete: got %d, want %d", w.Code, http.StatusNotFound)
+	}
+}
+
+func TestHandleDeleteLocationNotFound(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	req := httptest.NewRequest("DELETE", "/api/locations/doesnotexist", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("delete missing: got %d, want %d; body: %s", w.Code, http.StatusNotFound, w.Body.String())
+	}
+}
+
+func TestHandleListLocationsTree(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	// Create hierarchy
+	for _, loc := range []string{
+		`{"path": "site", "name": "Site", "location_type": "site"}`,
+		`{"path": "site/bldg", "name": "Building", "location_type": "building"}`,
+		`{"path": "site/bldg/room1", "name": "Room 1", "location_type": "room"}`,
+		`{"path": "other", "name": "Other", "location_type": "site"}`,
+	} {
+		req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(loc))
+		w := httptest.NewRecorder()
+		router.ServeHTTP(w, req)
+		if w.Code != http.StatusCreated {
+			t.Fatalf("create: got %d; body: %s", w.Code, w.Body.String())
+		}
+	}
+
+	// List tree under "site"
+	req := httptest.NewRequest("GET", "/api/locations?tree=site", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("tree: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	var locs []LocationResponse
+	json.Unmarshal(w.Body.Bytes(), &locs)
+	if len(locs) != 3 {
+		t.Fatalf("tree count: got %d, want 3 (site + bldg + room1)", len(locs))
+	}
+
+	// Full list should have 4
+	req = httptest.NewRequest("GET", "/api/locations", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	json.Unmarshal(w.Body.Bytes(), &locs)
+	if len(locs) != 4 {
+		t.Fatalf("full list: got %d, want 4", len(locs))
+	}
+}
+
+func TestHandleCreateLocationDuplicate(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	body := `{"path": "dup", "name": "Dup", "location_type": "area"}`
+	req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusCreated {
+		t.Fatalf("first create: got %d; body: %s", w.Code, w.Body.String())
+	}
+
+	// Duplicate
+	req = httptest.NewRequest("POST", "/api/locations", strings.NewReader(body))
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusConflict {
+		t.Fatalf("duplicate: got %d, want %d; body: %s", w.Code, http.StatusConflict, w.Body.String())
+	}
+}
+
+func TestHandleCreateLocationValidation(t *testing.T) {
+	s := newTestServer(t)
+	router := newLocationRouter(s)
+
+	tests := []struct {
+		name string
+		body string
+	}{
+		{"missing path", `{"name": "X", "location_type": "area"}`},
+		{"missing name", `{"path": "x", "location_type": "area"}`},
+		{"missing type", `{"path": "x", "name": "X"}`},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			req := httptest.NewRequest("POST", "/api/locations", strings.NewReader(tc.body))
+			w := httptest.NewRecorder()
+			router.ServeHTTP(w, req)
+			if w.Code != http.StatusBadRequest {
+				t.Fatalf("got %d, want 400; body: %s", w.Code, w.Body.String())
+			}
+		})
+	}
+}

internal/api/macro_handlers.go

@@ -0,0 +1,95 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+)
+
+// MacroListItem is the JSON representation for GET /macros list entries.
+type MacroListItem struct {
+	Filename       string `json:"filename"`
+	Trigger        string `json:"trigger"`
+	RevisionNumber int    `json:"revision_number"`
+}
+
+// MacroResponse is the JSON representation for GET /macros/{filename}.
+type MacroResponse struct {
+	Filename       string `json:"filename"`
+	Trigger        string `json:"trigger"`
+	Content        string `json:"content"`
+	RevisionNumber int    `json:"revision_number"`
+}
+
+// HandleGetMacros returns the list of registered macros for an item.
+// GET /api/items/{partNumber}/macros
+func (s *Server) HandleGetMacros(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	macros, err := s.macros.ListByItem(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list macros")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list macros")
+		return
+	}
+
+	resp := make([]MacroListItem, len(macros))
+	for i, m := range macros {
+		resp[i] = MacroListItem{
+			Filename:       m.Filename,
+			Trigger:        m.Trigger,
+			RevisionNumber: m.RevisionNumber,
+		}
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// HandleGetMacro returns a single macro's source content.
+// GET /api/items/{partNumber}/macros/{filename}
+func (s *Server) HandleGetMacro(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+	filename := chi.URLParam(r, "filename")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	macro, err := s.macros.GetByFilename(ctx, item.ID, filename)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get macro")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get macro")
+		return
+	}
+	if macro == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Macro not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, MacroResponse{
+		Filename:       macro.Filename,
+		Trigger:        macro.Trigger,
+		Content:        macro.Content,
+		RevisionNumber: macro.RevisionNumber,
+	})
+}

internal/api/metadata_handlers.go

@@ -0,0 +1,472 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/kc"
+)
+
+// validTransitions defines allowed lifecycle state transitions for Phase 1.
+var validTransitions = map[string][]string{
+	"draft":    {"review"},
+	"review":   {"draft", "released"},
+	"released": {"obsolete"},
+	"obsolete": {},
+}
+
+// MetadataResponse is the JSON representation returned by GET /metadata.
+type MetadataResponse struct {
+	SchemaName     *string        `json:"schema_name"`
+	LifecycleState string         `json:"lifecycle_state"`
+	Tags           []string       `json:"tags"`
+	Fields         map[string]any `json:"fields"`
+	Manifest       *ManifestInfo  `json:"manifest,omitempty"`
+	UpdatedAt      string         `json:"updated_at"`
+	UpdatedBy      *string        `json:"updated_by,omitempty"`
+}
+
+// ManifestInfo is the manifest subset included in MetadataResponse.
+type ManifestInfo struct {
+	UUID         *string `json:"uuid,omitempty"`
+	SiloInstance *string `json:"silo_instance,omitempty"`
+	RevisionHash *string `json:"revision_hash,omitempty"`
+	KCVersion    *string `json:"kc_version,omitempty"`
+}
+
+func metadataToResponse(m *db.ItemMetadata) MetadataResponse {
+	resp := MetadataResponse{
+		SchemaName:     m.SchemaName,
+		LifecycleState: m.LifecycleState,
+		Tags:           m.Tags,
+		Fields:         m.Fields,
+		UpdatedAt:      m.UpdatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+		UpdatedBy:      m.UpdatedBy,
+	}
+	if m.ManifestUUID != nil || m.SiloInstance != nil || m.RevisionHash != nil || m.KCVersion != nil {
+		resp.Manifest = &ManifestInfo{
+			UUID:         m.ManifestUUID,
+			SiloInstance: m.SiloInstance,
+			RevisionHash: m.RevisionHash,
+			KCVersion:    m.KCVersion,
+		}
+	}
+	return resp
+}
+
+// HandleGetMetadata returns indexed metadata for an item.
+// GET /api/items/{partNumber}/metadata
+func (s *Server) HandleGetMetadata(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	meta, err := s.metadata.Get(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get metadata")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get metadata")
+		return
+	}
+	if meta == nil {
+		writeError(w, http.StatusNotFound, "not_found", "No metadata indexed for this item")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, metadataToResponse(meta))
+}
+
+// HandleUpdateMetadata merges fields into the metadata JSONB.
+// PUT /api/items/{partNumber}/metadata
+func (s *Server) HandleUpdateMetadata(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	var req struct {
+		Fields map[string]any `json:"fields"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+	if len(req.Fields) == 0 {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Fields must not be empty")
+		return
+	}
+
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	if err := s.metadata.UpdateFields(ctx, item.ID, req.Fields, username); err != nil {
+		s.logger.Error().Err(err).Msg("failed to update metadata fields")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to update metadata")
+		return
+	}
+
+	meta, err := s.metadata.Get(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to read back metadata")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to read metadata")
+		return
+	}
+
+	s.broker.Publish("metadata.updated", mustMarshal(map[string]any{
+		"part_number":     partNumber,
+		"changed_fields":  fieldKeys(req.Fields),
+		"lifecycle_state": meta.LifecycleState,
+		"updated_by":      username,
+	}))
+
+	writeJSON(w, http.StatusOK, metadataToResponse(meta))
+}
+
+// HandleUpdateLifecycle transitions the lifecycle state.
+// PATCH /api/items/{partNumber}/metadata/lifecycle
+func (s *Server) HandleUpdateLifecycle(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	var req struct {
+		State string `json:"state"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+	if req.State == "" {
+		writeError(w, http.StatusBadRequest, "invalid_body", "State is required")
+		return
+	}
+
+	meta, err := s.metadata.Get(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get metadata")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get metadata")
+		return
+	}
+	if meta == nil {
+		writeError(w, http.StatusNotFound, "not_found", "No metadata indexed for this item")
+		return
+	}
+
+	// Validate transition
+	allowed := validTransitions[meta.LifecycleState]
+	valid := false
+	for _, s := range allowed {
+		if s == req.State {
+			valid = true
+			break
+		}
+	}
+	if !valid {
+		writeError(w, http.StatusUnprocessableEntity, "invalid_transition",
+			"Cannot transition from '"+meta.LifecycleState+"' to '"+req.State+"'")
+		return
+	}
+
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	fromState := meta.LifecycleState
+	if err := s.metadata.UpdateLifecycle(ctx, item.ID, req.State, username); err != nil {
+		s.logger.Error().Err(err).Msg("failed to update lifecycle")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to update lifecycle")
+		return
+	}
+
+	s.broker.Publish("metadata.lifecycle", mustMarshal(map[string]any{
+		"part_number": partNumber,
+		"from_state":  fromState,
+		"to_state":    req.State,
+		"updated_by":  username,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{"lifecycle_state": req.State})
+}
+
+// HandleUpdateTags adds/removes tags.
+// PATCH /api/items/{partNumber}/metadata/tags
+func (s *Server) HandleUpdateTags(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	var req struct {
+		Add    []string `json:"add"`
+		Remove []string `json:"remove"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+	if len(req.Add) == 0 && len(req.Remove) == 0 {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Must provide 'add' or 'remove'")
+		return
+	}
+
+	meta, err := s.metadata.Get(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get metadata")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get metadata")
+		return
+	}
+	if meta == nil {
+		writeError(w, http.StatusNotFound, "not_found", "No metadata indexed for this item")
+		return
+	}
+
+	// Compute new tag set: (existing + add) - remove
+	tagSet := make(map[string]struct{})
+	for _, t := range meta.Tags {
+		tagSet[t] = struct{}{}
+	}
+	for _, t := range req.Add {
+		tagSet[t] = struct{}{}
+	}
+	removeSet := make(map[string]struct{})
+	for _, t := range req.Remove {
+		removeSet[t] = struct{}{}
+	}
+	var newTags []string
+	for t := range tagSet {
+		if _, removed := removeSet[t]; !removed {
+			newTags = append(newTags, t)
+		}
+	}
+	if newTags == nil {
+		newTags = []string{}
+	}
+
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	if err := s.metadata.SetTags(ctx, item.ID, newTags, username); err != nil {
+		s.logger.Error().Err(err).Msg("failed to update tags")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to update tags")
+		return
+	}
+
+	s.broker.Publish("metadata.tags", mustMarshal(map[string]any{
+		"part_number": partNumber,
+		"added":       req.Add,
+		"removed":     req.Remove,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]any{"tags": newTags})
+}
+
+// extractKCMetadata attempts to extract and index silo/ metadata from an
+// uploaded .kc file. Failures are logged but non-fatal for Phase 1.
+func (s *Server) extractKCMetadata(ctx context.Context, item *db.Item, fileKey string, rev *db.Revision) {
+	if s.storage == nil {
+		return
+	}
+
+	reader, err := s.storage.Get(ctx, fileKey)
+	if err != nil {
+		s.logger.Warn().Err(err).Str("file_key", fileKey).Msg("kc: failed to read back file for extraction")
+		return
+	}
+	defer reader.Close()
+
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		s.logger.Warn().Err(err).Msg("kc: failed to read file bytes")
+		return
+	}
+
+	result, err := kc.Extract(data)
+	if err != nil {
+		s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: extraction failed")
+		return
+	}
+	if result == nil {
+		return // plain .fcstd, no silo/ directory
+	}
+
+	// Validate manifest UUID matches item
+	if result.Manifest != nil && result.Manifest.UUID != "" && result.Manifest.UUID != item.ID {
+		s.logger.Warn().
+			Str("manifest_uuid", result.Manifest.UUID).
+			Str("item_id", item.ID).
+			Msg("kc: manifest UUID does not match item, skipping indexing")
+		return
+	}
+
+	// Check for no-op (revision_hash unchanged)
+	if result.Manifest != nil && result.Manifest.RevisionHash != "" {
+		existing, _ := s.metadata.Get(ctx, item.ID)
+		if existing != nil && existing.RevisionHash != nil && *existing.RevisionHash == result.Manifest.RevisionHash {
+			s.logger.Debug().Str("part_number", item.PartNumber).Msg("kc: revision_hash unchanged, skipping")
+			return
+		}
+	}
+
+	username := ""
+	if rev.CreatedBy != nil {
+		username = *rev.CreatedBy
+	}
+
+	meta := &db.ItemMetadata{
+		ItemID:         item.ID,
+		LifecycleState: "draft",
+		Fields:         make(map[string]any),
+		Tags:           []string{},
+		UpdatedBy:      strPtr(username),
+	}
+
+	if result.Manifest != nil {
+		meta.KCVersion = strPtr(result.Manifest.KCVersion)
+		meta.ManifestUUID = strPtr(result.Manifest.UUID)
+		meta.SiloInstance = strPtr(result.Manifest.SiloInstance)
+		meta.RevisionHash = strPtr(result.Manifest.RevisionHash)
+	}
+
+	if result.Metadata != nil {
+		meta.SchemaName = strPtr(result.Metadata.SchemaName)
+		if result.Metadata.Tags != nil {
+			meta.Tags = result.Metadata.Tags
+		}
+		if result.Metadata.LifecycleState != "" {
+			meta.LifecycleState = result.Metadata.LifecycleState
+		}
+		if result.Metadata.Fields != nil {
+			meta.Fields = result.Metadata.Fields
+		}
+	}
+
+	if err := s.metadata.Upsert(ctx, meta); err != nil {
+		s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: failed to upsert metadata")
+		return
+	}
+
+	s.broker.Publish("metadata.updated", mustMarshal(map[string]any{
+		"part_number":     item.PartNumber,
+		"lifecycle_state": meta.LifecycleState,
+		"updated_by":      username,
+	}))
+
+	// Index dependencies from silo/dependencies.json.
+	if result.Dependencies != nil {
+		dbDeps := make([]*db.ItemDependency, len(result.Dependencies))
+		for i, d := range result.Dependencies {
+			pn := d.PartNumber
+			rev := d.Revision
+			qty := d.Quantity
+			label := d.Label
+			rel := d.Relationship
+			if rel == "" {
+				rel = "component"
+			}
+			dbDeps[i] = &db.ItemDependency{
+				ParentItemID:    item.ID,
+				ChildUUID:       d.UUID,
+				ChildPartNumber: &pn,
+				ChildRevision:   &rev,
+				Quantity:        &qty,
+				Label:           &label,
+				Relationship:    rel,
+			}
+		}
+		if err := s.deps.ReplaceForRevision(ctx, item.ID, rev.RevisionNumber, dbDeps); err != nil {
+			s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: failed to index dependencies")
+		} else {
+			s.broker.Publish("dependencies.changed", mustMarshal(map[string]any{
+				"part_number": item.PartNumber,
+				"count":       len(dbDeps),
+			}))
+		}
+	}
+
+	// Index macros from silo/macros/*.
+	if len(result.Macros) > 0 {
+		dbMacros := make([]*db.ItemMacro, len(result.Macros))
+		for i, m := range result.Macros {
+			dbMacros[i] = &db.ItemMacro{
+				ItemID:   item.ID,
+				Filename: m.Filename,
+				Trigger:  "manual",
+				Content:  m.Content,
+			}
+		}
+		if err := s.macros.ReplaceForItem(ctx, item.ID, rev.RevisionNumber, dbMacros); err != nil {
+			s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: failed to index macros")
+		} else {
+			s.broker.Publish("macros.changed", mustMarshal(map[string]any{
+				"part_number": item.PartNumber,
+				"count":       len(dbMacros),
+			}))
+		}
+	}
+
+	s.logger.Info().Str("part_number", item.PartNumber).Msg("kc: metadata indexed successfully")
+}
+
+// strPtr returns a pointer to s, or nil if s is empty.
+func strPtr(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}
+
+// fieldKeys returns the keys from a map.
+func fieldKeys(m map[string]any) []string {
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	return keys
+}

internal/api/middleware.go

@@ -2,6 +2,8 @@
 package api
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"net/http"
 	"strings"
 	"time"
@@ -148,6 +150,55 @@ func (s *Server) RequireWritable(next http.Handler) http.Handler {
 	})
 }
 
+// RequireRunnerAuth extracts and validates a runner token from the
+// Authorization header. On success, injects RunnerIdentity into context
+// and updates the runner's heartbeat.
+func (s *Server) RequireRunnerAuth(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		token := extractBearerToken(r)
+		if token == "" || !strings.HasPrefix(token, "silo_runner_") {
+			writeError(w, http.StatusUnauthorized, "unauthorized", "Runner token required")
+			return
+		}
+
+		hash := sha256.Sum256([]byte(token))
+		tokenHash := hex.EncodeToString(hash[:])
+
+		runner, err := s.jobs.GetRunnerByToken(r.Context(), tokenHash)
+		if err != nil || runner == nil {
+			writeError(w, http.StatusUnauthorized, "unauthorized", "Invalid runner token")
+			return
+		}
+
+		// Update heartbeat on every authenticated request
+		_ = s.jobs.Heartbeat(r.Context(), runner.ID)
+
+		identity := &auth.RunnerIdentity{
+			ID:   runner.ID,
+			Name: runner.Name,
+			Tags: runner.Tags,
+		}
+		ctx := auth.ContextWithRunner(r.Context(), identity)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+// RequireModule returns middleware that rejects requests with 404 when
+// the named module is not enabled.
+func (s *Server) RequireModule(id string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if !s.modules.IsEnabled(id) {
+				w.Header().Set("Content-Type", "application/json")
+				w.WriteHeader(http.StatusNotFound)
+				w.Write([]byte(`{"error":"module '` + id + `' is not enabled"}`))
+				return
+			}
+			next.ServeHTTP(w, r)
+		})
+	}
+}
+
 func extractBearerToken(r *http.Request) string {
 	h := r.Header.Get("Authorization")
 	if strings.HasPrefix(h, "Bearer ") {

internal/api/pack_handlers.go

@@ -0,0 +1,182 @@
+package api
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"time"
+
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/kc"
+)
+
+// packKCFile gathers DB state and repacks silo/ entries in a .kc file.
+func (s *Server) packKCFile(ctx context.Context, data []byte, item *db.Item, rev *db.Revision, meta *db.ItemMetadata) ([]byte, error) {
+	manifest := &kc.Manifest{
+		UUID:         item.ID,
+		KCVersion:    derefStr(meta.KCVersion, "1.0"),
+		RevisionHash: derefStr(meta.RevisionHash, ""),
+		SiloInstance: derefStr(meta.SiloInstance, ""),
+	}
+
+	metadata := &kc.Metadata{
+		SchemaName:     derefStr(meta.SchemaName, ""),
+		Tags:           meta.Tags,
+		LifecycleState: meta.LifecycleState,
+		Fields:         meta.Fields,
+	}
+
+	// Build history from last 20 revisions.
+	revisions, err := s.items.GetRevisions(ctx, item.ID)
+	if err != nil {
+		return nil, fmt.Errorf("getting revisions: %w", err)
+	}
+	limit := 20
+	if len(revisions) < limit {
+		limit = len(revisions)
+	}
+	history := make([]kc.HistoryEntry, limit)
+	for i, r := range revisions[:limit] {
+		labels := r.Labels
+		if labels == nil {
+			labels = []string{}
+		}
+		history[i] = kc.HistoryEntry{
+			RevisionNumber: r.RevisionNumber,
+			CreatedAt:      r.CreatedAt.UTC().Format(time.RFC3339),
+			CreatedBy:      r.CreatedBy,
+			Comment:        r.Comment,
+			Status:         r.Status,
+			Labels:         labels,
+		}
+	}
+
+	// Build dependencies from item_dependencies table.
+	var deps []kc.Dependency
+	dbDeps, err := s.deps.ListByItem(ctx, item.ID)
+	if err != nil {
+		s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: failed to query dependencies for packing")
+	} else {
+		deps = make([]kc.Dependency, len(dbDeps))
+		for i, d := range dbDeps {
+			deps[i] = kc.Dependency{
+				UUID:         d.ChildUUID,
+				PartNumber:   derefStr(d.ChildPartNumber, ""),
+				Revision:     derefInt(d.ChildRevision, 0),
+				Quantity:     derefFloat(d.Quantity, 0),
+				Label:        derefStr(d.Label, ""),
+				Relationship: d.Relationship,
+			}
+		}
+	}
+	if deps == nil {
+		deps = []kc.Dependency{}
+	}
+
+	// Build approvals from item_approvals table.
+	var approvals []kc.ApprovalEntry
+	dbApprovals, err := s.approvals.ListByItemWithSignatures(ctx, item.ID)
+	if err != nil {
+		s.logger.Warn().Err(err).Str("part_number", item.PartNumber).Msg("kc: failed to query approvals for packing")
+	} else {
+		approvals = make([]kc.ApprovalEntry, len(dbApprovals))
+		for i, a := range dbApprovals {
+			sigs := make([]kc.SignatureEntry, len(a.Signatures))
+			for j, sig := range a.Signatures {
+				var signedAt string
+				if sig.SignedAt != nil {
+					signedAt = sig.SignedAt.UTC().Format("2006-01-02T15:04:05Z")
+				}
+				var comment string
+				if sig.Comment != nil {
+					comment = *sig.Comment
+				}
+				sigs[j] = kc.SignatureEntry{
+					Username: sig.Username,
+					Role:     sig.Role,
+					Status:   sig.Status,
+					SignedAt: signedAt,
+					Comment:  comment,
+				}
+			}
+			var ecoNumber string
+			if a.ECONumber != nil {
+				ecoNumber = *a.ECONumber
+			}
+			var updatedBy string
+			if a.UpdatedBy != nil {
+				updatedBy = *a.UpdatedBy
+			}
+			approvals[i] = kc.ApprovalEntry{
+				ID:           a.ID,
+				WorkflowName: a.WorkflowName,
+				ECONumber:    ecoNumber,
+				State:        a.State,
+				UpdatedAt:    a.UpdatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+				UpdatedBy:    updatedBy,
+				Signatures:   sigs,
+			}
+		}
+	}
+
+	input := &kc.PackInput{
+		Manifest:     manifest,
+		Metadata:     metadata,
+		History:      history,
+		Dependencies: deps,
+		Approvals:    approvals,
+	}
+
+	return kc.Pack(data, input)
+}
+
+// computeETag generates a quoted ETag from the revision number and metadata freshness.
+func computeETag(rev *db.Revision, meta *db.ItemMetadata) string {
+	var ts int64
+	if meta != nil {
+		ts = meta.UpdatedAt.UnixNano()
+	} else {
+		ts = rev.CreatedAt.UnixNano()
+	}
+	raw := fmt.Sprintf("%d:%d", rev.RevisionNumber, ts)
+	h := sha256.Sum256([]byte(raw))
+	return `"` + hex.EncodeToString(h[:8]) + `"`
+}
+
+// canSkipRepack returns true if the stored blob already has up-to-date silo/ data.
+func canSkipRepack(rev *db.Revision, meta *db.ItemMetadata) bool {
+	if meta == nil {
+		return true // no metadata row = plain .fcstd
+	}
+	if meta.RevisionHash != nil && rev.FileChecksum != nil &&
+		*meta.RevisionHash == *rev.FileChecksum &&
+		meta.UpdatedAt.Before(rev.CreatedAt) {
+		return true
+	}
+	return false
+}
+
+// derefStr returns the value of a *string pointer, or fallback if nil.
+func derefStr(p *string, fallback string) string {
+	if p != nil {
+		return *p
+	}
+	return fallback
+}
+
+// derefInt returns the value of a *int pointer, or fallback if nil.
+func derefInt(p *int, fallback int) int {
+	if p != nil {
+		return *p
+	}
+	return fallback
+}
+
+// derefFloat returns the value of a *float64 pointer, or fallback if nil.
+func derefFloat(p *float64, fallback float64) float64 {
+	if p != nil {
+		return *p
+	}
+	return fallback
+}

internal/api/routes.go

@@ -58,6 +58,7 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 	r.Get("/auth/callback", server.HandleOIDCCallback)
 
 	// Public API endpoints (no auth required)
+	r.Get("/api/modules", server.HandleGetModules)
 	r.Get("/api/auth/config", server.HandleAuthConfig)
 
 	// API routes (require auth, no CSRF — token auth instead)
@@ -67,6 +68,17 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 		// SSE event stream (viewer+)
 		r.Get("/events", server.HandleEvents)
 
+		// Workflows (viewer+)
+		r.Get("/workflows", server.HandleListWorkflows)
+
+		// Workstations (gated by sessions module)
+		r.Route("/workstations", func(r chi.Router) {
+			r.Use(server.RequireModule("sessions"))
+			r.Get("/", server.HandleListWorkstations)
+			r.Post("/", server.HandleRegisterWorkstation)
+			r.Delete("/{id}", server.HandleDeleteWorkstation)
+		})
+
 		// Auth endpoints
 		r.Get("/auth/me", server.HandleGetCurrentUser)
 		r.Route("/auth/tokens", func(r chi.Router) {
@@ -101,6 +113,7 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 
 		// Projects (read: viewer, write: editor)
 		r.Route("/projects", func(r chi.Router) {
+			r.Use(server.RequireModule("projects"))
 			r.Get("/", server.HandleListProjects)
 			r.Get("/{code}", server.HandleGetProject)
 			r.Get("/{code}/items", server.HandleGetProjectItems)
@@ -115,6 +128,26 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 			})
 		})
 
+		// Locations (read: viewer, write: editor)
+		r.Route("/locations", func(r chi.Router) {
+			r.Get("/", server.HandleListLocations)
+
+			r.Group(func(r chi.Router) {
+				r.Use(server.RequireWritable)
+				r.Use(server.RequireRole(auth.RoleEditor))
+				r.Post("/", server.HandleCreateLocation)
+			})
+
+			// Wildcard routes for path-based lookup (e.g., /api/locations/lab/shelf-a/bin-3)
+			r.Get("/*", server.HandleGetLocation)
+			r.Group(func(r chi.Router) {
+				r.Use(server.RequireWritable)
+				r.Use(server.RequireRole(auth.RoleEditor))
+				r.Put("/*", server.HandleUpdateLocation)
+				r.Delete("/*", server.HandleDeleteLocation)
+			})
+		})
+
 		// Items (read: viewer, write: editor)
 		r.Route("/items", func(r chi.Router) {
 			r.Get("/", server.HandleListItems)
@@ -140,6 +173,7 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 				r.Get("/revisions/compare", server.HandleCompareRevisions)
 				r.Get("/revisions/{revision}", server.HandleGetRevision)
 				r.Get("/files", server.HandleListItemFiles)
+				r.Get("/files/{fileId}/download", server.HandleDownloadItemFile)
 				r.Get("/file", server.HandleDownloadLatestFile)
 				r.Get("/file/{revision}", server.HandleDownloadFile)
 				r.Get("/bom", server.HandleGetBOM)
@@ -149,6 +183,28 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 				r.Get("/bom/where-used", server.HandleGetWhereUsed)
 				r.Get("/bom/export.csv", server.HandleExportBOMCSV)
 				r.Get("/bom/export.ods", server.HandleExportBOMODS)
+				r.Get("/metadata", server.HandleGetMetadata)
+				r.Get("/dependencies", server.HandleGetDependencies)
+				r.Get("/dependencies/resolve", server.HandleResolveDependencies)
+				r.Get("/macros", server.HandleGetMacros)
+				r.Get("/macros/{filename}", server.HandleGetMacro)
+				r.Get("/approvals", server.HandleGetApprovals)
+				r.Get("/solver/results", server.HandleGetSolverResults)
+
+				// DAG (gated by dag module)
+				r.Route("/dag", func(r chi.Router) {
+					r.Use(server.RequireModule("dag"))
+					r.Get("/", server.HandleGetDAG)
+					r.Get("/forward-cone/{nodeKey}", server.HandleGetForwardCone)
+					r.Get("/dirty", server.HandleGetDirtySubgraph)
+
+					r.Group(func(r chi.Router) {
+						r.Use(server.RequireWritable)
+						r.Use(server.RequireRole(auth.RoleEditor))
+						r.Put("/", server.HandleSyncDAG)
+						r.Post("/mark-dirty/{nodeKey}", server.HandleMarkDirty)
+					})
+				})
 
 				r.Group(func(r chi.Router) {
 					r.Use(server.RequireWritable)
@@ -162,25 +218,34 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 					r.Post("/revisions/{revision}/rollback", server.HandleRollbackRevision)
 					r.Post("/file", server.HandleUploadFile)
 					r.Post("/files", server.HandleAssociateItemFile)
+					r.Post("/files/upload", server.HandleUploadItemFile)
 					r.Delete("/files/{fileId}", server.HandleDeleteItemFile)
 					r.Put("/thumbnail", server.HandleSetItemThumbnail)
+					r.Post("/thumbnail/upload", server.HandleUploadItemThumbnail)
 					r.Post("/bom", server.HandleAddBOMEntry)
 					r.Post("/bom/import", server.HandleImportBOMCSV)
 					r.Post("/bom/merge", server.HandleMergeBOM)
 					r.Put("/bom/{childPartNumber}", server.HandleUpdateBOMEntry)
 					r.Delete("/bom/{childPartNumber}", server.HandleDeleteBOMEntry)
+					r.Put("/metadata", server.HandleUpdateMetadata)
+					r.Patch("/metadata/lifecycle", server.HandleUpdateLifecycle)
+					r.Patch("/metadata/tags", server.HandleUpdateTags)
+					r.Post("/approvals", server.HandleCreateApproval)
+					r.Post("/approvals/{id}/sign", server.HandleSignApproval)
 				})
 			})
 		})
 
 		// Audit (read-only, viewer role)
 		r.Route("/audit", func(r chi.Router) {
+			r.Use(server.RequireModule("audit"))
 			r.Get("/completeness", server.HandleAuditCompleteness)
 			r.Get("/completeness/{partNumber}", server.HandleAuditItemDetail)
 		})
 
 		// Integrations (read: viewer, write: editor)
 		r.Route("/integrations/odoo", func(r chi.Router) {
+			r.Use(server.RequireModule("odoo"))
 			r.Get("/config", server.HandleGetOdooConfig)
 			r.Get("/sync-log", server.HandleGetOdooSyncLog)
 
@@ -194,6 +259,21 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 			})
 		})
 
+		// Solver (gated by solver module)
+		r.Route("/solver", func(r chi.Router) {
+			r.Use(server.RequireModule("solver"))
+			r.Get("/solvers", server.HandleGetSolverRegistry)
+			r.Get("/jobs", server.HandleListSolverJobs)
+			r.Get("/jobs/{jobID}", server.HandleGetSolverJob)
+
+			r.Group(func(r chi.Router) {
+				r.Use(server.RequireWritable)
+				r.Use(server.RequireRole(auth.RoleEditor))
+				r.Post("/jobs", server.HandleSubmitSolverJob)
+				r.Post("/jobs/{jobID}/cancel", server.HandleCancelSolverJob)
+			})
+		})
+
 		// Sheets (editor)
 		r.Group(func(r chi.Router) {
 			r.Use(server.RequireWritable)
@@ -201,12 +281,71 @@ func NewRouter(server *Server, logger zerolog.Logger) http.Handler {
 			r.Post("/sheets/diff", server.HandleSheetDiff)
 		})
 
+		// Jobs (read: viewer, write: editor)
+		r.Route("/jobs", func(r chi.Router) {
+			r.Use(server.RequireModule("jobs"))
+			r.Get("/", server.HandleListJobs)
+			r.Get("/{jobID}", server.HandleGetJob)
+			r.Get("/{jobID}/logs", server.HandleGetJobLogs)
+
+			r.Group(func(r chi.Router) {
+				r.Use(server.RequireWritable)
+				r.Use(server.RequireRole(auth.RoleEditor))
+				r.Post("/", server.HandleCreateJob)
+				r.Post("/{jobID}/cancel", server.HandleCancelJob)
+			})
+		})
+
+		// Job definitions (read: viewer, reload: admin)
+		r.Route("/job-definitions", func(r chi.Router) {
+			r.Use(server.RequireModule("jobs"))
+			r.Get("/", server.HandleListJobDefinitions)
+			r.Get("/{name}", server.HandleGetJobDefinition)
+
+			r.Group(func(r chi.Router) {
+				r.Use(server.RequireRole(auth.RoleAdmin))
+				r.Post("/reload", server.HandleReloadJobDefinitions)
+			})
+		})
+
+		// Runners (admin)
+		r.Route("/runners", func(r chi.Router) {
+			r.Use(server.RequireModule("jobs"))
+			r.Use(server.RequireRole(auth.RoleAdmin))
+			r.Get("/", server.HandleListRunners)
+			r.Post("/", server.HandleRegisterRunner)
+			r.Delete("/{runnerID}", server.HandleDeleteRunner)
+		})
+
 		// Part number generation (editor)
 		r.Group(func(r chi.Router) {
 			r.Use(server.RequireWritable)
 			r.Use(server.RequireRole(auth.RoleEditor))
 			r.Post("/generate-part-number", server.HandleGeneratePartNumber)
 		})
+
+		// Admin settings (admin only)
+		r.Route("/admin/settings", func(r chi.Router) {
+			r.Use(server.RequireRole(auth.RoleAdmin))
+			r.Get("/", server.HandleGetAllSettings)
+			r.Get("/{module}", server.HandleGetModuleSettings)
+			r.Put("/{module}", server.HandleUpdateModuleSettings)
+			r.Post("/{module}/test", server.HandleTestModuleConnectivity)
+		})
+	})
+
+	// Runner-facing API (runner token auth, not user auth)
+	r.Route("/api/runner", func(r chi.Router) {
+		r.Use(server.RequireModule("jobs"))
+		r.Use(server.RequireRunnerAuth)
+		r.Post("/heartbeat", server.HandleRunnerHeartbeat)
+		r.Post("/claim", server.HandleRunnerClaim)
+		r.Post("/jobs/{jobID}/start", server.HandleRunnerStartJob)
+		r.Put("/jobs/{jobID}/progress", server.HandleRunnerUpdateProgress)
+		r.Post("/jobs/{jobID}/complete", server.HandleRunnerCompleteJob)
+		r.Post("/jobs/{jobID}/fail", server.HandleRunnerFailJob)
+		r.Post("/jobs/{jobID}/log", server.HandleRunnerAppendLog)
+		r.Put("/jobs/{jobID}/dag", server.HandleRunnerSyncDAG)
 	})
 
 	// React SPA — serve from web/dist at root, fallback to index.html

internal/api/runner_handlers.go

@@ -0,0 +1,388 @@
+package api
+
+import (
+	"context"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/jobdef"
+)
+
+// HandleRunnerHeartbeat updates the runner's heartbeat timestamp.
+func (s *Server) HandleRunnerHeartbeat(w http.ResponseWriter, r *http.Request) {
+	runner := auth.RunnerFromContext(r.Context())
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	// Heartbeat already updated by RequireRunnerAuth middleware
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
+// HandleRunnerClaim claims the next available job matching the runner's tags.
+func (s *Server) HandleRunnerClaim(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	job, err := s.jobs.ClaimJob(ctx, runner.ID, runner.Tags)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to claim job")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to claim job")
+		return
+	}
+	if job == nil {
+		writeJSON(w, http.StatusNoContent, nil)
+		return
+	}
+
+	// Look up the full definition to send to the runner
+	var defPayload map[string]any
+	if job.JobDefinitionID != nil {
+		rec, err := s.jobs.GetDefinitionByID(ctx, *job.JobDefinitionID)
+		if err == nil && rec != nil {
+			defPayload = rec.Definition
+		}
+	}
+
+	s.broker.Publish("job.claimed", mustMarshal(map[string]any{
+		"job_id":    job.ID,
+		"runner_id": runner.ID,
+		"runner":    runner.Name,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"job":        job,
+		"definition": defPayload,
+	})
+}
+
+// HandleRunnerStartJob transitions a claimed job to running.
+func (s *Server) HandleRunnerStartJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+	if err := s.jobs.StartJob(ctx, jobID, runner.ID); err != nil {
+		writeError(w, http.StatusBadRequest, "start_failed", err.Error())
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "running"})
+}
+
+// HandleRunnerUpdateProgress updates a running job's progress.
+func (s *Server) HandleRunnerUpdateProgress(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+	var req struct {
+		Progress int    `json:"progress"`
+		Message  string `json:"message,omitempty"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if err := s.jobs.UpdateProgress(ctx, jobID, runner.ID, req.Progress, req.Message); err != nil {
+		writeError(w, http.StatusBadRequest, "update_failed", err.Error())
+		return
+	}
+
+	s.broker.Publish("job.progress", mustMarshal(map[string]any{
+		"job_id":   jobID,
+		"progress": req.Progress,
+		"message":  req.Message,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
+// HandleRunnerCompleteJob marks a job as completed.
+func (s *Server) HandleRunnerCompleteJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+	var req struct {
+		Result map[string]any `json:"result,omitempty"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if err := s.jobs.CompleteJob(ctx, jobID, runner.ID, req.Result); err != nil {
+		writeError(w, http.StatusBadRequest, "complete_failed", err.Error())
+		return
+	}
+
+	// Cache solver results asynchronously (no-op for non-solver jobs).
+	go s.maybeCacheSolverResult(context.Background(), jobID)
+
+	s.broker.Publish("job.completed", mustMarshal(map[string]any{
+		"job_id":    jobID,
+		"runner_id": runner.ID,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "completed"})
+}
+
+// HandleRunnerFailJob marks a job as failed.
+func (s *Server) HandleRunnerFailJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+	var req struct {
+		Error string `json:"error"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if err := s.jobs.FailJob(ctx, jobID, runner.ID, req.Error); err != nil {
+		writeError(w, http.StatusBadRequest, "fail_failed", err.Error())
+		return
+	}
+
+	s.broker.Publish("job.failed", mustMarshal(map[string]any{
+		"job_id":    jobID,
+		"runner_id": runner.ID,
+		"error":     req.Error,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{"status": "failed"})
+}
+
+// HandleRunnerAppendLog appends a log entry to a job.
+func (s *Server) HandleRunnerAppendLog(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+	var req struct {
+		Level    string         `json:"level"`
+		Message  string         `json:"message"`
+		Metadata map[string]any `json:"metadata,omitempty"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if req.Level == "" {
+		req.Level = "info"
+	}
+
+	entry := &db.JobLogEntry{
+		JobID:    jobID,
+		Level:    req.Level,
+		Message:  req.Message,
+		Metadata: req.Metadata,
+	}
+	if err := s.jobs.AppendLog(ctx, entry); err != nil {
+		s.logger.Error().Err(err).Msg("failed to append job log")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to append log")
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, entry)
+}
+
+// HandleRunnerSyncDAG allows a runner to push DAG results for a job's item.
+func (s *Server) HandleRunnerSyncDAG(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	runner := auth.RunnerFromContext(ctx)
+	if runner == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Runner identity required")
+		return
+	}
+
+	jobID := chi.URLParam(r, "jobID")
+
+	// Get the job to find the item
+	job, err := s.jobs.GetJob(ctx, jobID)
+	if err != nil || job == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Job not found")
+		return
+	}
+	if job.ItemID == nil {
+		writeError(w, http.StatusBadRequest, "no_item", "Job has no associated item")
+		return
+	}
+
+	// Delegate to the DAG sync handler logic
+	var req dagSyncRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	if req.RevisionNumber == 0 {
+		// Look up current revision
+		item, err := s.items.GetByID(ctx, *job.ItemID)
+		if err != nil || item == nil {
+			writeError(w, http.StatusNotFound, "not_found", "Item not found")
+			return
+		}
+		req.RevisionNumber = item.CurrentRevision
+	}
+
+	// Convert and sync nodes
+	nodes := make([]db.DAGNode, len(req.Nodes))
+	for i, n := range req.Nodes {
+		state := n.ValidationState
+		if state == "" {
+			state = "clean"
+		}
+		nodes[i] = db.DAGNode{
+			NodeKey:         n.NodeKey,
+			NodeType:        n.NodeType,
+			PropertiesHash:  n.PropertiesHash,
+			ValidationState: state,
+			Metadata:        n.Metadata,
+		}
+	}
+
+	if err := s.dag.SyncFeatureTree(ctx, *job.ItemID, req.RevisionNumber, nodes, nil); err != nil {
+		s.logger.Error().Err(err).Msg("failed to sync DAG from runner")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to sync DAG")
+		return
+	}
+
+	// Build key→ID map and sync edges
+	keyToID := make(map[string]string, len(nodes))
+	for _, n := range nodes {
+		keyToID[n.NodeKey] = n.ID
+	}
+
+	if len(req.Edges) > 0 {
+		if err := s.dag.DeleteEdgesForItem(ctx, *job.ItemID, req.RevisionNumber); err != nil {
+			s.logger.Error().Err(err).Msg("failed to delete old edges")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to sync DAG edges")
+			return
+		}
+		for _, e := range req.Edges {
+			sourceID, ok := keyToID[e.SourceKey]
+			if !ok {
+				continue
+			}
+			targetID, ok := keyToID[e.TargetKey]
+			if !ok {
+				continue
+			}
+			edgeType := e.EdgeType
+			if edgeType == "" {
+				edgeType = "depends_on"
+			}
+			edge := &db.DAGEdge{
+				SourceNodeID: sourceID,
+				TargetNodeID: targetID,
+				EdgeType:     edgeType,
+				Metadata:     e.Metadata,
+			}
+			if err := s.dag.CreateEdge(ctx, edge); err != nil {
+				s.logger.Error().Err(err).Msg("failed to create edge from runner")
+			}
+		}
+	}
+
+	s.broker.Publish("dag.updated", mustMarshal(map[string]any{
+		"item_id":    *job.ItemID,
+		"job_id":     jobID,
+		"runner":     runner.Name,
+		"node_count": len(req.Nodes),
+		"edge_count": len(req.Edges),
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"synced":     true,
+		"node_count": len(req.Nodes),
+		"edge_count": len(req.Edges),
+	})
+}
+
+// generateRunnerToken creates a new runner token. Returns raw token, hash, and prefix.
+func generateRunnerToken() (raw, hash, prefix string) {
+	rawBytes := make([]byte, 32)
+	if _, err := rand.Read(rawBytes); err != nil {
+		panic(fmt.Sprintf("generating random bytes: %v", err))
+	}
+
+	raw = "silo_runner_" + hex.EncodeToString(rawBytes)
+
+	h := sha256.Sum256([]byte(raw))
+	hash = hex.EncodeToString(h[:])
+
+	prefix = raw[:20] // "silo_runner_" + first 8 hex chars
+
+	return
+}
+
+// loadAndUpsertJobDefs loads YAML definitions from a directory and upserts them into the database.
+func loadAndUpsertJobDefs(ctx context.Context, dir string, repo *db.JobRepository) (map[string]*jobdef.Definition, error) {
+	defs, err := jobdef.LoadAll(dir)
+	if err != nil {
+		return nil, fmt.Errorf("loading job definitions: %w", err)
+	}
+
+	for _, def := range defs {
+		defJSON, _ := json.Marshal(def)
+		var defMap map[string]any
+		json.Unmarshal(defJSON, &defMap)
+
+		rec := &db.JobDefinitionRecord{
+			Name:           def.Name,
+			Version:        def.Version,
+			TriggerType:    def.Trigger.Type,
+			ScopeType:      def.Scope.Type,
+			ComputeType:    def.Compute.Type,
+			RunnerTags:     def.Runner.Tags,
+			TimeoutSeconds: def.Timeout,
+			MaxRetries:     def.MaxRetries,
+			Priority:       def.Priority,
+			Definition:     defMap,
+			Enabled:        true,
+		}
+		if err := repo.UpsertDefinition(ctx, rec); err != nil {
+			return nil, fmt.Errorf("upserting definition %s: %w", def.Name, err)
+		}
+	}
+
+	return defs, nil
+}

internal/api/servermode.go

@@ -26,13 +26,13 @@ type ServerState struct {
 	mu        sync.RWMutex
 	readOnly  bool
 	storageOK bool
-	storage   *storage.Storage
+	storage   storage.FileStore
 	broker    *Broker
 	done      chan struct{}
 }
 
 // NewServerState creates a new server state tracker.
-func NewServerState(logger zerolog.Logger, store *storage.Storage, broker *Broker) *ServerState {
+func NewServerState(logger zerolog.Logger, store storage.FileStore, broker *Broker) *ServerState {
 	return &ServerState{
 		logger:    logger.With().Str("component", "server-state").Logger(),
 		storageOK: store != nil, // assume healthy if configured
@@ -86,7 +86,7 @@ func (ss *ServerState) ToggleReadOnly() {
 	ss.SetReadOnly(!current)
 }
 
-// StartStorageHealthCheck launches a periodic check of MinIO reachability.
+// StartStorageHealthCheck launches a periodic check of storage reachability.
 // Updates storageOK and broadcasts server.state on transitions.
 func (ss *ServerState) StartStorageHealthCheck() {
 	if ss.storage == nil {

internal/api/servermode_test.go

@@ -76,7 +76,7 @@ func TestServerStateToggleReadOnly(t *testing.T) {
 
 func TestServerStateBroadcastsOnTransition(t *testing.T) {
 	b := NewBroker(zerolog.Nop())
-	c := b.Subscribe()
+	c := b.Subscribe("", "")
 	defer b.Unsubscribe(c)
 
 	ss := NewServerState(zerolog.Nop(), nil, b)

internal/api/settings_handlers.go

@@ -0,0 +1,314 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+)
+
+// HandleGetAllSettings returns the full config grouped by module with secrets redacted.
+func (s *Server) HandleGetAllSettings(w http.ResponseWriter, r *http.Request) {
+	resp := map[string]any{
+		"core":     s.buildCoreSettings(),
+		"schemas":  s.buildSchemasSettings(),
+		"storage":  s.buildStorageSettings(r.Context()),
+		"database": s.buildDatabaseSettings(r.Context()),
+		"auth":     s.buildAuthSettings(),
+		"projects": map[string]any{"enabled": s.modules.IsEnabled("projects")},
+		"audit":    map[string]any{"enabled": s.modules.IsEnabled("audit")},
+		"odoo":     s.buildOdooSettings(),
+		"freecad":  s.buildFreecadSettings(),
+		"jobs":     s.buildJobsSettings(),
+		"dag":      map[string]any{"enabled": s.modules.IsEnabled("dag")},
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// HandleGetModuleSettings returns settings for a single module.
+func (s *Server) HandleGetModuleSettings(w http.ResponseWriter, r *http.Request) {
+	module := chi.URLParam(r, "module")
+
+	var settings any
+	switch module {
+	case "core":
+		settings = s.buildCoreSettings()
+	case "schemas":
+		settings = s.buildSchemasSettings()
+	case "storage":
+		settings = s.buildStorageSettings(r.Context())
+	case "database":
+		settings = s.buildDatabaseSettings(r.Context())
+	case "auth":
+		settings = s.buildAuthSettings()
+	case "projects":
+		settings = map[string]any{"enabled": s.modules.IsEnabled("projects")}
+	case "audit":
+		settings = map[string]any{"enabled": s.modules.IsEnabled("audit")}
+	case "odoo":
+		settings = s.buildOdooSettings()
+	case "freecad":
+		settings = s.buildFreecadSettings()
+	case "jobs":
+		settings = s.buildJobsSettings()
+	case "dag":
+		settings = map[string]any{"enabled": s.modules.IsEnabled("dag")}
+	default:
+		writeError(w, http.StatusNotFound, "not_found", "Unknown module: "+module)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, settings)
+}
+
+// HandleUpdateModuleSettings handles module toggle and config overrides.
+func (s *Server) HandleUpdateModuleSettings(w http.ResponseWriter, r *http.Request) {
+	module := chi.URLParam(r, "module")
+
+	// Validate module exists
+	if s.modules.Get(module) == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Unknown module: "+module)
+		return
+	}
+
+	var body map[string]any
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_json", err.Error())
+		return
+	}
+
+	user := auth.UserFromContext(r.Context())
+	username := "system"
+	if user != nil {
+		username = user.Username
+	}
+
+	var updated []string
+	restartRequired := false
+
+	// Handle module toggle
+	if enabledVal, ok := body["enabled"]; ok {
+		enabled, ok := enabledVal.(bool)
+		if !ok {
+			writeError(w, http.StatusBadRequest, "invalid_value", "'enabled' must be a boolean")
+			return
+		}
+
+		if err := s.modules.SetEnabled(module, enabled); err != nil {
+			writeError(w, http.StatusBadRequest, "toggle_failed", err.Error())
+			return
+		}
+
+		if err := s.settings.SetModuleState(r.Context(), module, enabled, username); err != nil {
+			s.logger.Error().Err(err).Str("module", module).Msg("failed to persist module state")
+			writeError(w, http.StatusInternalServerError, "persist_failed", "Failed to save module state")
+			return
+		}
+
+		updated = append(updated, module+".enabled")
+	}
+
+	// Handle config overrides (future use — persisted but not hot-reloaded)
+	for key, value := range body {
+		if key == "enabled" {
+			continue
+		}
+
+		fullKey := module + "." + key
+		if err := s.settings.SetOverride(r.Context(), fullKey, value, username); err != nil {
+			s.logger.Error().Err(err).Str("key", fullKey).Msg("failed to persist setting override")
+			writeError(w, http.StatusInternalServerError, "persist_failed", "Failed to save setting: "+key)
+			return
+		}
+		updated = append(updated, fullKey)
+
+		// These namespaces require a restart to take effect
+		if strings.HasPrefix(fullKey, "database.") ||
+			strings.HasPrefix(fullKey, "storage.") ||
+			strings.HasPrefix(fullKey, "server.") ||
+			strings.HasPrefix(fullKey, "schemas.") {
+			restartRequired = true
+		}
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"updated":          updated,
+		"restart_required": restartRequired,
+	})
+
+	// Publish SSE event
+	s.broker.Publish("settings.changed", mustMarshal(map[string]any{
+		"module":       module,
+		"changed_keys": updated,
+		"updated_by":   username,
+	}))
+}
+
+// HandleTestModuleConnectivity tests external connectivity for a module.
+func (s *Server) HandleTestModuleConnectivity(w http.ResponseWriter, r *http.Request) {
+	module := chi.URLParam(r, "module")
+
+	start := time.Now()
+	var success bool
+	var message string
+
+	switch module {
+	case "database":
+		if err := s.db.Pool().Ping(r.Context()); err != nil {
+			success = false
+			message = "Database ping failed: " + err.Error()
+		} else {
+			success = true
+			message = "Database connection OK"
+		}
+	case "storage":
+		if s.storage == nil {
+			success = false
+			message = "Storage not configured"
+		} else if err := s.storage.Ping(r.Context()); err != nil {
+			success = false
+			message = "Storage ping failed: " + err.Error()
+		} else {
+			success = true
+			message = "Storage connection OK"
+		}
+	case "auth", "odoo":
+		success = false
+		message = "Connectivity test not implemented for " + module
+	default:
+		writeError(w, http.StatusBadRequest, "not_testable", "No connectivity test available for module: "+module)
+		return
+	}
+
+	latency := time.Since(start).Milliseconds()
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"success":    success,
+		"message":    message,
+		"latency_ms": latency,
+	})
+}
+
+// --- build helpers (read config, redact secrets) ---
+
+func redact(s string) string {
+	if s == "" {
+		return ""
+	}
+	return "****"
+}
+
+func (s *Server) buildCoreSettings() map[string]any {
+	return map[string]any{
+		"enabled":  true,
+		"host":     s.cfg.Server.Host,
+		"port":     s.cfg.Server.Port,
+		"base_url": s.cfg.Server.BaseURL,
+		"readonly": s.cfg.Server.ReadOnly,
+	}
+}
+
+func (s *Server) buildSchemasSettings() map[string]any {
+	return map[string]any{
+		"enabled":   true,
+		"directory": s.cfg.Schemas.Directory,
+		"default":   s.cfg.Schemas.Default,
+		"count":     len(s.schemas),
+	}
+}
+
+func (s *Server) buildStorageSettings(ctx context.Context) map[string]any {
+	result := map[string]any{
+		"enabled":  true,
+		"backend":  "filesystem",
+		"root_dir": s.cfg.Storage.Filesystem.RootDir,
+	}
+	if s.storage != nil {
+		if err := s.storage.Ping(ctx); err != nil {
+			result["status"] = "unavailable"
+		} else {
+			result["status"] = "ok"
+		}
+	} else {
+		result["status"] = "not_configured"
+	}
+	return result
+}
+
+func (s *Server) buildDatabaseSettings(ctx context.Context) map[string]any {
+	result := map[string]any{
+		"enabled":         true,
+		"host":            s.cfg.Database.Host,
+		"port":            s.cfg.Database.Port,
+		"name":            s.cfg.Database.Name,
+		"user":            s.cfg.Database.User,
+		"password":        redact(s.cfg.Database.Password),
+		"sslmode":         s.cfg.Database.SSLMode,
+		"max_connections": s.cfg.Database.MaxConnections,
+	}
+	if err := s.db.Pool().Ping(ctx); err != nil {
+		result["status"] = "unavailable"
+	} else {
+		result["status"] = "ok"
+	}
+	return result
+}
+
+func (s *Server) buildAuthSettings() map[string]any {
+	return map[string]any{
+		"enabled":        s.modules.IsEnabled("auth"),
+		"session_secret": redact(s.cfg.Auth.SessionSecret),
+		"local": map[string]any{
+			"enabled":                s.cfg.Auth.Local.Enabled,
+			"default_admin_username": s.cfg.Auth.Local.DefaultAdminUsername,
+			"default_admin_password": redact(s.cfg.Auth.Local.DefaultAdminPassword),
+		},
+		"ldap": map[string]any{
+			"enabled":       s.cfg.Auth.LDAP.Enabled,
+			"url":           s.cfg.Auth.LDAP.URL,
+			"base_dn":       s.cfg.Auth.LDAP.BaseDN,
+			"bind_dn":       s.cfg.Auth.LDAP.BindDN,
+			"bind_password": redact(s.cfg.Auth.LDAP.BindPassword),
+		},
+		"oidc": map[string]any{
+			"enabled":       s.cfg.Auth.OIDC.Enabled,
+			"issuer_url":    s.cfg.Auth.OIDC.IssuerURL,
+			"client_id":     s.cfg.Auth.OIDC.ClientID,
+			"client_secret": redact(s.cfg.Auth.OIDC.ClientSecret),
+			"redirect_url":  s.cfg.Auth.OIDC.RedirectURL,
+		},
+	}
+}
+
+func (s *Server) buildOdooSettings() map[string]any {
+	return map[string]any{
+		"enabled":  s.modules.IsEnabled("odoo"),
+		"url":      s.cfg.Odoo.URL,
+		"database": s.cfg.Odoo.Database,
+		"username": s.cfg.Odoo.Username,
+		"api_key":  redact(s.cfg.Odoo.APIKey),
+	}
+}
+
+func (s *Server) buildFreecadSettings() map[string]any {
+	return map[string]any{
+		"enabled":    s.modules.IsEnabled("freecad"),
+		"uri_scheme": s.cfg.FreeCAD.URIScheme,
+		"executable": s.cfg.FreeCAD.Executable,
+	}
+}
+
+func (s *Server) buildJobsSettings() map[string]any {
+	return map[string]any{
+		"enabled":           s.modules.IsEnabled("jobs"),
+		"directory":         s.cfg.Jobs.Directory,
+		"runner_timeout":    s.cfg.Jobs.RunnerTimeout,
+		"job_timeout_check": s.cfg.Jobs.JobTimeoutCheck,
+		"default_priority":  s.cfg.Jobs.DefaultPriority,
+		"definitions_count": len(s.jobDefs),
+	}
+}

internal/api/settings_handlers_test.go

@@ -0,0 +1,286 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/config"
+	"github.com/kindredsystems/silo/internal/db"
+	"github.com/kindredsystems/silo/internal/modules"
+	"github.com/kindredsystems/silo/internal/schema"
+	"github.com/kindredsystems/silo/internal/testutil"
+	"github.com/rs/zerolog"
+)
+
+func newSettingsTestServer(t *testing.T) *Server {
+	t.Helper()
+	pool := testutil.MustConnectTestPool(t)
+	database := db.NewFromPool(pool)
+	broker := NewBroker(zerolog.Nop())
+	state := NewServerState(zerolog.Nop(), nil, broker)
+	cfg := &config.Config{
+		Server: config.ServerConfig{Host: "0.0.0.0", Port: 8080},
+		Database: config.DatabaseConfig{
+			Host: "localhost", Port: 5432, Name: "silo_test",
+			User: "silo", Password: "secret", SSLMode: "disable",
+			MaxConnections: 10,
+		},
+		Storage: config.StorageConfig{
+			Backend:    "filesystem",
+			Filesystem: config.FilesystemConfig{RootDir: "/tmp/silo-test"},
+		},
+		Schemas: config.SchemasConfig{Directory: "/etc/silo/schemas", Default: "kindred-rd"},
+		Auth: config.AuthConfig{
+			SessionSecret: "supersecret",
+			Local:         config.LocalAuth{Enabled: true, DefaultAdminUsername: "admin", DefaultAdminPassword: "changeme"},
+			LDAP:          config.LDAPAuth{Enabled: false, BindPassword: "ldapsecret"},
+			OIDC:          config.OIDCAuth{Enabled: false, ClientSecret: "oidcsecret"},
+		},
+		FreeCAD: config.FreeCADConfig{URIScheme: "silo"},
+		Odoo:    config.OdooConfig{URL: "https://odoo.example.com", APIKey: "odoo-api-key"},
+		Jobs:    config.JobsConfig{Directory: "/etc/silo/jobdefs", RunnerTimeout: 90, JobTimeoutCheck: 30, DefaultPriority: 100},
+	}
+	return NewServer(
+		zerolog.Nop(),
+		database,
+		map[string]*schema.Schema{"test": {Name: "test"}},
+		cfg.Schemas.Directory,
+		nil, // storage
+		nil, // authService
+		nil, // sessionManager
+		nil, // oidcBackend
+		nil, // authConfig
+		broker,
+		state,
+		nil,                   // jobDefs
+		"",                    // jobDefsDir
+		modules.NewRegistry(), // modules
+		cfg,
+		nil, // workflows
+	)
+}
+
+func newSettingsRouter(s *Server) http.Handler {
+	r := chi.NewRouter()
+	r.Route("/api/admin/settings", func(r chi.Router) {
+		r.Get("/", s.HandleGetAllSettings)
+		r.Get("/{module}", s.HandleGetModuleSettings)
+		r.Put("/{module}", s.HandleUpdateModuleSettings)
+		r.Post("/{module}/test", s.HandleTestModuleConnectivity)
+	})
+	return r
+}
+
+func adminSettingsRequest(r *http.Request) *http.Request {
+	u := &auth.User{
+		ID:       "admin-id",
+		Username: "testadmin",
+		Role:     auth.RoleAdmin,
+	}
+	return r.WithContext(auth.ContextWithUser(r.Context(), u))
+}
+
+func viewerSettingsRequest(r *http.Request) *http.Request {
+	u := &auth.User{
+		ID:       "viewer-id",
+		Username: "testviewer",
+		Role:     auth.RoleViewer,
+	}
+	return r.WithContext(auth.ContextWithUser(r.Context(), u))
+}
+
+func TestGetAllSettings(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	req := adminSettingsRequest(httptest.NewRequest("GET", "/api/admin/settings", nil))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var resp map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("decoding: %v", err)
+	}
+
+	// Verify all module keys present
+	expectedModules := []string{"core", "schemas", "storage", "database", "auth", "projects", "audit", "odoo", "freecad", "jobs", "dag"}
+	for _, mod := range expectedModules {
+		if _, ok := resp[mod]; !ok {
+			t.Errorf("missing module key: %s", mod)
+		}
+	}
+
+	// Verify secrets are redacted
+	dbSettings, _ := resp["database"].(map[string]any)
+	if dbSettings["password"] != "****" {
+		t.Errorf("database password not redacted: got %v", dbSettings["password"])
+	}
+
+	authSettings, _ := resp["auth"].(map[string]any)
+	if authSettings["session_secret"] != "****" {
+		t.Errorf("session_secret not redacted: got %v", authSettings["session_secret"])
+	}
+
+	ldap, _ := authSettings["ldap"].(map[string]any)
+	if ldap["bind_password"] != "****" {
+		t.Errorf("ldap bind_password not redacted: got %v", ldap["bind_password"])
+	}
+
+	oidc, _ := authSettings["oidc"].(map[string]any)
+	if oidc["client_secret"] != "****" {
+		t.Errorf("oidc client_secret not redacted: got %v", oidc["client_secret"])
+	}
+
+	odoo, _ := resp["odoo"].(map[string]any)
+	if odoo["api_key"] != "****" {
+		t.Errorf("odoo api_key not redacted: got %v", odoo["api_key"])
+	}
+}
+
+func TestGetModuleSettings(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	req := adminSettingsRequest(httptest.NewRequest("GET", "/api/admin/settings/jobs", nil))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var resp map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("decoding: %v", err)
+	}
+
+	if resp["directory"] != "/etc/silo/jobdefs" {
+		t.Errorf("jobs directory: got %v, want /etc/silo/jobdefs", resp["directory"])
+	}
+	if resp["runner_timeout"] != float64(90) {
+		t.Errorf("runner_timeout: got %v, want 90", resp["runner_timeout"])
+	}
+}
+
+func TestGetModuleSettings_Unknown(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	req := adminSettingsRequest(httptest.NewRequest("GET", "/api/admin/settings/nonexistent", nil))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("status: got %d, want %d", w.Code, http.StatusNotFound)
+	}
+}
+
+func TestToggleModule(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	// Projects is enabled by default; disable it
+	body := `{"enabled": false}`
+	req := adminSettingsRequest(httptest.NewRequest("PUT", "/api/admin/settings/projects", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var resp map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("decoding: %v", err)
+	}
+
+	updated, _ := resp["updated"].([]any)
+	if len(updated) != 1 || updated[0] != "projects.enabled" {
+		t.Errorf("updated: got %v, want [projects.enabled]", updated)
+	}
+
+	// Verify registry state
+	if s.modules.IsEnabled("projects") {
+		t.Error("projects should be disabled after toggle")
+	}
+}
+
+func TestToggleModule_DependencyError(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	// DAG depends on Jobs. Jobs is disabled by default.
+	// Enabling DAG without Jobs should fail.
+	body := `{"enabled": true}`
+	req := adminSettingsRequest(httptest.NewRequest("PUT", "/api/admin/settings/dag", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status: got %d, want %d; body: %s", w.Code, http.StatusBadRequest, w.Body.String())
+	}
+}
+
+func TestToggleRequiredModule(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	body := `{"enabled": false}`
+	req := adminSettingsRequest(httptest.NewRequest("PUT", "/api/admin/settings/core", strings.NewReader(body)))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status: got %d, want %d; body: %s", w.Code, http.StatusBadRequest, w.Body.String())
+	}
+}
+
+func TestTestConnectivity_Database(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	req := adminSettingsRequest(httptest.NewRequest("POST", "/api/admin/settings/database/test", nil))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var resp map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("decoding: %v", err)
+	}
+
+	if resp["success"] != true {
+		t.Errorf("expected success=true, got %v; message: %v", resp["success"], resp["message"])
+	}
+	if resp["latency_ms"] == nil {
+		t.Error("expected latency_ms in response")
+	}
+}
+
+func TestTestConnectivity_NotTestable(t *testing.T) {
+	s := newSettingsTestServer(t)
+	router := newSettingsRouter(s)
+
+	req := adminSettingsRequest(httptest.NewRequest("POST", "/api/admin/settings/core/test", nil))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status: got %d, want %d; body: %s", w.Code, http.StatusBadRequest, w.Body.String())
+	}
+}

internal/api/solver_handlers.go

@@ -0,0 +1,551 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+)
+
+// SubmitSolveRequest is the JSON body for POST /api/solver/jobs.
+type SubmitSolveRequest struct {
+	Solver         string          `json:"solver"`
+	Operation      string          `json:"operation"`
+	Context        json.RawMessage `json:"context"`
+	Priority       *int            `json:"priority,omitempty"`
+	ItemPartNumber string          `json:"item_part_number,omitempty"`
+	RevisionNumber *int            `json:"revision_number,omitempty"`
+}
+
+// SolverJobResponse is the JSON response for solver job creation.
+type SolverJobResponse struct {
+	JobID     string `json:"job_id"`
+	Status    string `json:"status"`
+	CreatedAt string `json:"created_at"`
+}
+
+// SolverResultResponse is the JSON response for cached solver results.
+type SolverResultResponse struct {
+	ID             string          `json:"id"`
+	RevisionNumber int             `json:"revision_number"`
+	JobID          *string         `json:"job_id,omitempty"`
+	Operation      string          `json:"operation"`
+	SolverName     string          `json:"solver_name"`
+	Status         string          `json:"status"`
+	DOF            *int            `json:"dof,omitempty"`
+	Diagnostics    json.RawMessage `json:"diagnostics"`
+	Placements     json.RawMessage `json:"placements"`
+	NumFrames      int             `json:"num_frames"`
+	SolveTimeMS    *float64        `json:"solve_time_ms,omitempty"`
+	CreatedAt      string          `json:"created_at"`
+}
+
+// operationToDefinition maps solve operations to job definition names.
+var operationToDefinition = map[string]string{
+	"solve":     "assembly-solve",
+	"diagnose":  "assembly-validate",
+	"kinematic": "assembly-kinematic",
+}
+
+// HandleSubmitSolverJob creates a solver job via the existing job queue.
+// POST /api/solver/jobs
+func (s *Server) HandleSubmitSolverJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	// Enforce max context size at the HTTP boundary.
+	maxBytes := int64(s.cfg.Solver.MaxContextSizeMB) * 1024 * 1024
+	r.Body = http.MaxBytesReader(w, r.Body, maxBytes)
+
+	var req SubmitSolveRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		if err.Error() == "http: request body too large" {
+			writeError(w, http.StatusRequestEntityTooLarge, "context_too_large",
+				"SolveContext exceeds maximum size")
+			return
+		}
+		writeError(w, http.StatusBadRequest, "invalid_body", "Invalid JSON body")
+		return
+	}
+
+	// Validate operation.
+	if req.Operation == "" {
+		req.Operation = "solve"
+	}
+	defName, ok := operationToDefinition[req.Operation]
+	if !ok {
+		writeError(w, http.StatusBadRequest, "invalid_operation",
+			"Operation must be 'solve', 'diagnose', or 'kinematic'")
+		return
+	}
+
+	// Context is required.
+	if len(req.Context) == 0 {
+		writeError(w, http.StatusBadRequest, "missing_context", "SolveContext is required")
+		return
+	}
+
+	// Look up job definition.
+	def, err := s.jobs.GetDefinition(ctx, defName)
+	if err != nil {
+		s.logger.Error().Err(err).Str("definition", defName).Msg("failed to look up solver job definition")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to look up job definition")
+		return
+	}
+	if def == nil {
+		writeError(w, http.StatusNotFound, "definition_not_found",
+			"Solver job definition '"+defName+"' not found; ensure job definition YAML is loaded")
+		return
+	}
+
+	// Resolve item_part_number → item_id (optional).
+	var itemID *string
+	if req.ItemPartNumber != "" {
+		item, err := s.items.GetByPartNumber(ctx, req.ItemPartNumber)
+		if err != nil {
+			s.logger.Error().Err(err).Msg("failed to get item for solver job")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to resolve item")
+			return
+		}
+		if item == nil {
+			writeError(w, http.StatusNotFound, "item_not_found",
+				"Item '"+req.ItemPartNumber+"' not found")
+			return
+		}
+		itemID = &item.ID
+	}
+
+	// Pack solver-specific data into scope_metadata.
+	scopeMeta := map[string]any{
+		"solver":    req.Solver,
+		"operation": req.Operation,
+		"context":   req.Context,
+	}
+	if req.RevisionNumber != nil {
+		scopeMeta["revision_number"] = *req.RevisionNumber
+	}
+	if req.ItemPartNumber != "" {
+		scopeMeta["item_part_number"] = req.ItemPartNumber
+	}
+
+	priority := def.Priority
+	if req.Priority != nil {
+		priority = *req.Priority
+	}
+
+	username := ""
+	if user := auth.UserFromContext(ctx); user != nil {
+		username = user.Username
+	}
+
+	job := &db.Job{
+		JobDefinitionID: &def.ID,
+		DefinitionName:  def.Name,
+		Priority:        priority,
+		ItemID:          itemID,
+		ScopeMetadata:   scopeMeta,
+		RunnerTags:      def.RunnerTags,
+		TimeoutSeconds:  def.TimeoutSeconds,
+		MaxRetries:      def.MaxRetries,
+		CreatedBy:       &username,
+	}
+
+	// Use solver default timeout if the definition has none.
+	if job.TimeoutSeconds == 0 {
+		job.TimeoutSeconds = s.cfg.Solver.DefaultTimeout
+	}
+
+	if err := s.jobs.CreateJob(ctx, job); err != nil {
+		s.logger.Error().Err(err).Msg("failed to create solver job")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to create solver job")
+		return
+	}
+
+	s.broker.Publish("job.created", mustMarshal(map[string]any{
+		"job_id":          job.ID,
+		"definition_name": job.DefinitionName,
+		"trigger":         "manual",
+		"item_id":         job.ItemID,
+	}))
+
+	writeJSON(w, http.StatusCreated, SolverJobResponse{
+		JobID:     job.ID,
+		Status:    job.Status,
+		CreatedAt: job.CreatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+	})
+}
+
+// HandleGetSolverJob returns a single solver job.
+// GET /api/solver/jobs/{jobID}
+func (s *Server) HandleGetSolverJob(w http.ResponseWriter, r *http.Request) {
+	jobID := chi.URLParam(r, "jobID")
+
+	job, err := s.jobs.GetJob(r.Context(), jobID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get solver job")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get job")
+		return
+	}
+	if job == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Job not found")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, job)
+}
+
+// HandleListSolverJobs lists solver jobs with optional filters.
+// GET /api/solver/jobs
+func (s *Server) HandleListSolverJobs(w http.ResponseWriter, r *http.Request) {
+	status := r.URL.Query().Get("status")
+	itemPartNumber := r.URL.Query().Get("item")
+	operation := r.URL.Query().Get("operation")
+
+	limit := 20
+	if v := r.URL.Query().Get("limit"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 && n <= 100 {
+			limit = n
+		}
+	}
+	offset := 0
+	if v := r.URL.Query().Get("offset"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n >= 0 {
+			offset = n
+		}
+	}
+
+	// Resolve item part number to ID if provided.
+	var itemID string
+	if itemPartNumber != "" {
+		item, err := s.items.GetByPartNumber(r.Context(), itemPartNumber)
+		if err != nil {
+			s.logger.Error().Err(err).Msg("failed to resolve item for solver job list")
+			writeError(w, http.StatusInternalServerError, "internal_error", "Failed to resolve item")
+			return
+		}
+		if item == nil {
+			writeJSON(w, http.StatusOK, map[string]any{
+				"jobs":   []*db.Job{},
+				"total":  0,
+				"limit":  limit,
+				"offset": offset,
+			})
+			return
+		}
+		itemID = item.ID
+	}
+
+	jobs, err := s.jobs.ListSolverJobs(r.Context(), status, itemID, operation, limit, offset)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list solver jobs")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list solver jobs")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"jobs":   jobs,
+		"limit":  limit,
+		"offset": offset,
+	})
+}
+
+// HandleCancelSolverJob cancels a solver job.
+// POST /api/solver/jobs/{jobID}/cancel
+func (s *Server) HandleCancelSolverJob(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	jobID := chi.URLParam(r, "jobID")
+	user := auth.UserFromContext(ctx)
+
+	cancelledBy := "system"
+	if user != nil {
+		cancelledBy = user.Username
+	}
+
+	if err := s.jobs.CancelJob(ctx, jobID, cancelledBy); err != nil {
+		writeError(w, http.StatusBadRequest, "cancel_failed", err.Error())
+		return
+	}
+
+	s.broker.Publish("job.cancelled", mustMarshal(map[string]any{
+		"job_id":       jobID,
+		"cancelled_by": cancelledBy,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]string{
+		"job_id": jobID,
+		"status": "cancelled",
+	})
+}
+
+// HandleGetSolverRegistry returns available solvers from online runners.
+// GET /api/solver/solvers
+func (s *Server) HandleGetSolverRegistry(w http.ResponseWriter, r *http.Request) {
+	runners, err := s.jobs.ListRunners(r.Context())
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list runners for solver registry")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list runners")
+		return
+	}
+
+	type solverInfo struct {
+		Name            string   `json:"name"`
+		DisplayName     string   `json:"display_name,omitempty"`
+		Deterministic   bool     `json:"deterministic,omitempty"`
+		SupportedJoints []string `json:"supported_joints,omitempty"`
+		RunnerCount     int      `json:"runner_count"`
+	}
+
+	solverMap := make(map[string]*solverInfo)
+
+	for _, runner := range runners {
+		if runner.Status != "online" {
+			continue
+		}
+		// Check runner has the solver tag.
+		hasSolverTag := false
+		for _, tag := range runner.Tags {
+			if tag == "solver" {
+				hasSolverTag = true
+				break
+			}
+		}
+		if !hasSolverTag {
+			continue
+		}
+
+		// Extract solver capabilities from runner metadata.
+		if runner.Metadata == nil {
+			continue
+		}
+		solvers, ok := runner.Metadata["solvers"]
+		if !ok {
+			continue
+		}
+
+		// solvers can be []any (array of solver objects or strings).
+		solverList, ok := solvers.([]any)
+		if !ok {
+			continue
+		}
+
+		for _, entry := range solverList {
+			switch v := entry.(type) {
+			case string:
+				// Simple string entry: just the solver name.
+				if _, exists := solverMap[v]; !exists {
+					solverMap[v] = &solverInfo{Name: v}
+				}
+				solverMap[v].RunnerCount++
+			case map[string]any:
+				// Rich entry with name, display_name, supported_joints, etc.
+				name, _ := v["name"].(string)
+				if name == "" {
+					continue
+				}
+				if _, exists := solverMap[name]; !exists {
+					info := &solverInfo{Name: name}
+					if dn, ok := v["display_name"].(string); ok {
+						info.DisplayName = dn
+					}
+					if det, ok := v["deterministic"].(bool); ok {
+						info.Deterministic = det
+					}
+					if joints, ok := v["supported_joints"].([]any); ok {
+						for _, j := range joints {
+							if js, ok := j.(string); ok {
+								info.SupportedJoints = append(info.SupportedJoints, js)
+							}
+						}
+					}
+					solverMap[name] = info
+				}
+				solverMap[name].RunnerCount++
+			}
+		}
+	}
+
+	solverList := make([]*solverInfo, 0, len(solverMap))
+	for _, info := range solverMap {
+		solverList = append(solverList, info)
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"solvers":        solverList,
+		"default_solver": s.cfg.Solver.DefaultSolver,
+	})
+}
+
+// HandleGetSolverResults returns cached solver results for an item.
+// GET /api/items/{partNumber}/solver/results
+func (s *Server) HandleGetSolverResults(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	partNumber := chi.URLParam(r, "partNumber")
+
+	item, err := s.items.GetByPartNumber(ctx, partNumber)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to get item for solver results")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get item")
+		return
+	}
+	if item == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Item not found")
+		return
+	}
+
+	results, err := s.solverResults.GetByItem(ctx, item.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list solver results")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list solver results")
+		return
+	}
+
+	resp := make([]SolverResultResponse, len(results))
+	for i, r := range results {
+		diag := json.RawMessage(r.Diagnostics)
+		if diag == nil {
+			diag = json.RawMessage("[]")
+		}
+		place := json.RawMessage(r.Placements)
+		if place == nil {
+			place = json.RawMessage("[]")
+		}
+		resp[i] = SolverResultResponse{
+			ID:             r.ID,
+			RevisionNumber: r.RevisionNumber,
+			JobID:          r.JobID,
+			Operation:      r.Operation,
+			SolverName:     r.SolverName,
+			Status:         r.Status,
+			DOF:            r.DOF,
+			Diagnostics:    diag,
+			Placements:     place,
+			NumFrames:      r.NumFrames,
+			SolveTimeMS:    r.SolveTimeMS,
+			CreatedAt:      r.CreatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+		}
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// maybeCacheSolverResult is called asynchronously after a job completes.
+// It checks if the job is a solver job and upserts the result into solver_results.
+func (s *Server) maybeCacheSolverResult(ctx context.Context, jobID string) {
+	job, err := s.jobs.GetJob(ctx, jobID)
+	if err != nil || job == nil {
+		s.logger.Warn().Err(err).Str("job_id", jobID).Msg("solver result cache: failed to get job")
+		return
+	}
+
+	if !strings.HasPrefix(job.DefinitionName, "assembly-") {
+		return
+	}
+	if !s.modules.IsEnabled("solver") {
+		return
+	}
+	if job.ItemID == nil {
+		return
+	}
+
+	// Extract fields from scope_metadata.
+	operation, _ := job.ScopeMetadata["operation"].(string)
+	if operation == "" {
+		operation = "solve"
+	}
+	solverName, _ := job.ScopeMetadata["solver"].(string)
+
+	var revisionNumber int
+	if rn, ok := job.ScopeMetadata["revision_number"].(float64); ok {
+		revisionNumber = int(rn)
+	}
+
+	// Extract fields from result.
+	if job.Result == nil {
+		return
+	}
+
+	status, _ := job.Result["status"].(string)
+	if status == "" {
+		// Try nested result object.
+		if inner, ok := job.Result["result"].(map[string]any); ok {
+			status, _ = inner["status"].(string)
+		}
+	}
+	if status == "" {
+		status = "Unknown"
+	}
+
+	// Solver name from result takes precedence.
+	if sn, ok := job.Result["solver_name"].(string); ok && sn != "" {
+		solverName = sn
+	}
+	if solverName == "" {
+		solverName = "unknown"
+	}
+
+	var dof *int
+	if d, ok := job.Result["dof"].(float64); ok {
+		v := int(d)
+		dof = &v
+	} else if inner, ok := job.Result["result"].(map[string]any); ok {
+		if d, ok := inner["dof"].(float64); ok {
+			v := int(d)
+			dof = &v
+		}
+	}
+
+	var solveTimeMS *float64
+	if t, ok := job.Result["solve_time_ms"].(float64); ok {
+		solveTimeMS = &t
+	}
+
+	// Marshal diagnostics and placements as raw JSONB.
+	var diagnostics, placements []byte
+	if d, ok := job.Result["diagnostics"]; ok {
+		diagnostics, _ = json.Marshal(d)
+	} else if inner, ok := job.Result["result"].(map[string]any); ok {
+		if d, ok := inner["diagnostics"]; ok {
+			diagnostics, _ = json.Marshal(d)
+		}
+	}
+	if p, ok := job.Result["placements"]; ok {
+		placements, _ = json.Marshal(p)
+	} else if inner, ok := job.Result["result"].(map[string]any); ok {
+		if p, ok := inner["placements"]; ok {
+			placements, _ = json.Marshal(p)
+		}
+	}
+
+	numFrames := 0
+	if nf, ok := job.Result["num_frames"].(float64); ok {
+		numFrames = int(nf)
+	} else if inner, ok := job.Result["result"].(map[string]any); ok {
+		if nf, ok := inner["num_frames"].(float64); ok {
+			numFrames = int(nf)
+		}
+	}
+
+	result := &db.SolverResult{
+		ItemID:         *job.ItemID,
+		RevisionNumber: revisionNumber,
+		JobID:          &job.ID,
+		Operation:      operation,
+		SolverName:     solverName,
+		Status:         status,
+		DOF:            dof,
+		Diagnostics:    diagnostics,
+		Placements:     placements,
+		NumFrames:      numFrames,
+		SolveTimeMS:    solveTimeMS,
+	}
+
+	if err := s.solverResults.Upsert(ctx, result); err != nil {
+		s.logger.Warn().Err(err).Str("job_id", jobID).Msg("solver result cache: failed to upsert")
+	} else {
+		s.logger.Info().Str("job_id", jobID).Str("operation", operation).Msg("cached solver result")
+	}
+}

internal/api/sse_handler.go

@@ -5,6 +5,8 @@ import (
 	"net/http"
 	"strconv"
 	"time"
+
+	"github.com/kindredsystems/silo/internal/auth"
 )
 
 // HandleEvents serves the SSE event stream.
@@ -31,9 +33,19 @@ func (s *Server) HandleEvents(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Connection", "keep-alive")
 	w.Header().Set("X-Accel-Buffering", "no") // nginx: disable proxy buffering
 
-	client := s.broker.Subscribe()
+	userID := ""
+	if user := auth.UserFromContext(r.Context()); user != nil {
+		userID = user.ID
+	}
+	wsID := r.URL.Query().Get("workstation_id")
+
+	client := s.broker.Subscribe(userID, wsID)
 	defer s.broker.Unsubscribe(client)
 
+	if wsID != "" {
+		s.workstations.Touch(r.Context(), wsID)
+	}
+
 	// Replay missed events if Last-Event-ID is present.
 	if lastIDStr := r.Header.Get("Last-Event-ID"); lastIDStr != "" {
 		if lastID, err := strconv.ParseUint(lastIDStr, 10, 64); err == nil {

internal/api/workstation_handlers.go

@@ -0,0 +1,138 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/kindredsystems/silo/internal/auth"
+	"github.com/kindredsystems/silo/internal/db"
+)
+
+// HandleRegisterWorkstation registers or re-registers a workstation for the current user.
+func (s *Server) HandleRegisterWorkstation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	user := auth.UserFromContext(ctx)
+	if user == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Authentication required")
+		return
+	}
+
+	var req struct {
+		Name     string `json:"name"`
+		Hostname string `json:"hostname"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_json", err.Error())
+		return
+	}
+	if req.Name == "" {
+		writeError(w, http.StatusBadRequest, "validation_error", "name is required")
+		return
+	}
+
+	ws := &db.Workstation{
+		Name:     req.Name,
+		UserID:   user.ID,
+		Hostname: req.Hostname,
+	}
+	if err := s.workstations.Upsert(ctx, ws); err != nil {
+		s.logger.Error().Err(err).Str("name", req.Name).Msg("failed to register workstation")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to register workstation")
+		return
+	}
+
+	s.broker.Publish("workstation.registered", mustMarshal(map[string]any{
+		"id":       ws.ID,
+		"name":     ws.Name,
+		"user_id":  ws.UserID,
+		"hostname": ws.Hostname,
+	}))
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"id":         ws.ID,
+		"name":       ws.Name,
+		"hostname":   ws.Hostname,
+		"last_seen":  ws.LastSeen.UTC().Format("2006-01-02T15:04:05Z"),
+		"created_at": ws.CreatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+	})
+}
+
+// HandleListWorkstations returns all workstations for the current user.
+func (s *Server) HandleListWorkstations(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	user := auth.UserFromContext(ctx)
+	if user == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Authentication required")
+		return
+	}
+
+	workstations, err := s.workstations.ListByUser(ctx, user.ID)
+	if err != nil {
+		s.logger.Error().Err(err).Msg("failed to list workstations")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to list workstations")
+		return
+	}
+
+	type wsResponse struct {
+		ID        string `json:"id"`
+		Name      string `json:"name"`
+		Hostname  string `json:"hostname"`
+		LastSeen  string `json:"last_seen"`
+		CreatedAt string `json:"created_at"`
+	}
+
+	out := make([]wsResponse, len(workstations))
+	for i, ws := range workstations {
+		out[i] = wsResponse{
+			ID:        ws.ID,
+			Name:      ws.Name,
+			Hostname:  ws.Hostname,
+			LastSeen:  ws.LastSeen.UTC().Format("2006-01-02T15:04:05Z"),
+			CreatedAt: ws.CreatedAt.UTC().Format("2006-01-02T15:04:05Z"),
+		}
+	}
+
+	writeJSON(w, http.StatusOK, out)
+}
+
+// HandleDeleteWorkstation removes a workstation owned by the current user (or any, for admins).
+func (s *Server) HandleDeleteWorkstation(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	user := auth.UserFromContext(ctx)
+	if user == nil {
+		writeError(w, http.StatusUnauthorized, "unauthorized", "Authentication required")
+		return
+	}
+
+	id := chi.URLParam(r, "id")
+	ws, err := s.workstations.GetByID(ctx, id)
+	if err != nil {
+		s.logger.Error().Err(err).Str("id", id).Msg("failed to get workstation")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to get workstation")
+		return
+	}
+	if ws == nil {
+		writeError(w, http.StatusNotFound, "not_found", "Workstation not found")
+		return
+	}
+
+	if ws.UserID != user.ID && user.Role != auth.RoleAdmin {
+		writeError(w, http.StatusForbidden, "forbidden", "You can only delete your own workstations")
+		return
+	}
+
+	if err := s.workstations.Delete(ctx, id); err != nil {
+		s.logger.Error().Err(err).Str("id", id).Msg("failed to delete workstation")
+		writeError(w, http.StatusInternalServerError, "internal_error", "Failed to delete workstation")
+		return
+	}
+
+	s.broker.Publish("workstation.removed", mustMarshal(map[string]any{
+		"id":      ws.ID,
+		"name":    ws.Name,
+		"user_id": ws.UserID,
+	}))
+
+	w.WriteHeader(http.StatusNoContent)
+}

internal/auth/runner.go

@@ -0,0 +1,24 @@
+package auth
+
+import "context"
+
+const runnerContextKey contextKey = iota + 1
+
+// RunnerIdentity represents an authenticated runner in the request context.
+type RunnerIdentity struct {
+	ID   string
+	Name string
+	Tags []string
+}
+
+// RunnerFromContext extracts the authenticated runner from the request context.
+// Returns nil if no runner is present.
+func RunnerFromContext(ctx context.Context) *RunnerIdentity {
+	r, _ := ctx.Value(runnerContextKey).(*RunnerIdentity)
+	return r
+}
+
+// ContextWithRunner returns a new context carrying the given runner identity.
+func ContextWithRunner(ctx context.Context, r *RunnerIdentity) context.Context {
+	return context.WithValue(ctx, runnerContextKey, r)
+}

internal/config/config.go

@@ -17,6 +17,30 @@ type Config struct {
 	FreeCAD   FreeCADConfig   `yaml:"freecad"`
 	Odoo      OdooConfig      `yaml:"odoo"`
 	Auth      AuthConfig      `yaml:"auth"`
+	Jobs      JobsConfig      `yaml:"jobs"`
+	Workflows WorkflowsConfig `yaml:"workflows"`
+	Solver    SolverConfig    `yaml:"solver"`
+	Modules   ModulesConfig   `yaml:"modules"`
+}
+
+// ModulesConfig holds explicit enable/disable toggles for optional modules.
+// A nil pointer means "use the module's default state".
+type ModulesConfig struct {
+	Auth     *ModuleToggle `yaml:"auth"`
+	Projects *ModuleToggle `yaml:"projects"`
+	Audit    *ModuleToggle `yaml:"audit"`
+	Odoo     *ModuleToggle `yaml:"odoo"`
+	FreeCAD  *ModuleToggle `yaml:"freecad"`
+	Jobs     *ModuleToggle `yaml:"jobs"`
+	DAG      *ModuleToggle `yaml:"dag"`
+	Solver   *ModuleToggle `yaml:"solver"`
+	Sessions *ModuleToggle `yaml:"sessions"`
+}
+
+// ModuleToggle holds an optional enabled flag. The pointer allows
+// distinguishing "not set" (nil) from "explicitly false".
+type ModuleToggle struct {
+	Enabled *bool `yaml:"enabled"`
 }
 
 // AuthConfig holds authentication and authorization settings.
@@ -89,14 +113,15 @@ type DatabaseConfig struct {
 	MaxConnections int    `yaml:"max_connections"`
 }
 
-// StorageConfig holds MinIO connection settings.
+// StorageConfig holds file storage settings.
 type StorageConfig struct {
-	Endpoint  string `yaml:"endpoint"`
+	Backend    string           `yaml:"backend"` // "filesystem"
-	AccessKey string `yaml:"access_key"`
+	Filesystem FilesystemConfig `yaml:"filesystem"`
-	SecretKey string `yaml:"secret_key"`
+}
-	Bucket    string `yaml:"bucket"`
+
-	UseSSL    bool   `yaml:"use_ssl"`
+// FilesystemConfig holds local filesystem storage settings.
-	Region    string `yaml:"region"`
+type FilesystemConfig struct {
+	RootDir string `yaml:"root_dir"`
 }
 
 // SchemasConfig holds schema loading settings.
@@ -111,6 +136,27 @@ type FreeCADConfig struct {
 	Executable string `yaml:"executable"`
 }
 
+// JobsConfig holds worker/runner system settings.
+type JobsConfig struct {
+	Directory       string `yaml:"directory"`         // default /etc/silo/jobdefs
+	RunnerTimeout   int    `yaml:"runner_timeout"`    // seconds, default 90
+	JobTimeoutCheck int    `yaml:"job_timeout_check"` // seconds, default 30
+	DefaultPriority int    `yaml:"default_priority"`  // default 100
+}
+
+// WorkflowsConfig holds approval workflow definition settings.
+type WorkflowsConfig struct {
+	Directory string `yaml:"directory"` // default /etc/silo/workflows
+}
+
+// SolverConfig holds assembly solver service settings.
+type SolverConfig struct {
+	DefaultSolver        string `yaml:"default_solver"`
+	MaxContextSizeMB     int    `yaml:"max_context_size_mb"`
+	DefaultTimeout       int    `yaml:"default_timeout"`
+	AutoDiagnoseOnCommit bool   `yaml:"auto_diagnose_on_commit"`
+}
+
 // OdooConfig holds Odoo ERP integration settings.
 type OdooConfig struct {
 	Enabled  bool   `yaml:"enabled"`
@@ -148,15 +194,33 @@ func Load(path string) (*Config, error) {
 	if cfg.Database.MaxConnections == 0 {
 		cfg.Database.MaxConnections = 10
 	}
-	if cfg.Storage.Region == "" {
-		cfg.Storage.Region = "us-east-1"
-	}
 	if cfg.Schemas.Directory == "" {
 		cfg.Schemas.Directory = "/etc/silo/schemas"
 	}
 	if cfg.FreeCAD.URIScheme == "" {
 		cfg.FreeCAD.URIScheme = "silo"
 	}
+	if cfg.Jobs.Directory == "" {
+		cfg.Jobs.Directory = "/etc/silo/jobdefs"
+	}
+	if cfg.Jobs.RunnerTimeout == 0 {
+		cfg.Jobs.RunnerTimeout = 90
+	}
+	if cfg.Jobs.JobTimeoutCheck == 0 {
+		cfg.Jobs.JobTimeoutCheck = 30
+	}
+	if cfg.Jobs.DefaultPriority == 0 {
+		cfg.Jobs.DefaultPriority = 100
+	}
+	if cfg.Workflows.Directory == "" {
+		cfg.Workflows.Directory = "/etc/silo/workflows"
+	}
+	if cfg.Solver.MaxContextSizeMB == 0 {
+		cfg.Solver.MaxContextSizeMB = 10
+	}
+	if cfg.Solver.DefaultTimeout == 0 {
+		cfg.Solver.DefaultTimeout = 300
+	}
 
 	// Override with environment variables
 	if v := os.Getenv("SILO_DB_HOST"); v != "" {
@@ -171,14 +235,11 @@ func Load(path string) (*Config, error) {
 	if v := os.Getenv("SILO_DB_PASSWORD"); v != "" {
 		cfg.Database.Password = v
 	}
-	if v := os.Getenv("SILO_MINIO_ENDPOINT"); v != "" {
+	if v := os.Getenv("SILO_STORAGE_ROOT_DIR"); v != "" {
-		cfg.Storage.Endpoint = v
+		cfg.Storage.Filesystem.RootDir = v
 	}
-	if v := os.Getenv("SILO_MINIO_ACCESS_KEY"); v != "" {
+	if v := os.Getenv("SILO_SOLVER_DEFAULT"); v != "" {
-		cfg.Storage.AccessKey = v
+		cfg.Solver.DefaultSolver = v
-	}
-	if v := os.Getenv("SILO_MINIO_SECRET_KEY"); v != "" {
-		cfg.Storage.SecretKey = v
 	}
 
 	// Auth defaults

internal/db/dag.go

@@ -0,0 +1,520 @@
+package db
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// DAGNode represents a feature-level node in the dependency graph.
+type DAGNode struct {
+	ID              string
+	ItemID          string
+	RevisionNumber  int
+	NodeKey         string
+	NodeType        string
+	PropertiesHash  *string
+	ValidationState string
+	ValidationMsg   *string
+	Metadata        map[string]any
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
+}
+
+// DAGEdge represents a dependency between two nodes.
+type DAGEdge struct {
+	ID           string
+	SourceNodeID string
+	TargetNodeID string
+	EdgeType     string
+	Metadata     map[string]any
+}
+
+// DAGCrossEdge represents a dependency between nodes in different items.
+type DAGCrossEdge struct {
+	ID             string
+	SourceNodeID   string
+	TargetNodeID   string
+	RelationshipID *string
+	EdgeType       string
+	Metadata       map[string]any
+}
+
+// DAGRepository provides dependency graph database operations.
+type DAGRepository struct {
+	db *DB
+}
+
+// NewDAGRepository creates a new DAG repository.
+func NewDAGRepository(db *DB) *DAGRepository {
+	return &DAGRepository{db: db}
+}
+
+// GetNodes returns all DAG nodes for an item at a specific revision.
+func (r *DAGRepository) GetNodes(ctx context.Context, itemID string, revisionNumber int) ([]*DAGNode, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, item_id, revision_number, node_key, node_type,
+		       properties_hash, validation_state, validation_msg,
+		       metadata, created_at, updated_at
+		FROM dag_nodes
+		WHERE item_id = $1 AND revision_number = $2
+		ORDER BY node_key
+	`, itemID, revisionNumber)
+	if err != nil {
+		return nil, fmt.Errorf("querying DAG nodes: %w", err)
+	}
+	defer rows.Close()
+	return scanDAGNodes(rows)
+}
+
+// GetNodeByKey returns a single DAG node by item, revision, and key.
+func (r *DAGRepository) GetNodeByKey(ctx context.Context, itemID string, revisionNumber int, nodeKey string) (*DAGNode, error) {
+	n := &DAGNode{}
+	var metadataJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, item_id, revision_number, node_key, node_type,
+		       properties_hash, validation_state, validation_msg,
+		       metadata, created_at, updated_at
+		FROM dag_nodes
+		WHERE item_id = $1 AND revision_number = $2 AND node_key = $3
+	`, itemID, revisionNumber, nodeKey).Scan(
+		&n.ID, &n.ItemID, &n.RevisionNumber, &n.NodeKey, &n.NodeType,
+		&n.PropertiesHash, &n.ValidationState, &n.ValidationMsg,
+		&metadataJSON, &n.CreatedAt, &n.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying DAG node: %w", err)
+	}
+	if metadataJSON != nil {
+		if err := json.Unmarshal(metadataJSON, &n.Metadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling node metadata: %w", err)
+		}
+	}
+	return n, nil
+}
+
+// GetNodeByID returns a single DAG node by its ID.
+func (r *DAGRepository) GetNodeByID(ctx context.Context, nodeID string) (*DAGNode, error) {
+	n := &DAGNode{}
+	var metadataJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, item_id, revision_number, node_key, node_type,
+		       properties_hash, validation_state, validation_msg,
+		       metadata, created_at, updated_at
+		FROM dag_nodes
+		WHERE id = $1
+	`, nodeID).Scan(
+		&n.ID, &n.ItemID, &n.RevisionNumber, &n.NodeKey, &n.NodeType,
+		&n.PropertiesHash, &n.ValidationState, &n.ValidationMsg,
+		&metadataJSON, &n.CreatedAt, &n.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying DAG node by ID: %w", err)
+	}
+	if metadataJSON != nil {
+		if err := json.Unmarshal(metadataJSON, &n.Metadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling node metadata: %w", err)
+		}
+	}
+	return n, nil
+}
+
+// UpsertNode inserts or updates a single DAG node.
+func (r *DAGRepository) UpsertNode(ctx context.Context, n *DAGNode) error {
+	metadataJSON, err := json.Marshal(n.Metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling metadata: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO dag_nodes (item_id, revision_number, node_key, node_type,
+		                       properties_hash, validation_state, validation_msg, metadata)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+		ON CONFLICT (item_id, revision_number, node_key)
+		DO UPDATE SET
+			node_type = EXCLUDED.node_type,
+			properties_hash = EXCLUDED.properties_hash,
+			validation_state = EXCLUDED.validation_state,
+			validation_msg = EXCLUDED.validation_msg,
+			metadata = EXCLUDED.metadata,
+			updated_at = now()
+		RETURNING id, created_at, updated_at
+	`, n.ItemID, n.RevisionNumber, n.NodeKey, n.NodeType,
+		n.PropertiesHash, n.ValidationState, n.ValidationMsg, metadataJSON,
+	).Scan(&n.ID, &n.CreatedAt, &n.UpdatedAt)
+	if err != nil {
+		return fmt.Errorf("upserting DAG node: %w", err)
+	}
+	return nil
+}
+
+// GetEdges returns all edges for nodes belonging to an item at a specific revision.
+func (r *DAGRepository) GetEdges(ctx context.Context, itemID string, revisionNumber int) ([]*DAGEdge, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT e.id, e.source_node_id, e.target_node_id, e.edge_type, e.metadata
+		FROM dag_edges e
+		JOIN dag_nodes src ON src.id = e.source_node_id
+		WHERE src.item_id = $1 AND src.revision_number = $2
+		ORDER BY e.source_node_id, e.target_node_id
+	`, itemID, revisionNumber)
+	if err != nil {
+		return nil, fmt.Errorf("querying DAG edges: %w", err)
+	}
+	defer rows.Close()
+
+	var edges []*DAGEdge
+	for rows.Next() {
+		e := &DAGEdge{}
+		var metadataJSON []byte
+		if err := rows.Scan(&e.ID, &e.SourceNodeID, &e.TargetNodeID, &e.EdgeType, &metadataJSON); err != nil {
+			return nil, fmt.Errorf("scanning DAG edge: %w", err)
+		}
+		if metadataJSON != nil {
+			if err := json.Unmarshal(metadataJSON, &e.Metadata); err != nil {
+				return nil, fmt.Errorf("unmarshaling edge metadata: %w", err)
+			}
+		}
+		edges = append(edges, e)
+	}
+	return edges, rows.Err()
+}
+
+// CreateEdge inserts a new edge between two nodes.
+func (r *DAGRepository) CreateEdge(ctx context.Context, e *DAGEdge) error {
+	if e.EdgeType == "" {
+		e.EdgeType = "depends_on"
+	}
+	metadataJSON, err := json.Marshal(e.Metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling edge metadata: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO dag_edges (source_node_id, target_node_id, edge_type, metadata)
+		VALUES ($1, $2, $3, $4)
+		ON CONFLICT (source_node_id, target_node_id, edge_type) DO NOTHING
+		RETURNING id
+	`, e.SourceNodeID, e.TargetNodeID, e.EdgeType, metadataJSON).Scan(&e.ID)
+	if err == pgx.ErrNoRows {
+		// Edge already exists, not an error
+		return nil
+	}
+	if err != nil {
+		return fmt.Errorf("creating DAG edge: %w", err)
+	}
+	return nil
+}
+
+// DeleteEdgesForItem removes all edges for nodes belonging to an item/revision.
+func (r *DAGRepository) DeleteEdgesForItem(ctx context.Context, itemID string, revisionNumber int) error {
+	_, err := r.db.pool.Exec(ctx, `
+		DELETE FROM dag_edges
+		WHERE source_node_id IN (
+			SELECT id FROM dag_nodes WHERE item_id = $1 AND revision_number = $2
+		)
+	`, itemID, revisionNumber)
+	if err != nil {
+		return fmt.Errorf("deleting edges for item: %w", err)
+	}
+	return nil
+}
+
+// GetForwardCone returns all downstream dependent nodes reachable from the
+// given node via edges. This is the key query for interference detection.
+func (r *DAGRepository) GetForwardCone(ctx context.Context, nodeID string) ([]*DAGNode, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		WITH RECURSIVE forward_cone AS (
+			SELECT target_node_id AS node_id
+			FROM dag_edges
+			WHERE source_node_id = $1
+			UNION
+			SELECT e.target_node_id
+			FROM dag_edges e
+			JOIN forward_cone fc ON fc.node_id = e.source_node_id
+		)
+		SELECT n.id, n.item_id, n.revision_number, n.node_key, n.node_type,
+		       n.properties_hash, n.validation_state, n.validation_msg,
+		       n.metadata, n.created_at, n.updated_at
+		FROM dag_nodes n
+		JOIN forward_cone fc ON n.id = fc.node_id
+		ORDER BY n.node_key
+	`, nodeID)
+	if err != nil {
+		return nil, fmt.Errorf("querying forward cone: %w", err)
+	}
+	defer rows.Close()
+	return scanDAGNodes(rows)
+}
+
+// GetBackwardCone returns all upstream dependency nodes that the given
+// node depends on.
+func (r *DAGRepository) GetBackwardCone(ctx context.Context, nodeID string) ([]*DAGNode, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		WITH RECURSIVE backward_cone AS (
+			SELECT source_node_id AS node_id
+			FROM dag_edges
+			WHERE target_node_id = $1
+			UNION
+			SELECT e.source_node_id
+			FROM dag_edges e
+			JOIN backward_cone bc ON bc.node_id = e.target_node_id
+		)
+		SELECT n.id, n.item_id, n.revision_number, n.node_key, n.node_type,
+		       n.properties_hash, n.validation_state, n.validation_msg,
+		       n.metadata, n.created_at, n.updated_at
+		FROM dag_nodes n
+		JOIN backward_cone bc ON n.id = bc.node_id
+		ORDER BY n.node_key
+	`, nodeID)
+	if err != nil {
+		return nil, fmt.Errorf("querying backward cone: %w", err)
+	}
+	defer rows.Close()
+	return scanDAGNodes(rows)
+}
+
+// GetDirtySubgraph returns all non-clean nodes for an item.
+func (r *DAGRepository) GetDirtySubgraph(ctx context.Context, itemID string) ([]*DAGNode, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, item_id, revision_number, node_key, node_type,
+		       properties_hash, validation_state, validation_msg,
+		       metadata, created_at, updated_at
+		FROM dag_nodes
+		WHERE item_id = $1 AND validation_state != 'clean'
+		ORDER BY node_key
+	`, itemID)
+	if err != nil {
+		return nil, fmt.Errorf("querying dirty subgraph: %w", err)
+	}
+	defer rows.Close()
+	return scanDAGNodes(rows)
+}
+
+// MarkDirty marks a node and all its downstream dependents as dirty.
+func (r *DAGRepository) MarkDirty(ctx context.Context, nodeID string) (int64, error) {
+	result, err := r.db.pool.Exec(ctx, `
+		WITH RECURSIVE forward_cone AS (
+			SELECT $1::uuid AS node_id
+			UNION
+			SELECT e.target_node_id
+			FROM dag_edges e
+			JOIN forward_cone fc ON fc.node_id = e.source_node_id
+		)
+		UPDATE dag_nodes SET validation_state = 'dirty', updated_at = now()
+		WHERE id IN (SELECT node_id FROM forward_cone)
+		  AND validation_state = 'clean'
+	`, nodeID)
+	if err != nil {
+		return 0, fmt.Errorf("marking dirty: %w", err)
+	}
+	return result.RowsAffected(), nil
+}
+
+// MarkValidating sets a node's state to 'validating'.
+func (r *DAGRepository) MarkValidating(ctx context.Context, nodeID string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE dag_nodes SET validation_state = 'validating', updated_at = now()
+		WHERE id = $1
+	`, nodeID)
+	if err != nil {
+		return fmt.Errorf("marking validating: %w", err)
+	}
+	return nil
+}
+
+// MarkClean sets a node's state to 'clean' and updates its properties hash.
+func (r *DAGRepository) MarkClean(ctx context.Context, nodeID string, propertiesHash string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE dag_nodes
+		SET validation_state = 'clean',
+		    properties_hash = $2,
+		    validation_msg = NULL,
+		    updated_at = now()
+		WHERE id = $1
+	`, nodeID, propertiesHash)
+	if err != nil {
+		return fmt.Errorf("marking clean: %w", err)
+	}
+	return nil
+}
+
+// MarkFailed sets a node's state to 'failed' with an error message.
+func (r *DAGRepository) MarkFailed(ctx context.Context, nodeID string, message string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE dag_nodes
+		SET validation_state = 'failed',
+		    validation_msg = $2,
+		    updated_at = now()
+		WHERE id = $1
+	`, nodeID, message)
+	if err != nil {
+		return fmt.Errorf("marking failed: %w", err)
+	}
+	return nil
+}
+
+// HasCycle checks whether adding an edge from sourceID to targetID would
+// create a cycle. It walks upward from sourceID to see if targetID is
+// already an ancestor.
+func (r *DAGRepository) HasCycle(ctx context.Context, sourceID, targetID string) (bool, error) {
+	if sourceID == targetID {
+		return true, nil
+	}
+	var hasCycle bool
+	err := r.db.pool.QueryRow(ctx, `
+		WITH RECURSIVE ancestors AS (
+			SELECT source_node_id AS node_id
+			FROM dag_edges
+			WHERE target_node_id = $1
+			UNION
+			SELECT e.source_node_id
+			FROM dag_edges e
+			JOIN ancestors a ON a.node_id = e.target_node_id
+		)
+		SELECT EXISTS (
+			SELECT 1 FROM ancestors WHERE node_id = $2
+		)
+	`, sourceID, targetID).Scan(&hasCycle)
+	if err != nil {
+		return false, fmt.Errorf("checking for cycle: %w", err)
+	}
+	return hasCycle, nil
+}
+
+// SyncFeatureTree replaces the entire feature DAG for an item/revision
+// within a single transaction. It upserts nodes, replaces edges, and
+// marks changed nodes dirty.
+func (r *DAGRepository) SyncFeatureTree(ctx context.Context, itemID string, revisionNumber int, nodes []DAGNode, edges []DAGEdge) error {
+	tx, err := r.db.pool.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("beginning transaction: %w", err)
+	}
+	defer tx.Rollback(ctx)
+
+	// Upsert all nodes
+	for i := range nodes {
+		n := &nodes[i]
+		n.ItemID = itemID
+		n.RevisionNumber = revisionNumber
+		if n.ValidationState == "" {
+			n.ValidationState = "clean"
+		}
+
+		metadataJSON, err := json.Marshal(n.Metadata)
+		if err != nil {
+			return fmt.Errorf("marshaling node metadata: %w", err)
+		}
+
+		err = tx.QueryRow(ctx, `
+			INSERT INTO dag_nodes (item_id, revision_number, node_key, node_type,
+			                       properties_hash, validation_state, validation_msg, metadata)
+			VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+			ON CONFLICT (item_id, revision_number, node_key)
+			DO UPDATE SET
+				node_type = EXCLUDED.node_type,
+				properties_hash = EXCLUDED.properties_hash,
+				metadata = EXCLUDED.metadata,
+				updated_at = now()
+			RETURNING id, created_at, updated_at
+		`, n.ItemID, n.RevisionNumber, n.NodeKey, n.NodeType,
+			n.PropertiesHash, n.ValidationState, n.ValidationMsg, metadataJSON,
+		).Scan(&n.ID, &n.CreatedAt, &n.UpdatedAt)
+		if err != nil {
+			return fmt.Errorf("upserting node %s: %w", n.NodeKey, err)
+		}
+	}
+
+	// Build key→ID map for edge resolution
+	keyToID := make(map[string]string, len(nodes))
+	for _, n := range nodes {
+		keyToID[n.NodeKey] = n.ID
+	}
+
+	// Delete existing edges for this item/revision
+	_, err = tx.Exec(ctx, `
+		DELETE FROM dag_edges
+		WHERE source_node_id IN (
+			SELECT id FROM dag_nodes WHERE item_id = $1 AND revision_number = $2
+		)
+	`, itemID, revisionNumber)
+	if err != nil {
+		return fmt.Errorf("deleting old edges: %w", err)
+	}
+
+	// Insert new edges
+	for i := range edges {
+		e := &edges[i]
+		if e.EdgeType == "" {
+			e.EdgeType = "depends_on"
+		}
+
+		// Resolve source/target from node keys if IDs are not set
+		sourceID := e.SourceNodeID
+		targetID := e.TargetNodeID
+		if sourceID == "" {
+			return fmt.Errorf("edge %d: source_node_id is required", i)
+		}
+		if targetID == "" {
+			return fmt.Errorf("edge %d: target_node_id is required", i)
+		}
+
+		metadataJSON, err := json.Marshal(e.Metadata)
+		if err != nil {
+			return fmt.Errorf("marshaling edge metadata: %w", err)
+		}
+
+		err = tx.QueryRow(ctx, `
+			INSERT INTO dag_edges (source_node_id, target_node_id, edge_type, metadata)
+			VALUES ($1, $2, $3, $4)
+			RETURNING id
+		`, sourceID, targetID, e.EdgeType, metadataJSON).Scan(&e.ID)
+		if err != nil {
+			return fmt.Errorf("creating edge: %w", err)
+		}
+	}
+
+	return tx.Commit(ctx)
+}
+
+// DeleteNodesForItem removes all DAG nodes (and cascades to edges) for an item/revision.
+func (r *DAGRepository) DeleteNodesForItem(ctx context.Context, itemID string, revisionNumber int) error {
+	_, err := r.db.pool.Exec(ctx, `
+		DELETE FROM dag_nodes WHERE item_id = $1 AND revision_number = $2
+	`, itemID, revisionNumber)
+	if err != nil {
+		return fmt.Errorf("deleting nodes for item: %w", err)
+	}
+	return nil
+}
+
+func scanDAGNodes(rows pgx.Rows) ([]*DAGNode, error) {
+	var nodes []*DAGNode
+	for rows.Next() {
+		n := &DAGNode{}
+		var metadataJSON []byte
+		err := rows.Scan(
+			&n.ID, &n.ItemID, &n.RevisionNumber, &n.NodeKey, &n.NodeType,
+			&n.PropertiesHash, &n.ValidationState, &n.ValidationMsg,
+			&metadataJSON, &n.CreatedAt, &n.UpdatedAt,
+		)
+		if err != nil {
+			return nil, fmt.Errorf("scanning DAG node: %w", err)
+		}
+		if metadataJSON != nil {
+			if err := json.Unmarshal(metadataJSON, &n.Metadata); err != nil {
+				return nil, fmt.Errorf("unmarshaling node metadata: %w", err)
+			}
+		}
+		nodes = append(nodes, n)
+	}
+	return nodes, rows.Err()
+}

internal/db/item_approvals.go

@@ -0,0 +1,212 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// ItemApproval represents a row in the item_approvals table.
+type ItemApproval struct {
+	ID           string
+	ItemID       string
+	WorkflowName string
+	ECONumber    *string
+	State        string // draft | pending | approved | rejected
+	UpdatedAt    time.Time
+	UpdatedBy    *string
+	Signatures   []ApprovalSignature // populated by WithSignatures methods
+}
+
+// ApprovalSignature represents a row in the approval_signatures table.
+type ApprovalSignature struct {
+	ID         string
+	ApprovalID string
+	Username   string
+	Role       string
+	Status     string // pending | approved | rejected
+	SignedAt   *time.Time
+	Comment    *string
+}
+
+// ItemApprovalRepository provides item_approvals database operations.
+type ItemApprovalRepository struct {
+	db *DB
+}
+
+// NewItemApprovalRepository creates a new item approval repository.
+func NewItemApprovalRepository(db *DB) *ItemApprovalRepository {
+	return &ItemApprovalRepository{db: db}
+}
+
+// Create inserts a new approval row. The ID is populated on return.
+func (r *ItemApprovalRepository) Create(ctx context.Context, a *ItemApproval) error {
+	return r.db.pool.QueryRow(ctx, `
+		INSERT INTO item_approvals (item_id, workflow_name, eco_number, state, updated_by)
+		VALUES ($1, $2, $3, $4, $5)
+		RETURNING id, updated_at
+	`, a.ItemID, a.WorkflowName, a.ECONumber, a.State, a.UpdatedBy).Scan(&a.ID, &a.UpdatedAt)
+}
+
+// AddSignature inserts a new signature row. The ID is populated on return.
+func (r *ItemApprovalRepository) AddSignature(ctx context.Context, s *ApprovalSignature) error {
+	return r.db.pool.QueryRow(ctx, `
+		INSERT INTO approval_signatures (approval_id, username, role, status)
+		VALUES ($1, $2, $3, $4)
+		RETURNING id
+	`, s.ApprovalID, s.Username, s.Role, s.Status).Scan(&s.ID)
+}
+
+// GetWithSignatures returns a single approval with its signatures.
+func (r *ItemApprovalRepository) GetWithSignatures(ctx context.Context, approvalID string) (*ItemApproval, error) {
+	a := &ItemApproval{}
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, item_id, workflow_name, eco_number, state, updated_at, updated_by
+		FROM item_approvals
+		WHERE id = $1
+	`, approvalID).Scan(&a.ID, &a.ItemID, &a.WorkflowName, &a.ECONumber, &a.State, &a.UpdatedAt, &a.UpdatedBy)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("getting approval: %w", err)
+	}
+
+	sigs, err := r.signaturesForApproval(ctx, approvalID)
+	if err != nil {
+		return nil, err
+	}
+	a.Signatures = sigs
+	return a, nil
+}
+
+// ListByItemWithSignatures returns all approvals for an item, each with signatures.
+func (r *ItemApprovalRepository) ListByItemWithSignatures(ctx context.Context, itemID string) ([]*ItemApproval, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, item_id, workflow_name, eco_number, state, updated_at, updated_by
+		FROM item_approvals
+		WHERE item_id = $1
+		ORDER BY updated_at DESC
+	`, itemID)
+	if err != nil {
+		return nil, fmt.Errorf("listing approvals: %w", err)
+	}
+	defer rows.Close()
+
+	var approvals []*ItemApproval
+	var approvalIDs []string
+	for rows.Next() {
+		a := &ItemApproval{}
+		if err := rows.Scan(&a.ID, &a.ItemID, &a.WorkflowName, &a.ECONumber, &a.State, &a.UpdatedAt, &a.UpdatedBy); err != nil {
+			return nil, fmt.Errorf("scanning approval: %w", err)
+		}
+		approvals = append(approvals, a)
+		approvalIDs = append(approvalIDs, a.ID)
+	}
+
+	if len(approvalIDs) == 0 {
+		return approvals, nil
+	}
+
+	// Batch-fetch all signatures
+	sigRows, err := r.db.pool.Query(ctx, `
+		SELECT id, approval_id, username, role, status, signed_at, comment
+		FROM approval_signatures
+		WHERE approval_id = ANY($1)
+		ORDER BY username
+	`, approvalIDs)
+	if err != nil {
+		return nil, fmt.Errorf("listing signatures: %w", err)
+	}
+	defer sigRows.Close()
+
+	sigMap := make(map[string][]ApprovalSignature)
+	for sigRows.Next() {
+		var s ApprovalSignature
+		if err := sigRows.Scan(&s.ID, &s.ApprovalID, &s.Username, &s.Role, &s.Status, &s.SignedAt, &s.Comment); err != nil {
+			return nil, fmt.Errorf("scanning signature: %w", err)
+		}
+		sigMap[s.ApprovalID] = append(sigMap[s.ApprovalID], s)
+	}
+
+	for _, a := range approvals {
+		a.Signatures = sigMap[a.ID]
+		if a.Signatures == nil {
+			a.Signatures = []ApprovalSignature{}
+		}
+	}
+
+	return approvals, nil
+}
+
+// UpdateState updates the approval state and updated_by.
+func (r *ItemApprovalRepository) UpdateState(ctx context.Context, approvalID, state, updatedBy string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE item_approvals
+		SET state = $2, updated_by = $3, updated_at = now()
+		WHERE id = $1
+	`, approvalID, state, updatedBy)
+	if err != nil {
+		return fmt.Errorf("updating approval state: %w", err)
+	}
+	return nil
+}
+
+// GetSignatureForUser returns the signature for a specific user on an approval.
+func (r *ItemApprovalRepository) GetSignatureForUser(ctx context.Context, approvalID, username string) (*ApprovalSignature, error) {
+	s := &ApprovalSignature{}
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, approval_id, username, role, status, signed_at, comment
+		FROM approval_signatures
+		WHERE approval_id = $1 AND username = $2
+	`, approvalID, username).Scan(&s.ID, &s.ApprovalID, &s.Username, &s.Role, &s.Status, &s.SignedAt, &s.Comment)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("getting signature: %w", err)
+	}
+	return s, nil
+}
+
+// UpdateSignature updates a signature's status, comment, and signed_at timestamp.
+func (r *ItemApprovalRepository) UpdateSignature(ctx context.Context, sigID, status string, comment *string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE approval_signatures
+		SET status = $2, comment = $3, signed_at = now()
+		WHERE id = $1
+	`, sigID, status, comment)
+	if err != nil {
+		return fmt.Errorf("updating signature: %w", err)
+	}
+	return nil
+}
+
+// signaturesForApproval returns all signatures for a single approval.
+func (r *ItemApprovalRepository) signaturesForApproval(ctx context.Context, approvalID string) ([]ApprovalSignature, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, approval_id, username, role, status, signed_at, comment
+		FROM approval_signatures
+		WHERE approval_id = $1
+		ORDER BY username
+	`, approvalID)
+	if err != nil {
+		return nil, fmt.Errorf("listing signatures: %w", err)
+	}
+	defer rows.Close()
+
+	var sigs []ApprovalSignature
+	for rows.Next() {
+		var s ApprovalSignature
+		if err := rows.Scan(&s.ID, &s.ApprovalID, &s.Username, &s.Role, &s.Status, &s.SignedAt, &s.Comment); err != nil {
+			return nil, fmt.Errorf("scanning signature: %w", err)
+		}
+		sigs = append(sigs, s)
+	}
+	if sigs == nil {
+		sigs = []ApprovalSignature{}
+	}
+	return sigs, nil
+}

internal/db/item_dependencies.go

@@ -0,0 +1,127 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// ItemDependency represents a row in the item_dependencies table.
+type ItemDependency struct {
+	ID              string
+	ParentItemID    string
+	ChildUUID       string
+	ChildPartNumber *string
+	ChildRevision   *int
+	Quantity        *float64
+	Label           *string
+	Relationship    string
+	RevisionNumber  int
+	CreatedAt       time.Time
+}
+
+// ResolvedDependency extends ItemDependency with resolution info from a LEFT JOIN.
+type ResolvedDependency struct {
+	ItemDependency
+	ResolvedPartNumber *string
+	ResolvedRevision   *int
+	Resolved           bool
+}
+
+// ItemDependencyRepository provides item_dependencies database operations.
+type ItemDependencyRepository struct {
+	db *DB
+}
+
+// NewItemDependencyRepository creates a new item dependency repository.
+func NewItemDependencyRepository(db *DB) *ItemDependencyRepository {
+	return &ItemDependencyRepository{db: db}
+}
+
+// ReplaceForRevision atomically replaces all dependencies for an item's revision.
+// Deletes existing rows for the parent item and inserts the new set.
+func (r *ItemDependencyRepository) ReplaceForRevision(ctx context.Context, parentItemID string, revisionNumber int, deps []*ItemDependency) error {
+	return r.db.Tx(ctx, func(tx pgx.Tx) error {
+		_, err := tx.Exec(ctx, `DELETE FROM item_dependencies WHERE parent_item_id = $1`, parentItemID)
+		if err != nil {
+			return fmt.Errorf("deleting old dependencies: %w", err)
+		}
+
+		for _, d := range deps {
+			_, err := tx.Exec(ctx, `
+				INSERT INTO item_dependencies
+					(parent_item_id, child_uuid, child_part_number, child_revision,
+					 quantity, label, relationship, revision_number)
+				VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+			`, parentItemID, d.ChildUUID, d.ChildPartNumber, d.ChildRevision,
+				d.Quantity, d.Label, d.Relationship, revisionNumber)
+			if err != nil {
+				return fmt.Errorf("inserting dependency: %w", err)
+			}
+		}
+		return nil
+	})
+}
+
+// ListByItem returns all dependencies for an item.
+func (r *ItemDependencyRepository) ListByItem(ctx context.Context, parentItemID string) ([]*ItemDependency, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, parent_item_id, child_uuid, child_part_number, child_revision,
+		       quantity, label, relationship, revision_number, created_at
+		FROM item_dependencies
+		WHERE parent_item_id = $1
+		ORDER BY label NULLS LAST
+	`, parentItemID)
+	if err != nil {
+		return nil, fmt.Errorf("listing dependencies: %w", err)
+	}
+	defer rows.Close()
+
+	var deps []*ItemDependency
+	for rows.Next() {
+		d := &ItemDependency{}
+		if err := rows.Scan(
+			&d.ID, &d.ParentItemID, &d.ChildUUID, &d.ChildPartNumber, &d.ChildRevision,
+			&d.Quantity, &d.Label, &d.Relationship, &d.RevisionNumber, &d.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scanning dependency: %w", err)
+		}
+		deps = append(deps, d)
+	}
+	return deps, nil
+}
+
+// Resolve returns dependencies with child UUIDs resolved against the items table.
+// Unresolvable UUIDs (external or deleted items) have Resolved=false.
+func (r *ItemDependencyRepository) Resolve(ctx context.Context, parentItemID string) ([]*ResolvedDependency, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT d.id, d.parent_item_id, d.child_uuid, d.child_part_number, d.child_revision,
+		       d.quantity, d.label, d.relationship, d.revision_number, d.created_at,
+		       i.part_number, i.current_revision
+		FROM item_dependencies d
+		LEFT JOIN items i ON i.id = d.child_uuid AND i.archived_at IS NULL
+		WHERE d.parent_item_id = $1
+		ORDER BY d.label NULLS LAST
+	`, parentItemID)
+	if err != nil {
+		return nil, fmt.Errorf("resolving dependencies: %w", err)
+	}
+	defer rows.Close()
+
+	var deps []*ResolvedDependency
+	for rows.Next() {
+		d := &ResolvedDependency{}
+		if err := rows.Scan(
+			&d.ID, &d.ParentItemID, &d.ChildUUID, &d.ChildPartNumber, &d.ChildRevision,
+			&d.Quantity, &d.Label, &d.Relationship, &d.RevisionNumber, &d.CreatedAt,
+			&d.ResolvedPartNumber, &d.ResolvedRevision,
+		); err != nil {
+			return nil, fmt.Errorf("scanning resolved dependency: %w", err)
+		}
+		d.Resolved = d.ResolvedPartNumber != nil
+		deps = append(deps, d)
+	}
+	return deps, nil
+}

internal/db/item_files.go

@@ -14,6 +14,7 @@ type ItemFile struct {
 	ContentType    string
 	Size           int64
 	ObjectKey      string
+	StorageBackend string
 	CreatedAt      time.Time
 }
 
@@ -29,11 +30,14 @@ func NewItemFileRepository(db *DB) *ItemFileRepository {
 
 // Create inserts a new item file record.
 func (r *ItemFileRepository) Create(ctx context.Context, f *ItemFile) error {
+	if f.StorageBackend == "" {
+		f.StorageBackend = "filesystem"
+	}
 	err := r.db.pool.QueryRow(ctx,
-		`INSERT INTO item_files (item_id, filename, content_type, size, object_key)
+		`INSERT INTO item_files (item_id, filename, content_type, size, object_key, storage_backend)
-		 VALUES ($1, $2, $3, $4, $5)
+		 VALUES ($1, $2, $3, $4, $5, $6)
 		 RETURNING id, created_at`,
-		f.ItemID, f.Filename, f.ContentType, f.Size, f.ObjectKey,
+		f.ItemID, f.Filename, f.ContentType, f.Size, f.ObjectKey, f.StorageBackend,
 	).Scan(&f.ID, &f.CreatedAt)
 	if err != nil {
 		return fmt.Errorf("creating item file: %w", err)
@@ -44,7 +48,8 @@ func (r *ItemFileRepository) Create(ctx context.Context, f *ItemFile) error {
 // ListByItem returns all file attachments for an item.
 func (r *ItemFileRepository) ListByItem(ctx context.Context, itemID string) ([]*ItemFile, error) {
 	rows, err := r.db.pool.Query(ctx,
-		`SELECT id, item_id, filename, content_type, size, object_key, created_at
+		`SELECT id, item_id, filename, content_type, size, object_key,
+		        COALESCE(storage_backend, 'filesystem'), created_at
 		 FROM item_files WHERE item_id = $1 ORDER BY created_at`,
 		itemID,
 	)
@@ -56,7 +61,7 @@ func (r *ItemFileRepository) ListByItem(ctx context.Context, itemID string) ([]*
 	var files []*ItemFile
 	for rows.Next() {
 		f := &ItemFile{}
-		if err := rows.Scan(&f.ID, &f.ItemID, &f.Filename, &f.ContentType, &f.Size, &f.ObjectKey, &f.CreatedAt); err != nil {
+		if err := rows.Scan(&f.ID, &f.ItemID, &f.Filename, &f.ContentType, &f.Size, &f.ObjectKey, &f.StorageBackend, &f.CreatedAt); err != nil {
 			return nil, fmt.Errorf("scanning item file: %w", err)
 		}
 		files = append(files, f)
@@ -68,10 +73,11 @@ func (r *ItemFileRepository) ListByItem(ctx context.Context, itemID string) ([]*
 func (r *ItemFileRepository) Get(ctx context.Context, id string) (*ItemFile, error) {
 	f := &ItemFile{}
 	err := r.db.pool.QueryRow(ctx,
-		`SELECT id, item_id, filename, content_type, size, object_key, created_at
+		`SELECT id, item_id, filename, content_type, size, object_key,
+		        COALESCE(storage_backend, 'filesystem'), created_at
 		 FROM item_files WHERE id = $1`,
 		id,
-	).Scan(&f.ID, &f.ItemID, &f.Filename, &f.ContentType, &f.Size, &f.ObjectKey, &f.CreatedAt)
+	).Scan(&f.ID, &f.ItemID, &f.Filename, &f.ContentType, &f.Size, &f.ObjectKey, &f.StorageBackend, &f.CreatedAt)
 	if err != nil {
 		return nil, fmt.Errorf("getting item file: %w", err)
 	}

internal/db/item_macros.go

@@ -0,0 +1,93 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// ItemMacro represents a row in the item_macros table.
+type ItemMacro struct {
+	ID             string
+	ItemID         string
+	Filename       string
+	Trigger        string
+	Content        string
+	RevisionNumber int
+	CreatedAt      time.Time
+}
+
+// ItemMacroRepository provides item_macros database operations.
+type ItemMacroRepository struct {
+	db *DB
+}
+
+// NewItemMacroRepository creates a new item macro repository.
+func NewItemMacroRepository(db *DB) *ItemMacroRepository {
+	return &ItemMacroRepository{db: db}
+}
+
+// ReplaceForItem atomically replaces all macros for an item.
+// Deletes existing rows and inserts the new set.
+func (r *ItemMacroRepository) ReplaceForItem(ctx context.Context, itemID string, revisionNumber int, macros []*ItemMacro) error {
+	return r.db.Tx(ctx, func(tx pgx.Tx) error {
+		_, err := tx.Exec(ctx, `DELETE FROM item_macros WHERE item_id = $1`, itemID)
+		if err != nil {
+			return fmt.Errorf("deleting old macros: %w", err)
+		}
+
+		for _, m := range macros {
+			_, err := tx.Exec(ctx, `
+				INSERT INTO item_macros (item_id, filename, trigger, content, revision_number)
+				VALUES ($1, $2, $3, $4, $5)
+			`, itemID, m.Filename, m.Trigger, m.Content, revisionNumber)
+			if err != nil {
+				return fmt.Errorf("inserting macro %s: %w", m.Filename, err)
+			}
+		}
+		return nil
+	})
+}
+
+// ListByItem returns all macros for an item (without content), ordered by filename.
+func (r *ItemMacroRepository) ListByItem(ctx context.Context, itemID string) ([]*ItemMacro, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, item_id, filename, trigger, revision_number, created_at
+		FROM item_macros
+		WHERE item_id = $1
+		ORDER BY filename
+	`, itemID)
+	if err != nil {
+		return nil, fmt.Errorf("listing macros: %w", err)
+	}
+	defer rows.Close()
+
+	var macros []*ItemMacro
+	for rows.Next() {
+		m := &ItemMacro{}
+		if err := rows.Scan(&m.ID, &m.ItemID, &m.Filename, &m.Trigger, &m.RevisionNumber, &m.CreatedAt); err != nil {
+			return nil, fmt.Errorf("scanning macro: %w", err)
+		}
+		macros = append(macros, m)
+	}
+	return macros, nil
+}
+
+// GetByFilename returns a single macro by item ID and filename, including content.
+func (r *ItemMacroRepository) GetByFilename(ctx context.Context, itemID string, filename string) (*ItemMacro, error) {
+	m := &ItemMacro{}
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, item_id, filename, trigger, content, revision_number, created_at
+		FROM item_macros
+		WHERE item_id = $1 AND filename = $2
+	`, itemID, filename).Scan(&m.ID, &m.ItemID, &m.Filename, &m.Trigger, &m.Content, &m.RevisionNumber, &m.CreatedAt)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("getting macro: %w", err)
+	}
+	return m, nil
+}

internal/db/item_metadata.go

@@ -0,0 +1,161 @@
+package db
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// ItemMetadata represents a row in the item_metadata table.
+type ItemMetadata struct {
+	ItemID         string
+	SchemaName     *string
+	Tags           []string
+	LifecycleState string
+	Fields         map[string]any
+	KCVersion      *string
+	ManifestUUID   *string
+	SiloInstance   *string
+	RevisionHash   *string
+	UpdatedAt      time.Time
+	UpdatedBy      *string
+}
+
+// ItemMetadataRepository provides item_metadata database operations.
+type ItemMetadataRepository struct {
+	db *DB
+}
+
+// NewItemMetadataRepository creates a new item metadata repository.
+func NewItemMetadataRepository(db *DB) *ItemMetadataRepository {
+	return &ItemMetadataRepository{db: db}
+}
+
+// Get returns metadata for an item, or nil if none exists.
+func (r *ItemMetadataRepository) Get(ctx context.Context, itemID string) (*ItemMetadata, error) {
+	m := &ItemMetadata{}
+	var fieldsJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT item_id, schema_name, tags, lifecycle_state, fields,
+		       kc_version, manifest_uuid, silo_instance, revision_hash,
+		       updated_at, updated_by
+		FROM item_metadata
+		WHERE item_id = $1
+	`, itemID).Scan(
+		&m.ItemID, &m.SchemaName, &m.Tags, &m.LifecycleState, &fieldsJSON,
+		&m.KCVersion, &m.ManifestUUID, &m.SiloInstance, &m.RevisionHash,
+		&m.UpdatedAt, &m.UpdatedBy,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("getting item metadata: %w", err)
+	}
+	if fieldsJSON != nil {
+		if err := json.Unmarshal(fieldsJSON, &m.Fields); err != nil {
+			return nil, fmt.Errorf("unmarshaling fields: %w", err)
+		}
+	}
+	if m.Fields == nil {
+		m.Fields = make(map[string]any)
+	}
+	if m.Tags == nil {
+		m.Tags = []string{}
+	}
+	return m, nil
+}
+
+// Upsert inserts or updates the metadata row for an item.
+// Used by the commit extraction pipeline.
+func (r *ItemMetadataRepository) Upsert(ctx context.Context, m *ItemMetadata) error {
+	fieldsJSON, err := json.Marshal(m.Fields)
+	if err != nil {
+		return fmt.Errorf("marshaling fields: %w", err)
+	}
+	_, err = r.db.pool.Exec(ctx, `
+		INSERT INTO item_metadata
+			(item_id, schema_name, tags, lifecycle_state, fields,
+			 kc_version, manifest_uuid, silo_instance, revision_hash,
+			 updated_at, updated_by)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, now(), $10)
+		ON CONFLICT (item_id) DO UPDATE SET
+			schema_name     = EXCLUDED.schema_name,
+			tags            = EXCLUDED.tags,
+			lifecycle_state = EXCLUDED.lifecycle_state,
+			fields          = EXCLUDED.fields,
+			kc_version      = EXCLUDED.kc_version,
+			manifest_uuid   = EXCLUDED.manifest_uuid,
+			silo_instance   = EXCLUDED.silo_instance,
+			revision_hash   = EXCLUDED.revision_hash,
+			updated_at      = now(),
+			updated_by      = EXCLUDED.updated_by
+	`, m.ItemID, m.SchemaName, m.Tags, m.LifecycleState, fieldsJSON,
+		m.KCVersion, m.ManifestUUID, m.SiloInstance, m.RevisionHash,
+		m.UpdatedBy)
+	if err != nil {
+		return fmt.Errorf("upserting item metadata: %w", err)
+	}
+	return nil
+}
+
+// UpdateFields merges the given fields into the existing JSONB fields column.
+func (r *ItemMetadataRepository) UpdateFields(ctx context.Context, itemID string, fields map[string]any, updatedBy string) error {
+	fieldsJSON, err := json.Marshal(fields)
+	if err != nil {
+		return fmt.Errorf("marshaling fields: %w", err)
+	}
+	tag, err := r.db.pool.Exec(ctx, `
+		UPDATE item_metadata
+		SET fields     = fields || $2::jsonb,
+		    updated_at = now(),
+		    updated_by = $3
+		WHERE item_id = $1
+	`, itemID, fieldsJSON, updatedBy)
+	if err != nil {
+		return fmt.Errorf("updating metadata fields: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("item metadata not found")
+	}
+	return nil
+}
+
+// UpdateLifecycle sets the lifecycle_state column.
+func (r *ItemMetadataRepository) UpdateLifecycle(ctx context.Context, itemID, state, updatedBy string) error {
+	tag, err := r.db.pool.Exec(ctx, `
+		UPDATE item_metadata
+		SET lifecycle_state = $2,
+		    updated_at      = now(),
+		    updated_by      = $3
+		WHERE item_id = $1
+	`, itemID, state, updatedBy)
+	if err != nil {
+		return fmt.Errorf("updating lifecycle state: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("item metadata not found")
+	}
+	return nil
+}
+
+// SetTags replaces the tags array.
+func (r *ItemMetadataRepository) SetTags(ctx context.Context, itemID string, tags []string, updatedBy string) error {
+	tag, err := r.db.pool.Exec(ctx, `
+		UPDATE item_metadata
+		SET tags       = $2,
+		    updated_at = now(),
+		    updated_by = $3
+		WHERE item_id = $1
+	`, itemID, tags, updatedBy)
+	if err != nil {
+		return fmt.Errorf("updating tags: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("item metadata not found")
+	}
+	return nil
+}

internal/db/items.go

@@ -26,7 +26,7 @@ type Item struct {
 	UpdatedBy       *string
 	SourcingType    string  // "manufactured" or "purchased"
 	LongDescription *string // extended description
-	ThumbnailKey    *string // MinIO key for item thumbnail
+	ThumbnailKey    *string // storage key for item thumbnail
 }
 
 // Revision represents a revision record.
@@ -39,6 +39,7 @@ type Revision struct {
 	FileVersion        *string
 	FileChecksum       *string
 	FileSize           *int64
+	FileStorageBackend string
 	ThumbnailKey       *string
 	CreatedAt          time.Time
 	CreatedBy          *string
@@ -306,16 +307,20 @@ func (r *ItemRepository) CreateRevision(ctx context.Context, rev *Revision) erro
 		return fmt.Errorf("marshaling properties: %w", err)
 	}
 
+	if rev.FileStorageBackend == "" {
+		rev.FileStorageBackend = "filesystem"
+	}
+
 	err = r.db.pool.QueryRow(ctx, `
 		INSERT INTO revisions (
 			item_id, revision_number, properties, file_key, file_version,
-			file_checksum, file_size, thumbnail_key, created_by, comment
+			file_checksum, file_size, file_storage_backend, thumbnail_key, created_by, comment
 		)
-		SELECT $1, current_revision + 1, $2, $3, $4, $5, $6, $7, $8, $9
+		SELECT $1, current_revision + 1, $2, $3, $4, $5, $6, $7, $8, $9, $10
 		FROM items WHERE id = $1
 		RETURNING id, revision_number, created_at
 	`, rev.ItemID, propsJSON, rev.FileKey, rev.FileVersion,
-		rev.FileChecksum, rev.FileSize, rev.ThumbnailKey, rev.CreatedBy, rev.Comment,
+		rev.FileChecksum, rev.FileSize, rev.FileStorageBackend, rev.ThumbnailKey, rev.CreatedBy, rev.Comment,
 	).Scan(&rev.ID, &rev.RevisionNumber, &rev.CreatedAt)
 	if err != nil {
 		return fmt.Errorf("inserting revision: %w", err)
@@ -342,7 +347,8 @@ func (r *ItemRepository) GetRevisions(ctx context.Context, itemID string) ([]*Re
 	if hasStatusColumn {
 		rows, err = r.db.pool.Query(ctx, `
 			SELECT id, item_id, revision_number, properties, file_key, file_version,
-			       file_checksum, file_size, thumbnail_key, created_at, created_by, comment,
+			       file_checksum, file_size, COALESCE(file_storage_backend, 'filesystem'),
+			       thumbnail_key, created_at, created_by, comment,
 			       COALESCE(status, 'draft') as status, COALESCE(labels, ARRAY[]::TEXT[]) as labels
 			FROM revisions
 			WHERE item_id = $1
@@ -369,7 +375,8 @@ func (r *ItemRepository) GetRevisions(ctx context.Context, itemID string) ([]*Re
 		if hasStatusColumn {
 			err = rows.Scan(
 				&rev.ID, &rev.ItemID, &rev.RevisionNumber, &propsJSON, &rev.FileKey, &rev.FileVersion,
-				&rev.FileChecksum, &rev.FileSize, &rev.ThumbnailKey, &rev.CreatedAt, &rev.CreatedBy, &rev.Comment,
+				&rev.FileChecksum, &rev.FileSize, &rev.FileStorageBackend,
+				&rev.ThumbnailKey, &rev.CreatedAt, &rev.CreatedBy, &rev.Comment,
 				&rev.Status, &rev.Labels,
 			)
 		} else {
@@ -379,6 +386,7 @@ func (r *ItemRepository) GetRevisions(ctx context.Context, itemID string) ([]*Re
 			)
 			rev.Status = "draft"
 			rev.Labels = []string{}
+			rev.FileStorageBackend = "filesystem"
 		}
 		if err != nil {
 			return nil, fmt.Errorf("scanning revision: %w", err)
@@ -412,13 +420,15 @@ func (r *ItemRepository) GetRevision(ctx context.Context, itemID string, revisio
 	if hasStatusColumn {
 		err = r.db.pool.QueryRow(ctx, `
 			SELECT id, item_id, revision_number, properties, file_key, file_version,
-			       file_checksum, file_size, thumbnail_key, created_at, created_by, comment,
+			       file_checksum, file_size, COALESCE(file_storage_backend, 'filesystem'),
+			       thumbnail_key, created_at, created_by, comment,
 			       COALESCE(status, 'draft') as status, COALESCE(labels, ARRAY[]::TEXT[]) as labels
 			FROM revisions
 			WHERE item_id = $1 AND revision_number = $2
 		`, itemID, revisionNumber).Scan(
 			&rev.ID, &rev.ItemID, &rev.RevisionNumber, &propsJSON, &rev.FileKey, &rev.FileVersion,
-			&rev.FileChecksum, &rev.FileSize, &rev.ThumbnailKey, &rev.CreatedAt, &rev.CreatedBy, &rev.Comment,
+			&rev.FileChecksum, &rev.FileSize, &rev.FileStorageBackend,
+			&rev.ThumbnailKey, &rev.CreatedAt, &rev.CreatedBy, &rev.Comment,
 			&rev.Status, &rev.Labels,
 		)
 	} else {
@@ -433,6 +443,7 @@ func (r *ItemRepository) GetRevision(ctx context.Context, itemID string, revisio
 		)
 		rev.Status = "draft"
 		rev.Labels = []string{}
+		rev.FileStorageBackend = "filesystem"
 	}
 
 	if err == pgx.ErrNoRows {
@@ -612,6 +623,7 @@ func (r *ItemRepository) CreateRevisionFromExisting(ctx context.Context, itemID
 		FileVersion:        source.FileVersion,
 		FileChecksum:       source.FileChecksum,
 		FileSize:           source.FileSize,
+		FileStorageBackend: source.FileStorageBackend,
 		ThumbnailKey:       source.ThumbnailKey,
 		CreatedBy:          createdBy,
 		Comment:            &comment,
@@ -626,13 +638,13 @@ func (r *ItemRepository) CreateRevisionFromExisting(ctx context.Context, itemID
 	err = r.db.pool.QueryRow(ctx, `
 		INSERT INTO revisions (
 			item_id, revision_number, properties, file_key, file_version,
-			file_checksum, file_size, thumbnail_key, created_by, comment, status
+			file_checksum, file_size, file_storage_backend, thumbnail_key, created_by, comment, status
 		)
-		SELECT $1, current_revision + 1, $2, $3, $4, $5, $6, $7, $8, $9, 'draft'
+		SELECT $1, current_revision + 1, $2, $3, $4, $5, $6, $7, $8, $9, $10, 'draft'
 		FROM items WHERE id = $1
 		RETURNING id, revision_number, created_at
 	`, newRev.ItemID, propsJSON, newRev.FileKey, newRev.FileVersion,
-		newRev.FileChecksum, newRev.FileSize, newRev.ThumbnailKey, newRev.CreatedBy, newRev.Comment,
+		newRev.FileChecksum, newRev.FileSize, newRev.FileStorageBackend, newRev.ThumbnailKey, newRev.CreatedBy, newRev.Comment,
 	).Scan(&newRev.ID, &newRev.RevisionNumber, &newRev.CreatedAt)
 	if err != nil {
 		return nil, fmt.Errorf("inserting revision: %w", err)

internal/db/jobs.go

@@ -0,0 +1,808 @@
+package db
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// Runner represents a registered compute worker.
+type Runner struct {
+	ID            string
+	Name          string
+	TokenHash     string
+	TokenPrefix   string
+	Tags          []string
+	Status        string
+	LastHeartbeat *time.Time
+	LastJobID     *string
+	Metadata      map[string]any
+	CreatedAt     time.Time
+	UpdatedAt     time.Time
+}
+
+// JobDefinitionRecord is a job definition stored in the database.
+type JobDefinitionRecord struct {
+	ID             string
+	Name           string
+	Version        int
+	TriggerType    string
+	ScopeType      string
+	ComputeType    string
+	RunnerTags     []string
+	TimeoutSeconds int
+	MaxRetries     int
+	Priority       int
+	Definition     map[string]any
+	Enabled        bool
+	CreatedAt      time.Time
+	UpdatedAt      time.Time
+}
+
+// Job represents a single compute job instance.
+type Job struct {
+	ID              string
+	JobDefinitionID *string
+	DefinitionName  string
+	Status          string
+	Priority        int
+	ItemID          *string
+	ProjectID       *string
+	ScopeMetadata   map[string]any
+	RunnerID        *string
+	RunnerTags      []string
+	CreatedAt       time.Time
+	ClaimedAt       *time.Time
+	StartedAt       *time.Time
+	CompletedAt     *time.Time
+	TimeoutSeconds  int
+	ExpiresAt       *time.Time
+	Progress        int
+	ProgressMessage *string
+	Result          map[string]any
+	ErrorMessage    *string
+	RetryCount      int
+	MaxRetries      int
+	CreatedBy       *string
+	CancelledBy     *string
+}
+
+// JobLogEntry is a single log line for a job.
+type JobLogEntry struct {
+	ID        string
+	JobID     string
+	Timestamp time.Time
+	Level     string
+	Message   string
+	Metadata  map[string]any
+}
+
+// JobRepository provides job and runner database operations.
+type JobRepository struct {
+	db *DB
+}
+
+// NewJobRepository creates a new job repository.
+func NewJobRepository(db *DB) *JobRepository {
+	return &JobRepository{db: db}
+}
+
+// ---------------------------------------------------------------------------
+// Job Definitions
+// ---------------------------------------------------------------------------
+
+// UpsertDefinition inserts or updates a job definition record.
+func (r *JobRepository) UpsertDefinition(ctx context.Context, d *JobDefinitionRecord) error {
+	defJSON, err := json.Marshal(d.Definition)
+	if err != nil {
+		return fmt.Errorf("marshaling definition: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO job_definitions (name, version, trigger_type, scope_type, compute_type,
+		                             runner_tags, timeout_seconds, max_retries, priority,
+		                             definition, enabled)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+		ON CONFLICT (name) DO UPDATE SET
+			version = EXCLUDED.version,
+			trigger_type = EXCLUDED.trigger_type,
+			scope_type = EXCLUDED.scope_type,
+			compute_type = EXCLUDED.compute_type,
+			runner_tags = EXCLUDED.runner_tags,
+			timeout_seconds = EXCLUDED.timeout_seconds,
+			max_retries = EXCLUDED.max_retries,
+			priority = EXCLUDED.priority,
+			definition = EXCLUDED.definition,
+			enabled = EXCLUDED.enabled,
+			updated_at = now()
+		RETURNING id, created_at, updated_at
+	`, d.Name, d.Version, d.TriggerType, d.ScopeType, d.ComputeType,
+		d.RunnerTags, d.TimeoutSeconds, d.MaxRetries, d.Priority,
+		defJSON, d.Enabled,
+	).Scan(&d.ID, &d.CreatedAt, &d.UpdatedAt)
+	if err != nil {
+		return fmt.Errorf("upserting job definition: %w", err)
+	}
+	return nil
+}
+
+// GetDefinition returns a job definition by name.
+func (r *JobRepository) GetDefinition(ctx context.Context, name string) (*JobDefinitionRecord, error) {
+	d := &JobDefinitionRecord{}
+	var defJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, name, version, trigger_type, scope_type, compute_type,
+		       runner_tags, timeout_seconds, max_retries, priority,
+		       definition, enabled, created_at, updated_at
+		FROM job_definitions WHERE name = $1
+	`, name).Scan(
+		&d.ID, &d.Name, &d.Version, &d.TriggerType, &d.ScopeType, &d.ComputeType,
+		&d.RunnerTags, &d.TimeoutSeconds, &d.MaxRetries, &d.Priority,
+		&defJSON, &d.Enabled, &d.CreatedAt, &d.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying job definition: %w", err)
+	}
+	if defJSON != nil {
+		if err := json.Unmarshal(defJSON, &d.Definition); err != nil {
+			return nil, fmt.Errorf("unmarshaling definition: %w", err)
+		}
+	}
+	return d, nil
+}
+
+// ListDefinitions returns all job definitions.
+func (r *JobRepository) ListDefinitions(ctx context.Context) ([]*JobDefinitionRecord, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, name, version, trigger_type, scope_type, compute_type,
+		       runner_tags, timeout_seconds, max_retries, priority,
+		       definition, enabled, created_at, updated_at
+		FROM job_definitions ORDER BY name
+	`)
+	if err != nil {
+		return nil, fmt.Errorf("querying job definitions: %w", err)
+	}
+	defer rows.Close()
+	return scanJobDefinitions(rows)
+}
+
+// GetDefinitionsByTrigger returns all enabled definitions matching a trigger type.
+func (r *JobRepository) GetDefinitionsByTrigger(ctx context.Context, triggerType string) ([]*JobDefinitionRecord, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, name, version, trigger_type, scope_type, compute_type,
+		       runner_tags, timeout_seconds, max_retries, priority,
+		       definition, enabled, created_at, updated_at
+		FROM job_definitions
+		WHERE trigger_type = $1 AND enabled = true
+		ORDER BY priority ASC, name
+	`, triggerType)
+	if err != nil {
+		return nil, fmt.Errorf("querying definitions by trigger: %w", err)
+	}
+	defer rows.Close()
+	return scanJobDefinitions(rows)
+}
+
+// GetDefinitionByID returns a job definition by ID.
+func (r *JobRepository) GetDefinitionByID(ctx context.Context, id string) (*JobDefinitionRecord, error) {
+	d := &JobDefinitionRecord{}
+	var defJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, name, version, trigger_type, scope_type, compute_type,
+		       runner_tags, timeout_seconds, max_retries, priority,
+		       definition, enabled, created_at, updated_at
+		FROM job_definitions WHERE id = $1
+	`, id).Scan(
+		&d.ID, &d.Name, &d.Version, &d.TriggerType, &d.ScopeType, &d.ComputeType,
+		&d.RunnerTags, &d.TimeoutSeconds, &d.MaxRetries, &d.Priority,
+		&defJSON, &d.Enabled, &d.CreatedAt, &d.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying job definition by ID: %w", err)
+	}
+	if defJSON != nil {
+		if err := json.Unmarshal(defJSON, &d.Definition); err != nil {
+			return nil, fmt.Errorf("unmarshaling definition: %w", err)
+		}
+	}
+	return d, nil
+}
+
+// ---------------------------------------------------------------------------
+// Jobs
+// ---------------------------------------------------------------------------
+
+// CreateJob inserts a new job.
+func (r *JobRepository) CreateJob(ctx context.Context, j *Job) error {
+	scopeJSON, err := json.Marshal(j.ScopeMetadata)
+	if err != nil {
+		return fmt.Errorf("marshaling scope metadata: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO jobs (job_definition_id, definition_name, status, priority,
+		                  item_id, project_id, scope_metadata,
+		                  runner_tags, timeout_seconds, max_retries, created_by)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+		RETURNING id, created_at
+	`, j.JobDefinitionID, j.DefinitionName, "pending", j.Priority,
+		j.ItemID, j.ProjectID, scopeJSON,
+		j.RunnerTags, j.TimeoutSeconds, j.MaxRetries, j.CreatedBy,
+	).Scan(&j.ID, &j.CreatedAt)
+	if err != nil {
+		return fmt.Errorf("creating job: %w", err)
+	}
+	j.Status = "pending"
+	return nil
+}
+
+// GetJob returns a job by ID.
+func (r *JobRepository) GetJob(ctx context.Context, jobID string) (*Job, error) {
+	j := &Job{}
+	var scopeJSON, resultJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, job_definition_id, definition_name, status, priority,
+		       item_id, project_id, scope_metadata, runner_id, runner_tags,
+		       created_at, claimed_at, started_at, completed_at,
+		       timeout_seconds, expires_at, progress, progress_message,
+		       result, error_message, retry_count, max_retries,
+		       created_by, cancelled_by
+		FROM jobs WHERE id = $1
+	`, jobID).Scan(
+		&j.ID, &j.JobDefinitionID, &j.DefinitionName, &j.Status, &j.Priority,
+		&j.ItemID, &j.ProjectID, &scopeJSON, &j.RunnerID, &j.RunnerTags,
+		&j.CreatedAt, &j.ClaimedAt, &j.StartedAt, &j.CompletedAt,
+		&j.TimeoutSeconds, &j.ExpiresAt, &j.Progress, &j.ProgressMessage,
+		&resultJSON, &j.ErrorMessage, &j.RetryCount, &j.MaxRetries,
+		&j.CreatedBy, &j.CancelledBy,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying job: %w", err)
+	}
+	if scopeJSON != nil {
+		if err := json.Unmarshal(scopeJSON, &j.ScopeMetadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling scope metadata: %w", err)
+		}
+	}
+	if resultJSON != nil {
+		if err := json.Unmarshal(resultJSON, &j.Result); err != nil {
+			return nil, fmt.Errorf("unmarshaling result: %w", err)
+		}
+	}
+	return j, nil
+}
+
+// ListJobs returns jobs matching optional filters.
+func (r *JobRepository) ListJobs(ctx context.Context, status, itemID string, limit, offset int) ([]*Job, error) {
+	query := `
+		SELECT id, job_definition_id, definition_name, status, priority,
+		       item_id, project_id, scope_metadata, runner_id, runner_tags,
+		       created_at, claimed_at, started_at, completed_at,
+		       timeout_seconds, expires_at, progress, progress_message,
+		       result, error_message, retry_count, max_retries,
+		       created_by, cancelled_by
+		FROM jobs WHERE 1=1`
+	args := []any{}
+	argN := 1
+
+	if status != "" {
+		query += fmt.Sprintf(" AND status = $%d", argN)
+		args = append(args, status)
+		argN++
+	}
+	if itemID != "" {
+		query += fmt.Sprintf(" AND item_id = $%d", argN)
+		args = append(args, itemID)
+		argN++
+	}
+
+	query += " ORDER BY created_at DESC"
+
+	if limit > 0 {
+		query += fmt.Sprintf(" LIMIT $%d", argN)
+		args = append(args, limit)
+		argN++
+	}
+	if offset > 0 {
+		query += fmt.Sprintf(" OFFSET $%d", argN)
+		args = append(args, offset)
+	}
+
+	rows, err := r.db.pool.Query(ctx, query, args...)
+	if err != nil {
+		return nil, fmt.Errorf("querying jobs: %w", err)
+	}
+	defer rows.Close()
+	return scanJobs(rows)
+}
+
+// ListSolverJobs returns solver jobs (definition_name LIKE 'assembly-%') with optional filters.
+func (r *JobRepository) ListSolverJobs(ctx context.Context, status, itemID, operation string, limit, offset int) ([]*Job, error) {
+	query := `
+		SELECT id, job_definition_id, definition_name, status, priority,
+		       item_id, project_id, scope_metadata, runner_id, runner_tags,
+		       created_at, claimed_at, started_at, completed_at,
+		       timeout_seconds, expires_at, progress, progress_message,
+		       result, error_message, retry_count, max_retries,
+		       created_by, cancelled_by
+		FROM jobs WHERE definition_name LIKE 'assembly-%'`
+	args := []any{}
+	argN := 1
+
+	if status != "" {
+		query += fmt.Sprintf(" AND status = $%d", argN)
+		args = append(args, status)
+		argN++
+	}
+	if itemID != "" {
+		query += fmt.Sprintf(" AND item_id = $%d", argN)
+		args = append(args, itemID)
+		argN++
+	}
+	if operation != "" {
+		query += fmt.Sprintf(" AND scope_metadata->>'operation' = $%d", argN)
+		args = append(args, operation)
+		argN++
+	}
+
+	query += " ORDER BY created_at DESC"
+
+	if limit > 0 {
+		query += fmt.Sprintf(" LIMIT $%d", argN)
+		args = append(args, limit)
+		argN++
+	}
+	if offset > 0 {
+		query += fmt.Sprintf(" OFFSET $%d", argN)
+		args = append(args, offset)
+	}
+
+	rows, err := r.db.pool.Query(ctx, query, args...)
+	if err != nil {
+		return nil, fmt.Errorf("querying solver jobs: %w", err)
+	}
+	defer rows.Close()
+	return scanJobs(rows)
+}
+
+// ClaimJob atomically claims the next available job matching the runner's tags.
+// Uses SELECT FOR UPDATE SKIP LOCKED for exactly-once delivery.
+func (r *JobRepository) ClaimJob(ctx context.Context, runnerID string, tags []string) (*Job, error) {
+	j := &Job{}
+	var scopeJSON, resultJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		WITH claimable AS (
+			SELECT id FROM jobs
+			WHERE status = 'pending' AND runner_tags <@ $2::text[]
+			ORDER BY priority ASC, created_at ASC
+			LIMIT 1
+			FOR UPDATE SKIP LOCKED
+		)
+		UPDATE jobs SET
+			status = 'claimed',
+			runner_id = $1,
+			claimed_at = now(),
+			expires_at = now() + (timeout_seconds || ' seconds')::interval
+		FROM claimable
+		WHERE jobs.id = claimable.id
+		RETURNING jobs.id, jobs.job_definition_id, jobs.definition_name, jobs.status,
+		          jobs.priority, jobs.item_id, jobs.project_id, jobs.scope_metadata,
+		          jobs.runner_id, jobs.runner_tags, jobs.created_at, jobs.claimed_at,
+		          jobs.started_at, jobs.completed_at, jobs.timeout_seconds, jobs.expires_at,
+		          jobs.progress, jobs.progress_message, jobs.result, jobs.error_message,
+		          jobs.retry_count, jobs.max_retries, jobs.created_by, jobs.cancelled_by
+	`, runnerID, tags).Scan(
+		&j.ID, &j.JobDefinitionID, &j.DefinitionName, &j.Status,
+		&j.Priority, &j.ItemID, &j.ProjectID, &scopeJSON,
+		&j.RunnerID, &j.RunnerTags, &j.CreatedAt, &j.ClaimedAt,
+		&j.StartedAt, &j.CompletedAt, &j.TimeoutSeconds, &j.ExpiresAt,
+		&j.Progress, &j.ProgressMessage, &resultJSON, &j.ErrorMessage,
+		&j.RetryCount, &j.MaxRetries, &j.CreatedBy, &j.CancelledBy,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("claiming job: %w", err)
+	}
+	if scopeJSON != nil {
+		if err := json.Unmarshal(scopeJSON, &j.ScopeMetadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling scope metadata: %w", err)
+		}
+	}
+	if resultJSON != nil {
+		if err := json.Unmarshal(resultJSON, &j.Result); err != nil {
+			return nil, fmt.Errorf("unmarshaling result: %w", err)
+		}
+	}
+	return j, nil
+}
+
+// StartJob transitions a claimed job to running.
+func (r *JobRepository) StartJob(ctx context.Context, jobID, runnerID string) error {
+	result, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET status = 'running', started_at = now()
+		WHERE id = $1 AND runner_id = $2 AND status = 'claimed'
+	`, jobID, runnerID)
+	if err != nil {
+		return fmt.Errorf("starting job: %w", err)
+	}
+	if result.RowsAffected() == 0 {
+		return fmt.Errorf("job %s not claimable by runner %s or not in claimed state", jobID, runnerID)
+	}
+	return nil
+}
+
+// UpdateProgress updates a running job's progress.
+func (r *JobRepository) UpdateProgress(ctx context.Context, jobID, runnerID string, progress int, message string) error {
+	var msg *string
+	if message != "" {
+		msg = &message
+	}
+	result, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET progress = $3, progress_message = $4
+		WHERE id = $1 AND runner_id = $2 AND status IN ('claimed', 'running')
+	`, jobID, runnerID, progress, msg)
+	if err != nil {
+		return fmt.Errorf("updating progress: %w", err)
+	}
+	if result.RowsAffected() == 0 {
+		return fmt.Errorf("job %s not owned by runner %s or not active", jobID, runnerID)
+	}
+	return nil
+}
+
+// CompleteJob marks a job as completed with optional result data.
+func (r *JobRepository) CompleteJob(ctx context.Context, jobID, runnerID string, resultData map[string]any) error {
+	var resultJSON []byte
+	var err error
+	if resultData != nil {
+		resultJSON, err = json.Marshal(resultData)
+		if err != nil {
+			return fmt.Errorf("marshaling result: %w", err)
+		}
+	}
+
+	res, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET
+			status = 'completed',
+			progress = 100,
+			result = $3,
+			completed_at = now()
+		WHERE id = $1 AND runner_id = $2 AND status IN ('claimed', 'running')
+	`, jobID, runnerID, resultJSON)
+	if err != nil {
+		return fmt.Errorf("completing job: %w", err)
+	}
+	if res.RowsAffected() == 0 {
+		return fmt.Errorf("job %s not owned by runner %s or not active", jobID, runnerID)
+	}
+	return nil
+}
+
+// FailJob marks a job as failed with an error message.
+func (r *JobRepository) FailJob(ctx context.Context, jobID, runnerID string, errMsg string) error {
+	res, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET
+			status = 'failed',
+			error_message = $3,
+			completed_at = now()
+		WHERE id = $1 AND runner_id = $2 AND status IN ('claimed', 'running')
+	`, jobID, runnerID, errMsg)
+	if err != nil {
+		return fmt.Errorf("failing job: %w", err)
+	}
+	if res.RowsAffected() == 0 {
+		return fmt.Errorf("job %s not owned by runner %s or not active", jobID, runnerID)
+	}
+	return nil
+}
+
+// CancelJob cancels a pending or active job.
+func (r *JobRepository) CancelJob(ctx context.Context, jobID string, cancelledBy string) error {
+	res, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET
+			status = 'cancelled',
+			cancelled_by = $2,
+			completed_at = now()
+		WHERE id = $1 AND status IN ('pending', 'claimed', 'running')
+	`, jobID, cancelledBy)
+	if err != nil {
+		return fmt.Errorf("cancelling job: %w", err)
+	}
+	if res.RowsAffected() == 0 {
+		return fmt.Errorf("job %s not cancellable", jobID)
+	}
+	return nil
+}
+
+// TimeoutExpiredJobs marks expired claimed/running jobs as failed.
+// Returns the number of jobs timed out.
+func (r *JobRepository) TimeoutExpiredJobs(ctx context.Context) (int64, error) {
+	result, err := r.db.pool.Exec(ctx, `
+		UPDATE jobs SET
+			status = 'failed',
+			error_message = 'job timed out',
+			completed_at = now()
+		WHERE status IN ('claimed', 'running')
+		  AND expires_at IS NOT NULL
+		  AND expires_at < now()
+	`)
+	if err != nil {
+		return 0, fmt.Errorf("timing out expired jobs: %w", err)
+	}
+	return result.RowsAffected(), nil
+}
+
+// ---------------------------------------------------------------------------
+// Job Log
+// ---------------------------------------------------------------------------
+
+// AppendLog adds a log entry to a job.
+func (r *JobRepository) AppendLog(ctx context.Context, entry *JobLogEntry) error {
+	metaJSON, err := json.Marshal(entry.Metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling log metadata: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO job_log (job_id, level, message, metadata)
+		VALUES ($1, $2, $3, $4)
+		RETURNING id, timestamp
+	`, entry.JobID, entry.Level, entry.Message, metaJSON,
+	).Scan(&entry.ID, &entry.Timestamp)
+	if err != nil {
+		return fmt.Errorf("appending job log: %w", err)
+	}
+	return nil
+}
+
+// GetJobLogs returns all log entries for a job.
+func (r *JobRepository) GetJobLogs(ctx context.Context, jobID string) ([]*JobLogEntry, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, job_id, timestamp, level, message, metadata
+		FROM job_log WHERE job_id = $1 ORDER BY timestamp ASC
+	`, jobID)
+	if err != nil {
+		return nil, fmt.Errorf("querying job logs: %w", err)
+	}
+	defer rows.Close()
+
+	var entries []*JobLogEntry
+	for rows.Next() {
+		e := &JobLogEntry{}
+		var metaJSON []byte
+		if err := rows.Scan(&e.ID, &e.JobID, &e.Timestamp, &e.Level, &e.Message, &metaJSON); err != nil {
+			return nil, fmt.Errorf("scanning job log: %w", err)
+		}
+		if metaJSON != nil {
+			if err := json.Unmarshal(metaJSON, &e.Metadata); err != nil {
+				return nil, fmt.Errorf("unmarshaling log metadata: %w", err)
+			}
+		}
+		entries = append(entries, e)
+	}
+	return entries, rows.Err()
+}
+
+// ---------------------------------------------------------------------------
+// Runners
+// ---------------------------------------------------------------------------
+
+// RegisterRunner creates a new runner record.
+func (r *JobRepository) RegisterRunner(ctx context.Context, runner *Runner) error {
+	metaJSON, err := json.Marshal(runner.Metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling runner metadata: %w", err)
+	}
+
+	err = r.db.pool.QueryRow(ctx, `
+		INSERT INTO runners (name, token_hash, token_prefix, tags, status, metadata)
+		VALUES ($1, $2, $3, $4, 'offline', $5)
+		RETURNING id, created_at, updated_at
+	`, runner.Name, runner.TokenHash, runner.TokenPrefix, runner.Tags, metaJSON,
+	).Scan(&runner.ID, &runner.CreatedAt, &runner.UpdatedAt)
+	if err != nil {
+		return fmt.Errorf("registering runner: %w", err)
+	}
+	runner.Status = "offline"
+	return nil
+}
+
+// GetRunnerByToken looks up a runner by token hash.
+func (r *JobRepository) GetRunnerByToken(ctx context.Context, tokenHash string) (*Runner, error) {
+	runner := &Runner{}
+	var metaJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, name, token_hash, token_prefix, tags, status,
+		       last_heartbeat, last_job_id, metadata, created_at, updated_at
+		FROM runners WHERE token_hash = $1
+	`, tokenHash).Scan(
+		&runner.ID, &runner.Name, &runner.TokenHash, &runner.TokenPrefix,
+		&runner.Tags, &runner.Status, &runner.LastHeartbeat, &runner.LastJobID,
+		&metaJSON, &runner.CreatedAt, &runner.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying runner by token: %w", err)
+	}
+	if metaJSON != nil {
+		if err := json.Unmarshal(metaJSON, &runner.Metadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling runner metadata: %w", err)
+		}
+	}
+	return runner, nil
+}
+
+// GetRunner returns a runner by ID.
+func (r *JobRepository) GetRunner(ctx context.Context, runnerID string) (*Runner, error) {
+	runner := &Runner{}
+	var metaJSON []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, name, token_hash, token_prefix, tags, status,
+		       last_heartbeat, last_job_id, metadata, created_at, updated_at
+		FROM runners WHERE id = $1
+	`, runnerID).Scan(
+		&runner.ID, &runner.Name, &runner.TokenHash, &runner.TokenPrefix,
+		&runner.Tags, &runner.Status, &runner.LastHeartbeat, &runner.LastJobID,
+		&metaJSON, &runner.CreatedAt, &runner.UpdatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("querying runner: %w", err)
+	}
+	if metaJSON != nil {
+		if err := json.Unmarshal(metaJSON, &runner.Metadata); err != nil {
+			return nil, fmt.Errorf("unmarshaling runner metadata: %w", err)
+		}
+	}
+	return runner, nil
+}
+
+// Heartbeat updates a runner's heartbeat timestamp and sets status to online.
+func (r *JobRepository) Heartbeat(ctx context.Context, runnerID string) error {
+	res, err := r.db.pool.Exec(ctx, `
+		UPDATE runners SET
+			status = 'online',
+			last_heartbeat = now(),
+			updated_at = now()
+		WHERE id = $1
+	`, runnerID)
+	if err != nil {
+		return fmt.Errorf("updating heartbeat: %w", err)
+	}
+	if res.RowsAffected() == 0 {
+		return fmt.Errorf("runner %s not found", runnerID)
+	}
+	return nil
+}
+
+// ListRunners returns all registered runners.
+func (r *JobRepository) ListRunners(ctx context.Context) ([]*Runner, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, name, token_hash, token_prefix, tags, status,
+		       last_heartbeat, last_job_id, metadata, created_at, updated_at
+		FROM runners ORDER BY name
+	`)
+	if err != nil {
+		return nil, fmt.Errorf("querying runners: %w", err)
+	}
+	defer rows.Close()
+
+	var runners []*Runner
+	for rows.Next() {
+		runner := &Runner{}
+		var metaJSON []byte
+		if err := rows.Scan(
+			&runner.ID, &runner.Name, &runner.TokenHash, &runner.TokenPrefix,
+			&runner.Tags, &runner.Status, &runner.LastHeartbeat, &runner.LastJobID,
+			&metaJSON, &runner.CreatedAt, &runner.UpdatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scanning runner: %w", err)
+		}
+		if metaJSON != nil {
+			if err := json.Unmarshal(metaJSON, &runner.Metadata); err != nil {
+				return nil, fmt.Errorf("unmarshaling runner metadata: %w", err)
+			}
+		}
+		runners = append(runners, runner)
+	}
+	return runners, rows.Err()
+}
+
+// DeleteRunner removes a runner by ID.
+func (r *JobRepository) DeleteRunner(ctx context.Context, runnerID string) error {
+	res, err := r.db.pool.Exec(ctx, `DELETE FROM runners WHERE id = $1`, runnerID)
+	if err != nil {
+		return fmt.Errorf("deleting runner: %w", err)
+	}
+	if res.RowsAffected() == 0 {
+		return fmt.Errorf("runner %s not found", runnerID)
+	}
+	return nil
+}
+
+// ExpireStaleRunners marks runners with no recent heartbeat as offline.
+func (r *JobRepository) ExpireStaleRunners(ctx context.Context, timeout time.Duration) (int64, error) {
+	result, err := r.db.pool.Exec(ctx, `
+		UPDATE runners SET status = 'offline', updated_at = now()
+		WHERE status = 'online'
+		  AND last_heartbeat < now() - $1::interval
+	`, timeout.String())
+	if err != nil {
+		return 0, fmt.Errorf("expiring stale runners: %w", err)
+	}
+	return result.RowsAffected(), nil
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+func scanJobDefinitions(rows pgx.Rows) ([]*JobDefinitionRecord, error) {
+	var defs []*JobDefinitionRecord
+	for rows.Next() {
+		d := &JobDefinitionRecord{}
+		var defJSON []byte
+		if err := rows.Scan(
+			&d.ID, &d.Name, &d.Version, &d.TriggerType, &d.ScopeType, &d.ComputeType,
+			&d.RunnerTags, &d.TimeoutSeconds, &d.MaxRetries, &d.Priority,
+			&defJSON, &d.Enabled, &d.CreatedAt, &d.UpdatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scanning job definition: %w", err)
+		}
+		if defJSON != nil {
+			if err := json.Unmarshal(defJSON, &d.Definition); err != nil {
+				return nil, fmt.Errorf("unmarshaling definition: %w", err)
+			}
+		}
+		defs = append(defs, d)
+	}
+	return defs, rows.Err()
+}
+
+func scanJobs(rows pgx.Rows) ([]*Job, error) {
+	var jobs []*Job
+	for rows.Next() {
+		j := &Job{}
+		var scopeJSON, resultJSON []byte
+		if err := rows.Scan(
+			&j.ID, &j.JobDefinitionID, &j.DefinitionName, &j.Status, &j.Priority,
+			&j.ItemID, &j.ProjectID, &scopeJSON, &j.RunnerID, &j.RunnerTags,
+			&j.CreatedAt, &j.ClaimedAt, &j.StartedAt, &j.CompletedAt,
+			&j.TimeoutSeconds, &j.ExpiresAt, &j.Progress, &j.ProgressMessage,
+			&resultJSON, &j.ErrorMessage, &j.RetryCount, &j.MaxRetries,
+			&j.CreatedBy, &j.CancelledBy,
+		); err != nil {
+			return nil, fmt.Errorf("scanning job: %w", err)
+		}
+		if scopeJSON != nil {
+			if err := json.Unmarshal(scopeJSON, &j.ScopeMetadata); err != nil {
+				return nil, fmt.Errorf("unmarshaling scope metadata: %w", err)
+			}
+		}
+		if resultJSON != nil {
+			if err := json.Unmarshal(resultJSON, &j.Result); err != nil {
+				return nil, fmt.Errorf("unmarshaling result: %w", err)
+			}
+		}
+		jobs = append(jobs, j)
+	}
+	return jobs, rows.Err()
+}

internal/db/locations.go

@@ -0,0 +1,230 @@
+package db
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// Location represents a location in the hierarchy.
+type Location struct {
+	ID           string
+	Path         string
+	Name         string
+	ParentID     *string
+	LocationType string
+	Depth        int
+	Metadata     map[string]any
+	CreatedAt    time.Time
+}
+
+// LocationRepository provides location database operations.
+type LocationRepository struct {
+	db *DB
+}
+
+// NewLocationRepository creates a new location repository.
+func NewLocationRepository(db *DB) *LocationRepository {
+	return &LocationRepository{db: db}
+}
+
+// List returns all locations ordered by path.
+func (r *LocationRepository) List(ctx context.Context) ([]*Location, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, path, name, parent_id, location_type, depth, metadata, created_at
+		FROM locations
+		ORDER BY path
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanLocations(rows)
+}
+
+// GetByPath returns a location by its path.
+func (r *LocationRepository) GetByPath(ctx context.Context, path string) (*Location, error) {
+	loc := &Location{}
+	var meta []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, path, name, parent_id, location_type, depth, metadata, created_at
+		FROM locations
+		WHERE path = $1
+	`, path).Scan(&loc.ID, &loc.Path, &loc.Name, &loc.ParentID, &loc.LocationType, &loc.Depth, &meta, &loc.CreatedAt)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if meta != nil {
+		json.Unmarshal(meta, &loc.Metadata)
+	}
+	return loc, nil
+}
+
+// GetByID returns a location by its ID.
+func (r *LocationRepository) GetByID(ctx context.Context, id string) (*Location, error) {
+	loc := &Location{}
+	var meta []byte
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, path, name, parent_id, location_type, depth, metadata, created_at
+		FROM locations
+		WHERE id = $1
+	`, id).Scan(&loc.ID, &loc.Path, &loc.Name, &loc.ParentID, &loc.LocationType, &loc.Depth, &meta, &loc.CreatedAt)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if meta != nil {
+		json.Unmarshal(meta, &loc.Metadata)
+	}
+	return loc, nil
+}
+
+// GetChildren returns direct children of a location.
+func (r *LocationRepository) GetChildren(ctx context.Context, parentID string) ([]*Location, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, path, name, parent_id, location_type, depth, metadata, created_at
+		FROM locations
+		WHERE parent_id = $1
+		ORDER BY path
+	`, parentID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanLocations(rows)
+}
+
+// GetTree returns a location and all its descendants (by path prefix).
+func (r *LocationRepository) GetTree(ctx context.Context, rootPath string) ([]*Location, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, path, name, parent_id, location_type, depth, metadata, created_at
+		FROM locations
+		WHERE path = $1 OR path LIKE $2
+		ORDER BY path
+	`, rootPath, rootPath+"/%")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanLocations(rows)
+}
+
+// Create inserts a new location. ParentID and Depth are resolved from the path.
+func (r *LocationRepository) Create(ctx context.Context, loc *Location) error {
+	// Auto-calculate depth from path segments
+	loc.Depth = strings.Count(loc.Path, "/")
+
+	// Resolve parent_id from path if not explicitly set
+	if loc.ParentID == nil && loc.Depth > 0 {
+		parentPath := loc.Path[:strings.LastIndex(loc.Path, "/")]
+		parent, err := r.GetByPath(ctx, parentPath)
+		if err != nil {
+			return fmt.Errorf("looking up parent %q: %w", parentPath, err)
+		}
+		if parent == nil {
+			return fmt.Errorf("parent location %q does not exist", parentPath)
+		}
+		loc.ParentID = &parent.ID
+	}
+
+	meta, err := json.Marshal(loc.Metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling metadata: %w", err)
+	}
+
+	return r.db.pool.QueryRow(ctx, `
+		INSERT INTO locations (path, name, parent_id, location_type, depth, metadata)
+		VALUES ($1, $2, $3, $4, $5, $6)
+		RETURNING id, created_at
+	`, loc.Path, loc.Name, loc.ParentID, loc.LocationType, loc.Depth, meta).Scan(&loc.ID, &loc.CreatedAt)
+}
+
+// Update updates a location's name, type, and metadata.
+func (r *LocationRepository) Update(ctx context.Context, path string, name, locationType string, metadata map[string]any) error {
+	meta, err := json.Marshal(metadata)
+	if err != nil {
+		return fmt.Errorf("marshaling metadata: %w", err)
+	}
+	tag, err := r.db.pool.Exec(ctx, `
+		UPDATE locations
+		SET name = $2, location_type = $3, metadata = $4
+		WHERE path = $1
+	`, path, name, locationType, meta)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("location %q not found", path)
+	}
+	return nil
+}
+
+// Delete removes a location. Returns an error if inventory rows reference it.
+func (r *LocationRepository) Delete(ctx context.Context, path string) error {
+	// Check for inventory references
+	var count int
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT COUNT(*) FROM inventory
+		WHERE location_id = (SELECT id FROM locations WHERE path = $1)
+	`, path).Scan(&count)
+	if err != nil {
+		return err
+	}
+	if count > 0 {
+		return fmt.Errorf("cannot delete location %q: %d inventory record(s) exist", path, count)
+	}
+
+	// Delete children first (cascade by path prefix), deepest first
+	_, err = r.db.pool.Exec(ctx, `
+		DELETE FROM locations
+		WHERE path LIKE $1
+	`, path+"/%")
+	if err != nil {
+		return err
+	}
+
+	tag, err := r.db.pool.Exec(ctx, `DELETE FROM locations WHERE path = $1`, path)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("location %q not found", path)
+	}
+	return nil
+}
+
+// HasInventory checks if a location (or descendants) have inventory records.
+func (r *LocationRepository) HasInventory(ctx context.Context, path string) (bool, error) {
+	var count int
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT COUNT(*) FROM inventory i
+		JOIN locations l ON l.id = i.location_id
+		WHERE l.path = $1 OR l.path LIKE $2
+	`, path, path+"/%").Scan(&count)
+	return count > 0, err
+}
+
+func scanLocations(rows pgx.Rows) ([]*Location, error) {
+	var locs []*Location
+	for rows.Next() {
+		loc := &Location{}
+		var meta []byte
+		if err := rows.Scan(&loc.ID, &loc.Path, &loc.Name, &loc.ParentID, &loc.LocationType, &loc.Depth, &meta, &loc.CreatedAt); err != nil {
+			return nil, err
+		}
+		if meta != nil {
+			json.Unmarshal(meta, &loc.Metadata)
+		}
+		locs = append(locs, loc)
+	}
+	return locs, rows.Err()
+}

internal/db/migrations/022_workstations.sql

@@ -0,0 +1,11 @@
+-- 022_workstations.sql — workstation identity for edit sessions
+
+CREATE TABLE workstations (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name        TEXT NOT NULL,
+    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    hostname    TEXT NOT NULL DEFAULT '',
+    last_seen   TIMESTAMPTZ NOT NULL DEFAULT now(),
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE(user_id, name)
+);

internal/db/settings.go

@@ -0,0 +1,105 @@
+package db
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+)
+
+// SettingsRepository provides access to module_state and settings_overrides tables.
+type SettingsRepository struct {
+	db *DB
+}
+
+// NewSettingsRepository creates a new SettingsRepository.
+func NewSettingsRepository(db *DB) *SettingsRepository {
+	return &SettingsRepository{db: db}
+}
+
+// GetModuleStates returns all module enabled/disabled states from the database.
+func (r *SettingsRepository) GetModuleStates(ctx context.Context) (map[string]bool, error) {
+	rows, err := r.db.pool.Query(ctx,
+		`SELECT module_id, enabled FROM module_state`)
+	if err != nil {
+		return nil, fmt.Errorf("querying module states: %w", err)
+	}
+	defer rows.Close()
+
+	states := make(map[string]bool)
+	for rows.Next() {
+		var id string
+		var enabled bool
+		if err := rows.Scan(&id, &enabled); err != nil {
+			return nil, fmt.Errorf("scanning module state: %w", err)
+		}
+		states[id] = enabled
+	}
+	return states, rows.Err()
+}
+
+// SetModuleState persists a module's enabled state. Uses upsert semantics.
+func (r *SettingsRepository) SetModuleState(ctx context.Context, moduleID string, enabled bool, updatedBy string) error {
+	_, err := r.db.pool.Exec(ctx,
+		`INSERT INTO module_state (module_id, enabled, updated_by, updated_at)
+		 VALUES ($1, $2, $3, now())
+		 ON CONFLICT (module_id) DO UPDATE
+		 SET enabled = EXCLUDED.enabled,
+		     updated_by = EXCLUDED.updated_by,
+		     updated_at = now()`,
+		moduleID, enabled, updatedBy)
+	if err != nil {
+		return fmt.Errorf("setting module state: %w", err)
+	}
+	return nil
+}
+
+// GetOverrides returns all settings overrides from the database.
+func (r *SettingsRepository) GetOverrides(ctx context.Context) (map[string]json.RawMessage, error) {
+	rows, err := r.db.pool.Query(ctx,
+		`SELECT key, value FROM settings_overrides`)
+	if err != nil {
+		return nil, fmt.Errorf("querying settings overrides: %w", err)
+	}
+	defer rows.Close()
+
+	overrides := make(map[string]json.RawMessage)
+	for rows.Next() {
+		var key string
+		var value json.RawMessage
+		if err := rows.Scan(&key, &value); err != nil {
+			return nil, fmt.Errorf("scanning settings override: %w", err)
+		}
+		overrides[key] = value
+	}
+	return overrides, rows.Err()
+}
+
+// SetOverride persists a settings override. Uses upsert semantics.
+func (r *SettingsRepository) SetOverride(ctx context.Context, key string, value any, updatedBy string) error {
+	jsonVal, err := json.Marshal(value)
+	if err != nil {
+		return fmt.Errorf("marshaling override value: %w", err)
+	}
+	_, err = r.db.pool.Exec(ctx,
+		`INSERT INTO settings_overrides (key, value, updated_by, updated_at)
+		 VALUES ($1, $2, $3, now())
+		 ON CONFLICT (key) DO UPDATE
+		 SET value = EXCLUDED.value,
+		     updated_by = EXCLUDED.updated_by,
+		     updated_at = now()`,
+		key, jsonVal, updatedBy)
+	if err != nil {
+		return fmt.Errorf("setting override: %w", err)
+	}
+	return nil
+}
+
+// DeleteOverride removes a settings override.
+func (r *SettingsRepository) DeleteOverride(ctx context.Context, key string) error {
+	_, err := r.db.pool.Exec(ctx,
+		`DELETE FROM settings_overrides WHERE key = $1`, key)
+	if err != nil {
+		return fmt.Errorf("deleting override: %w", err)
+	}
+	return nil
+}

internal/db/solver_results.go

@@ -0,0 +1,121 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// SolverResult represents a row in the solver_results table.
+type SolverResult struct {
+	ID             string
+	ItemID         string
+	RevisionNumber int
+	JobID          *string
+	Operation      string // solve, diagnose, kinematic
+	SolverName     string
+	Status         string // SolveStatus string (Success, Failed, etc.)
+	DOF            *int
+	Diagnostics    []byte // raw JSONB
+	Placements     []byte // raw JSONB
+	NumFrames      int
+	SolveTimeMS    *float64
+	CreatedAt      time.Time
+}
+
+// SolverResultRepository provides solver_results database operations.
+type SolverResultRepository struct {
+	db *DB
+}
+
+// NewSolverResultRepository creates a new solver result repository.
+func NewSolverResultRepository(db *DB) *SolverResultRepository {
+	return &SolverResultRepository{db: db}
+}
+
+// Upsert inserts or updates a solver result. The UNIQUE(item_id, revision_number, operation)
+// constraint means each revision has at most one result per operation type.
+func (r *SolverResultRepository) Upsert(ctx context.Context, s *SolverResult) error {
+	err := r.db.pool.QueryRow(ctx, `
+		INSERT INTO solver_results (item_id, revision_number, job_id, operation,
+		                            solver_name, status, dof, diagnostics, placements,
+		                            num_frames, solve_time_ms)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+		ON CONFLICT (item_id, revision_number, operation) DO UPDATE SET
+			job_id = EXCLUDED.job_id,
+			solver_name = EXCLUDED.solver_name,
+			status = EXCLUDED.status,
+			dof = EXCLUDED.dof,
+			diagnostics = EXCLUDED.diagnostics,
+			placements = EXCLUDED.placements,
+			num_frames = EXCLUDED.num_frames,
+			solve_time_ms = EXCLUDED.solve_time_ms,
+			created_at = now()
+		RETURNING id, created_at
+	`, s.ItemID, s.RevisionNumber, s.JobID, s.Operation,
+		s.SolverName, s.Status, s.DOF, s.Diagnostics, s.Placements,
+		s.NumFrames, s.SolveTimeMS,
+	).Scan(&s.ID, &s.CreatedAt)
+	if err != nil {
+		return fmt.Errorf("upserting solver result: %w", err)
+	}
+	return nil
+}
+
+// GetByItem returns all solver results for an item, ordered by revision descending.
+func (r *SolverResultRepository) GetByItem(ctx context.Context, itemID string) ([]*SolverResult, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, item_id, revision_number, job_id, operation,
+		       solver_name, status, dof, diagnostics, placements,
+		       num_frames, solve_time_ms, created_at
+		FROM solver_results
+		WHERE item_id = $1
+		ORDER BY revision_number DESC, operation
+	`, itemID)
+	if err != nil {
+		return nil, fmt.Errorf("listing solver results: %w", err)
+	}
+	defer rows.Close()
+	return scanSolverResults(rows)
+}
+
+// GetByItemRevision returns a single solver result for an item/revision/operation.
+func (r *SolverResultRepository) GetByItemRevision(ctx context.Context, itemID string, revision int, operation string) (*SolverResult, error) {
+	s := &SolverResult{}
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, item_id, revision_number, job_id, operation,
+		       solver_name, status, dof, diagnostics, placements,
+		       num_frames, solve_time_ms, created_at
+		FROM solver_results
+		WHERE item_id = $1 AND revision_number = $2 AND operation = $3
+	`, itemID, revision, operation).Scan(
+		&s.ID, &s.ItemID, &s.RevisionNumber, &s.JobID, &s.Operation,
+		&s.SolverName, &s.Status, &s.DOF, &s.Diagnostics, &s.Placements,
+		&s.NumFrames, &s.SolveTimeMS, &s.CreatedAt,
+	)
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("getting solver result: %w", err)
+	}
+	return s, nil
+}
+
+func scanSolverResults(rows pgx.Rows) ([]*SolverResult, error) {
+	var results []*SolverResult
+	for rows.Next() {
+		s := &SolverResult{}
+		if err := rows.Scan(
+			&s.ID, &s.ItemID, &s.RevisionNumber, &s.JobID, &s.Operation,
+			&s.SolverName, &s.Status, &s.DOF, &s.Diagnostics, &s.Placements,
+			&s.NumFrames, &s.SolveTimeMS, &s.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("scanning solver result: %w", err)
+		}
+		results = append(results, s)
+	}
+	return results, rows.Err()
+}

internal/db/workstations.go

@@ -0,0 +1,95 @@
+package db
+
+import (
+	"context"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// Workstation represents a registered client machine.
+type Workstation struct {
+	ID        string
+	Name      string
+	UserID    string
+	Hostname  string
+	LastSeen  time.Time
+	CreatedAt time.Time
+}
+
+// WorkstationRepository provides workstation database operations.
+type WorkstationRepository struct {
+	db *DB
+}
+
+// NewWorkstationRepository creates a new workstation repository.
+func NewWorkstationRepository(db *DB) *WorkstationRepository {
+	return &WorkstationRepository{db: db}
+}
+
+// Upsert registers a workstation, updating hostname and last_seen if it already exists.
+func (r *WorkstationRepository) Upsert(ctx context.Context, w *Workstation) error {
+	return r.db.pool.QueryRow(ctx, `
+		INSERT INTO workstations (name, user_id, hostname)
+		VALUES ($1, $2, $3)
+		ON CONFLICT (user_id, name) DO UPDATE
+			SET hostname = EXCLUDED.hostname, last_seen = now()
+		RETURNING id, last_seen, created_at
+	`, w.Name, w.UserID, w.Hostname).Scan(&w.ID, &w.LastSeen, &w.CreatedAt)
+}
+
+// GetByID returns a workstation by its ID.
+func (r *WorkstationRepository) GetByID(ctx context.Context, id string) (*Workstation, error) {
+	w := &Workstation{}
+	err := r.db.pool.QueryRow(ctx, `
+		SELECT id, name, user_id, hostname, last_seen, created_at
+		FROM workstations
+		WHERE id = $1
+	`, id).Scan(&w.ID, &w.Name, &w.UserID, &w.Hostname, &w.LastSeen, &w.CreatedAt)
+
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return w, nil
+}
+
+// ListByUser returns all workstations for a user.
+func (r *WorkstationRepository) ListByUser(ctx context.Context, userID string) ([]*Workstation, error) {
+	rows, err := r.db.pool.Query(ctx, `
+		SELECT id, name, user_id, hostname, last_seen, created_at
+		FROM workstations
+		WHERE user_id = $1
+		ORDER BY name
+	`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var workstations []*Workstation
+	for rows.Next() {
+		w := &Workstation{}
+		if err := rows.Scan(&w.ID, &w.Name, &w.UserID, &w.Hostname, &w.LastSeen, &w.CreatedAt); err != nil {
+			return nil, err
+		}
+		workstations = append(workstations, w)
+	}
+	return workstations, rows.Err()
+}
+
+// Touch updates a workstation's last_seen timestamp.
+func (r *WorkstationRepository) Touch(ctx context.Context, id string) error {
+	_, err := r.db.pool.Exec(ctx, `
+		UPDATE workstations SET last_seen = now() WHERE id = $1
+	`, id)
+	return err
+}
+
+// Delete removes a workstation.
+func (r *WorkstationRepository) Delete(ctx context.Context, id string) error {
+	_, err := r.db.pool.Exec(ctx, `DELETE FROM workstations WHERE id = $1`, id)
+	return err
+}

internal/jobdef/jobdef.go

@@ -0,0 +1,166 @@
+// Package jobdef handles YAML job definition parsing and validation.
+package jobdef
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Definition represents a compute job definition loaded from YAML.
+type Definition struct {
+	Name        string        `yaml:"name" json:"name"`
+	Version     int           `yaml:"version" json:"version"`
+	Description string        `yaml:"description" json:"description"`
+	Trigger     TriggerConfig `yaml:"trigger" json:"trigger"`
+	Scope       ScopeConfig   `yaml:"scope" json:"scope"`
+	Compute     ComputeConfig `yaml:"compute" json:"compute"`
+	Runner      RunnerConfig  `yaml:"runner" json:"runner"`
+	Timeout     int           `yaml:"timeout" json:"timeout"`
+	MaxRetries  int           `yaml:"max_retries" json:"max_retries"`
+	Priority    int           `yaml:"priority" json:"priority"`
+}
+
+// TriggerConfig describes when a job is created.
+type TriggerConfig struct {
+	Type   string            `yaml:"type" json:"type"`
+	Filter map[string]string `yaml:"filter,omitempty" json:"filter,omitempty"`
+}
+
+// ScopeConfig describes what a job operates on.
+type ScopeConfig struct {
+	Type string `yaml:"type" json:"type"`
+}
+
+// ComputeConfig describes the computation to perform.
+type ComputeConfig struct {
+	Type    string         `yaml:"type" json:"type"`
+	Command string         `yaml:"command" json:"command"`
+	Args    map[string]any `yaml:"args,omitempty" json:"args,omitempty"`
+}
+
+// RunnerConfig describes runner requirements.
+type RunnerConfig struct {
+	Tags []string `yaml:"tags" json:"tags"`
+}
+
+// DefinitionFile wraps a definition for YAML parsing.
+type DefinitionFile struct {
+	Job Definition `yaml:"job"`
+}
+
+var validTriggerTypes = map[string]bool{
+	"revision_created": true,
+	"bom_changed":      true,
+	"manual":           true,
+	"schedule":         true,
+}
+
+var validScopeTypes = map[string]bool{
+	"item":     true,
+	"assembly": true,
+	"project":  true,
+}
+
+var validComputeTypes = map[string]bool{
+	"validate": true,
+	"rebuild":  true,
+	"diff":     true,
+	"export":   true,
+	"custom":   true,
+}
+
+// Load reads a job definition from a YAML file.
+func Load(path string) (*Definition, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading job definition file: %w", err)
+	}
+
+	var df DefinitionFile
+	if err := yaml.Unmarshal(data, &df); err != nil {
+		return nil, fmt.Errorf("parsing job definition YAML: %w", err)
+	}
+
+	def := &df.Job
+
+	// Apply defaults
+	if def.Timeout <= 0 {
+		def.Timeout = 600
+	}
+	if def.MaxRetries <= 0 {
+		def.MaxRetries = 1
+	}
+	if def.Priority <= 0 {
+		def.Priority = 100
+	}
+	if def.Version <= 0 {
+		def.Version = 1
+	}
+
+	if err := def.Validate(); err != nil {
+		return nil, fmt.Errorf("validating %s: %w", path, err)
+	}
+
+	return def, nil
+}
+
+// LoadAll reads all job definitions from a directory.
+func LoadAll(dir string) (map[string]*Definition, error) {
+	defs := make(map[string]*Definition)
+
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return nil, fmt.Errorf("reading job definitions directory: %w", err)
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if !strings.HasSuffix(entry.Name(), ".yaml") && !strings.HasSuffix(entry.Name(), ".yml") {
+			continue
+		}
+
+		path := filepath.Join(dir, entry.Name())
+		def, err := Load(path)
+		if err != nil {
+			return nil, fmt.Errorf("loading %s: %w", entry.Name(), err)
+		}
+		defs[def.Name] = def
+	}
+
+	return defs, nil
+}
+
+// Validate checks that the definition is well-formed.
+func (d *Definition) Validate() error {
+	if d.Name == "" {
+		return fmt.Errorf("job definition name is required")
+	}
+	if d.Trigger.Type == "" {
+		return fmt.Errorf("trigger type is required")
+	}
+	if !validTriggerTypes[d.Trigger.Type] {
+		return fmt.Errorf("invalid trigger type %q", d.Trigger.Type)
+	}
+	if d.Scope.Type == "" {
+		return fmt.Errorf("scope type is required")
+	}
+	if !validScopeTypes[d.Scope.Type] {
+		return fmt.Errorf("invalid scope type %q", d.Scope.Type)
+	}
+	if d.Compute.Type == "" {
+		return fmt.Errorf("compute type is required")
+	}
+	if !validComputeTypes[d.Compute.Type] {
+		return fmt.Errorf("invalid compute type %q", d.Compute.Type)
+	}
+	if d.Compute.Command == "" {
+		return fmt.Errorf("compute command is required")
+	}
+	return nil
+}

internal/jobdef/jobdef_test.go

@@ -0,0 +1,328 @@
+package jobdef
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadValid(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: test-job
+  version: 1
+  description: "A test job"
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: validate
+    command: create-validate
+  runner:
+    tags: [create]
+  timeout: 300
+  max_retries: 2
+  priority: 50
+`
+	path := filepath.Join(dir, "test-job.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	def, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+
+	if def.Name != "test-job" {
+		t.Errorf("name = %q, want %q", def.Name, "test-job")
+	}
+	if def.Version != 1 {
+		t.Errorf("version = %d, want 1", def.Version)
+	}
+	if def.Trigger.Type != "manual" {
+		t.Errorf("trigger type = %q, want %q", def.Trigger.Type, "manual")
+	}
+	if def.Scope.Type != "item" {
+		t.Errorf("scope type = %q, want %q", def.Scope.Type, "item")
+	}
+	if def.Compute.Type != "validate" {
+		t.Errorf("compute type = %q, want %q", def.Compute.Type, "validate")
+	}
+	if def.Compute.Command != "create-validate" {
+		t.Errorf("compute command = %q, want %q", def.Compute.Command, "create-validate")
+	}
+	if len(def.Runner.Tags) != 1 || def.Runner.Tags[0] != "create" {
+		t.Errorf("runner tags = %v, want [create]", def.Runner.Tags)
+	}
+	if def.Timeout != 300 {
+		t.Errorf("timeout = %d, want 300", def.Timeout)
+	}
+	if def.MaxRetries != 2 {
+		t.Errorf("max_retries = %d, want 2", def.MaxRetries)
+	}
+	if def.Priority != 50 {
+		t.Errorf("priority = %d, want 50", def.Priority)
+	}
+}
+
+func TestLoadDefaults(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: minimal
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: custom
+    command: do-something
+`
+	path := filepath.Join(dir, "minimal.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	def, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+
+	if def.Timeout != 600 {
+		t.Errorf("default timeout = %d, want 600", def.Timeout)
+	}
+	if def.MaxRetries != 1 {
+		t.Errorf("default max_retries = %d, want 1", def.MaxRetries)
+	}
+	if def.Priority != 100 {
+		t.Errorf("default priority = %d, want 100", def.Priority)
+	}
+	if def.Version != 1 {
+		t.Errorf("default version = %d, want 1", def.Version)
+	}
+}
+
+func TestLoadInvalidTriggerType(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: bad-trigger
+  trigger:
+    type: invalid_trigger
+  scope:
+    type: item
+  compute:
+    type: validate
+    command: create-validate
+`
+	path := filepath.Join(dir, "bad.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	_, err := Load(path)
+	if err == nil {
+		t.Fatal("expected error for invalid trigger type")
+	}
+}
+
+func TestLoadMissingName(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: validate
+    command: create-validate
+`
+	path := filepath.Join(dir, "no-name.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	_, err := Load(path)
+	if err == nil {
+		t.Fatal("expected error for missing name")
+	}
+}
+
+func TestLoadMissingCommand(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: no-command
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: validate
+`
+	path := filepath.Join(dir, "no-cmd.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	_, err := Load(path)
+	if err == nil {
+		t.Fatal("expected error for missing command")
+	}
+}
+
+func TestLoadAllDirectory(t *testing.T) {
+	dir := t.TempDir()
+
+	job1 := `
+job:
+  name: job-one
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: validate
+    command: create-validate
+`
+	job2 := `
+job:
+  name: job-two
+  trigger:
+    type: revision_created
+  scope:
+    type: assembly
+  compute:
+    type: export
+    command: create-export
+`
+	if err := os.WriteFile(filepath.Join(dir, "one.yaml"), []byte(job1), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "two.yml"), []byte(job2), 0644); err != nil {
+		t.Fatal(err)
+	}
+	// Non-YAML file should be ignored
+	if err := os.WriteFile(filepath.Join(dir, "readme.txt"), []byte("ignore me"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	defs, err := LoadAll(dir)
+	if err != nil {
+		t.Fatalf("LoadAll: %v", err)
+	}
+
+	if len(defs) != 2 {
+		t.Fatalf("loaded %d definitions, want 2", len(defs))
+	}
+	if _, ok := defs["job-one"]; !ok {
+		t.Error("job-one not found")
+	}
+	if _, ok := defs["job-two"]; !ok {
+		t.Error("job-two not found")
+	}
+}
+
+func TestLoadAllEmptyDirectory(t *testing.T) {
+	dir := t.TempDir()
+
+	defs, err := LoadAll(dir)
+	if err != nil {
+		t.Fatalf("LoadAll: %v", err)
+	}
+	if len(defs) != 0 {
+		t.Errorf("loaded %d definitions from empty dir, want 0", len(defs))
+	}
+}
+
+func TestLoadWithFilter(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: filtered-job
+  trigger:
+    type: revision_created
+    filter:
+      item_type: assembly
+  scope:
+    type: assembly
+  compute:
+    type: validate
+    command: create-validate
+`
+	path := filepath.Join(dir, "filtered.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	def, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+
+	if def.Trigger.Filter["item_type"] != "assembly" {
+		t.Errorf("filter item_type = %q, want %q", def.Trigger.Filter["item_type"], "assembly")
+	}
+}
+
+func TestLoadWithArgs(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+job:
+  name: args-job
+  trigger:
+    type: manual
+  scope:
+    type: item
+  compute:
+    type: export
+    command: create-export
+    args:
+      format: step
+      include_mesh: true
+`
+	path := filepath.Join(dir, "args.yaml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	def, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+
+	if def.Compute.Args["format"] != "step" {
+		t.Errorf("args format = %v, want %q", def.Compute.Args["format"], "step")
+	}
+	if def.Compute.Args["include_mesh"] != true {
+		t.Errorf("args include_mesh = %v, want true", def.Compute.Args["include_mesh"])
+	}
+}
+
+func TestValidateInvalidScopeType(t *testing.T) {
+	d := &Definition{
+		Name:    "test",
+		Trigger: TriggerConfig{Type: "manual"},
+		Scope:   ScopeConfig{Type: "galaxy"},
+		Compute: ComputeConfig{Type: "validate", Command: "create-validate"},
+	}
+	if err := d.Validate(); err == nil {
+		t.Fatal("expected error for invalid scope type")
+	}
+}
+
+func TestValidateInvalidComputeType(t *testing.T) {
+	d := &Definition{
+		Name:    "test",
+		Trigger: TriggerConfig{Type: "manual"},
+		Scope:   ScopeConfig{Type: "item"},
+		Compute: ComputeConfig{Type: "teleport", Command: "beam-up"},
+	}
+	if err := d.Validate(); err == nil {
+		t.Fatal("expected error for invalid compute type")
+	}
+}

internal/kc/kc.go

@@ -0,0 +1,200 @@
+// Package kc extracts and parses the silo/ metadata directory from .kc files.
+//
+// A .kc file is a ZIP archive (superset of .fcstd) that contains a silo/
+// directory with JSON metadata entries. This package handles extraction and
+// packing — no database or HTTP dependencies.
+package kc
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// Manifest represents the contents of silo/manifest.json.
+type Manifest struct {
+	UUID         string `json:"uuid"`
+	KCVersion    string `json:"kc_version"`
+	RevisionHash string `json:"revision_hash"`
+	SiloInstance string `json:"silo_instance"`
+}
+
+// Metadata represents the contents of silo/metadata.json.
+type Metadata struct {
+	SchemaName     string         `json:"schema_name"`
+	Tags           []string       `json:"tags"`
+	LifecycleState string         `json:"lifecycle_state"`
+	Fields         map[string]any `json:"fields"`
+}
+
+// Dependency represents one entry in silo/dependencies.json.
+type Dependency struct {
+	UUID         string  `json:"uuid"`
+	PartNumber   string  `json:"part_number"`
+	Revision     int     `json:"revision"`
+	Quantity     float64 `json:"quantity"`
+	Label        string  `json:"label"`
+	Relationship string  `json:"relationship"`
+}
+
+// MacroFile represents a script file found under silo/macros/.
+type MacroFile struct {
+	Filename string
+	Content  string
+}
+
+// ExtractResult holds the parsed silo/ directory contents from a .kc file.
+type ExtractResult struct {
+	Manifest     *Manifest
+	Metadata     *Metadata
+	Dependencies []Dependency
+	Macros       []MacroFile
+}
+
+// HistoryEntry represents one entry in silo/history.json.
+type HistoryEntry struct {
+	RevisionNumber int      `json:"revision_number"`
+	CreatedAt      string   `json:"created_at"`
+	CreatedBy      *string  `json:"created_by,omitempty"`
+	Comment        *string  `json:"comment,omitempty"`
+	Status         string   `json:"status"`
+	Labels         []string `json:"labels"`
+}
+
+// ApprovalEntry represents one entry in silo/approvals.json.
+type ApprovalEntry struct {
+	ID           string           `json:"id"`
+	WorkflowName string           `json:"workflow"`
+	ECONumber    string           `json:"eco_number,omitempty"`
+	State        string           `json:"state"`
+	UpdatedAt    string           `json:"updated_at"`
+	UpdatedBy    string           `json:"updated_by,omitempty"`
+	Signatures   []SignatureEntry `json:"signatures"`
+}
+
+// SignatureEntry represents one signer in an approval.
+type SignatureEntry struct {
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	Status   string `json:"status"`
+	SignedAt string `json:"signed_at,omitempty"`
+	Comment  string `json:"comment,omitempty"`
+}
+
+// PackInput holds all the data needed to repack silo/ entries in a .kc file.
+// Each field is optional — nil/empty means the entry is omitted from the ZIP.
+type PackInput struct {
+	Manifest     *Manifest
+	Metadata     *Metadata
+	History      []HistoryEntry
+	Dependencies []Dependency
+	Approvals    []ApprovalEntry
+}
+
+// Extract opens a ZIP archive from data and parses the silo/ directory.
+// Returns nil, nil if no silo/ directory is found (plain .fcstd file).
+// Returns nil, error if silo/ entries exist but fail to parse.
+func Extract(data []byte) (*ExtractResult, error) {
+	r, err := zip.NewReader(bytes.NewReader(data), int64(len(data)))
+	if err != nil {
+		return nil, fmt.Errorf("kc: open zip: %w", err)
+	}
+
+	var manifestFile, metadataFile, dependenciesFile *zip.File
+	var macroFiles []*zip.File
+	hasSiloDir := false
+
+	for _, f := range r.File {
+		if f.Name == "silo/" || strings.HasPrefix(f.Name, "silo/") {
+			hasSiloDir = true
+		}
+		switch f.Name {
+		case "silo/manifest.json":
+			manifestFile = f
+		case "silo/metadata.json":
+			metadataFile = f
+		case "silo/dependencies.json":
+			dependenciesFile = f
+		default:
+			if strings.HasPrefix(f.Name, "silo/macros/") && !f.FileInfo().IsDir() {
+				name := strings.TrimPrefix(f.Name, "silo/macros/")
+				if name != "" {
+					macroFiles = append(macroFiles, f)
+				}
+			}
+		}
+	}
+
+	if !hasSiloDir {
+		return nil, nil // plain .fcstd, no extraction
+	}
+
+	result := &ExtractResult{}
+
+	if manifestFile != nil {
+		m, err := readJSON[Manifest](manifestFile)
+		if err != nil {
+			return nil, fmt.Errorf("kc: parse manifest.json: %w", err)
+		}
+		result.Manifest = m
+	}
+
+	if metadataFile != nil {
+		m, err := readJSON[Metadata](metadataFile)
+		if err != nil {
+			return nil, fmt.Errorf("kc: parse metadata.json: %w", err)
+		}
+		result.Metadata = m
+	}
+
+	if dependenciesFile != nil {
+		deps, err := readJSON[[]Dependency](dependenciesFile)
+		if err != nil {
+			return nil, fmt.Errorf("kc: parse dependencies.json: %w", err)
+		}
+		if deps != nil {
+			result.Dependencies = *deps
+		}
+	}
+
+	for _, mf := range macroFiles {
+		rc, err := mf.Open()
+		if err != nil {
+			return nil, fmt.Errorf("kc: open macro %s: %w", mf.Name, err)
+		}
+		content, err := io.ReadAll(rc)
+		rc.Close()
+		if err != nil {
+			return nil, fmt.Errorf("kc: read macro %s: %w", mf.Name, err)
+		}
+		result.Macros = append(result.Macros, MacroFile{
+			Filename: strings.TrimPrefix(mf.Name, "silo/macros/"),
+			Content:  string(content),
+		})
+	}
+
+	return result, nil
+}
+
+// readJSON opens a zip.File and decodes its contents as JSON into T.
+func readJSON[T any](f *zip.File) (*T, error) {
+	rc, err := f.Open()
+	if err != nil {
+		return nil, err
+	}
+	defer rc.Close()
+
+	data, err := io.ReadAll(rc)
+	if err != nil {
+		return nil, err
+	}
+
+	var v T
+	if err := json.Unmarshal(data, &v); err != nil {
+		return nil, err
+	}
+	return &v, nil
+}

internal/kc/kc_test.go

@@ -0,0 +1,188 @@
+package kc
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"testing"
+)
+
+// buildZip creates a ZIP archive in memory from a map of filename → content.
+func buildZip(t *testing.T, files map[string][]byte) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	w := zip.NewWriter(&buf)
+	for name, content := range files {
+		f, err := w.Create(name)
+		if err != nil {
+			t.Fatalf("creating zip entry %s: %v", name, err)
+		}
+		if _, err := f.Write(content); err != nil {
+			t.Fatalf("writing zip entry %s: %v", name, err)
+		}
+	}
+	if err := w.Close(); err != nil {
+		t.Fatalf("closing zip: %v", err)
+	}
+	return buf.Bytes()
+}
+
+func mustJSON(t *testing.T, v any) []byte {
+	t.Helper()
+	data, err := json.Marshal(v)
+	if err != nil {
+		t.Fatalf("marshaling JSON: %v", err)
+	}
+	return data
+}
+
+func TestExtract_PlainFCStd(t *testing.T) {
+	data := buildZip(t, map[string][]byte{
+		"Document.xml":     []byte("<xml/>"),
+		"thumbnails/a.png": []byte("png"),
+	})
+
+	result, err := Extract(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result != nil {
+		t.Fatalf("expected nil result for plain .fcstd, got %+v", result)
+	}
+}
+
+func TestExtract_ValidKC(t *testing.T) {
+	manifest := Manifest{
+		UUID:         "550e8400-e29b-41d4-a716-446655440000",
+		KCVersion:    "1.0",
+		RevisionHash: "abc123",
+		SiloInstance: "https://silo.example.com",
+	}
+	metadata := Metadata{
+		SchemaName:     "mechanical-part-v2",
+		Tags:           []string{"structural", "aluminum"},
+		LifecycleState: "draft",
+		Fields: map[string]any{
+			"material":  "6061-T6",
+			"weight_kg": 0.34,
+		},
+	}
+
+	data := buildZip(t, map[string][]byte{
+		"Document.xml":       []byte("<xml/>"),
+		"silo/manifest.json": mustJSON(t, manifest),
+		"silo/metadata.json": mustJSON(t, metadata),
+	})
+
+	result, err := Extract(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result == nil {
+		t.Fatal("expected non-nil result")
+	}
+
+	if result.Manifest == nil {
+		t.Fatal("expected manifest")
+	}
+	if result.Manifest.UUID != manifest.UUID {
+		t.Errorf("manifest UUID = %q, want %q", result.Manifest.UUID, manifest.UUID)
+	}
+	if result.Manifest.KCVersion != manifest.KCVersion {
+		t.Errorf("manifest KCVersion = %q, want %q", result.Manifest.KCVersion, manifest.KCVersion)
+	}
+	if result.Manifest.RevisionHash != manifest.RevisionHash {
+		t.Errorf("manifest RevisionHash = %q, want %q", result.Manifest.RevisionHash, manifest.RevisionHash)
+	}
+	if result.Manifest.SiloInstance != manifest.SiloInstance {
+		t.Errorf("manifest SiloInstance = %q, want %q", result.Manifest.SiloInstance, manifest.SiloInstance)
+	}
+
+	if result.Metadata == nil {
+		t.Fatal("expected metadata")
+	}
+	if result.Metadata.SchemaName != metadata.SchemaName {
+		t.Errorf("metadata SchemaName = %q, want %q", result.Metadata.SchemaName, metadata.SchemaName)
+	}
+	if result.Metadata.LifecycleState != metadata.LifecycleState {
+		t.Errorf("metadata LifecycleState = %q, want %q", result.Metadata.LifecycleState, metadata.LifecycleState)
+	}
+	if len(result.Metadata.Tags) != 2 {
+		t.Errorf("metadata Tags len = %d, want 2", len(result.Metadata.Tags))
+	}
+	if result.Metadata.Fields["material"] != "6061-T6" {
+		t.Errorf("metadata Fields[material] = %v, want 6061-T6", result.Metadata.Fields["material"])
+	}
+}
+
+func TestExtract_ManifestOnly(t *testing.T) {
+	manifest := Manifest{
+		UUID:      "550e8400-e29b-41d4-a716-446655440000",
+		KCVersion: "1.0",
+	}
+
+	data := buildZip(t, map[string][]byte{
+		"Document.xml":       []byte("<xml/>"),
+		"silo/manifest.json": mustJSON(t, manifest),
+	})
+
+	result, err := Extract(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result == nil {
+		t.Fatal("expected non-nil result")
+	}
+	if result.Manifest == nil {
+		t.Fatal("expected manifest")
+	}
+	if result.Metadata != nil {
+		t.Errorf("expected nil metadata, got %+v", result.Metadata)
+	}
+}
+
+func TestExtract_InvalidJSON(t *testing.T) {
+	data := buildZip(t, map[string][]byte{
+		"silo/manifest.json": []byte("{not valid json"),
+	})
+
+	result, err := Extract(data)
+	if err == nil {
+		t.Fatal("expected error for invalid JSON")
+	}
+	if result != nil {
+		t.Errorf("expected nil result on error, got %+v", result)
+	}
+}
+
+func TestExtract_NotAZip(t *testing.T) {
+	result, err := Extract([]byte("this is not a zip file"))
+	if err == nil {
+		t.Fatal("expected error for non-ZIP data")
+	}
+	if result != nil {
+		t.Errorf("expected nil result on error, got %+v", result)
+	}
+}
+
+func TestExtract_EmptySiloDir(t *testing.T) {
+	// silo/ directory entry exists but no manifest or metadata files
+	data := buildZip(t, map[string][]byte{
+		"Document.xml": []byte("<xml/>"),
+		"silo/":        {},
+	})
+
+	result, err := Extract(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result == nil {
+		t.Fatal("expected non-nil result for silo/ dir")
+	}
+	if result.Manifest != nil {
+		t.Errorf("expected nil manifest, got %+v", result.Manifest)
+	}
+	if result.Metadata != nil {
+		t.Errorf("expected nil metadata, got %+v", result.Metadata)
+	}
+}

internal/kc/pack.go

@@ -0,0 +1,136 @@
+package kc
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// HasSiloDir opens a ZIP archive and returns true if any entry starts with "silo/".
+// This is a lightweight check used to short-circuit before gathering DB data.
+func HasSiloDir(data []byte) (bool, error) {
+	r, err := zip.NewReader(bytes.NewReader(data), int64(len(data)))
+	if err != nil {
+		return false, fmt.Errorf("kc: open zip: %w", err)
+	}
+	for _, f := range r.File {
+		if f.Name == "silo/" || strings.HasPrefix(f.Name, "silo/") {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// Pack takes original ZIP file bytes and a PackInput, and returns new ZIP bytes
+// with all silo/ entries replaced by the data from input. Non-silo entries
+// (FreeCAD Document.xml, thumbnails, etc.) are copied verbatim with their
+// original compression method and timestamps preserved.
+//
+// If the original ZIP contains no silo/ directory, the original bytes are
+// returned unchanged (plain .fcstd pass-through).
+func Pack(original []byte, input *PackInput) ([]byte, error) {
+	r, err := zip.NewReader(bytes.NewReader(original), int64(len(original)))
+	if err != nil {
+		return nil, fmt.Errorf("kc: open zip: %w", err)
+	}
+
+	// Partition entries into silo/ vs non-silo.
+	hasSilo := false
+	for _, f := range r.File {
+		if f.Name == "silo/" || strings.HasPrefix(f.Name, "silo/") {
+			hasSilo = true
+			break
+		}
+	}
+	if !hasSilo {
+		return original, nil // plain .fcstd, no repacking needed
+	}
+
+	var buf bytes.Buffer
+	zw := zip.NewWriter(&buf)
+
+	// Copy all non-silo entries verbatim.
+	for _, f := range r.File {
+		if f.Name == "silo/" || strings.HasPrefix(f.Name, "silo/") {
+			continue
+		}
+		if err := copyZipEntry(zw, f); err != nil {
+			return nil, fmt.Errorf("kc: copying entry %s: %w", f.Name, err)
+		}
+	}
+
+	// Write new silo/ entries from PackInput.
+	if input.Manifest != nil {
+		if err := writeJSONEntry(zw, "silo/manifest.json", input.Manifest); err != nil {
+			return nil, fmt.Errorf("kc: writing manifest.json: %w", err)
+		}
+	}
+	if input.Metadata != nil {
+		if err := writeJSONEntry(zw, "silo/metadata.json", input.Metadata); err != nil {
+			return nil, fmt.Errorf("kc: writing metadata.json: %w", err)
+		}
+	}
+	if input.History != nil {
+		if err := writeJSONEntry(zw, "silo/history.json", input.History); err != nil {
+			return nil, fmt.Errorf("kc: writing history.json: %w", err)
+		}
+	}
+	if input.Dependencies != nil {
+		if err := writeJSONEntry(zw, "silo/dependencies.json", input.Dependencies); err != nil {
+			return nil, fmt.Errorf("kc: writing dependencies.json: %w", err)
+		}
+	}
+	if input.Approvals != nil {
+		if err := writeJSONEntry(zw, "silo/approvals.json", input.Approvals); err != nil {
+			return nil, fmt.Errorf("kc: writing approvals.json: %w", err)
+		}
+	}
+
+	if err := zw.Close(); err != nil {
+		return nil, fmt.Errorf("kc: closing zip writer: %w", err)
+	}
+
+	return buf.Bytes(), nil
+}
+
+// copyZipEntry copies a single entry from the original ZIP to the new writer,
+// preserving the file header (compression method, timestamps, etc.).
+func copyZipEntry(zw *zip.Writer, f *zip.File) error {
+	header := f.FileHeader
+	w, err := zw.CreateHeader(&header)
+	if err != nil {
+		return err
+	}
+
+	rc, err := f.Open()
+	if err != nil {
+		return err
+	}
+	defer rc.Close()
+
+	_, err = io.Copy(w, rc)
+	return err
+}
+
+// writeJSONEntry writes a new silo/ entry as JSON with Deflate compression.
+func writeJSONEntry(zw *zip.Writer, name string, v any) error {
+	data, err := json.MarshalIndent(v, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	header := &zip.FileHeader{
+		Name:   name,
+		Method: zip.Deflate,
+	}
+	w, err := zw.CreateHeader(header)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(data)
+	return err
+}

internal/kc/pack_test.go

@@ -0,0 +1,229 @@
+package kc
+
+import (
+	"archive/zip"
+	"bytes"
+	"io"
+	"testing"
+)
+
+func TestHasSiloDir_PlainFCStd(t *testing.T) {
+	data := buildZip(t, map[string][]byte{
+		"Document.xml": []byte("<xml/>"),
+	})
+	has, err := HasSiloDir(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if has {
+		t.Fatal("expected false for plain .fcstd")
+	}
+}
+
+func TestHasSiloDir_KC(t *testing.T) {
+	data := buildZip(t, map[string][]byte{
+		"Document.xml":       []byte("<xml/>"),
+		"silo/manifest.json": []byte("{}"),
+	})
+	has, err := HasSiloDir(data)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !has {
+		t.Fatal("expected true for .kc with silo/ dir")
+	}
+}
+
+func TestHasSiloDir_NotAZip(t *testing.T) {
+	_, err := HasSiloDir([]byte("not a zip"))
+	if err == nil {
+		t.Fatal("expected error for non-ZIP data")
+	}
+}
+
+func TestPack_PlainFCStd_Passthrough(t *testing.T) {
+	original := buildZip(t, map[string][]byte{
+		"Document.xml":     []byte("<xml/>"),
+		"thumbnails/a.png": []byte("png-data"),
+	})
+
+	result, err := Pack(original, &PackInput{
+		Manifest: &Manifest{UUID: "test"},
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !bytes.Equal(result, original) {
+		t.Fatal("expected original bytes returned unchanged for plain .fcstd")
+	}
+}
+
+func TestPack_RoundTrip(t *testing.T) {
+	// Build a .kc with old silo/ data
+	oldManifest := Manifest{UUID: "old-uuid", KCVersion: "0.9", RevisionHash: "old-hash"}
+	oldMetadata := Metadata{SchemaName: "old-schema", Tags: []string{"old"}, LifecycleState: "draft"}
+
+	original := buildZip(t, map[string][]byte{
+		"Document.xml":       []byte("<freecad/>"),
+		"thumbnails/t.png":   []byte("thumb-data"),
+		"silo/manifest.json": mustJSON(t, oldManifest),
+		"silo/metadata.json": mustJSON(t, oldMetadata),
+	})
+
+	// Pack with new data
+	newManifest := &Manifest{UUID: "new-uuid", KCVersion: "1.0", RevisionHash: "new-hash", SiloInstance: "https://silo.test"}
+	newMetadata := &Metadata{SchemaName: "mechanical-part-v2", Tags: []string{"aluminum", "structural"}, LifecycleState: "review", Fields: map[string]any{"material": "7075-T6"}}
+	comment := "initial commit"
+	history := []HistoryEntry{
+		{RevisionNumber: 1, CreatedAt: "2026-01-01T00:00:00Z", Comment: &comment, Status: "draft", Labels: []string{}},
+	}
+
+	packed, err := Pack(original, &PackInput{
+		Manifest:     newManifest,
+		Metadata:     newMetadata,
+		History:      history,
+		Dependencies: []Dependency{},
+	})
+	if err != nil {
+		t.Fatalf("Pack error: %v", err)
+	}
+
+	// Extract and verify new silo/ data
+	result, err := Extract(packed)
+	if err != nil {
+		t.Fatalf("Extract error: %v", err)
+	}
+	if result == nil {
+		t.Fatal("expected non-nil extract result")
+	}
+	if result.Manifest.UUID != "new-uuid" {
+		t.Errorf("manifest UUID = %q, want %q", result.Manifest.UUID, "new-uuid")
+	}
+	if result.Manifest.KCVersion != "1.0" {
+		t.Errorf("manifest KCVersion = %q, want %q", result.Manifest.KCVersion, "1.0")
+	}
+	if result.Manifest.SiloInstance != "https://silo.test" {
+		t.Errorf("manifest SiloInstance = %q, want %q", result.Manifest.SiloInstance, "https://silo.test")
+	}
+	if result.Metadata.SchemaName != "mechanical-part-v2" {
+		t.Errorf("metadata SchemaName = %q, want %q", result.Metadata.SchemaName, "mechanical-part-v2")
+	}
+	if result.Metadata.LifecycleState != "review" {
+		t.Errorf("metadata LifecycleState = %q, want %q", result.Metadata.LifecycleState, "review")
+	}
+	if len(result.Metadata.Tags) != 2 {
+		t.Errorf("metadata Tags len = %d, want 2", len(result.Metadata.Tags))
+	}
+	if result.Metadata.Fields["material"] != "7075-T6" {
+		t.Errorf("metadata Fields[material] = %v, want 7075-T6", result.Metadata.Fields["material"])
+	}
+
+	// Verify non-silo entries are preserved
+	r, err := zip.NewReader(bytes.NewReader(packed), int64(len(packed)))
+	if err != nil {
+		t.Fatalf("opening packed ZIP: %v", err)
+	}
+	entryMap := make(map[string]bool)
+	for _, f := range r.File {
+		entryMap[f.Name] = true
+	}
+	if !entryMap["Document.xml"] {
+		t.Error("Document.xml missing from packed ZIP")
+	}
+	if !entryMap["thumbnails/t.png"] {
+		t.Error("thumbnails/t.png missing from packed ZIP")
+	}
+
+	// Verify non-silo content is byte-identical
+	for _, f := range r.File {
+		if f.Name == "Document.xml" {
+			content := readZipEntry(t, f)
+			if string(content) != "<freecad/>" {
+				t.Errorf("Document.xml content = %q, want %q", content, "<freecad/>")
+			}
+		}
+		if f.Name == "thumbnails/t.png" {
+			content := readZipEntry(t, f)
+			if string(content) != "thumb-data" {
+				t.Errorf("thumbnails/t.png content = %q, want %q", content, "thumb-data")
+			}
+		}
+	}
+}
+
+func TestPack_NilFields(t *testing.T) {
+	original := buildZip(t, map[string][]byte{
+		"Document.xml":       []byte("<xml/>"),
+		"silo/manifest.json": []byte(`{"uuid":"x"}`),
+	})
+
+	// Pack with only manifest, nil metadata/history/deps
+	packed, err := Pack(original, &PackInput{
+		Manifest: &Manifest{UUID: "updated"},
+	})
+	if err != nil {
+		t.Fatalf("Pack error: %v", err)
+	}
+
+	// Extract — should have manifest but no metadata
+	result, err := Extract(packed)
+	if err != nil {
+		t.Fatalf("Extract error: %v", err)
+	}
+	if result.Manifest == nil || result.Manifest.UUID != "updated" {
+		t.Errorf("manifest UUID = %v, want updated", result.Manifest)
+	}
+	if result.Metadata != nil {
+		t.Errorf("expected nil metadata, got %+v", result.Metadata)
+	}
+
+	// Verify no old silo/ entries leaked through
+	r, _ := zip.NewReader(bytes.NewReader(packed), int64(len(packed)))
+	for _, f := range r.File {
+		if f.Name == "silo/metadata.json" {
+			t.Error("old silo/metadata.json should have been removed")
+		}
+	}
+}
+
+func TestPack_EmptyDependencies(t *testing.T) {
+	original := buildZip(t, map[string][]byte{
+		"silo/manifest.json": []byte(`{"uuid":"x"}`),
+	})
+
+	packed, err := Pack(original, &PackInput{
+		Manifest:     &Manifest{UUID: "x"},
+		Dependencies: []Dependency{},
+	})
+	if err != nil {
+		t.Fatalf("Pack error: %v", err)
+	}
+
+	// Verify dependencies.json exists and is []
+	r, _ := zip.NewReader(bytes.NewReader(packed), int64(len(packed)))
+	for _, f := range r.File {
+		if f.Name == "silo/dependencies.json" {
+			content := readZipEntry(t, f)
+			if string(content) != "[]" {
+				t.Errorf("dependencies.json = %q, want %q", content, "[]")
+			}
+			return
+		}
+	}
+	t.Error("silo/dependencies.json not found in packed ZIP")
+}
+
+// readZipEntry reads the full contents of a zip.File.
+func readZipEntry(t *testing.T, f *zip.File) []byte {
+	t.Helper()
+	rc, err := f.Open()
+	if err != nil {
+		t.Fatalf("opening zip entry %s: %v", f.Name, err)
+	}
+	defer rc.Close()
+	data, err := io.ReadAll(rc)
+	if err != nil {
+		t.Fatalf("reading zip entry %s: %v", f.Name, err)
+	}
+	return data
+}

internal/modules/loader.go

@@ -0,0 +1,86 @@
+package modules
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/kindredsystems/silo/internal/config"
+)
+
+// LoadState applies module state from config YAML and database overrides.
+//
+// Precedence (highest wins):
+//  1. Database module_state table
+//  2. YAML modules.* toggles
+//  3. Backward-compat YAML fields (auth.enabled, odoo.enabled)
+//  4. Module defaults (set by NewRegistry)
+func LoadState(r *Registry, cfg *config.Config, pool *pgxpool.Pool) error {
+	// Step 1: Apply backward-compat top-level YAML fields.
+	// auth.enabled and odoo.enabled existed before the modules section.
+	// Only apply if the new modules.* section doesn't override them.
+	if cfg.Modules.Auth == nil {
+		r.setEnabledUnchecked(Auth, cfg.Auth.Enabled)
+	}
+	if cfg.Modules.Odoo == nil {
+		r.setEnabledUnchecked(Odoo, cfg.Odoo.Enabled)
+	}
+
+	// Step 2: Apply explicit modules.* YAML toggles (override defaults + compat).
+	applyToggle(r, Auth, cfg.Modules.Auth)
+	applyToggle(r, Projects, cfg.Modules.Projects)
+	applyToggle(r, Audit, cfg.Modules.Audit)
+	applyToggle(r, Odoo, cfg.Modules.Odoo)
+	applyToggle(r, FreeCAD, cfg.Modules.FreeCAD)
+	applyToggle(r, Jobs, cfg.Modules.Jobs)
+	applyToggle(r, DAG, cfg.Modules.DAG)
+	applyToggle(r, Solver, cfg.Modules.Solver)
+	applyToggle(r, Sessions, cfg.Modules.Sessions)
+
+	// Step 3: Apply database overrides (highest precedence).
+	if pool != nil {
+		if err := loadFromDB(r, pool); err != nil {
+			return err
+		}
+	}
+
+	// Step 4: Validate the final state.
+	return r.ValidateDependencies()
+}
+
+// applyToggle sets a module's state from a YAML ModuleToggle if present.
+func applyToggle(r *Registry, id string, toggle *config.ModuleToggle) {
+	if toggle == nil || toggle.Enabled == nil {
+		return
+	}
+	r.setEnabledUnchecked(id, *toggle.Enabled)
+}
+
+// setEnabledUnchecked sets module state without dependency validation.
+// Used during loading when the full state is being assembled incrementally.
+func (r *Registry) setEnabledUnchecked(id string, enabled bool) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if m, ok := r.modules[id]; ok && !m.Required {
+		m.enabled = enabled
+	}
+}
+
+// loadFromDB reads module_state rows and applies them to the registry.
+func loadFromDB(r *Registry, pool *pgxpool.Pool) error {
+	rows, err := pool.Query(context.Background(),
+		`SELECT module_id, enabled FROM module_state`)
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id string
+		var enabled bool
+		if err := rows.Scan(&id, &enabled); err != nil {
+			return err
+		}
+		r.setEnabledUnchecked(id, enabled)
+	}
+	return rows.Err()
+}

internal/modules/loader_test.go

@@ -0,0 +1,92 @@
+package modules
+
+import (
+	"testing"
+
+	"github.com/kindredsystems/silo/internal/config"
+)
+
+func boolPtr(v bool) *bool { return &v }
+
+func TestLoadState_DefaultsOnly(t *testing.T) {
+	r := NewRegistry()
+	cfg := &config.Config{}
+	// Sessions depends on Auth; when auth is disabled via backward-compat
+	// zero value, sessions must also be explicitly disabled.
+	cfg.Modules.Sessions = &config.ModuleToggle{Enabled: boolPtr(false)}
+
+	if err := LoadState(r, cfg, nil); err != nil {
+		t.Fatalf("LoadState: %v", err)
+	}
+
+	// Auth defaults to true from registry, but cfg.Auth.Enabled is false
+	// (zero value) and backward-compat applies, so auth ends up disabled.
+	if r.IsEnabled(Auth) {
+		t.Error("auth should be disabled (cfg.Auth.Enabled is false by default)")
+	}
+}
+
+func TestLoadState_BackwardCompat(t *testing.T) {
+	r := NewRegistry()
+	cfg := &config.Config{}
+	cfg.Auth.Enabled = true
+	cfg.Odoo.Enabled = true
+
+	if err := LoadState(r, cfg, nil); err != nil {
+		t.Fatalf("LoadState: %v", err)
+	}
+
+	if !r.IsEnabled(Auth) {
+		t.Error("auth should be enabled via cfg.Auth.Enabled")
+	}
+	if !r.IsEnabled(Odoo) {
+		t.Error("odoo should be enabled via cfg.Odoo.Enabled")
+	}
+}
+
+func TestLoadState_YAMLModulesOverrideCompat(t *testing.T) {
+	r := NewRegistry()
+	cfg := &config.Config{}
+	cfg.Auth.Enabled = true                                              // compat says enabled
+	cfg.Modules.Auth = &config.ModuleToggle{Enabled: boolPtr(false)}     // explicit says disabled
+	cfg.Modules.Sessions = &config.ModuleToggle{Enabled: boolPtr(false)} // sessions depends on auth
+
+	if err := LoadState(r, cfg, nil); err != nil {
+		t.Fatalf("LoadState: %v", err)
+	}
+
+	if r.IsEnabled(Auth) {
+		t.Error("modules.auth.enabled=false should override auth.enabled=true")
+	}
+}
+
+func TestLoadState_EnableJobsAndDAG(t *testing.T) {
+	r := NewRegistry()
+	cfg := &config.Config{}
+	cfg.Auth.Enabled = true
+	cfg.Modules.Jobs = &config.ModuleToggle{Enabled: boolPtr(true)}
+	cfg.Modules.DAG = &config.ModuleToggle{Enabled: boolPtr(true)}
+
+	if err := LoadState(r, cfg, nil); err != nil {
+		t.Fatalf("LoadState: %v", err)
+	}
+
+	if !r.IsEnabled(Jobs) {
+		t.Error("jobs should be enabled")
+	}
+	if !r.IsEnabled(DAG) {
+		t.Error("dag should be enabled")
+	}
+}
+
+func TestLoadState_InvalidDependency(t *testing.T) {
+	r := NewRegistry()
+	cfg := &config.Config{}
+	// Auth disabled (default), but enable jobs which depends on auth.
+	cfg.Modules.Jobs = &config.ModuleToggle{Enabled: boolPtr(true)}
+
+	err := LoadState(r, cfg, nil)
+	if err == nil {
+		t.Error("should fail: jobs enabled but auth disabled")
+	}
+}

internal/modules/modules.go

@@ -0,0 +1,167 @@
+// Package modules provides the module registry for Silo.
+// Each module groups API endpoints, UI views, and configuration.
+// Modules can be required (always on) or optional (admin-toggleable).
+package modules
+
+import (
+	"fmt"
+	"sort"
+	"sync"
+)
+
+// Module IDs.
+const (
+	Core     = "core"
+	Schemas  = "schemas"
+	Storage  = "storage"
+	Auth     = "auth"
+	Projects = "projects"
+	Audit    = "audit"
+	Odoo     = "odoo"
+	FreeCAD  = "freecad"
+	Jobs     = "jobs"
+	DAG      = "dag"
+	Solver   = "solver"
+	Sessions = "sessions"
+)
+
+// ModuleInfo describes a module's metadata.
+type ModuleInfo struct {
+	ID             string
+	Name           string
+	Description    string
+	Required       bool     // cannot be disabled
+	DefaultEnabled bool     // initial state for optional modules
+	DependsOn      []string // module IDs this module requires
+	Version        string
+}
+
+// registry entries with their runtime enabled state.
+type moduleState struct {
+	ModuleInfo
+	enabled bool
+}
+
+// Registry holds all module definitions and their enabled state.
+type Registry struct {
+	mu      sync.RWMutex
+	modules map[string]*moduleState
+}
+
+// builtinModules defines the complete set of Silo modules.
+var builtinModules = []ModuleInfo{
+	{ID: Core, Name: "Core PDM", Description: "Items, revisions, files, BOM, search, import/export", Required: true, Version: "0.2"},
+	{ID: Schemas, Name: "Schemas", Description: "Part numbering schema parsing and segment management", Required: true},
+	{ID: Storage, Name: "Storage", Description: "Filesystem storage", Required: true},
+	{ID: Auth, Name: "Authentication", Description: "Local, LDAP, OIDC authentication and RBAC", DefaultEnabled: true},
+	{ID: Projects, Name: "Projects", Description: "Project management and item tagging", DefaultEnabled: true},
+	{ID: Audit, Name: "Audit", Description: "Audit logging, completeness scoring", DefaultEnabled: true},
+	{ID: Odoo, Name: "Odoo ERP", Description: "Odoo integration (config, sync-log, push/pull)", DependsOn: []string{Auth}},
+	{ID: FreeCAD, Name: "Create Integration", Description: "URI scheme, executable path, client settings", DefaultEnabled: true},
+	{ID: Jobs, Name: "Job Queue", Description: "Async compute jobs, runner management", DependsOn: []string{Auth}},
+	{ID: DAG, Name: "Dependency DAG", Description: "Feature DAG sync, validation states, interference detection", DependsOn: []string{Jobs}},
+	{ID: Solver, Name: "Solver", Description: "Assembly constraint solving via server-side runners", DependsOn: []string{Jobs}},
+	{ID: Sessions, Name: "Sessions", Description: "Workstation registration, edit sessions, and presence tracking", DependsOn: []string{Auth}, DefaultEnabled: true},
+}
+
+// NewRegistry creates a registry with all builtin modules set to their default state.
+func NewRegistry() *Registry {
+	r := &Registry{modules: make(map[string]*moduleState, len(builtinModules))}
+	for _, m := range builtinModules {
+		enabled := m.Required || m.DefaultEnabled
+		r.modules[m.ID] = &moduleState{ModuleInfo: m, enabled: enabled}
+	}
+	return r
+}
+
+// IsEnabled returns whether a module is currently enabled.
+func (r *Registry) IsEnabled(id string) bool {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	if m, ok := r.modules[id]; ok {
+		return m.enabled
+	}
+	return false
+}
+
+// SetEnabled changes a module's enabled state with dependency validation.
+func (r *Registry) SetEnabled(id string, enabled bool) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	m, ok := r.modules[id]
+	if !ok {
+		return fmt.Errorf("unknown module %q", id)
+	}
+
+	if m.Required {
+		return fmt.Errorf("module %q is required and cannot be disabled", id)
+	}
+
+	if enabled {
+		// Check that all dependencies are enabled.
+		for _, dep := range m.DependsOn {
+			if dm, ok := r.modules[dep]; ok && !dm.enabled {
+				return fmt.Errorf("cannot enable %q: dependency %q is disabled", id, dep)
+			}
+		}
+	} else {
+		// Check that no enabled module depends on this one.
+		for _, other := range r.modules {
+			if !other.enabled || other.ID == id {
+				continue
+			}
+			for _, dep := range other.DependsOn {
+				if dep == id {
+					return fmt.Errorf("cannot disable %q: module %q depends on it", id, other.ID)
+				}
+			}
+		}
+	}
+
+	m.enabled = enabled
+	return nil
+}
+
+// All returns info for every module, sorted by ID.
+func (r *Registry) All() []ModuleInfo {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	out := make([]ModuleInfo, 0, len(r.modules))
+	for _, m := range r.modules {
+		out = append(out, m.ModuleInfo)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].ID < out[j].ID })
+	return out
+}
+
+// Get returns info for a single module, or nil if not found.
+func (r *Registry) Get(id string) *ModuleInfo {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	if m, ok := r.modules[id]; ok {
+		info := m.ModuleInfo
+		return &info
+	}
+	return nil
+}
+
+// ValidateDependencies checks that every enabled module's dependencies
+// are also enabled. Returns the first violation found.
+func (r *Registry) ValidateDependencies() error {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	for _, m := range r.modules {
+		if !m.enabled {
+			continue
+		}
+		for _, dep := range m.DependsOn {
+			if dm, ok := r.modules[dep]; ok && !dm.enabled {
+				return fmt.Errorf("module %q is enabled but its dependency %q is disabled", m.ID, dep)
+			}
+		}
+	}
+	return nil
+}

internal/modules/modules_test.go

@@ -0,0 +1,169 @@
+package modules
+
+import (
+	"testing"
+)
+
+func TestNewRegistry_DefaultState(t *testing.T) {
+	r := NewRegistry()
+
+	// Required modules are always enabled.
+	for _, id := range []string{Core, Schemas, Storage} {
+		if !r.IsEnabled(id) {
+			t.Errorf("required module %q should be enabled by default", id)
+		}
+	}
+
+	// Optional modules with DefaultEnabled=true.
+	for _, id := range []string{Auth, Projects, Audit, FreeCAD} {
+		if !r.IsEnabled(id) {
+			t.Errorf("module %q should be enabled by default", id)
+		}
+	}
+
+	// Optional modules with DefaultEnabled=false.
+	for _, id := range []string{Odoo, Jobs, DAG} {
+		if r.IsEnabled(id) {
+			t.Errorf("module %q should be disabled by default", id)
+		}
+	}
+}
+
+func TestSetEnabled_BasicToggle(t *testing.T) {
+	r := NewRegistry()
+
+	// Disable an optional module with no dependents.
+	if err := r.SetEnabled(Projects, false); err != nil {
+		t.Fatalf("disabling projects: %v", err)
+	}
+	if r.IsEnabled(Projects) {
+		t.Error("projects should be disabled after SetEnabled(false)")
+	}
+
+	// Re-enable it.
+	if err := r.SetEnabled(Projects, true); err != nil {
+		t.Fatalf("enabling projects: %v", err)
+	}
+	if !r.IsEnabled(Projects) {
+		t.Error("projects should be enabled after SetEnabled(true)")
+	}
+}
+
+func TestCannotDisableRequired(t *testing.T) {
+	r := NewRegistry()
+
+	for _, id := range []string{Core, Schemas, Storage} {
+		if err := r.SetEnabled(id, false); err == nil {
+			t.Errorf("disabling required module %q should return error", id)
+		}
+	}
+}
+
+func TestDependencyChain_EnableWithoutDep(t *testing.T) {
+	r := NewRegistry()
+
+	// Jobs depends on Auth. Auth is enabled by default, so enabling jobs works.
+	if err := r.SetEnabled(Jobs, true); err != nil {
+		t.Fatalf("enabling jobs (auth enabled): %v", err)
+	}
+
+	// DAG depends on Jobs. Jobs is now enabled, so enabling dag works.
+	if err := r.SetEnabled(DAG, true); err != nil {
+		t.Fatalf("enabling dag (jobs enabled): %v", err)
+	}
+
+	// Now try with deps disabled. Start fresh.
+	r2 := NewRegistry()
+
+	// DAG depends on Jobs, which is disabled by default.
+	if err := r2.SetEnabled(DAG, true); err == nil {
+		t.Error("enabling dag without jobs should fail")
+	}
+}
+
+func TestDisableDependedOn(t *testing.T) {
+	r := NewRegistry()
+
+	// Enable the full chain: auth (already on) → jobs → dag.
+	if err := r.SetEnabled(Jobs, true); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.SetEnabled(DAG, true); err != nil {
+		t.Fatal(err)
+	}
+
+	// Cannot disable jobs while dag depends on it.
+	if err := r.SetEnabled(Jobs, false); err == nil {
+		t.Error("disabling jobs while dag is enabled should fail")
+	}
+
+	// Disable dag first, then jobs should work.
+	if err := r.SetEnabled(DAG, false); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.SetEnabled(Jobs, false); err != nil {
+		t.Fatalf("disabling jobs after dag disabled: %v", err)
+	}
+}
+
+func TestCannotDisableAuthWhileJobsEnabled(t *testing.T) {
+	r := NewRegistry()
+
+	if err := r.SetEnabled(Jobs, true); err != nil {
+		t.Fatal(err)
+	}
+
+	// Auth is depended on by jobs.
+	if err := r.SetEnabled(Auth, false); err == nil {
+		t.Error("disabling auth while jobs is enabled should fail")
+	}
+}
+
+func TestUnknownModule(t *testing.T) {
+	r := NewRegistry()
+
+	if r.IsEnabled("nonexistent") {
+		t.Error("unknown module should not be enabled")
+	}
+	if err := r.SetEnabled("nonexistent", true); err == nil {
+		t.Error("setting unknown module should return error")
+	}
+	if r.Get("nonexistent") != nil {
+		t.Error("getting unknown module should return nil")
+	}
+}
+
+func TestAll_ReturnsAllModules(t *testing.T) {
+	r := NewRegistry()
+	all := r.All()
+
+	if len(all) != 12 {
+		t.Errorf("expected 12 modules, got %d", len(all))
+	}
+
+	// Should be sorted by ID.
+	for i := 1; i < len(all); i++ {
+		if all[i].ID < all[i-1].ID {
+			t.Errorf("modules not sorted: %s before %s", all[i-1].ID, all[i].ID)
+		}
+	}
+}
+
+func TestValidateDependencies(t *testing.T) {
+	r := NewRegistry()
+
+	// Default state should be valid.
+	if err := r.ValidateDependencies(); err != nil {
+		t.Fatalf("default state should be valid: %v", err)
+	}
+
+	// Force an invalid state by directly mutating (bypassing SetEnabled).
+	r.mu.Lock()
+	r.modules[Jobs].enabled = true
+	r.modules[Auth].enabled = false
+	r.mu.Unlock()
+
+	if err := r.ValidateDependencies(); err == nil {
+		t.Error("should detect jobs enabled without auth")
+	}
+}

internal/storage/filesystem.go

@@ -0,0 +1,177 @@
+package storage
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// ErrPresignNotSupported is returned when presigned URLs are requested from a
+// backend that does not support them.
+var ErrPresignNotSupported = errors.New("presigned URLs not supported by filesystem backend")
+
+// Compile-time check: *FilesystemStore implements FileStore.
+var _ FileStore = (*FilesystemStore)(nil)
+
+// FilesystemStore stores objects as files under a root directory.
+type FilesystemStore struct {
+	root string // absolute path
+}
+
+// NewFilesystemStore creates a new filesystem-backed store rooted at root.
+// The directory is created if it does not exist.
+func NewFilesystemStore(root string) (*FilesystemStore, error) {
+	abs, err := filepath.Abs(root)
+	if err != nil {
+		return nil, fmt.Errorf("resolving root path: %w", err)
+	}
+	if err := os.MkdirAll(abs, 0o755); err != nil {
+		return nil, fmt.Errorf("creating root directory: %w", err)
+	}
+	return &FilesystemStore{root: abs}, nil
+}
+
+// path returns the absolute filesystem path for a storage key.
+func (fs *FilesystemStore) path(key string) string {
+	return filepath.Join(fs.root, filepath.FromSlash(key))
+}
+
+// Put writes reader to the file at key using atomic rename.
+// SHA-256 checksum is computed during write and returned in PutResult.
+func (fs *FilesystemStore) Put(_ context.Context, key string, reader io.Reader, _ int64, _ string) (*PutResult, error) {
+	dest := fs.path(key)
+
+	if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
+		return nil, fmt.Errorf("creating directories: %w", err)
+	}
+
+	// Write to a temp file in the same directory so os.Rename is atomic.
+	tmp, err := os.CreateTemp(filepath.Dir(dest), ".silo-tmp-*")
+	if err != nil {
+		return nil, fmt.Errorf("creating temp file: %w", err)
+	}
+	tmpPath := tmp.Name()
+	defer func() {
+		// Clean up temp file on any failure path.
+		tmp.Close()
+		os.Remove(tmpPath)
+	}()
+
+	h := sha256.New()
+	w := io.MultiWriter(tmp, h)
+
+	n, err := io.Copy(w, reader)
+	if err != nil {
+		return nil, fmt.Errorf("writing file: %w", err)
+	}
+	if err := tmp.Close(); err != nil {
+		return nil, fmt.Errorf("closing temp file: %w", err)
+	}
+
+	if err := os.Rename(tmpPath, dest); err != nil {
+		return nil, fmt.Errorf("renaming temp file: %w", err)
+	}
+
+	return &PutResult{
+		Key:      key,
+		Size:     n,
+		Checksum: hex.EncodeToString(h.Sum(nil)),
+	}, nil
+}
+
+// Get opens the file at key for reading.
+func (fs *FilesystemStore) Get(_ context.Context, key string) (io.ReadCloser, error) {
+	f, err := os.Open(fs.path(key))
+	if err != nil {
+		return nil, fmt.Errorf("opening file: %w", err)
+	}
+	return f, nil
+}
+
+// GetVersion delegates to Get — filesystem storage has no versioning.
+func (fs *FilesystemStore) GetVersion(ctx context.Context, key string, _ string) (io.ReadCloser, error) {
+	return fs.Get(ctx, key)
+}
+
+// Delete removes the file at key. No error if already absent.
+func (fs *FilesystemStore) Delete(_ context.Context, key string) error {
+	err := os.Remove(fs.path(key))
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		return fmt.Errorf("removing file: %w", err)
+	}
+	return nil
+}
+
+// Exists reports whether the file at key exists.
+func (fs *FilesystemStore) Exists(_ context.Context, key string) (bool, error) {
+	_, err := os.Stat(fs.path(key))
+	if err == nil {
+		return true, nil
+	}
+	if errors.Is(err, os.ErrNotExist) {
+		return false, nil
+	}
+	return false, fmt.Errorf("checking file: %w", err)
+}
+
+// Copy duplicates a file from srcKey to dstKey using atomic rename.
+func (fs *FilesystemStore) Copy(_ context.Context, srcKey, dstKey string) error {
+	srcPath := fs.path(srcKey)
+	dstPath := fs.path(dstKey)
+
+	src, err := os.Open(srcPath)
+	if err != nil {
+		return fmt.Errorf("opening source: %w", err)
+	}
+	defer src.Close()
+
+	if err := os.MkdirAll(filepath.Dir(dstPath), 0o755); err != nil {
+		return fmt.Errorf("creating directories: %w", err)
+	}
+
+	tmp, err := os.CreateTemp(filepath.Dir(dstPath), ".silo-tmp-*")
+	if err != nil {
+		return fmt.Errorf("creating temp file: %w", err)
+	}
+	tmpPath := tmp.Name()
+	defer func() {
+		tmp.Close()
+		os.Remove(tmpPath)
+	}()
+
+	if _, err := io.Copy(tmp, src); err != nil {
+		return fmt.Errorf("copying file: %w", err)
+	}
+	if err := tmp.Close(); err != nil {
+		return fmt.Errorf("closing temp file: %w", err)
+	}
+
+	if err := os.Rename(tmpPath, dstPath); err != nil {
+		return fmt.Errorf("renaming temp file: %w", err)
+	}
+	return nil
+}
+
+// PresignPut is not supported by the filesystem backend.
+func (fs *FilesystemStore) PresignPut(_ context.Context, _ string, _ time.Duration) (*url.URL, error) {
+	return nil, ErrPresignNotSupported
+}
+
+// Ping verifies the root directory is accessible and writable.
+func (fs *FilesystemStore) Ping(_ context.Context) error {
+	tmp, err := os.CreateTemp(fs.root, ".silo-ping-*")
+	if err != nil {
+		return fmt.Errorf("storage ping failed: %w", err)
+	}
+	name := tmp.Name()
+	tmp.Close()
+	os.Remove(name)
+	return nil
+}

internal/storage/filesystem_test.go

@@ -0,0 +1,277 @@
+package storage
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func newTestStore(t *testing.T) *FilesystemStore {
+	t.Helper()
+	fs, err := NewFilesystemStore(t.TempDir())
+	if err != nil {
+		t.Fatalf("NewFilesystemStore: %v", err)
+	}
+	return fs
+}
+
+func TestNewFilesystemStore(t *testing.T) {
+	dir := t.TempDir()
+	sub := filepath.Join(dir, "a", "b")
+	fs, err := NewFilesystemStore(sub)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !filepath.IsAbs(fs.root) {
+		t.Errorf("root is not absolute: %s", fs.root)
+	}
+	info, err := os.Stat(sub)
+	if err != nil {
+		t.Fatalf("root dir missing: %v", err)
+	}
+	if !info.IsDir() {
+		t.Error("root is not a directory")
+	}
+}
+
+func TestPut(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+	data := []byte("hello world")
+	h := sha256.Sum256(data)
+	wantChecksum := hex.EncodeToString(h[:])
+
+	result, err := fs.Put(ctx, "items/P001/rev1.FCStd", bytes.NewReader(data), int64(len(data)), "application/octet-stream")
+	if err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+	if result.Key != "items/P001/rev1.FCStd" {
+		t.Errorf("Key = %q, want %q", result.Key, "items/P001/rev1.FCStd")
+	}
+	if result.Size != int64(len(data)) {
+		t.Errorf("Size = %d, want %d", result.Size, len(data))
+	}
+	if result.Checksum != wantChecksum {
+		t.Errorf("Checksum = %q, want %q", result.Checksum, wantChecksum)
+	}
+
+	// Verify file on disk.
+	got, err := os.ReadFile(fs.path("items/P001/rev1.FCStd"))
+	if err != nil {
+		t.Fatalf("reading file: %v", err)
+	}
+	if !bytes.Equal(got, data) {
+		t.Error("file content mismatch")
+	}
+}
+
+func TestPutAtomicity(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+	key := "test/atomic.bin"
+
+	// Write an initial file.
+	if _, err := fs.Put(ctx, key, strings.NewReader("original"), 8, ""); err != nil {
+		t.Fatalf("initial Put: %v", err)
+	}
+
+	// Write with a reader that fails partway through.
+	failing := io.MultiReader(strings.NewReader("partial"), &errReader{})
+	_, err := fs.Put(ctx, key, failing, 100, "")
+	if err == nil {
+		t.Fatal("expected error from failing reader")
+	}
+
+	// Original file should still be intact.
+	got, err := os.ReadFile(fs.path(key))
+	if err != nil {
+		t.Fatalf("reading file after failed put: %v", err)
+	}
+	if string(got) != "original" {
+		t.Errorf("file content = %q, want %q", got, "original")
+	}
+}
+
+type errReader struct{}
+
+func (e *errReader) Read([]byte) (int, error) {
+	return 0, io.ErrUnexpectedEOF
+}
+
+func TestGet(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+	data := []byte("test content")
+
+	if _, err := fs.Put(ctx, "f.txt", bytes.NewReader(data), int64(len(data)), ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+
+	rc, err := fs.Get(ctx, "f.txt")
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	defer rc.Close()
+
+	got, err := io.ReadAll(rc)
+	if err != nil {
+		t.Fatalf("ReadAll: %v", err)
+	}
+	if !bytes.Equal(got, data) {
+		t.Error("content mismatch")
+	}
+}
+
+func TestGetMissing(t *testing.T) {
+	fs := newTestStore(t)
+	_, err := fs.Get(context.Background(), "no/such/file")
+	if err == nil {
+		t.Fatal("expected error for missing file")
+	}
+}
+
+func TestGetVersion(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+	data := []byte("versioned")
+
+	if _, err := fs.Put(ctx, "v.txt", bytes.NewReader(data), int64(len(data)), ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+
+	// GetVersion ignores versionID, returns same file.
+	rc, err := fs.GetVersion(ctx, "v.txt", "ignored-version-id")
+	if err != nil {
+		t.Fatalf("GetVersion: %v", err)
+	}
+	defer rc.Close()
+
+	got, err := io.ReadAll(rc)
+	if err != nil {
+		t.Fatalf("ReadAll: %v", err)
+	}
+	if !bytes.Equal(got, data) {
+		t.Error("content mismatch")
+	}
+}
+
+func TestDelete(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+
+	if _, err := fs.Put(ctx, "del.txt", strings.NewReader("x"), 1, ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+
+	if err := fs.Delete(ctx, "del.txt"); err != nil {
+		t.Fatalf("Delete: %v", err)
+	}
+
+	if _, err := os.Stat(fs.path("del.txt")); !os.IsNotExist(err) {
+		t.Error("file still exists after delete")
+	}
+}
+
+func TestDeleteMissing(t *testing.T) {
+	fs := newTestStore(t)
+	if err := fs.Delete(context.Background(), "no/such/file"); err != nil {
+		t.Fatalf("Delete missing file should not error: %v", err)
+	}
+}
+
+func TestExists(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+
+	ok, err := fs.Exists(ctx, "nope")
+	if err != nil {
+		t.Fatalf("Exists: %v", err)
+	}
+	if ok {
+		t.Error("Exists returned true for missing file")
+	}
+
+	if _, err := fs.Put(ctx, "yes.txt", strings.NewReader("y"), 1, ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+
+	ok, err = fs.Exists(ctx, "yes.txt")
+	if err != nil {
+		t.Fatalf("Exists: %v", err)
+	}
+	if !ok {
+		t.Error("Exists returned false for existing file")
+	}
+}
+
+func TestCopy(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+	data := []byte("copy me")
+
+	if _, err := fs.Put(ctx, "src.bin", bytes.NewReader(data), int64(len(data)), ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+
+	if err := fs.Copy(ctx, "src.bin", "deep/nested/dst.bin"); err != nil {
+		t.Fatalf("Copy: %v", err)
+	}
+
+	got, err := os.ReadFile(fs.path("deep/nested/dst.bin"))
+	if err != nil {
+		t.Fatalf("reading copied file: %v", err)
+	}
+	if !bytes.Equal(got, data) {
+		t.Error("copied content mismatch")
+	}
+
+	// Source should still exist.
+	if _, err := os.Stat(fs.path("src.bin")); err != nil {
+		t.Error("source file missing after copy")
+	}
+}
+
+func TestPresignPut(t *testing.T) {
+	fs := newTestStore(t)
+	_, err := fs.PresignPut(context.Background(), "key", 5*60)
+	if err != ErrPresignNotSupported {
+		t.Errorf("PresignPut error = %v, want ErrPresignNotSupported", err)
+	}
+}
+
+func TestPing(t *testing.T) {
+	fs := newTestStore(t)
+	if err := fs.Ping(context.Background()); err != nil {
+		t.Fatalf("Ping: %v", err)
+	}
+}
+
+func TestPingBadRoot(t *testing.T) {
+	fs := &FilesystemStore{root: "/nonexistent/path/that/should/not/exist"}
+	if err := fs.Ping(context.Background()); err == nil {
+		t.Fatal("expected Ping to fail with invalid root")
+	}
+}
+
+func TestPutOverwrite(t *testing.T) {
+	fs := newTestStore(t)
+	ctx := context.Background()
+
+	if _, err := fs.Put(ctx, "ow.txt", strings.NewReader("first"), 5, ""); err != nil {
+		t.Fatalf("Put: %v", err)
+	}
+	if _, err := fs.Put(ctx, "ow.txt", strings.NewReader("second"), 6, ""); err != nil {
+		t.Fatalf("Put overwrite: %v", err)
+	}
+
+	got, _ := os.ReadFile(fs.path("ow.txt"))
+	if string(got) != "second" {
+		t.Errorf("content = %q, want %q", got, "second")
+	}
+}

internal/storage/interface.go

@@ -0,0 +1,40 @@
+// Package storage defines the FileStore interface and backend implementations.
+package storage
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/url"
+	"time"
+)
+
+// FileStore is the interface for file storage backends.
+type FileStore interface {
+	Put(ctx context.Context, key string, reader io.Reader, size int64, contentType string) (*PutResult, error)
+	Get(ctx context.Context, key string) (io.ReadCloser, error)
+	GetVersion(ctx context.Context, key string, versionID string) (io.ReadCloser, error)
+	Delete(ctx context.Context, key string) error
+	Exists(ctx context.Context, key string) (bool, error)
+	Copy(ctx context.Context, srcKey, dstKey string) error
+	PresignPut(ctx context.Context, key string, expiry time.Duration) (*url.URL, error)
+	Ping(ctx context.Context) error
+}
+
+// PutResult contains the result of a put operation.
+type PutResult struct {
+	Key       string
+	VersionID string
+	Size      int64
+	Checksum  string
+}
+
+// FileKey generates a storage key for an item file.
+func FileKey(partNumber string, revision int) string {
+	return fmt.Sprintf("items/%s/rev%d.FCStd", partNumber, revision)
+}
+
+// ThumbnailKey generates a storage key for a thumbnail.
+func ThumbnailKey(partNumber string, revision int) string {
+	return fmt.Sprintf("thumbnails/%s/rev%d.png", partNumber, revision)
+}

internal/storage/storage.go

@@ -1,159 +0,0 @@
-// Package storage provides MinIO file storage operations.
-package storage
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"net/url"
-	"time"
-
-	"github.com/minio/minio-go/v7"
-	"github.com/minio/minio-go/v7/pkg/credentials"
-)
-
-// Config holds MinIO connection settings.
-type Config struct {
-	Endpoint  string
-	AccessKey string
-	SecretKey string
-	Bucket    string
-	UseSSL    bool
-	Region    string
-}
-
-// Storage wraps MinIO client operations.
-type Storage struct {
-	client *minio.Client
-	bucket string
-}
-
-// Connect creates a new MinIO storage client.
-func Connect(ctx context.Context, cfg Config) (*Storage, error) {
-	client, err := minio.New(cfg.Endpoint, &minio.Options{
-		Creds:  credentials.NewStaticV4(cfg.AccessKey, cfg.SecretKey, ""),
-		Secure: cfg.UseSSL,
-		Region: cfg.Region,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("creating minio client: %w", err)
-	}
-
-	// Ensure bucket exists with versioning
-	exists, err := client.BucketExists(ctx, cfg.Bucket)
-	if err != nil {
-		return nil, fmt.Errorf("checking bucket: %w", err)
-	}
-	if !exists {
-		if err := client.MakeBucket(ctx, cfg.Bucket, minio.MakeBucketOptions{
-			Region: cfg.Region,
-		}); err != nil {
-			return nil, fmt.Errorf("creating bucket: %w", err)
-		}
-		// Enable versioning
-		if err := client.EnableVersioning(ctx, cfg.Bucket); err != nil {
-			return nil, fmt.Errorf("enabling versioning: %w", err)
-		}
-	}
-
-	return &Storage{client: client, bucket: cfg.Bucket}, nil
-}
-
-// PutResult contains the result of a put operation.
-type PutResult struct {
-	Key       string
-	VersionID string
-	Size      int64
-	Checksum  string
-}
-
-// Put uploads a file to storage.
-func (s *Storage) Put(ctx context.Context, key string, reader io.Reader, size int64, contentType string) (*PutResult, error) {
-	info, err := s.client.PutObject(ctx, s.bucket, key, reader, size, minio.PutObjectOptions{
-		ContentType: contentType,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("uploading object: %w", err)
-	}
-
-	return &PutResult{
-		Key:       key,
-		VersionID: info.VersionID,
-		Size:      info.Size,
-		Checksum:  info.ChecksumSHA256,
-	}, nil
-}
-
-// Get downloads a file from storage.
-func (s *Storage) Get(ctx context.Context, key string) (io.ReadCloser, error) {
-	obj, err := s.client.GetObject(ctx, s.bucket, key, minio.GetObjectOptions{})
-	if err != nil {
-		return nil, fmt.Errorf("getting object: %w", err)
-	}
-	return obj, nil
-}
-
-// GetVersion downloads a specific version of a file.
-func (s *Storage) GetVersion(ctx context.Context, key, versionID string) (io.ReadCloser, error) {
-	obj, err := s.client.GetObject(ctx, s.bucket, key, minio.GetObjectOptions{
-		VersionID: versionID,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("getting object version: %w", err)
-	}
-	return obj, nil
-}
-
-// Delete removes a file from storage.
-func (s *Storage) Delete(ctx context.Context, key string) error {
-	if err := s.client.RemoveObject(ctx, s.bucket, key, minio.RemoveObjectOptions{}); err != nil {
-		return fmt.Errorf("removing object: %w", err)
-	}
-	return nil
-}
-
-// Ping checks if the storage backend is reachable by verifying the bucket exists.
-func (s *Storage) Ping(ctx context.Context) error {
-	_, err := s.client.BucketExists(ctx, s.bucket)
-	return err
-}
-
-// Bucket returns the bucket name.
-func (s *Storage) Bucket() string {
-	return s.bucket
-}
-
-// PresignPut generates a presigned PUT URL for direct browser upload.
-func (s *Storage) PresignPut(ctx context.Context, key string, expiry time.Duration) (*url.URL, error) {
-	u, err := s.client.PresignedPutObject(ctx, s.bucket, key, expiry)
-	if err != nil {
-		return nil, fmt.Errorf("generating presigned put URL: %w", err)
-	}
-	return u, nil
-}
-
-// Copy copies an object within the same bucket from srcKey to dstKey.
-func (s *Storage) Copy(ctx context.Context, srcKey, dstKey string) error {
-	src := minio.CopySrcOptions{
-		Bucket: s.bucket,
-		Object: srcKey,
-	}
-	dst := minio.CopyDestOptions{
-		Bucket: s.bucket,
-		Object: dstKey,
-	}
-	if _, err := s.client.CopyObject(ctx, dst, src); err != nil {
-		return fmt.Errorf("copying object: %w", err)
-	}
-	return nil
-}
-
-// FileKey generates a storage key for an item file.
-func FileKey(partNumber string, revision int) string {
-	return fmt.Sprintf("items/%s/rev%d.FCStd", partNumber, revision)
-}
-
-// ThumbnailKey generates a storage key for a thumbnail.
-func ThumbnailKey(partNumber string, revision int) string {
-	return fmt.Sprintf("thumbnails/%s/rev%d.png", partNumber, revision)
-}

internal/testutil/testutil.go

@@ -3,7 +3,6 @@ package testutil
 
 import (
 	"context"
-	"fmt"
 	"os"
 	"path/filepath"
 	"sort"
@@ -80,9 +79,13 @@ func TruncateAll(t *testing.T, pool *pgxpool.Pool) {
 
 	_, err := pool.Exec(context.Background(), `
 		TRUNCATE
+			item_metadata, item_dependencies, approval_signatures, item_approvals, item_macros,
+			settings_overrides, module_state,
+			job_log, jobs, job_definitions, runners,
+			dag_cross_edges, dag_edges, dag_nodes,
 			audit_log, sync_log, api_tokens, sessions, item_files,
 			item_projects, relationships, revisions, inventory, items,
-			projects, sequences_by_name, users, property_migrations
+			locations, projects, sequences_by_name, users, property_migrations
 		CASCADE
 	`)
 	if err != nil {
@@ -109,6 +112,4 @@ func findProjectRoot(t *testing.T) string {
 		}
 		dir = parent
 	}
-
-	panic(fmt.Sprintf("unreachable"))
 }

internal/workflow/workflow.go

@@ -0,0 +1,156 @@
+// Package workflow handles YAML approval workflow definition parsing and validation.
+package workflow
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Workflow represents an approval workflow definition loaded from YAML.
+type Workflow struct {
+	Name        string   `yaml:"name" json:"name"`
+	Version     int      `yaml:"version" json:"version"`
+	Description string   `yaml:"description" json:"description"`
+	States      []string `yaml:"states" json:"states"`
+	Gates       []Gate   `yaml:"gates" json:"gates"`
+	Rules       Rules    `yaml:"rules" json:"rules"`
+}
+
+// Gate defines a required or optional signature role in a workflow.
+type Gate struct {
+	Role     string `yaml:"role" json:"role"`
+	Label    string `yaml:"label" json:"label"`
+	Required bool   `yaml:"required" json:"required"`
+}
+
+// Rules defines how signatures determine state transitions.
+type Rules struct {
+	AnyReject          string `yaml:"any_reject" json:"any_reject"`
+	AllRequiredApprove string `yaml:"all_required_approve" json:"all_required_approve"`
+}
+
+// WorkflowFile wraps a workflow for YAML parsing.
+type WorkflowFile struct {
+	Workflow Workflow `yaml:"workflow"`
+}
+
+var requiredStates = []string{"draft", "pending", "approved", "rejected"}
+
+// Load reads a workflow definition from a YAML file.
+func Load(path string) (*Workflow, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading workflow file: %w", err)
+	}
+
+	var wf WorkflowFile
+	if err := yaml.Unmarshal(data, &wf); err != nil {
+		return nil, fmt.Errorf("parsing workflow YAML: %w", err)
+	}
+
+	w := &wf.Workflow
+
+	if w.Version <= 0 {
+		w.Version = 1
+	}
+
+	if err := w.Validate(); err != nil {
+		return nil, fmt.Errorf("validating %s: %w", path, err)
+	}
+
+	return w, nil
+}
+
+// LoadAll reads all workflow definitions from a directory.
+func LoadAll(dir string) (map[string]*Workflow, error) {
+	workflows := make(map[string]*Workflow)
+
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return nil, fmt.Errorf("reading workflows directory: %w", err)
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if !strings.HasSuffix(entry.Name(), ".yaml") && !strings.HasSuffix(entry.Name(), ".yml") {
+			continue
+		}
+
+		path := filepath.Join(dir, entry.Name())
+		w, err := Load(path)
+		if err != nil {
+			return nil, fmt.Errorf("loading %s: %w", entry.Name(), err)
+		}
+		workflows[w.Name] = w
+	}
+
+	return workflows, nil
+}
+
+// Validate checks that the workflow definition is well-formed.
+func (w *Workflow) Validate() error {
+	if w.Name == "" {
+		return fmt.Errorf("workflow name is required")
+	}
+
+	// Validate states include all required states
+	stateSet := make(map[string]bool, len(w.States))
+	for _, s := range w.States {
+		stateSet[s] = true
+	}
+	for _, rs := range requiredStates {
+		if !stateSet[rs] {
+			return fmt.Errorf("workflow must include state %q", rs)
+		}
+	}
+
+	// Validate gates
+	if len(w.Gates) == 0 {
+		return fmt.Errorf("workflow must have at least one gate")
+	}
+	for i, g := range w.Gates {
+		if g.Role == "" {
+			return fmt.Errorf("gate %d: role is required", i)
+		}
+		if g.Label == "" {
+			return fmt.Errorf("gate %d: label is required", i)
+		}
+	}
+
+	// Validate rules reference valid states
+	if w.Rules.AnyReject != "" && !stateSet[w.Rules.AnyReject] {
+		return fmt.Errorf("rules.any_reject references unknown state %q", w.Rules.AnyReject)
+	}
+	if w.Rules.AllRequiredApprove != "" && !stateSet[w.Rules.AllRequiredApprove] {
+		return fmt.Errorf("rules.all_required_approve references unknown state %q", w.Rules.AllRequiredApprove)
+	}
+
+	return nil
+}
+
+// RequiredGates returns only the gates where Required is true.
+func (w *Workflow) RequiredGates() []Gate {
+	var gates []Gate
+	for _, g := range w.Gates {
+		if g.Required {
+			gates = append(gates, g)
+		}
+	}
+	return gates
+}
+
+// HasRole returns true if the workflow defines a gate with the given role.
+func (w *Workflow) HasRole(role string) bool {
+	for _, g := range w.Gates {
+		if g.Role == role {
+			return true
+		}
+	}
+	return false
+}

internal/workflow/workflow_test.go

@@ -0,0 +1,167 @@
+package workflow
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoad_Valid(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "test.yaml")
+	os.WriteFile(path, []byte(`
+workflow:
+  name: test-wf
+  version: 1
+  description: "Test workflow"
+  states: [draft, pending, approved, rejected]
+  gates:
+    - role: reviewer
+      label: "Review"
+      required: true
+  rules:
+    any_reject: rejected
+    all_required_approve: approved
+`), 0644)
+
+	w, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load() error: %v", err)
+	}
+	if w.Name != "test-wf" {
+		t.Errorf("Name = %q, want %q", w.Name, "test-wf")
+	}
+	if w.Version != 1 {
+		t.Errorf("Version = %d, want 1", w.Version)
+	}
+	if len(w.Gates) != 1 {
+		t.Fatalf("Gates count = %d, want 1", len(w.Gates))
+	}
+	if w.Gates[0].Role != "reviewer" {
+		t.Errorf("Gates[0].Role = %q, want %q", w.Gates[0].Role, "reviewer")
+	}
+}
+
+func TestLoad_MissingState(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "bad.yaml")
+	os.WriteFile(path, []byte(`
+workflow:
+  name: bad
+  states: [draft, pending]
+  gates:
+    - role: r
+      label: "R"
+      required: true
+`), 0644)
+
+	_, err := Load(path)
+	if err == nil {
+		t.Fatal("expected error for missing required states")
+	}
+}
+
+func TestLoad_NoGates(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "no-gates.yaml")
+	os.WriteFile(path, []byte(`
+workflow:
+  name: no-gates
+  states: [draft, pending, approved, rejected]
+  gates: []
+`), 0644)
+
+	_, err := Load(path)
+	if err == nil {
+		t.Fatal("expected error for no gates")
+	}
+}
+
+func TestLoadAll(t *testing.T) {
+	dir := t.TempDir()
+
+	os.WriteFile(filepath.Join(dir, "a.yaml"), []byte(`
+workflow:
+  name: alpha
+  states: [draft, pending, approved, rejected]
+  gates:
+    - role: r
+      label: "R"
+      required: true
+  rules:
+    any_reject: rejected
+    all_required_approve: approved
+`), 0644)
+
+	os.WriteFile(filepath.Join(dir, "b.yml"), []byte(`
+workflow:
+  name: beta
+  states: [draft, pending, approved, rejected]
+  gates:
+    - role: r
+      label: "R"
+      required: true
+  rules:
+    any_reject: rejected
+`), 0644)
+
+	// Non-yaml file should be ignored
+	os.WriteFile(filepath.Join(dir, "readme.txt"), []byte("ignore me"), 0644)
+
+	wfs, err := LoadAll(dir)
+	if err != nil {
+		t.Fatalf("LoadAll() error: %v", err)
+	}
+	if len(wfs) != 2 {
+		t.Fatalf("LoadAll() count = %d, want 2", len(wfs))
+	}
+	if wfs["alpha"] == nil {
+		t.Error("missing workflow 'alpha'")
+	}
+	if wfs["beta"] == nil {
+		t.Error("missing workflow 'beta'")
+	}
+}
+
+func TestRequiredGates(t *testing.T) {
+	w := &Workflow{
+		Gates: []Gate{
+			{Role: "engineer", Label: "Eng", Required: true},
+			{Role: "quality", Label: "QA", Required: false},
+			{Role: "manager", Label: "Mgr", Required: true},
+		},
+	}
+	rg := w.RequiredGates()
+	if len(rg) != 2 {
+		t.Fatalf("RequiredGates() count = %d, want 2", len(rg))
+	}
+	if rg[0].Role != "engineer" || rg[1].Role != "manager" {
+		t.Errorf("RequiredGates() roles = %v, want [engineer, manager]", rg)
+	}
+}
+
+func TestHasRole(t *testing.T) {
+	w := &Workflow{
+		Gates: []Gate{
+			{Role: "engineer", Label: "Eng", Required: true},
+		},
+	}
+	if !w.HasRole("engineer") {
+		t.Error("HasRole(engineer) = false, want true")
+	}
+	if w.HasRole("manager") {
+		t.Error("HasRole(manager) = true, want false")
+	}
+}
+
+func TestValidate_InvalidRuleState(t *testing.T) {
+	w := &Workflow{
+		Name:   "bad-rule",
+		States: []string{"draft", "pending", "approved", "rejected"},
+		Gates:  []Gate{{Role: "r", Label: "R", Required: true}},
+		Rules:  Rules{AnyReject: "nonexistent"},
+	}
+	if err := w.Validate(); err == nil {
+		t.Fatal("expected error for invalid rule state reference")
+	}
+}

jobdefs/assembly-kinematic.yaml

@@ -0,0 +1,23 @@
+job:
+  name: assembly-kinematic
+  version: 1
+  description: "Run kinematic simulation"
+
+  trigger:
+    type: manual
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-kinematic
+    args:
+      operation: kinematic
+
+  runner:
+    tags: [solver]
+
+  timeout: 1800
+  max_retries: 0
+  priority: 100

jobdefs/assembly-solve.yaml

@@ -0,0 +1,21 @@
+job:
+  name: assembly-solve
+  version: 1
+  description: "Solve assembly constraints on server"
+
+  trigger:
+    type: manual
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-run
+
+  runner:
+    tags: [solver]
+
+  timeout: 300
+  max_retries: 1
+  priority: 50

jobdefs/assembly-validate.yaml

@@ -0,0 +1,25 @@
+job:
+  name: assembly-validate
+  version: 1
+  description: "Validate assembly constraints on commit"
+
+  trigger:
+    type: revision_created
+    filter:
+      item_type: assembly
+
+  scope:
+    type: assembly
+
+  compute:
+    type: custom
+    command: solver-diagnose
+    args:
+      operation: diagnose
+
+  runner:
+    tags: [solver]
+
+  timeout: 120
+  max_retries: 2
+  priority: 75

jobdefs/part-export-step.yaml

@@ -0,0 +1,24 @@
+job:
+  name: part-export-step
+  version: 1
+  description: "Export a part to STEP format"
+
+  trigger:
+    type: manual
+
+  scope:
+    type: item
+
+  compute:
+    type: export
+    command: create-export
+    args:
+      format: step
+      output_key_template: "exports/{part_number}_rev{revision}.step"
+
+  runner:
+    tags: [create]
+
+  timeout: 300
+  max_retries: 1
+  priority: 100

migrations/014_dag_nodes_edges.sql

@@ -0,0 +1,67 @@
+-- Dependency DAG: feature-level nodes and edges within items.
+-- Migration: 014_dag_nodes_edges
+-- Date: 2026-02
+
+BEGIN;
+
+--------------------------------------------------------------------------------
+-- DAG Nodes (feature-level nodes within an item's revision)
+--------------------------------------------------------------------------------
+
+CREATE TABLE dag_nodes (
+    id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id          UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    revision_number  INTEGER NOT NULL,
+    node_key         TEXT NOT NULL,
+    node_type        TEXT NOT NULL,
+    properties_hash  TEXT,
+    validation_state TEXT NOT NULL DEFAULT 'clean',
+    validation_msg   TEXT,
+    metadata         JSONB DEFAULT '{}',
+    created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE(item_id, revision_number, node_key)
+);
+
+CREATE INDEX idx_dag_nodes_item ON dag_nodes(item_id);
+CREATE INDEX idx_dag_nodes_item_rev ON dag_nodes(item_id, revision_number);
+CREATE INDEX idx_dag_nodes_state ON dag_nodes(validation_state)
+    WHERE validation_state != 'clean';
+CREATE INDEX idx_dag_nodes_type ON dag_nodes(node_type);
+
+--------------------------------------------------------------------------------
+-- DAG Edges (dependencies between nodes within a single item)
+-- Direction: source → target means "target depends on source"
+--------------------------------------------------------------------------------
+
+CREATE TABLE dag_edges (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    source_node_id  UUID NOT NULL REFERENCES dag_nodes(id) ON DELETE CASCADE,
+    target_node_id  UUID NOT NULL REFERENCES dag_nodes(id) ON DELETE CASCADE,
+    edge_type       TEXT NOT NULL DEFAULT 'depends_on',
+    metadata        JSONB DEFAULT '{}',
+    UNIQUE(source_node_id, target_node_id, edge_type),
+    CONSTRAINT no_self_edge CHECK (source_node_id != target_node_id)
+);
+
+CREATE INDEX idx_dag_edges_source ON dag_edges(source_node_id);
+CREATE INDEX idx_dag_edges_target ON dag_edges(target_node_id);
+
+--------------------------------------------------------------------------------
+-- Cross-item DAG edges (linking feature nodes across BOM boundaries)
+--------------------------------------------------------------------------------
+
+CREATE TABLE dag_cross_edges (
+    id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    source_node_id   UUID NOT NULL REFERENCES dag_nodes(id) ON DELETE CASCADE,
+    target_node_id   UUID NOT NULL REFERENCES dag_nodes(id) ON DELETE CASCADE,
+    relationship_id  UUID REFERENCES relationships(id) ON DELETE SET NULL,
+    edge_type        TEXT NOT NULL DEFAULT 'assembly_ref',
+    metadata         JSONB DEFAULT '{}',
+    UNIQUE(source_node_id, target_node_id)
+);
+
+CREATE INDEX idx_dag_cross_source ON dag_cross_edges(source_node_id);
+CREATE INDEX idx_dag_cross_target ON dag_cross_edges(target_node_id);
+
+COMMIT;

migrations/015_jobs_runners.sql

@@ -0,0 +1,109 @@
+-- Worker system: runners, job definitions, jobs, and job log.
+-- Migration: 015_jobs_runners
+-- Date: 2026-02
+
+BEGIN;
+
+--------------------------------------------------------------------------------
+-- Runners (registered compute workers)
+--------------------------------------------------------------------------------
+
+CREATE TABLE runners (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name            TEXT UNIQUE NOT NULL,
+    token_hash      TEXT NOT NULL,
+    token_prefix    TEXT NOT NULL,
+    tags            TEXT[] NOT NULL DEFAULT '{}',
+    status          TEXT NOT NULL DEFAULT 'offline',
+    last_heartbeat  TIMESTAMPTZ,
+    last_job_id     UUID,
+    metadata        JSONB DEFAULT '{}',
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_runners_status ON runners(status);
+CREATE INDEX idx_runners_token ON runners(token_hash);
+
+--------------------------------------------------------------------------------
+-- Job Definitions (parsed from YAML, stored for reference and FK)
+--------------------------------------------------------------------------------
+
+CREATE TABLE job_definitions (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name            TEXT UNIQUE NOT NULL,
+    version         INTEGER NOT NULL DEFAULT 1,
+    trigger_type    TEXT NOT NULL,
+    scope_type      TEXT NOT NULL,
+    compute_type    TEXT NOT NULL,
+    runner_tags     TEXT[] NOT NULL DEFAULT '{}',
+    timeout_seconds INTEGER NOT NULL DEFAULT 600,
+    max_retries     INTEGER NOT NULL DEFAULT 1,
+    priority        INTEGER NOT NULL DEFAULT 100,
+    definition      JSONB NOT NULL,
+    enabled         BOOLEAN NOT NULL DEFAULT true,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_job_defs_trigger ON job_definitions(trigger_type);
+CREATE INDEX idx_job_defs_enabled ON job_definitions(enabled) WHERE enabled = true;
+
+--------------------------------------------------------------------------------
+-- Jobs (individual compute job instances)
+--------------------------------------------------------------------------------
+
+CREATE TYPE job_status AS ENUM (
+    'pending', 'claimed', 'running', 'completed', 'failed', 'cancelled'
+);
+
+CREATE TABLE jobs (
+    id                UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    job_definition_id UUID REFERENCES job_definitions(id) ON DELETE SET NULL,
+    definition_name   TEXT NOT NULL,
+    status            job_status NOT NULL DEFAULT 'pending',
+    priority          INTEGER NOT NULL DEFAULT 100,
+    item_id           UUID REFERENCES items(id) ON DELETE CASCADE,
+    project_id        UUID REFERENCES projects(id) ON DELETE SET NULL,
+    scope_metadata    JSONB DEFAULT '{}',
+    runner_id         UUID REFERENCES runners(id) ON DELETE SET NULL,
+    runner_tags       TEXT[] NOT NULL DEFAULT '{}',
+    created_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+    claimed_at        TIMESTAMPTZ,
+    started_at        TIMESTAMPTZ,
+    completed_at      TIMESTAMPTZ,
+    timeout_seconds   INTEGER NOT NULL DEFAULT 600,
+    expires_at        TIMESTAMPTZ,
+    progress          INTEGER DEFAULT 0,
+    progress_message  TEXT,
+    result            JSONB,
+    error_message     TEXT,
+    retry_count       INTEGER NOT NULL DEFAULT 0,
+    max_retries       INTEGER NOT NULL DEFAULT 1,
+    created_by        TEXT,
+    cancelled_by      TEXT
+);
+
+CREATE INDEX idx_jobs_status ON jobs(status);
+CREATE INDEX idx_jobs_pending ON jobs(status, priority, created_at)
+    WHERE status = 'pending';
+CREATE INDEX idx_jobs_item ON jobs(item_id);
+CREATE INDEX idx_jobs_runner ON jobs(runner_id);
+CREATE INDEX idx_jobs_definition ON jobs(job_definition_id);
+
+--------------------------------------------------------------------------------
+-- Job Log (append-only progress entries)
+--------------------------------------------------------------------------------
+
+CREATE TABLE job_log (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    job_id     UUID NOT NULL REFERENCES jobs(id) ON DELETE CASCADE,
+    timestamp  TIMESTAMPTZ NOT NULL DEFAULT now(),
+    level      TEXT NOT NULL DEFAULT 'info',
+    message    TEXT NOT NULL,
+    metadata   JSONB DEFAULT '{}'
+);
+
+CREATE INDEX idx_job_log_job ON job_log(job_id, timestamp);
+
+COMMIT;

migrations/016_module_system.sql

@@ -0,0 +1,15 @@
+-- 016_module_system.sql — settings overrides and module state persistence
+
+CREATE TABLE IF NOT EXISTS settings_overrides (
+    key         TEXT PRIMARY KEY,
+    value       JSONB NOT NULL,
+    updated_by  TEXT NOT NULL,
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS module_state (
+    module_id   TEXT PRIMARY KEY,
+    enabled     BOOLEAN NOT NULL,
+    updated_by  TEXT NOT NULL,
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);

migrations/017_file_storage_metadata.sql

@@ -0,0 +1,7 @@
+-- Track which storage backend holds each attached file.
+ALTER TABLE item_files
+  ADD COLUMN IF NOT EXISTS storage_backend TEXT NOT NULL DEFAULT 'minio';
+
+-- Track which storage backend holds each revision file.
+ALTER TABLE revisions
+  ADD COLUMN IF NOT EXISTS file_storage_backend TEXT NOT NULL DEFAULT 'minio';

migrations/018_kc_metadata.sql

@@ -0,0 +1,110 @@
+-- Migration 018: .kc Server-Side Metadata Tables
+--
+-- Adds tables for indexing the silo/ directory contents from .kc files.
+-- See docs/KC_SERVER.md for the full specification.
+--
+-- Tables:
+--   item_metadata        - indexed manifest + metadata fields (Section 3.1)
+--   item_dependencies    - CAD-extracted assembly dependencies (Section 3.2)
+--   item_approvals       - ECO workflow state (Section 3.3)
+--   approval_signatures  - individual approval/rejection records (Section 3.3)
+--   item_macros          - registered macros from silo/macros/ (Section 3.4)
+
+BEGIN;
+
+--------------------------------------------------------------------------------
+-- item_metadata: indexed silo/manifest.json + silo/metadata.json
+--------------------------------------------------------------------------------
+
+CREATE TABLE item_metadata (
+    item_id         UUID PRIMARY KEY REFERENCES items(id) ON DELETE CASCADE,
+    schema_name     TEXT,
+    tags            TEXT[] NOT NULL DEFAULT '{}',
+    lifecycle_state TEXT NOT NULL DEFAULT 'draft',
+    fields          JSONB NOT NULL DEFAULT '{}',
+    kc_version      TEXT,
+    manifest_uuid   UUID,
+    silo_instance   TEXT,
+    revision_hash   TEXT,
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_by      TEXT
+);
+
+CREATE INDEX idx_item_metadata_tags ON item_metadata USING GIN (tags);
+CREATE INDEX idx_item_metadata_lifecycle ON item_metadata (lifecycle_state);
+CREATE INDEX idx_item_metadata_fields ON item_metadata USING GIN (fields);
+
+--------------------------------------------------------------------------------
+-- item_dependencies: indexed silo/dependencies.json
+--
+-- Complements the existing `relationships` table.
+--   relationships    = server-authoritative BOM (web UI / API editable)
+--   item_dependencies = CAD-authoritative record (extracted from .kc)
+-- BOM merge reconciles the two (see docs/BOM_MERGE.md).
+--------------------------------------------------------------------------------
+
+CREATE TABLE item_dependencies (
+    id                UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    parent_item_id    UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    child_uuid        UUID NOT NULL,
+    child_part_number TEXT,
+    child_revision    INTEGER,
+    quantity          DECIMAL,
+    label             TEXT,
+    relationship      TEXT NOT NULL DEFAULT 'component',
+    revision_number   INTEGER NOT NULL,
+    created_at        TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_item_deps_parent ON item_dependencies (parent_item_id);
+CREATE INDEX idx_item_deps_child ON item_dependencies (child_uuid);
+
+--------------------------------------------------------------------------------
+-- item_approvals + approval_signatures: ECO workflow
+--
+-- Server-authoritative. The .kc silo/approvals.json is a read cache
+-- packed on checkout for offline display in Create.
+--------------------------------------------------------------------------------
+
+CREATE TABLE item_approvals (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id     UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    eco_number  TEXT,
+    state       TEXT NOT NULL DEFAULT 'draft',
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_by  TEXT
+);
+
+CREATE INDEX idx_item_approvals_item ON item_approvals (item_id);
+CREATE INDEX idx_item_approvals_state ON item_approvals (state);
+
+CREATE TABLE approval_signatures (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    approval_id UUID NOT NULL REFERENCES item_approvals(id) ON DELETE CASCADE,
+    username    TEXT NOT NULL,
+    role        TEXT NOT NULL,
+    status      TEXT NOT NULL DEFAULT 'pending',
+    signed_at   TIMESTAMPTZ,
+    comment     TEXT
+);
+
+CREATE INDEX idx_approval_sigs_approval ON approval_signatures (approval_id);
+
+--------------------------------------------------------------------------------
+-- item_macros: registered macros from silo/macros/
+--------------------------------------------------------------------------------
+
+CREATE TABLE item_macros (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    item_id         UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    filename        TEXT NOT NULL,
+    trigger         TEXT NOT NULL DEFAULT 'manual',
+    content         TEXT NOT NULL,
+    revision_number INTEGER NOT NULL,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE(item_id, filename)
+);
+
+CREATE INDEX idx_item_macros_item ON item_macros (item_id);
+
+COMMIT;