feat: add sourcing type, extended fields, and inline project tagging

- Add migration 009: sourcing_type (manufactured/purchased), sourcing_link,
  long_description, and standard_cost columns on items table
- Update Item struct, repository queries, and API handlers for new fields
- Add sourcing badge, long description block, standard cost, and sourcing
  link display to item detail panel
- Add inline project tag editor in detail panel (add/remove via dropdown)
- Add new fields to create and edit modals
- Update CSV import/export for new columns
- Merge with auth CreatedBy/UpdatedBy changes from stash

internal/api/csv.go

@@ -50,6 +50,10 @@ var csvColumns = []string{
 	"updated_at",
 	"category",
 	"projects", // comma-separated project codes
+	"sourcing_type",
+	"sourcing_link",
+	"long_description",
+	"standard_cost",
 }
 
 // HandleExportCSV exports items to CSV format.
@@ -153,6 +157,16 @@ func (s *Server) HandleExportCSV(w http.ResponseWriter, r *http.Request) {
 		row[5] = item.UpdatedAt.Format(time.RFC3339)
 		row[6] = category
 		row[7] = projectCodes
+		row[8] = item.SourcingType
+		if item.SourcingLink != nil {
+			row[9] = *item.SourcingLink
+		}
+		if item.LongDescription != nil {
+			row[10] = *item.LongDescription
+		}
+		if item.StandardCost != nil {
+			row[11] = strconv.FormatFloat(*item.StandardCost, 'f', -1, 64)
+		}
 
 		// Property columns
 		if includeProps {
@@ -350,6 +364,12 @@ func (s *Server) HandleImportCSV(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 
+		// Parse extended fields
+		sourcingType := getCSVValue(record, colIndex, "sourcing_type")
+		sourcingLink := getCSVValue(record, colIndex, "sourcing_link")
+		longDesc := getCSVValue(record, colIndex, "long_description")
+		stdCostStr := getCSVValue(record, colIndex, "standard_cost")
+
 		// Create item
 		item := &db.Item{
 			PartNumber:  partNumber,
@@ -359,6 +379,20 @@ func (s *Server) HandleImportCSV(w http.ResponseWriter, r *http.Request) {
 		if user := auth.UserFromContext(ctx); user != nil {
 			item.CreatedBy = &user.Username
 		}
+		if sourcingType != "" {
+			item.SourcingType = sourcingType
+		}
+		if sourcingLink != "" {
+			item.SourcingLink = &sourcingLink
+		}
+		if longDesc != "" {
+			item.LongDescription = &longDesc
+		}
+		if stdCostStr != "" {
+			if cost, err := strconv.ParseFloat(stdCostStr, 64); err == nil {
+				item.StandardCost = &cost
+			}
+		}
 
 		if err := s.items.Create(ctx, item, properties); err != nil {
 			result.Errors = append(result.Errors, CSVImportErr{
@@ -543,6 +577,10 @@ func isStandardColumn(col string) bool {
 		"projects":         true,
 		"objects":          true, // FreeCAD objects data - skip on import
 		"archived_at":      true,
+		"sourcing_type":    true,
+		"sourcing_link":    true,
+		"long_description": true,
+		"standard_cost":    true,
 	}
 	return standardCols[col]
 }

internal/api/handlers.go

@@ -232,6 +232,10 @@ type ItemResponse struct {
 	CurrentRevision int            `json:"current_revision"`
 	CreatedAt       string         `json:"created_at"`
 	UpdatedAt       string         `json:"updated_at"`
+	SourcingType    string         `json:"sourcing_type"`
+	SourcingLink    *string        `json:"sourcing_link,omitempty"`
+	LongDescription *string        `json:"long_description,omitempty"`
+	StandardCost    *float64       `json:"standard_cost,omitempty"`
 	Properties      map[string]any `json:"properties,omitempty"`
 }
 
@@ -242,6 +246,10 @@ type CreateItemRequest struct {
 	Description     string         `json:"description"`
 	Projects        []string       `json:"projects,omitempty"`
 	Properties      map[string]any `json:"properties,omitempty"`
+	SourcingType    string         `json:"sourcing_type,omitempty"`
+	SourcingLink    *string        `json:"sourcing_link,omitempty"`
+	LongDescription *string        `json:"long_description,omitempty"`
+	StandardCost    *float64       `json:"standard_cost,omitempty"`
 }
 
 // HandleListItems lists items with optional filtering.
@@ -373,6 +381,10 @@ func (s *Server) HandleCreateItem(w http.ResponseWriter, r *http.Request) {
 		PartNumber:      partNumber,
 		ItemType:        itemType,
 		Description:     req.Description,
+		SourcingType:    req.SourcingType,
+		SourcingLink:    req.SourcingLink,
+		LongDescription: req.LongDescription,
+		StandardCost:    req.StandardCost,
 	}
 	if user := auth.UserFromContext(ctx); user != nil {
 		item.CreatedBy = &user.Username
@@ -444,6 +456,10 @@ type UpdateItemRequest struct {
 	Description     string         `json:"description,omitempty"`
 	Properties      map[string]any `json:"properties,omitempty"`
 	Comment         string         `json:"comment,omitempty"`
+	SourcingType    *string        `json:"sourcing_type,omitempty"`
+	SourcingLink    *string        `json:"sourcing_link,omitempty"`
+	LongDescription *string        `json:"long_description,omitempty"`
+	StandardCost    *float64       `json:"standard_cost,omitempty"`
 }
 
 // HandleUpdateItem updates an item's fields and/or creates a new revision.
@@ -469,26 +485,31 @@ func (s *Server) HandleUpdateItem(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Update item fields if provided
-	newPartNumber := item.PartNumber
-	newItemType := item.ItemType
-	newDescription := item.Description
+	fields := db.UpdateItemFields{
+		PartNumber:      item.PartNumber,
+		ItemType:        item.ItemType,
+		Description:     item.Description,
+		SourcingType:    req.SourcingType,
+		SourcingLink:    req.SourcingLink,
+		LongDescription: req.LongDescription,
+		StandardCost:    req.StandardCost,
+	}
 
 	if req.PartNumber != "" {
-		newPartNumber = req.PartNumber
+		fields.PartNumber = req.PartNumber
 	}
 	if req.ItemType != "" {
-		newItemType = req.ItemType
+		fields.ItemType = req.ItemType
 	}
 	if req.Description != "" {
-		newDescription = req.Description
+		fields.Description = req.Description
 	}
 
 	// Update the item record (UUID stays the same)
-	var updatedBy *string
 	if user := auth.UserFromContext(ctx); user != nil {
-		updatedBy = &user.Username
+		fields.UpdatedBy = &user.Username
 	}
-	if err := s.items.Update(ctx, item.ID, newPartNumber, newItemType, newDescription, updatedBy); err != nil {
+	if err := s.items.Update(ctx, item.ID, fields); err != nil {
 		s.logger.Error().Err(err).Msg("failed to update item")
 		writeError(w, http.StatusInternalServerError, "update_failed", err.Error())
 		return
@@ -513,7 +534,7 @@ func (s *Server) HandleUpdateItem(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Get updated item (use new part number if changed)
-	item, _ = s.items.GetByPartNumber(ctx, newPartNumber)
+	item, _ = s.items.GetByPartNumber(ctx, fields.PartNumber)
 	writeJSON(w, http.StatusOK, itemToResponse(item))
 }
 
@@ -1074,6 +1095,10 @@ func itemToResponse(item *db.Item) ItemResponse {
 		CurrentRevision: item.CurrentRevision,
 		CreatedAt:       item.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
 		UpdatedAt:       item.UpdatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		SourcingType:    item.SourcingType,
+		SourcingLink:    item.SourcingLink,
+		LongDescription: item.LongDescription,
+		StandardCost:    item.StandardCost,
 	}
 }
 

internal/api/templates/items.html

@@ -447,6 +447,42 @@
                     placeholder="Item description"
                 />
             </div>
+            <div class="form-group">
+                <label class="form-label">Sourcing Type</label>
+                <select class="form-input" id="sourcing-type">
+                    <option value="manufactured">Manufactured</option>
+                    <option value="purchased">Purchased</option>
+                </select>
+            </div>
+            <div class="form-group">
+                <label class="form-label">Long Description (optional)</label>
+                <textarea
+                    class="form-input"
+                    id="long-description"
+                    rows="3"
+                    placeholder="Extended description, specifications, notes..."
+                    style="resize: vertical"
+                ></textarea>
+            </div>
+            <div class="form-group">
+                <label class="form-label">Standard Cost (optional)</label>
+                <input
+                    type="number"
+                    class="form-input"
+                    id="standard-cost"
+                    step="0.01"
+                    placeholder="0.00"
+                />
+            </div>
+            <div class="form-group">
+                <label class="form-label">Sourcing Link (optional)</label>
+                <input
+                    type="url"
+                    class="form-input"
+                    id="sourcing-link"
+                    placeholder="https://..."
+                />
+            </div>
             <div class="form-group">
                 <label class="form-label">Project Tags (optional)</label>
                 <div class="project-tags-container" id="project-tags-container">
@@ -514,6 +550,42 @@
                     placeholder="Item description"
                 />
             </div>
+            <div class="form-group">
+                <label class="form-label">Sourcing Type</label>
+                <select class="form-input" id="edit-sourcing-type">
+                    <option value="manufactured">Manufactured</option>
+                    <option value="purchased">Purchased</option>
+                </select>
+            </div>
+            <div class="form-group">
+                <label class="form-label">Long Description</label>
+                <textarea
+                    class="form-input"
+                    id="edit-long-description"
+                    rows="3"
+                    placeholder="Extended description, specifications, notes..."
+                    style="resize: vertical"
+                ></textarea>
+            </div>
+            <div class="form-group">
+                <label class="form-label">Standard Cost</label>
+                <input
+                    type="number"
+                    class="form-input"
+                    id="edit-standard-cost"
+                    step="0.01"
+                    placeholder="0.00"
+                />
+            </div>
+            <div class="form-group">
+                <label class="form-label">Sourcing Link</label>
+                <input
+                    type="url"
+                    class="form-input"
+                    id="edit-sourcing-link"
+                    placeholder="https://..."
+                />
+            </div>
             <div class="form-actions">
                 <button
                     type="button"
@@ -1680,6 +1752,80 @@
         color: var(--ctp-text);
         cursor: pointer;
     }
+    /* Sourcing Type Badges */
+    .sourcing-badge {
+        display: inline-block;
+        padding: 0.2rem 0.5rem;
+        border-radius: 0.375rem;
+        font-size: 0.75rem;
+        font-weight: 600;
+        text-transform: uppercase;
+    }
+    .sourcing-manufactured {
+        background: var(--ctp-blue);
+        color: var(--ctp-crust);
+    }
+    .sourcing-purchased {
+        background: var(--ctp-peach);
+        color: var(--ctp-crust);
+    }
+    /* Long Description Block */
+    .long-desc-block {
+        background: var(--ctp-surface1);
+        border-radius: 0.375rem;
+        padding: 0.75rem;
+        margin: 0.25rem 0 0.75rem 0;
+        font-size: 0.9rem;
+        color: var(--ctp-subtext1);
+        white-space: pre-wrap;
+        line-height: 1.5;
+    }
+    /* Inline Project Tag Editor */
+    .project-tags-editor {
+        display: inline-flex;
+        flex-wrap: wrap;
+        align-items: center;
+        gap: 0.35rem;
+        vertical-align: middle;
+    }
+    .project-tags-editor .item-project-tag {
+        display: inline-flex;
+        align-items: center;
+        gap: 0.25rem;
+    }
+    .project-tags-editor .tag-remove-inline {
+        background: transparent;
+        border: none;
+        color: var(--ctp-overlay0);
+        cursor: pointer;
+        padding: 0;
+        font-size: 0.85rem;
+        line-height: 1;
+        border-radius: 50%;
+        width: 1rem;
+        height: 1rem;
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        transition: all 0.15s;
+    }
+    .project-tags-editor .tag-remove-inline:hover {
+        background: var(--ctp-red);
+        color: var(--ctp-crust);
+    }
+    .project-add-inline {
+        display: inline-flex;
+        align-items: center;
+    }
+    .project-add-inline select {
+        padding: 0.15rem 0.4rem;
+        font-size: 0.75rem;
+        background: var(--ctp-surface1);
+        border: 1px solid var(--ctp-surface2);
+        border-radius: 0.375rem;
+        color: var(--ctp-subtext0);
+        cursor: pointer;
+    }
 </style>
 <script>
     let currentPage = 1;
@@ -2180,8 +2326,24 @@
             schema: "kindred-rd",
             category: document.getElementById("category").value,
             description: document.getElementById("description").value,
+            sourcing_type: document.getElementById("sourcing-type").value,
         };
 
+        const longDesc = document
+            .getElementById("long-description")
+            .value.trim();
+        if (longDesc) data.long_description = longDesc;
+
+        const stdCost = parseFloat(
+            document.getElementById("standard-cost").value,
+        );
+        if (!isNaN(stdCost)) data.standard_cost = stdCost;
+
+        const sourcingLink = document
+            .getElementById("sourcing-link")
+            .value.trim();
+        if (sourcingLink) data.sourcing_link = sourcingLink;
+
         // Add project tags if any selected
         if (selectedProjectTags.length > 0) {
             data.projects = selectedProjectTags;
@@ -2227,6 +2389,14 @@
             document.getElementById("edit-type").value = item.item_type;
             document.getElementById("edit-description").value =
                 item.description || "";
+            document.getElementById("edit-sourcing-type").value =
+                item.sourcing_type || "manufactured";
+            document.getElementById("edit-long-description").value =
+                item.long_description || "";
+            document.getElementById("edit-standard-cost").value =
+                item.standard_cost != null ? item.standard_cost : "";
+            document.getElementById("edit-sourcing-link").value =
+                item.sourcing_link || "";
         } catch (error) {
             alert(`Error loading item: ${error.message}`);
             closeEditModal();
@@ -2242,10 +2412,19 @@
         event.preventDefault();
 
         const originalPN = document.getElementById("edit-original-pn").value;
+        const stdCostVal = parseFloat(
+            document.getElementById("edit-standard-cost").value,
+        );
         const data = {
             part_number: document.getElementById("edit-part-number").value,
             item_type: document.getElementById("edit-type").value,
             description: document.getElementById("edit-description").value,
+            sourcing_type: document.getElementById("edit-sourcing-type").value,
+            long_description:
+                document.getElementById("edit-long-description").value || null,
+            standard_cost: !isNaN(stdCostVal) ? stdCostVal : null,
+            sourcing_link:
+                document.getElementById("edit-sourcing-link").value || null,
         };
 
         try {
@@ -2454,35 +2633,44 @@
             }
 
             // Fetch project tags for this item
-            let projectTagsHtml =
-                '<span class="item-projects"><em style="color: var(--ctp-subtext0);">None</em></span>';
+            let itemProjectsList = [];
             try {
                 const projectsRes = await fetch(
                     `/api/items/${partNumber}/projects`,
                 );
                 if (projectsRes.ok) {
-                    const itemProjects = await projectsRes.json();
-                    if (itemProjects && itemProjects.length > 0) {
-                        projectTagsHtml = `<span class="item-projects">${itemProjects
-                            .map(
-                                (p) =>
-                                    `<span class="item-project-tag">${p.code || p}</span>`,
-                            )
-                            .join("")}</span>`;
-                    }
+                    itemProjectsList = await projectsRes.json();
                 }
             } catch (e) {
                 console.warn("Failed to load project tags:", e);
             }
 
+            const projectTagsHtml = buildProjectTagsEditor(
+                partNumber,
+                itemProjectsList,
+            );
+
+            // Build sourcing info
+            const sourcingType = item.sourcing_type || "manufactured";
+            const sourcingLink = item.sourcing_link || "";
+            const longDesc = item.long_description || "";
+            const stdCost =
+                item.standard_cost != null
+                    ? `$${Number(item.standard_cost).toFixed(2)}`
+                    : "-";
+
             // Info tab
             document.getElementById("tab-main").innerHTML = `
                 <div style="margin-bottom: 1.5rem;">
                     <p><strong>ID:</strong> <code style="background: var(--ctp-surface1); padding: 0.25rem 0.5rem; border-radius: 0.25rem; font-size: 0.85rem;">${item.id}</code></p>
                     <p><strong>Part Number:</strong> <span class="part-number-container"><span class="part-number">${item.part_number}</span><button class="copy-btn" onclick="copyPartNumber('${item.part_number}', this)" title="Copy part number">${icons.clipboard}</button></span></p>
                     <p><strong>Type:</strong> <span class="item-type item-type-${item.item_type}">${item.item_type}</span></p>
+                    <p><strong>Sourcing:</strong> <span class="sourcing-badge sourcing-${sourcingType}">${sourcingType}</span></p>
                     <p><strong>Description:</strong> ${item.description || "-"}</p>
-                    <p><strong>Projects:</strong> ${projectTagsHtml}</p>
+                    ${longDesc ? `<p><strong>Long Description:</strong></p><div class="long-desc-block">${escapeHtml(longDesc)}</div>` : ""}
+                    <p><strong>Standard Cost:</strong> <span style="font-family: 'JetBrains Mono', monospace;">${stdCost}</span></p>
+                    ${sourcingLink ? `<p><strong>Sourcing Link:</strong> <a href="${escapeAttr(sourcingLink)}" target="_blank" rel="noopener" style="color: var(--ctp-blue);">${escapeHtml(sourcingLink.length > 60 ? sourcingLink.substring(0, 60) + "..." : sourcingLink)}</a></p>` : ""}
+                    <div style="margin: 0.75rem 0;"><strong>Projects:</strong> ${projectTagsHtml}</div>
                     <p><strong>Current Revision:</strong> ${item.current_revision}</p>
                     <p><strong>Created:</strong> ${formatDate(item.created_at)}</p>
                     <p><strong>Updated:</strong> ${formatDate(item.updated_at)}</p>
@@ -3709,6 +3897,76 @@
         }
     }
 
+    // ========================================
+    // Inline Project Tag Editor (Detail Panel)
+    // ========================================
+
+    function buildProjectTagsEditor(partNumber, itemProjects) {
+        const escapedPN = escapeAttr(partNumber);
+        const tags = (itemProjects || [])
+            .map((p) => {
+                const code = p.code || p;
+                return `<span class="item-project-tag">${escapeHtml(code)}<button class="tag-remove-inline" onclick="removeDetailProjectTag('${escapedPN}', '${escapeAttr(code)}')" title="Remove">&times;</button></span>`;
+            })
+            .join("");
+
+        // Build dropdown of available projects (exclude already tagged)
+        const taggedCodes = (itemProjects || []).map((p) => p.code || p);
+        const available = projectCodes.filter((c) => !taggedCodes.includes(c));
+        let addDropdown = "";
+        if (available.length > 0) {
+            const opts = available
+                .map(
+                    (c) =>
+                        `<option value="${escapeAttr(c)}">${escapeHtml(c)}</option>`,
+                )
+                .join("");
+            addDropdown = `<span class="project-add-inline"><select onchange="addDetailProjectTag('${escapedPN}', this.value); this.value='';">
+                <option value="">+ tag</option>${opts}
+            </select></span>`;
+        }
+
+        return `<span class="project-tags-editor">${tags || '<em style="color: var(--ctp-subtext0); font-size: 0.85rem;">None</em>'}${addDropdown}</span>`;
+    }
+
+    async function addDetailProjectTag(partNumber, projectCode) {
+        if (!projectCode) return;
+        try {
+            const response = await fetch(`/api/items/${partNumber}/projects`, {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ projects: [projectCode] }),
+            });
+            if (!response.ok) {
+                const err = await response.json();
+                alert(err.message || err.error);
+                return;
+            }
+            showItemDetail(partNumber);
+        } catch (error) {
+            alert(error.message);
+        }
+    }
+
+    async function removeDetailProjectTag(partNumber, projectCode) {
+        try {
+            const response = await fetch(
+                `/api/items/${partNumber}/projects/${projectCode}`,
+                {
+                    method: "DELETE",
+                },
+            );
+            if (!response.ok && response.status !== 204) {
+                const err = await response.json();
+                alert(err.message || err.error);
+                return;
+            }
+            showItemDetail(partNumber);
+        } catch (error) {
+            alert(error.message);
+        }
+    }
+
     // Initialize
     initLayout();
     loadSchema();

internal/db/items.go

@@ -24,6 +24,10 @@ type Item struct {
 	CADFilePath     *string
 	CreatedBy       *string
 	UpdatedBy       *string
+	SourcingType    string   // "manufactured" or "purchased"
+	SourcingLink    *string  // URL to supplier/datasheet
+	LongDescription *string  // extended description
+	StandardCost    *float64 // baseline unit cost
 }
 
 // Revision represents a revision record.
@@ -85,11 +89,18 @@ func NewItemRepository(db *DB) *ItemRepository {
 func (r *ItemRepository) Create(ctx context.Context, item *Item, properties map[string]any) error {
 	return r.db.Tx(ctx, func(tx pgx.Tx) error {
 		// Insert item
+		sourcingType := item.SourcingType
+		if sourcingType == "" {
+			sourcingType = "manufactured"
+		}
 		err := tx.QueryRow(ctx, `
-			INSERT INTO items (part_number, schema_id, item_type, description, created_by)
-			VALUES ($1, $2, $3, $4, $5)
+			INSERT INTO items (part_number, schema_id, item_type, description, created_by,
+			                   sourcing_type, sourcing_link, long_description, standard_cost)
+			VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
 			RETURNING id, created_at, updated_at, current_revision
-		`, item.PartNumber, item.SchemaID, item.ItemType, item.Description, item.CreatedBy).Scan(
+		`, item.PartNumber, item.SchemaID, item.ItemType, item.Description, item.CreatedBy,
+			sourcingType, item.SourcingLink, item.LongDescription, item.StandardCost,
+		).Scan(
 			&item.ID, &item.CreatedAt, &item.UpdatedAt, &item.CurrentRevision,
 		)
 		if err != nil {
@@ -120,13 +131,15 @@ func (r *ItemRepository) GetByPartNumber(ctx context.Context, partNumber string)
 	err := r.db.pool.QueryRow(ctx, `
 		SELECT id, part_number, schema_id, item_type, description,
 		       created_at, updated_at, archived_at, current_revision,
-		       cad_synced_at, cad_file_path
+		       cad_synced_at, cad_file_path,
+		       sourcing_type, sourcing_link, long_description, standard_cost
 		FROM items
 		WHERE part_number = $1 AND archived_at IS NULL
 	`, partNumber).Scan(
 		&item.ID, &item.PartNumber, &item.SchemaID, &item.ItemType, &item.Description,
 		&item.CreatedAt, &item.UpdatedAt, &item.ArchivedAt, &item.CurrentRevision,
 		&item.CADSyncedAt, &item.CADFilePath,
+		&item.SourcingType, &item.SourcingLink, &item.LongDescription, &item.StandardCost,
 	)
 	if err == pgx.ErrNoRows {
 		return nil, nil
@@ -143,13 +156,15 @@ func (r *ItemRepository) GetByID(ctx context.Context, id string) (*Item, error)
 	err := r.db.pool.QueryRow(ctx, `
 		SELECT id, part_number, schema_id, item_type, description,
 		       created_at, updated_at, archived_at, current_revision,
-		       cad_synced_at, cad_file_path
+		       cad_synced_at, cad_file_path,
+		       sourcing_type, sourcing_link, long_description, standard_cost
 		FROM items
 		WHERE id = $1
 	`, id).Scan(
 		&item.ID, &item.PartNumber, &item.SchemaID, &item.ItemType, &item.Description,
 		&item.CreatedAt, &item.UpdatedAt, &item.ArchivedAt, &item.CurrentRevision,
 		&item.CADSyncedAt, &item.CADFilePath,
+		&item.SourcingType, &item.SourcingLink, &item.LongDescription, &item.StandardCost,
 	)
 	if err == pgx.ErrNoRows {
 		return nil, nil
@@ -171,7 +186,8 @@ func (r *ItemRepository) List(ctx context.Context, opts ListOptions) ([]*Item, e
 		// Filter by project via many-to-many relationship
 		query = `
 			SELECT DISTINCT i.id, i.part_number, i.schema_id, i.item_type, i.description,
-			       i.created_at, i.updated_at, i.archived_at, i.current_revision
+			       i.created_at, i.updated_at, i.archived_at, i.current_revision,
+			       i.sourcing_type, i.sourcing_link, i.long_description, i.standard_cost
 			FROM items i
 			JOIN item_projects ip ON ip.item_id = i.id
 			JOIN projects p ON p.id = ip.project_id
@@ -182,7 +198,8 @@ func (r *ItemRepository) List(ctx context.Context, opts ListOptions) ([]*Item, e
 	} else {
 		query = `
 			SELECT id, part_number, schema_id, item_type, description,
-			       created_at, updated_at, archived_at, current_revision
+			       created_at, updated_at, archived_at, current_revision,
+			       sourcing_type, sourcing_link, long_description, standard_cost
 			FROM items
 			WHERE archived_at IS NULL
 		`
@@ -233,6 +250,7 @@ func (r *ItemRepository) List(ctx context.Context, opts ListOptions) ([]*Item, e
 		err := rows.Scan(
 			&item.ID, &item.PartNumber, &item.SchemaID, &item.ItemType, &item.Description,
 			&item.CreatedAt, &item.UpdatedAt, &item.ArchivedAt, &item.CurrentRevision,
+			&item.SourcingType, &item.SourcingLink, &item.LongDescription, &item.StandardCost,
 		)
 		if err != nil {
 			return nil, fmt.Errorf("scanning item: %w", err)
@@ -626,14 +644,35 @@ func (r *ItemRepository) Archive(ctx context.Context, id string) error {
 	return err
 }
 
-// Update modifies an item's part number, type, and description.
-// The UUID remains stable.
-func (r *ItemRepository) Update(ctx context.Context, id string, partNumber string, itemType string, description string, updatedBy *string) error {
+// UpdateItemFields holds the fields that can be updated on an item.
+type UpdateItemFields struct {
+	PartNumber      string
+	ItemType        string
+	Description     string
+	UpdatedBy       *string
+	SourcingType    *string
+	SourcingLink    *string
+	LongDescription *string
+	StandardCost    *float64
+}
+
+// Update modifies an item's fields. The UUID remains stable.
+func (r *ItemRepository) Update(ctx context.Context, id string, fields UpdateItemFields) error {
 	_, err := r.db.pool.Exec(ctx, `
 		UPDATE items
-		SET part_number = $2, item_type = $3, description = $4, updated_by = $5, updated_at = now()
+		SET part_number = $2, item_type = $3, description = $4, updated_by = $5,
+		    sourcing_type = COALESCE($6, sourcing_type),
+		    sourcing_link = CASE WHEN $7::boolean THEN $8 ELSE sourcing_link END,
+		    long_description = CASE WHEN $9::boolean THEN $10 ELSE long_description END,
+		    standard_cost = CASE WHEN $11::boolean THEN $12 ELSE standard_cost END,
+		    updated_at = now()
 		WHERE id = $1 AND archived_at IS NULL
-	`, id, partNumber, itemType, description, updatedBy)
+	`, id, fields.PartNumber, fields.ItemType, fields.Description, fields.UpdatedBy,
+		fields.SourcingType,
+		fields.SourcingLink != nil, fields.SourcingLink,
+		fields.LongDescription != nil, fields.LongDescription,
+		fields.StandardCost != nil, fields.StandardCost,
+	)
 	if err != nil {
 		return fmt.Errorf("updating item: %w", err)
 	}

internal/db/projects.go

@@ -239,7 +239,8 @@ func (r *ProjectRepository) GetItemsForProject(ctx context.Context, projectID st
 	rows, err := r.db.pool.Query(ctx, `
 		SELECT i.id, i.part_number, i.schema_id, i.item_type, i.description,
 		       i.created_at, i.updated_at, i.archived_at, i.current_revision,
-		       i.cad_synced_at, i.cad_file_path
+		       i.cad_synced_at, i.cad_file_path,
+		       i.sourcing_type, i.sourcing_link, i.long_description, i.standard_cost
 		FROM items i
 		JOIN item_projects ip ON ip.item_id = i.id
 		WHERE ip.project_id = $1 AND i.archived_at IS NULL
@@ -257,6 +258,7 @@ func (r *ProjectRepository) GetItemsForProject(ctx context.Context, projectID st
 			&item.ID, &item.PartNumber, &item.SchemaID, &item.ItemType, &item.Description,
 			&item.CreatedAt, &item.UpdatedAt, &item.ArchivedAt, &item.CurrentRevision,
 			&item.CADSyncedAt, &item.CADFilePath,
+			&item.SourcingType, &item.SourcingLink, &item.LongDescription, &item.StandardCost,
 		); err != nil {
 			return nil, err
 		}

migrations/009_item_extended_fields.sql

@@ -0,0 +1,21 @@
+-- Migration 009: Extended Item Fields
+--
+-- Adds sourcing classification, sourcing link, long description, and standard cost
+-- directly to the items table for first-class item metadata.
+
+-- Sourcing type: manufactured in-house vs. purchased/COTS
+-- Using a check constraint rather than an enum for flexibility.
+ALTER TABLE items ADD COLUMN sourcing_type VARCHAR(20) NOT NULL DEFAULT 'manufactured'
+    CHECK (sourcing_type IN ('manufactured', 'purchased'));
+
+-- Sourcing link: URL to supplier page, datasheet, or procurement source
+ALTER TABLE items ADD COLUMN sourcing_link TEXT;
+
+-- Long description: extended description for detailed specifications, notes, etc.
+ALTER TABLE items ADD COLUMN long_description TEXT;
+
+-- Standard cost: baseline unit cost for budgeting/estimation (precision: up to $9,999,999.99)
+ALTER TABLE items ADD COLUMN standard_cost DECIMAL(12, 4);
+
+-- Index on sourcing_type for filtering
+CREATE INDEX idx_items_sourcing_type ON items(sourcing_type);