update databasing system with minimum API, schema parsing and FreeCAD

integration

migrations/004_cad_sync_state.sql

@@ -0,0 +1,18 @@
+-- Silo Database Schema
+-- Migration: 004_cad_sync_state
+-- Date: 2026-01
+-- Description: Add CAD file sync tracking for FreeCAD integration
+
+BEGIN;
+
+-- Add columns to track CAD file sync state
+ALTER TABLE items ADD COLUMN cad_synced_at TIMESTAMPTZ;
+ALTER TABLE items ADD COLUMN cad_file_path TEXT;
+
+-- Index for finding unsynced items
+CREATE INDEX idx_items_cad_synced ON items(cad_synced_at) WHERE cad_synced_at IS NULL;
+
+COMMENT ON COLUMN items.cad_synced_at IS 'Timestamp when the item was last synced with a local FreeCAD file';
+COMMENT ON COLUMN items.cad_file_path IS 'Expected local path for the CAD file (relative to projects dir)';
+
+COMMIT;