Merge branch 'worktree-agent-a64432fc' into Develop

# Conflicts:
#	.planning/STATE.md

.planning/phases/19-reference-item-model-tags-schema/19-01-SUMMARY.md

@@ -0,0 +1,117 @@
+---
+phase: 19-reference-item-model-tags-schema
+plan: 01
+subsystem: database
+tags: [drizzle, postgres, schema, migration, tags, reference-items]
+
+requires:
+  - phase: 18-global-items-public-profiles
+    provides: globalItems table and itemGlobalLinks junction table
+provides:
+  - items.globalItemId direct FK replacing itemGlobalLinks junction table
+  - items.purchasePriceCents for user-specific purchase price tracking
+  - threadCandidates.globalItemId for catalog-linked candidates
+  - tags and globalItemTags tables for tag-based discovery
+  - Zod schemas with globalItemId and purchasePriceCents fields
+  - Tag and GlobalItemTag TypeScript types
+  - 30 curated seed tags for outdoor/adventure gear
+affects: [19-02, 19-03, global-item-service, item-service, thread-service]
+
+tech-stack:
+  added: []
+  patterns:
+    - "Reference item model: nullable globalItemId FK on items replaces junction table"
+    - "Tag system: flat tags table with many-to-many via globalItemTags"
+
+key-files:
+  created:
+    - drizzle-pg/0002_wakeful_vermin.sql
+  modified:
+    - src/db/schema.ts
+    - src/shared/schemas.ts
+    - src/shared/types.ts
+    - src/db/seed-global-items.ts
+
+key-decisions:
+  - "Data migration in SQL: UPDATE items SET global_item_id before DROP TABLE item_global_links"
+  - "Seed tags as flat list without type categorization per D-16"
+
+patterns-established:
+  - "Reference items: globalItemId nullable FK on items table, when set base data comes from global item"
+  - "Tag seeding: idempotent async seedTags function alongside seedGlobalItems"
+
+requirements-completed: [CATFLOW-03, TAG-01, TAG-02]
+
+duration: 4min
+completed: 2026-04-05
+---
+
+# Phase 19 Plan 01: Reference Item Model & Tags Schema Summary
+
+**Database schema updated with direct globalItemId FK on items/candidates, tags system tables, and data migration from itemGlobalLinks**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-04-05T18:23:49Z
+- **Completed:** 2026-04-05T18:28:00Z
+- **Tasks:** 2
+- **Files modified:** 5
+
+## Accomplishments
+- Added globalItemId and purchasePriceCents columns to items table, globalItemId to threadCandidates
+- Created tags and globalItemTags tables for tag-based global item discovery
+- Removed itemGlobalLinks junction table with safe data migration in SQL
+- Updated Zod schemas with new fields, removed linkItemSchema
+- Converted seed script to async with 30 curated outdoor/adventure tags
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Update schema.ts, generate migration with data migration step** - `5df513c` (feat)
+2. **Task 2: Update Zod schemas, types, test helpers, and seed script** - `e9baa8d` (feat)
+
+## Files Created/Modified
+- `src/db/schema.ts` - Added globalItemId/purchasePriceCents to items, globalItemId to threadCandidates, tags + globalItemTags tables, removed itemGlobalLinks
+- `src/shared/schemas.ts` - Added globalItemId/purchasePriceCents to createItemSchema, globalItemId to createCandidateSchema, tags to searchGlobalItemsSchema, removed linkItemSchema
+- `src/shared/types.ts` - Added Tag and GlobalItemTag types, removed ItemGlobalLink and LinkItem
+- `src/db/seed-global-items.ts` - Converted to async, added seedTags with 30 curated tags
+- `drizzle-pg/0002_wakeful_vermin.sql` - Migration with ADD COLUMN, data migration UPDATE, DROP TABLE
+
+## Decisions Made
+- Reordered generated migration SQL to ensure data migration (UPDATE items SET global_item_id) runs before DROP TABLE item_global_links
+- Kept seed tags as flat list per D-16 (no type categorization)
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] drizzle-kit generate interactive prompt**
+- **Found during:** Task 1 (migration generation)
+- **Issue:** drizzle-kit detected table rename ambiguity between itemGlobalLinks and globalItemTags, prompting interactively
+- **Fix:** Used Bun.spawn with piped stdin to programmatically select "create table" option
+- **Files modified:** None (tooling workaround)
+- **Verification:** Migration file generated correctly
+- **Committed in:** 5df513c (Task 1 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Tooling workaround only, no code impact.
+
+## Issues Encountered
+None beyond the drizzle-kit interactive prompt handled above.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Schema foundation ready for service layer updates (plan 19-02)
+- Services referencing itemGlobalLinks, linkItemToGlobal, unlinkItemFromGlobal need updating
+- Test files referencing removed schema entities need updating
+- Client code referencing LinkToGlobalItem component needs updating
+
+---
+*Phase: 19-reference-item-model-tags-schema*
+*Completed: 2026-04-05*