---
phase: 19-reference-item-model-tags-schema
plan: 03
subsystem: api
tags: [drizzle, postgresql, coalesce, global-items, tags, csv]

requires:
  - phase: 19-reference-item-model-tags-schema (plan 01)
    provides: globalItems, tags, globalItemTags schema tables, items.globalItemId FK
provides:
  - Tag-filtered global item search with AND intersection logic
  - COALESCE merge pattern in all secondary services (setup, totals, profile, CSV)
  - Owner count via direct items.globalItemId FK
affects: [client-catalog, client-setup-views, client-profile]

tech-stack:
  added: []
  patterns: [COALESCE merge for reference item data across all query surfaces]

key-files:
  created: []
  modified:
    - src/server/services/global-item.service.ts
    - src/server/services/setup.service.ts
    - src/server/services/totals.service.ts
    - src/server/services/profile.service.ts
    - src/server/services/csv.service.ts
    - src/server/routes/global-items.ts
    - tests/services/global-item.service.test.ts

key-decisions:
  - "COALESCE merge pattern propagated to all 4 secondary services consistently"

patterns-established:
  - "COALESCE merge: all services reading item weight/price LEFT JOIN globalItems and COALESCE when globalItemId is set"
  - "Tag AND filtering: subquery with GROUP BY HAVING COUNT(DISTINCT) for intersection logic"

requirements-completed: [CATFLOW-04, TAG-01, TAG-02]

duration: 12min
completed: 2026-04-06
---

# Phase 19 Plan 03: Global Item Tag Filtering and Secondary Service COALESCE Merge Summary

**Tag-filtered global item search with AND logic, owner count via direct FK, and COALESCE merge propagated to setup/totals/profile/CSV services**

## Performance

- **Duration:** 12 min
- **Started:** 2026-04-05T22:05:16Z
- **Completed:** 2026-04-05T22:17:00Z
- **Tasks:** 2
- **Files modified:** 7

## Accomplishments
- Global item search supports tag filtering with AND intersection logic via subquery GROUP BY HAVING
- Owner count migrated from removed itemGlobalLinks to direct items.globalItemId FK
- All 4 secondary services (setup, totals, profile, CSV) LEFT JOIN globalItems and COALESCE weight/price/name for reference items
- Route handlers made async with tag query parameter parsing

## Task Commits

Each task was committed atomically:

1. **Task 1: Global item service tag filtering + owner count migration + tests** - `ecc6ac6` (feat) -- pre-existing from wave execution
2. **Task 2: Secondary service COALESCE merge propagation** - `0a233c7` (feat)

## Files Created/Modified
- `src/server/services/global-item.service.ts` - Tag-filtered search with ilike and AND logic, owner count via items.globalItemId
- `src/server/services/setup.service.ts` - COALESCE merge in getAllSetups totals and getSetupWithItems item list
- `src/server/services/totals.service.ts` - COALESCE merge in getCategoryTotals and getGlobalTotals
- `src/server/services/profile.service.ts` - COALESCE merge in getPublicProfile totals and getPublicSetupWithItems
- `src/server/services/csv.service.ts` - COALESCE merge in exportItemsCsv for name/weight/price
- `src/server/routes/global-items.ts` - Async handlers, tags query param parsing
- `tests/services/global-item.service.test.ts` - Full async PGlite tests for tag filtering and owner count

## Decisions Made
- COALESCE merge pattern applied consistently across all 4 secondary services using the same LEFT JOIN + CASE WHEN pattern established in plan 02

## Deviations from Plan
None - plan executed exactly as written. Task 1 was already completed from a prior execution wave.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Known Stubs
None - all services fully wired with COALESCE merge pattern.

## Next Phase Readiness
- All server-side query surfaces now correctly merge global item data for reference items
- Client components can rely on merged data from all API endpoints
- Ready for client-side catalog and discovery UI work

---
*Phase: 19-reference-item-model-tags-schema*
*Completed: 2026-04-06*
