docs(02-01): complete thread backend API plan
- Created 02-01-SUMMARY.md with execution results - Updated STATE.md with phase 2 position and decisions - Updated ROADMAP.md with plan progress - Marked THRD-01 through THRD-04 requirements complete Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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---
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phase: 02-planning-threads
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plan: 01
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subsystem: api
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tags: [drizzle, hono, sqlite, tdd, threads, candidates, transactions]
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requires:
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- phase: 01-foundation-and-collection
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provides: items table, item.service.ts DI pattern, test helper, Hono route pattern
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provides:
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- threads and threadCandidates database tables
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- Thread service with full CRUD and transactional resolution
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- Thread API routes at /api/threads with nested candidate endpoints
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- Zod validation schemas for threads, candidates, and resolution
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- Shared TypeScript types for Thread and ThreadCandidate
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affects: [02-planning-threads, 03-setups-and-dashboard]
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tech-stack:
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added: []
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patterns: [correlated SQL subqueries for aggregate metadata, transactional resolution pattern]
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key-files:
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created:
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- src/server/services/thread.service.ts
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- src/server/routes/threads.ts
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- tests/services/thread.service.test.ts
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- tests/routes/threads.test.ts
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modified:
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- src/db/schema.ts
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- src/shared/schemas.ts
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- src/shared/types.ts
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- src/server/index.ts
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- tests/helpers/db.ts
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key-decisions:
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- "Drizzle sql template literals use raw table.column references in correlated subqueries (not interpolated column objects)"
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- "Thread deletion collects candidate image filenames before cascade delete for filesystem cleanup"
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- "Resolution validates categoryId existence and falls back to Uncategorized (id=1)"
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patterns-established:
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- "Correlated subquery pattern: raw SQL references in Drizzle sql`` for aggregate columns (candidateCount, minPrice, maxPrice)"
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- "Transaction pattern: resolveThread atomically creates item + archives thread in single db.transaction()"
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- "Nested route pattern: candidates CRUD mounted under /api/threads/:id/candidates"
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requirements-completed: [THRD-01, THRD-02, THRD-03, THRD-04]
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duration: 5min
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completed: 2026-03-15
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---
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# Phase 2 Plan 01: Thread Backend API Summary
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**Thread and candidate CRUD API with transactional resolution that atomically creates collection items from winning candidates using Drizzle transactions**
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## Performance
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- **Duration:** 5 min
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- **Started:** 2026-03-15T10:34:32Z
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- **Completed:** 2026-03-15T10:39:24Z
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- **Tasks:** 2
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- **Files modified:** 9
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## Accomplishments
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- Full thread CRUD (create, read, update, delete) with cascading candidate cleanup
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- Full candidate CRUD with all item-compatible fields (name, weight, price, category, notes, productUrl, image)
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- Thread list returns aggregate metadata (candidateCount, minPriceCents, maxPriceCents) via correlated subqueries
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- Transactional thread resolution: atomically creates collection item from candidate data and archives thread
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- 33 tests (19 unit + 14 integration) all passing with zero regressions on existing 30 Phase 1 tests
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## Task Commits
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Each task was committed atomically (TDD: RED then GREEN):
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1. **Task 1: Schema, shared schemas, test helper, and service layer**
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- `e146eea` (test) - RED: failing tests for thread service
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- `1a8b91e` (feat) - GREEN: implement thread service
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2. **Task 2: Thread API routes with integration tests**
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- `37c9999` (test) - RED: failing integration tests for thread routes
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- `add3e33` (feat) - GREEN: implement thread routes and mount
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## Files Created/Modified
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- `src/db/schema.ts` - Added threads and threadCandidates table definitions
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- `src/shared/schemas.ts` - Added Zod schemas for thread/candidate/resolve validation
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- `src/shared/types.ts` - Added Thread, ThreadCandidate, and related input types
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- `src/server/services/thread.service.ts` - Thread and candidate business logic with resolution transaction
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- `src/server/routes/threads.ts` - Hono API routes for threads and candidates
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- `src/server/index.ts` - Mounted threadRoutes at /api/threads
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- `tests/helpers/db.ts` - Added threads and thread_candidates table creation
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- `tests/services/thread.service.test.ts` - 19 unit tests for thread service
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- `tests/routes/threads.test.ts` - 14 integration tests for thread API
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## Decisions Made
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- Used raw SQL table.column references in Drizzle `sql` template literals for correlated subqueries (interpolated column objects bind as parameters, not column references)
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- Thread deletion collects candidate image filenames before cascade delete to enable filesystem cleanup
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- Resolution validates categoryId existence and falls back to Uncategorized (id=1) to handle deleted categories
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed correlated subquery column reference in getAllThreads**
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- **Found during:** Task 1 (GREEN phase)
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- **Issue:** Drizzle `sql` template literal with `${threads.id}` binds as a parameter value, not a SQL column reference, causing COUNT to return 1 instead of correct count
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- **Fix:** Changed to raw SQL reference `threads.id` instead of interpolated `${threads.id}` in correlated subqueries
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- **Files modified:** src/server/services/thread.service.ts
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- **Verification:** candidateCount returns correct values in tests
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- **Committed in:** 1a8b91e (Task 1 GREEN commit)
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---
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**Total deviations:** 1 auto-fixed (1 bug)
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**Impact on plan:** Essential fix for correct aggregate metadata. No scope creep.
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## Issues Encountered
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None beyond the subquery fix documented above.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Thread API fully operational, ready for frontend consumption in Plan 02
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- All endpoints follow established Phase 1 patterns (DI, Hono context, Zod validation)
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- Test infrastructure updated to support threads in all future tests
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---
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*Phase: 02-planning-threads*
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*Completed: 2026-03-15*
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## Self-Check: PASSED
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All 8 files verified present. All 4 commit hashes verified in git log.
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