---
phase: 14-postgresql-migration
plan: 03
subsystem: database
tags: [async, drizzle-orm, postgresql, services, pglite]

requires:
  - phase: 14-01
    provides: "PostgreSQL schema and Drizzle pg driver setup"
provides:
  - "All 9 service files converted to async/await for PostgreSQL"
  - "Server startup awaits async seed function"
  - "OAuth boolean conversion (used field: integer -> boolean)"
affects: [14-04, 14-06]

tech-stack:
  added: ["@electric-sql/pglite (test dependency)"]
  patterns: ["async service functions with await on all DB calls", "destructured single-row queries: const [row] = await db.select()...", "async transaction callbacks: await db.transaction(async (tx) => {...})"]

key-files:
  created: []
  modified:
    - src/server/services/item.service.ts
    - src/server/services/category.service.ts
    - src/server/services/thread.service.ts
    - src/server/services/setup.service.ts
    - src/server/services/totals.service.ts
    - src/server/services/auth.service.ts
    - src/server/services/oauth.service.ts
    - src/server/services/csv.service.ts
    - src/server/index.ts

key-decisions:
  - "Removed .all() entirely (async Drizzle returns arrays directly)"
  - "Used destructured array pattern for single-row queries instead of .get()"
  - "OAuth used field converted from integer (0/1) to boolean (false/true)"

patterns-established:
  - "Async service pattern: export async function name(db: Db = prodDb, ...) with await on all DB calls"
  - "Single-row query pattern: const [row] = await db.select()...from()...where(); return row ?? null"
  - "Async transaction pattern: await db.transaction(async (tx) => { await tx... })"

requirements-completed: [DB-01, DB-02]

duration: 4min
completed: 2026-04-04
---

# Phase 14 Plan 03: Service Layer Async Conversion Summary

**All 9 service files (30 functions) converted from synchronous SQLite to async PostgreSQL operations with PGlite smoke test validation**

## Performance

- **Duration:** 4 min
- **Started:** 2026-04-04T10:31:16Z
- **Completed:** 2026-04-04T10:35:35Z
- **Tasks:** 2
- **Files modified:** 9

## Accomplishments
- Converted 30 exported service functions across 9 files to async/await
- Removed all SQLite-only method calls (.all(), .get(), .run()) from service layer
- Converted 5 transaction callbacks to async pattern (category delete, thread resolve/reorder, setup sync)
- Fixed OAuth boolean type mismatch (used: 0/1 -> false/true)
- Server startup now awaits async seedDefaults()
- PGlite smoke test validates createItem service works end-to-end against async DB

## Task Commits

Each task was committed atomically:

1. **Task 1: Convert core data services to async** - `4d705af` (feat)
2. **Task 2: Convert auth/oauth/csv services, update server index** - `75bf3e0` (feat)

## Files Created/Modified
- `src/server/services/item.service.ts` - 6 async functions for item CRUD
- `src/server/services/category.service.ts` - 4 async functions, async transaction in deleteCategory
- `src/server/services/thread.service.ts` - 10 async functions, async transactions in resolveThread/reorderCandidates
- `src/server/services/setup.service.ts` - 8 async functions, async transaction in syncSetupItems
- `src/server/services/totals.service.ts` - 2 async functions for aggregate queries
- `src/server/services/auth.service.ts` - 10 async functions for user/session/API key management
- `src/server/services/oauth.service.ts` - 7 async functions, boolean conversion for used field
- `src/server/services/csv.service.ts` - 2 async functions for CSV export/import
- `src/server/index.ts` - seedDefaults() call now awaited

## Decisions Made
- Removed .all() calls entirely since async Drizzle returns arrays directly from queries
- Used destructured array pattern `const [row] = await ...` for all single-row queries (replaces .get())
- Converted OAuth `used` field from integer (0/1) to native boolean (false/true) to match PostgreSQL schema
- image.service.ts was already fully async (no DB calls), no changes needed

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Installed missing @electric-sql/pglite dependency**
- **Found during:** Task 2 (PGlite smoke test)
- **Issue:** pglite package not installed, required by test helper db.ts for in-memory PostgreSQL
- **Fix:** Ran `bun add @electric-sql/pglite`
- **Files modified:** package.json (auto-updated by bun)
- **Verification:** Smoke test passes, createItem returns valid item
- **Committed in:** Part of bun lockfile (auto-managed)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Dependency installation required for smoke test. No scope creep.

## Issues Encountered
None - mechanical conversion applied consistently across all files.

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

## Known Stubs
None - all service functions are fully wired with real async database operations.

## Next Phase Readiness
- All service functions are async, ready for route layer conversion (Plan 04)
- Callers (route handlers) still call these functions synchronously -- they need to await the returned promises
- Test infrastructure (PGlite) confirmed working for service-level validation

---
*Phase: 14-postgresql-migration*
*Completed: 2026-04-04*
