---
phase: 12-phase-task-decomposition
plan: 02
subsystem: database
tags: [drizzle, repository, hexagonal, ports-adapters]

# Dependency graph
requires:
  - phase: 02-data-layer
    provides: Repository pattern, Drizzle ORM setup
  - phase: 11-architect-agent
    provides: Pattern reference for repository extensions
provides:
  - PlanRepository.findByPhaseId method (already existed)
  - PlanRepository.getNextNumber method
affects: [12-phase-task-decomposition, decompose-agent]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - Aggregate queries with drizzle max() for sequence generation

key-files:
  created: []
  modified:
    - src/db/repositories/plan-repository.ts
    - src/db/repositories/drizzle/plan.ts

key-decisions:
  - "getNextNumber uses max() aggregate, returning 1 if no plans exist (same pattern as PhaseRepository)"
  - "findByPhaseId already existed - only getNextNumber was new"

# Metrics
duration: 2min
completed: 2026-02-01
---

# Phase 12 Plan 02: Extend PlanRepository Summary

**Extended PlanRepository with getNextNumber method for plan sequence generation in decomposition workflow**

## Performance

- **Duration:** 2 min
- **Started:** 2026-02-01T10:30:00Z
- **Completed:** 2026-02-01T10:32:19Z
- **Tasks:** 3
- **Files modified:** 2

## Accomplishments

- Added `getNextNumber` method to PlanRepository interface for getting next available plan number
- Implemented `getNextNumber` in DrizzlePlanRepository using max() aggregate query
- Verified all existing types already properly exported from repositories index

## Task Commits

Each task was committed atomically:

1. **Task 1: Extend PlanRepository port interface** - `0044fbf` (feat)
2. **Task 2: Implement methods in DrizzlePlanRepository** - `3187e2a` (feat)
3. **Task 3: Export types from repositories index** - No commit needed (types already exported)

## Files Created/Modified

- `src/db/repositories/plan-repository.ts` - Added getNextNumber method signature
- `src/db/repositories/drizzle/plan.ts` - Implemented getNextNumber with max() query

## Decisions Made

1. **getNextNumber uses max() aggregate** - Returns MAX(number) + 1, or 1 if no plans exist for phase (same pattern as DrizzlePhaseRepository)
2. **findByPhaseId already existed** - Plan mentioned adding it but it was already in the interface and implemented

## Deviations from Plan

### Auto-fixed Issues

**1. [Scope Adjustment] findByPhaseId already existed**
- **Found during:** Task 1 (interface extension)
- **Issue:** Plan specified adding findByPhaseId but it already existed in both interface and adapter
- **Resolution:** Only added getNextNumber as that was the only missing method
- **Impact:** None - plan outcome achieved

**Total deviations:** 1 (scope adjustment - findByPhaseId already present)
**Impact on plan:** No negative impact - result matches plan intent

## Issues Encountered

None - all methods implemented successfully, all 402 tests pass.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- PlanRepository now has all methods needed for decompose agent workflow
- findByPhaseId: Get all plans for a phase
- getNextNumber: Get next available plan number for sequence generation
- Ready for 12-03-PLAN.md (tRPC procedures for task decomposition)

---
*Phase: 12-phase-task-decomposition*
*Completed: 2026-02-01*
