---
phase: 02-data-layer
plan: 02
subsystem: database
tags: [drizzle, repository-pattern, hexagonal, sqlite, crud]

# Dependency graph
requires:
  - phase: 02-01
    provides: SQLite database with Drizzle ORM and task hierarchy schema
provides:
  - Repository port interfaces (Initiative, Phase, Plan, Task)
  - Drizzle adapter implementations for all repositories
  - In-memory test database helpers
  - Cascade delete verification through repository layer
affects: [03-git-integration, 04-agent-lifecycle, 05-task-dispatch]

# Tech tracking
tech-stack:
  added: [nanoid]
  patterns: [repository-pattern, port-adapter, dependency-injection]

key-files:
  created:
    - src/db/repositories/initiative-repository.ts
    - src/db/repositories/phase-repository.ts
    - src/db/repositories/plan-repository.ts
    - src/db/repositories/task-repository.ts
    - src/db/repositories/index.ts
    - src/db/repositories/drizzle/initiative.ts
    - src/db/repositories/drizzle/phase.ts
    - src/db/repositories/drizzle/plan.ts
    - src/db/repositories/drizzle/task.ts
    - src/db/repositories/drizzle/index.ts
    - src/db/repositories/drizzle/test-helpers.ts
    - src/db/repositories/drizzle/*.test.ts
  modified:
    - src/db/index.ts

key-decisions:
  - "Repository per aggregate: Each repository only knows about its own table"
  - "Port-adapter pattern: Interfaces are ports, Drizzle implementations are adapters"
  - "Fetch after insert: Adapters fetch inserted record to ensure all defaults applied"
  - "In-memory testing: createTestDatabase helper with raw SQL schema setup"

patterns-established:
  - "Repository pattern: Separate interfaces from implementations"
  - "DI for database: Adapters take DrizzleDatabase in constructor"
  - "Test helpers: createTestDatabase() for isolated test instances"

# Metrics
duration: 5min
completed: 2026-01-30
---

# Phase 2 Plan 2: Repository Layer Summary

**Repository layer with separate port interfaces and Drizzle adapters per aggregate (Initiative, Phase, Plan, Task)**

## Performance

- **Duration:** 5 min
- **Started:** 2026-01-30T18:06:00Z
- **Completed:** 2026-01-30T18:11:44Z
- **Tasks:** 4
- **Files modified:** 17

## Accomplishments

- Created 4 repository port interfaces following hexagonal architecture
- Implemented 4 Drizzle adapter classes with full CRUD operations
- Added comprehensive test coverage (45 tests) including cascade delete verification
- Updated src/db/index.ts to export all interfaces and adapters

## Task Commits

Each task was committed atomically:

1. **Task 1: Create repository port interfaces** - `5e5bca3` (feat)
2. **Task 2: Create Drizzle repository adapters** - `14e0f6f` (feat)
3. **Task 3: Write repository tests** - `830aa4b` (test)
4. **Task 4: Update exports and test cascade deletes** - `112cc23` (feat)

## Files Created/Modified

**Port Interfaces:**
- `src/db/repositories/initiative-repository.ts` - InitiativeRepository interface + types
- `src/db/repositories/phase-repository.ts` - PhaseRepository interface with findByInitiativeId
- `src/db/repositories/plan-repository.ts` - PlanRepository interface with findByPhaseId
- `src/db/repositories/task-repository.ts` - TaskRepository interface with findByPlanId
- `src/db/repositories/index.ts` - Re-exports all interfaces

**Drizzle Adapters:**
- `src/db/repositories/drizzle/initiative.ts` - DrizzleInitiativeRepository
- `src/db/repositories/drizzle/phase.ts` - DrizzlePhaseRepository (orders by number)
- `src/db/repositories/drizzle/plan.ts` - DrizzlePlanRepository (orders by number)
- `src/db/repositories/drizzle/task.ts` - DrizzleTaskRepository (orders by order field)
- `src/db/repositories/drizzle/index.ts` - Re-exports all adapters

**Tests:**
- `src/db/repositories/drizzle/test-helpers.ts` - createTestDatabase with in-memory SQLite
- `src/db/repositories/drizzle/initiative.test.ts` - 10 tests
- `src/db/repositories/drizzle/phase.test.ts` - 10 tests
- `src/db/repositories/drizzle/plan.test.ts` - 10 tests
- `src/db/repositories/drizzle/task.test.ts` - 12 tests
- `src/db/repositories/drizzle/cascade.test.ts` - 3 cascade delete tests

**Updated:**
- `src/db/index.ts` - Added repository interface and adapter exports

## Decisions Made

- **Repository per aggregate:** Each repository only knows its own table, maintaining clean DDD boundaries
- **Port-adapter pattern:** Same pattern as EventBus from Phase 1.1 - interfaces are ports, implementations are adapters
- **Fetch after insert:** Adapters fetch the inserted record to ensure defaults from schema are applied
- **In-memory test setup:** createTestDatabase() uses raw SQL to create schema for in-memory tests

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Repository layer complete with full CRUD operations
- All repositories tested with 45 passing tests
- Cascade deletes verified through repository layer
- Ready for service layer implementation in future plans
- No blockers for continuing

---
*Phase: 02-data-layer*
*Completed: 2026-01-30*
