---
phase: 14-parallel-phase-execution
plan: 01
subsystem: database
tags: [drizzle, sqlite, schema, dependencies]

# Dependency graph
requires:
  - phase: 02
    provides: task_dependencies table pattern
provides:
  - phase_dependencies table
  - PhaseRepository dependency methods
affects: [14-parallel-phase-execution]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - phase dependency mirroring task dependency pattern

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

key-decisions:
  - "Mirrored task_dependencies table structure exactly for phase_dependencies"
  - "Used same FK cascade delete pattern for phase dependencies"
  - "getDependencies returns IDs only (not full Phase objects) for lightweight queries"

patterns-established:
  - "Dependency table pattern: id, parentId, dependsOnParentId, createdAt"
  - "Bidirectional query methods: getDependencies (what I need) vs getDependents (who needs me)"

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

# Phase 14 Plan 01: Phase Dependencies Schema Summary

**Phase dependencies table and repository methods mirroring the task_dependencies pattern for parallel execution prerequisite tracking**

## Performance

- **Duration:** 2 min
- **Started:** 2026-02-02T12:31:52Z
- **Completed:** 2026-02-02T12:33:19Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments

- Added phase_dependencies table to schema with cascade delete FKs
- Extended phases relations with dependsOn and dependents many relations
- Added createDependency, getDependencies, getDependents to PhaseRepository interface
- Implemented all methods in DrizzlePhaseRepository following task dependency pattern
- Exported PhaseDependency and NewPhaseDependency types

## Task Commits

Each task was committed atomically:

1. **Task 1: Add phase_dependencies table to schema** - `a55d08f` (feat)
2. **Task 2: Add dependency methods to PhaseRepository** - `8e68a6e` (feat)

## Files Created/Modified

- `src/db/schema.ts` - Added phase_dependencies table, phaseDependenciesRelations, extended phasesRelations with dependency relations, exported types
- `src/db/repositories/phase-repository.ts` - Added createDependency, getDependencies, getDependents method signatures
- `src/db/repositories/drizzle/phase.ts` - Implemented all three dependency methods

## Decisions Made

- Mirrored task_dependencies exactly: same column names (phaseId/dependsOnPhaseId), same FK constraints
- getDependencies and getDependents return string[] (IDs only) rather than full Phase objects for query efficiency
- Used nanoid for dependency IDs matching existing pattern

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Phase dependencies schema ready for parallel execution logic
- Repository provides all methods needed to track and query phase dependencies
- Ready for plan 14-02

---
*Phase: 14-parallel-phase-execution*
*Completed: 2026-02-02*
