docs(14-01): complete phase dependencies schema plan

Tasks completed: 2/2
- Add phase_dependencies table to schema
- Add dependency methods to PhaseRepository

SUMMARY: .planning/phases/14-parallel-phase-execution/14-01-SUMMARY.md

.planning/phases/14-parallel-phase-execution/14-01-SUMMARY.md

@@ -0,0 +1,102 @@
+---
+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*