---
phase: 04-cross-framework-linking
plan: 01
subsystem: storage
tags: [zod, entity-linking, typescript, storage]
# Dependency graph
requires:
- phase: 03-combined-tool
provides: BaseEntitySchema, storage layer with CRUD operations
provides:
- LinkedEntitySchema for entity references
- linkEntities/unlinkEntities/getLinkedEntities storage helpers
- Comprehensive linking tests
affects: [04-02, 04-03, MCP tool registration]
# Tech tracking
tech-stack:
added: []
patterns: [one-way entity linking with optional relationships]
key-files:
created:
- src/storage/linking.test.ts
modified:
- src/schemas/index.ts
- src/storage/index.ts
key-decisions:
- "One-way linking: source links to target, not bidirectional"
- "Links stored in source entity's linkedEntities array"
- "EntityTypeEnum reused in ProjectSchema for DRY"
patterns-established:
- "Entity linking via linkedEntities optional array on all entities"
- "Relationship descriptors are optional strings (informs, validates, supports)"
# Metrics
duration: 8min
completed: 2026-01-15
---
# Phase 4 Plan 1: Add Linking Schema and Storage Summary
**Entity linking infrastructure with LinkedEntitySchema, storage helpers, and 15 comprehensive tests**
## Performance
- **Duration:** 8 min
- **Started:** 2026-01-15T00:10:00Z
- **Completed:** 2026-01-15T00:18:00Z
- **Tasks:** 3
- **Files modified:** 3
## Accomplishments
- Added LinkedEntitySchema with id, type, and optional relationship field
- Extended BaseEntitySchema with optional linkedEntities array
- Implemented linkEntities, unlinkEntities, and getLinkedEntities storage helpers
- Added 15 comprehensive tests covering all linking scenarios
## Task Commits
Each task was committed atomically:
1. **Task 1: Add LinkedEntitySchema to schemas** - `32134d9` (feat)
2. **Task 2: Add link/unlink storage helpers** - `a747150` (feat)
3. **Task 3: Add tests for linking functionality** - `c1c5abc` (test)
## Files Created/Modified
- `src/schemas/index.ts` - Added EntityTypeEnum, LinkedEntitySchema, extended BaseEntitySchema
- `src/storage/index.ts` - Added linkEntities, unlinkEntities, getLinkedEntities functions
- `src/storage/linking.test.ts` - 15 tests for linking functionality
## Decisions Made
- One-way linking: source entity stores links, not bidirectional
- Refactored ProjectSchema to reuse EntityTypeEnum (DRY principle)
- Links prevent duplicates by checking target ID before adding
- Cross-project linking explicitly disallowed with validation error
## Deviations from Plan
None - plan executed exactly as written.
## Issues Encountered
None.
## User Setup Required
None - no external service configuration required.
## Next Phase Readiness
- Linking infrastructure complete
- Ready for 04-02: MCP tool registration for link operations
- Ready for 04-03: Cross-reference display in entity views
---
*Phase: 04-cross-framework-linking*
*Completed: 2026-01-15*
