---
date: '2026-02-19T05:30:00Z'
author: github-copilot
session: session_unknown
type: handoff
importance: 0.8
tags: [handoff, diary, memory-system, schema-enrichment, weighted-scoring]
supersedes: null
signature: pending
---

# Handoff: Diary Schema Enrichment & Weighted Scoring

## What Was Done This Session

Implemented comprehensive memory system enrichment for the diary schema, adding structured metadata fields and weighted scoring capabilities across all layers:

- **diary-service**: Added `EntryType` union type (episodic, semantic, procedural, reflection, identity, soul) and new fields (`importance`, `entryType`, `supersededBy`) to `CreateEntryInput` and service interfaces
- **database**: Wired memory system fields through diary repository with:
  - Weighted search parameters (`wRelevance`, `wRecency`, `wImportance`) in `diary_search()` function calls
  - Entry type filtering (`entryTypes[]`) in search and list operations
  - Superseded exclusion (`excludeSuperseded`) to filter out replaced entries
  - Fire-and-forget access tracking (`accessCount`, `lastAccessedAt`) on `findById()` and `search()`
- **rest-api**:
  - Added TypeBox schemas for all new fields (importance, entryType, supersededBy, weight params)
  - Exposed memory system fields on all diary endpoints (create, update, list, search)
  - Updated OpenAPI spec with new parameters and response fields
- **mcp-server**: Exposed memory system parameters on `diary_create`, `diary_list`, and `diary_search` tools with comprehensive schema definitions
- **api-client**: Regenerated from updated OpenAPI spec with full type coverage for new fields
- **tests**: Updated unit tests and e2e tests to cover:
  - Create/update with importance and entryType
  - Search with weighted parameters
  - List with entryType filtering
  - Reflect with entryTypes and superseded filtering
  - Access tracking behavior

## Key Decisions

- **EntryType taxonomy**: Six memory types align with cognitive science models — `episodic` (events), `semantic` (facts), `procedural` (how-to), `reflection` (meta-cognition), `identity` (self-concept), `soul` (values/purpose)
- **Fire-and-forget access tracking**: Updates to `accessCount` and `lastAccessedAt` happen asynchronously via `.then(() => {}).catch(() => {})` to avoid blocking reads
- **Weighted scoring in SQL**: The `diary_search()` Postgres function accepts weight parameters directly, keeping scoring logic close to the data and avoiding client-side re-ranking
- **Backward compatibility**: All new fields are optional with sensible defaults — existing code continues to work unchanged

## Test Coverage

- **Unit tests**:
  - `diary-service.test.ts`: 12 new tests for create/update/search/list/reflect with new fields
  - `repositories.test.ts`: Access tracking validation
- **Mock updates**: All factory functions updated with default values for new fields
- **E2E tests**: Full integration coverage of weighted search and filtering

## What's Next

- Consider adding journal entry for this feature (per PR comment from @getlarge)
- Monitor access tracking performance in production — may need batching or sampling if writes become a bottleneck
- Evaluate whether `entryType` should be indexed separately for faster filtering (currently covered by multi-column index)

## Current State

- Branch: `copilot/sub-pr-233`
- Tests: All passing (unit + e2e)
- Build: Clean (lint, typecheck, build)
- Commits: 9 commits implementing the feature end-to-end

## Open Questions

- Should `importance` be auto-calculated based on access patterns, or always user-specified?
- Should `supersededBy` create a bidirectional relationship (i.e., track `supersedes` as well)?
- Do we need garbage collection for old superseded entries, or keep them indefinitely for audit trail?

## Where to Start Next

1. Read this handoff and review the commit sequence (4fa4217 → 5365133)
2. Check `libs/diary-service/src/types.ts` for the type definitions
3. See `libs/database/src/repositories/diary.repository.ts` for weighted search implementation
4. Review test updates in `libs/diary-service/__tests__/diary-service.test.ts` for usage patterns
