---
date: '2026-02-05T16:30:00Z'
author: claude-opus-4-5-20251101
session: unknown
type: handoff
importance: 0.8
tags: [handoff, dbos, transaction-discipline, diary-service, database]
supersedes: null
signature: pending
---

# Handoff: DBOS Transaction Discipline Integration

## What Was Done This Session

- Switched database driver from `postgres-js` to `pg` (required by DBOS DrizzleDataSource)
- Added DBOS SDK initialization module (`libs/database/src/dbos.ts`)
- Created Keto durable workflows with automatic retry (5 attempts, exponential backoff)
- Created DBOS Fastify plugin for REST API integration
- Migrated diary-service to use DBOS transactions when available
- Fixed e2e tests to work with new `createDatabase()` return type
- Wrote design document: `docs/plans/2026-02-05-transaction-discipline-design.md`

## What's Not Done Yet

- Production wiring: The DBOS plugin is ready but not integrated into `apps/server`
- DBOS schema migration: Need to run DBOS migrations in production DB
- Monitoring: No DBOS workflow observability configured yet

## Current State

- Branch: `feature/dbos-transaction-discipline`
- Tests: All passing (unit + 66 e2e tests)
- Build: Clean typecheck across all 13 packages

## Key Files Created/Modified

| File                                            | Purpose                                       |
| ----------------------------------------------- | --------------------------------------------- |
| `libs/database/src/db.ts`                       | Switched to pg driver, returns `{ db, pool }` |
| `libs/database/src/dbos.ts`                     | DBOS initialization, DrizzleDataSource setup  |
| `libs/database/src/workflows/keto-workflows.ts` | Durable Keto operations                       |
| `apps/rest-api/src/plugins/dbos.ts`             | Fastify plugin for DBOS lifecycle             |
| `libs/diary-service/src/diary-service.ts`       | Dual-mode: DBOS or fallback                   |

## Decisions Made

- **Eventual consistency model**: DB commits first, then durable Keto workflow fires
- **Dual execution paths**: diary-service works with or without DBOS (backward compatible)
- **Retry config**: 5 attempts, 2s base interval, 2x backoff (max ~62s total wait)
- **KetoRelationshipWriter interface**: Injected at runtime before `DBOS.launch()`
- **DBOS Conductor not required**: Basic durable workflows work without it

## Commits Ready for PR

```
6b826c4 feat(diary-service): migrate to DBOS transactions
f09b397 docs: add transaction discipline design document
d86ae19 feat(rest-api): add DBOS Fastify plugin
0f54e68 feat(database): add Keto durable workflows
61dd344 feat(database): add DBOS initialization and DrizzleDataSource
a5988ee feat(database): switch from postgres-js to pg driver
```

## Technical Notes

### pnpm Virtual Store Issue

When modifying workspace package exports, TypeScript may fail to see new exports due to stale pnpm virtual store. Fix:

```bash
rm -rf node_modules/.pnpm/@moltnet* && pnpm install
```

This is documented in `/Users/edouard/.claude/projects/-Users-edouard-Dev-getlarge-themoltnet/memory/MEMORY.md`.

### DBOS Initialization Order

1. `setKetoRelationshipWriter()` — before DBOS.launch()
2. `initDBOS({ databaseUrl })` — creates DrizzleDataSource
3. `launchDBOS()` — starts DBOS runtime, recovers workflows

## Where to Start Next

1. Create PR from `feature/dbos-transaction-discipline` to `main`
2. For production deployment: wire DBOS plugin into `apps/server`
3. Consider adding DBOS workflow monitoring/observability
