---
phase: 01-foundation
plan: 03
subsystem: database
tags: [sqlalchemy, async, aiosqlite, pytest, testing]

# Dependency graph
requires:
  - phase: 01-foundation/01-02
    provides: SQLAlchemy models (Project, Discussion, Round, Message, Consensus)
provides:
  - Async database session management (init_db, create_tables, get_session, close_db)
  - In-memory database testing pattern
  - Model test coverage (5 tests)
affects: [02-bot-core, 03-discussion-engine]

# Tech tracking
tech-stack:
  added: [sqlalchemy.ext.asyncio, aiosqlite]
  patterns: [async context manager for sessions, in-memory SQLite for tests]

key-files:
  created:
    - src/moai/core/database.py
    - tests/test_models.py

key-decisions:
  - "Session auto-commits on context exit, rollback on exception"
  - "Module-level globals for engine/session factory (simple singleton pattern)"
  - "expire_on_commit=False for async session usability"

patterns-established:
  - "Database fixture pattern: init_db with in-memory URL, create_tables, yield session, close_db"
  - "Relationship testing via refresh() for lazy-loaded collections"

issues-created: []

# Metrics
duration: 4min
completed: 2026-01-16
---

# Phase 01-03: Database & Tests Summary

**Async SQLAlchemy session management with in-memory test fixture and 5 model tests at 95% coverage**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-16T15:13:19Z
- **Completed:** 2026-01-16T15:17:06Z
- **Tasks:** 3 (2 with commits, 1 verification-only)
- **Files modified:** 2

## Accomplishments
- Created database.py with async session factory and context manager
- Implemented 5 comprehensive model tests covering creation, relationships, and cascades
- Achieved 95% code coverage on core module

## Task Commits

Each task was committed atomically:

1. **Task 1: Create database module** - `bb932e6` (feat)
2. **Task 2: Create model tests** - `fb81fea` (test)
3. **Task 3: Verify gitignore and test suite** - No commit needed (entries already present)

## Files Created/Modified
- `src/moai/core/database.py` - Async session management with init_db, create_tables, get_session, close_db
- `tests/test_models.py` - 5 tests: create_project, create_discussion_with_project, create_full_discussion_chain, create_consensus, project_cascade_delete

## Decisions Made
- Used `expire_on_commit=False` in session factory to allow attribute access after commit without re-query
- Session context manager handles commit/rollback automatically
- Module-level globals for engine/factory simplifies dependency injection for this Phase 1 scope

## Deviations from Plan

None - plan executed exactly as written.

**Note:** Task 3 required no commit because `.gitignore` already contained all specified entries from a previous setup phase.

## Issues Encountered
None

## Test Results

```
tests/test_models.py::test_create_project PASSED
tests/test_models.py::test_create_discussion_with_project PASSED
tests/test_models.py::test_create_full_discussion_chain PASSED
tests/test_models.py::test_create_consensus PASSED
tests/test_models.py::test_project_cascade_delete PASSED

Coverage: 95% (101 statements, 5 missing)
Missing: error handling paths in database.py (lines 62, 85, 91-93)
```

## Next Phase Readiness
- Foundation phase complete: scaffolding, models, database all working
- Ready for Phase 2: Bot Core (handlers, middleware, bot setup)
- All core infrastructure tested and operational

---
*Phase: 01-foundation*
*Completed: 2026-01-16*