[QA] ✅ VERIFIED - All requirements met. 18/18 tests passing, linting clean, schema matches PLAN.md exactly. Production-ready, approved for next phase. Full report: /tmp/qa-CDEV-2.md

Implemented database models and session management: ## Changes Made - **app/db/models.py**: Created SQLAlchemy models for Container, Job, and ApiKey matching PLAN.md schema - Container: Tracks managed Incus containers with all fields (name, image_type, profile, status, IPs, git info, etc.) - Job: Tracks async operations with progress tracking and JSON payloads - ApiKey: API key management with hash, name, active status, and expiration - **app/db/session.py**: Async session factory with: - `get_database_url()` - reads DATABASE_PATH from env - `init_db()` / `close_db()` - lifecycle management - `get_session()` - async context manager for sessions - `get_db()` - FastAPI dependency - **app/db/__init__.py**: Exports all models and session functions - **pyproject.toml**: Added aiosqlite dependency for async SQLite support - **tests/conftest.py**: Test fixtures for in-memory SQLite sessions - **tests/test_db_models.py**: 18 unit tests covering: - Model creation with required/optional fields - Unique constraint validation (container names, API key hashes) - Database round-trip (save and reload) - __repr__ methods ## Verification - All 18 tests pass: make test - Linting passes: make lint