docs(01-02): complete PostgreSQL database setup plan

Tasks completed: 2/2
- Set up PostgreSQL with Docker and async session factory
- Configure Alembic and create Build model

SUMMARY: .planning/phases/01-core-infrastructure-security/01-02-SUMMARY.md

.planning/ROADMAP.md

@@ -39,7 +39,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 
 Plans:
 - [x] 01-01-PLAN.md — FastAPI project setup with health endpoints
-- [ ] 01-02-PLAN.md — PostgreSQL database with async SQLAlchemy and Alembic
+- [x] 01-02-PLAN.md — PostgreSQL database with async SQLAlchemy and Alembic
 - [ ] 01-03-PLAN.md — Security middleware (rate limiting, CSRF, headers)
 - [ ] 01-04-PLAN.md — Caddy HTTPS and database backup automation
 - [ ] 01-05-PLAN.md — systemd-nspawn sandbox with deterministic builds
@@ -189,7 +189,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
-| 1. Core Infrastructure & Security | 1/5 | In progress | - |
+| 1. Core Infrastructure & Security | 2/5 | In progress | - |
 | 2. Overlay System Foundation | 0/TBD | Not started | - |
 | 3. Build Queue & Workers | 0/TBD | Not started | - |
 | 4. User Accounts | 0/TBD | Not started | - |

.planning/STATE.md

@@ -10,27 +10,27 @@ See: .planning/PROJECT.md (updated 2026-01-25)
 ## Current Position
 
 Phase: 1 of 9 (Core Infrastructure & Security)
-Plan: 1 of 5 in current phase
+Plan: 2 of 5 in current phase
 Status: In progress
-Last activity: 2026-01-25 - Completed 01-01-PLAN.md
+Last activity: 2026-01-25 - Completed 01-02-PLAN.md
 
-Progress: [█░░░░░░░░░] 2%
+Progress: [██░░░░░░░░] 4%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 1
+- Total plans completed: 2
-- Average duration: 3 min
+- Average duration: 4.5 min
-- Total execution time: 3 min
+- Total execution time: 9 min
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| 01 | 1 | 3 min | 3 min |
+| 01 | 2 | 9 min | 4.5 min |
 
 **Recent Trend:**
-- Last 5 plans: 01-01 (3 min)
+- Last 5 plans: 01-01 (3 min), 01-02 (6 min)
 - Trend: N/A (not enough data)
 
 *Updated after each plan completion*
@@ -45,6 +45,8 @@ Recent decisions affecting current work:
 - [Roadmap]: 9-phase structure following research recommendations - infrastructure first, then backend systems, then user features, then polish
 - [01-01]: Used hatchling as build backend for pyproject.toml
 - [01-01]: Created root /health endpoint outside versioned API for simple health checks
+- [01-02]: Port 5433 for PostgreSQL (5432 in use by another container)
+- [01-02]: Connection pool settings from research: pool_size=10, max_overflow=20, pool_recycle=1800
 
 ### Pending Todos
 
@@ -64,6 +66,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-01-25T20:09:42Z
+Last session: 2026-01-25T20:12:01Z
-Stopped at: Completed 01-01-PLAN.md
+Stopped at: Completed 01-02-PLAN.md
 Resume file: None

.planning/phases/01-core-infrastructure-security/01-02-SUMMARY.md

@@ -0,0 +1,114 @@
+---
+phase: 01-core-infrastructure-security
+plan: 02
+subsystem: database
+tags: [postgresql, sqlalchemy, alembic, asyncpg, docker]
+
+# Dependency graph
+requires:
+  - phase: 01-01
+    provides: FastAPI project structure, pydantic-settings configuration
+provides:
+  - PostgreSQL database with Docker container
+  - Async SQLAlchemy session factory with connection pooling
+  - Alembic migration infrastructure for async
+  - Build model for tracking ISO generation jobs
+affects: [01-03, 01-04, 01-05, 02, 03]
+
+# Tech tracking
+tech-stack:
+  added: [postgresql:16-alpine, asyncpg, alembic]
+  patterns: [async-session-management, connection-pooling, uuid-primary-keys]
+
+key-files:
+  created:
+    - backend/app/db/session.py
+    - backend/app/db/base.py
+    - backend/app/db/models/build.py
+    - backend/alembic/env.py
+    - docker-compose.yml
+  modified:
+    - .env.example
+
+key-decisions:
+  - "Use port 5433 for PostgreSQL to avoid conflict with existing postgres containers"
+  - "Connection pool: pool_size=10, max_overflow=20, pool_recycle=1800 (from research)"
+  - "Build model uses UUID primary key and SHA-256 config_hash for caching"
+
+patterns-established:
+  - "Async session factory pattern with get_db() dependency"
+  - "Alembic async migrations using asyncio.run()"
+  - "Models inherit from DeclarativeBase and are imported in env.py"
+
+# Metrics
+duration: 6min
+completed: 2026-01-25
+---
+
+# Phase 1 Plan 2: PostgreSQL Database Setup Summary
+
+**PostgreSQL 16 with async SQLAlchemy session factory, Alembic migrations, and Build tracking model**
+
+## Performance
+
+- **Duration:** 6 min
+- **Started:** 2026-01-25T20:06:20Z
+- **Completed:** 2026-01-25T20:12:01Z
+- **Tasks:** 2
+- **Files modified:** 13
+
+## Accomplishments
+
+- PostgreSQL 16 running in Docker container with health checks (port 5433)
+- Async SQLAlchemy engine with production-grade connection pooling
+- Alembic configured for async migrations with autogenerate support
+- Build model created with UUID primary key, status enum, and indexes
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Set up PostgreSQL with Docker and async session factory** - `fbcd2bb` (feat)
+2. **Task 2: Configure Alembic and create Build model** - `c261664` (feat)
+
+## Files Created/Modified
+
+- `docker-compose.yml` - PostgreSQL 16 container configuration (port 5433)
+- `backend/app/db/session.py` - Async engine and session factory with pooling
+- `backend/app/db/base.py` - SQLAlchemy 2.0 DeclarativeBase
+- `backend/app/db/__init__.py` - Database package exports
+- `backend/app/db/models/build.py` - Build tracking model with status enum
+- `backend/app/db/models/__init__.py` - Models package exports
+- `backend/alembic.ini` - Alembic configuration
+- `backend/alembic/env.py` - Async migration environment
+- `backend/alembic/versions/de1460a760b0_create_build_table.py` - Initial migration
+- `.env.example` - Updated DATABASE_URL to port 5433
+
+## Decisions Made
+
+1. **Port 5433 instead of 5432** - Another PostgreSQL container was using port 5432; used 5433 to avoid conflict
+2. **Connection pooling settings** - Applied research recommendations: pool_size=10, max_overflow=20, pool_recycle=1800, pool_pre_ping=True
+3. **Build model design** - UUID primary key for security, config_hash for deterministic caching, status enum for queue management
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+- Port 5432 was already allocated by another postgres container (moai-postgres)
+- Resolution: Changed to port 5433 in docker-compose.yml and updated all configurations
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Database infrastructure complete and running
+- Ready for 01-03-PLAN.md (Security middleware)
+- Build model available for queue and worker implementation in Phase 3
+
+---
+*Phase: 01-core-infrastructure-security*
+*Completed: 2026-01-25*