---
phase: 01-foundation
plan: 02
subsystem: database
tags: [quill, postgresql, hikaricp, flyway, zio, migrations]

# Dependency graph
requires:
  - phase: 01-01
    provides: Mill build with ZIO HTTP server and HOCON configuration
provides:
  - Quill PostgreSQL context with compile-time SQL validation
  - Flyway migration service as ZIO effect
  - V1 migration creating summer_users table
  - /ready endpoint for database connectivity checks
affects: [02-plugin-system, 03-user-auth, 05-cli-scaffolding]

# Tech tracking
tech-stack:
  added: [quill-jdbc-zio 4.8.5, flyway-core 10.21.0, flyway-database-postgresql 10.21.0, postgresql 42.7.4]
  patterns: [ZIO layers for database access, HikariCP connection pooling, SnakeCase naming strategy]

key-files:
  created:
    - summercms/src/db/QuillContext.scala
    - summercms/src/db/Migrator.scala
    - summercms/resources/db/migration/V1__create_summer_users.sql
  modified:
    - summercms/resources/application.conf
    - summercms/src/api/HealthRoutes.scala
    - summercms/src/api/Routes.scala
    - summercms/src/Main.scala

key-decisions:
  - "Use 'hikari' prefix for HikariCP config to avoid conflict with ZIO config 'database' prefix"
  - "Migrations run via CLI only, not auto-run on startup"
  - "summer_migrations table name instead of default flyway_schema_history"

patterns-established:
  - "ZLayer composition: dataSourceLayer >>> quillLayer for full database access"
  - "SnakeCase naming strategy: Scala camelCase fields map to PostgreSQL snake_case columns"
  - "Liveness vs readiness probes: /health always 200, /ready checks database"

# Metrics
duration: 35min
completed: 2026-02-04
---

# Phase 01 Plan 02: PostgreSQL and Migrations Summary

**Quill PostgreSQL context with compile-time SQL validation, Flyway migration service, and /ready endpoint verifying database connectivity**

## Performance

- **Duration:** 35 min
- **Started:** 2026-02-04T20:46:37Z
- **Completed:** 2026-02-04T21:21:13Z
- **Tasks:** 3
- **Files modified:** 7

## Accomplishments
- Quill PostgreSQL context with HikariCP connection pooling and SnakeCase naming
- Flyway migrator service exposing migrate/status as ZIO effects
- V1 migration creating summer_users table with proper schema (id, email, password_hash, timestamps)
- /ready endpoint returning 200 when database connected, 503 when not

## Task Commits

Each task was committed atomically:

1. **Task 1: Create Quill PostgreSQL context** - `106e664` (feat)
2. **Task 2: Create Flyway migrator service** - `ddb1964` (feat)
3. **Task 3: Add /ready endpoint with database check** - `0059add` (feat)

## Files Created/Modified
- `summercms/src/db/QuillContext.scala` - Quill PostgreSQL context with dataSourceLayer and quillLayer
- `summercms/src/db/Migrator.scala` - Flyway wrapper trait with migrate/status ZIO effects
- `summercms/resources/db/migration/V1__create_summer_users.sql` - Initial schema with summer_users table
- `summercms/resources/application.conf` - Added hikari prefix for HikariCP configuration
- `summercms/src/api/HealthRoutes.scala` - Added /ready endpoint with database connectivity check
- `summercms/src/api/Routes.scala` - Updated type to Routes[DataSource, Response]
- `summercms/src/Main.scala` - Provides dataSourceLayer to server

## Decisions Made
- **Separate config prefixes:** Used "hikari" prefix for HikariCP/Quill config separate from "database" prefix for ZIO config. The "database" key in ZIO config would conflict with HikariCP property parsing.
- **No auto-migration:** Migrations are NOT auto-run on startup per CONTEXT.md. Migrator service is available but must be explicitly invoked via CLI (Phase 5).
- **summer_migrations table:** Custom Flyway table name to distinguish from potential multi-tenant scenarios.

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Config prefix conflict resolution**
- **Found during:** Task 3 (Testing server startup)
- **Issue:** HikariCP was failing to initialize because it saw the "database" property from ZIO config and tried to set it as a HikariConfig property
- **Fix:** Changed Quill DataSource to read from "hikari" prefix instead of "database" prefix
- **Files modified:** QuillContext.scala, application.conf
- **Verification:** Server starts, /ready returns 200
- **Committed in:** 0059add (Task 3 commit)

**2. [Rule 3 - Blocking] Created database user and database**
- **Found during:** Task 3 (Testing server startup)
- **Issue:** PostgreSQL user "summercms" and database "summercms" did not exist
- **Fix:** Created user and database via psql
- **Files modified:** None (database-level change)
- **Verification:** Server connects, /ready returns 200

---

**Total deviations:** 2 auto-fixed (2 blocking)
**Impact on plan:** Both auto-fixes necessary for basic operation. No scope creep.

## Issues Encountered
- SLF4J binding warning during startup ("Failed to load class org.slf4j.impl.StaticLoggerBinder") - cosmetic only, not a functional issue. Can add slf4j-simple dependency in future if logging is needed.

## User Setup Required

**Database setup required.** If PostgreSQL user/database don't exist:

```bash
# Create database user and database
sudo -u postgres psql -c "CREATE USER summercms WITH PASSWORD 'summercms';"
sudo -u postgres psql -c "CREATE DATABASE summercms OWNER summercms;"
```

Or override via environment variables:
- `DB_HOST` - Database host (default: localhost)
- `DB_PORT` - Database port (default: 5432)
- `DB_NAME` - Database name (default: summercms)
- `DB_USER` - Database user (default: summercms)
- `DB_PASSWORD` - Database password (default: summercms)

## Next Phase Readiness
- Database layer complete with compile-time SQL validation via Quill
- Migration service ready for CLI integration (Phase 5)
- /ready endpoint available for deployment health checks
- Ready for Phase 2 (Plugin System) or Phase 3 (User Auth)

---
*Phase: 01-foundation*
*Completed: 2026-02-04*
