feat: add PostgreSQL persistence for permanent shareable links

- Add PostgreSQL service to docker-compose with health checks
- Add migrate service that runs prisma migrate deploy on startup
- Integrate Prisma client in worker: checks for existing generations
  (same repo+commit) before regenerating, writes to Postgres on completion
- Update /api/docs/[id] with Redis → PostgreSQL fallback + cache repopulation
- Update Dockerfile: prisma generate in build, copy Prisma engine to worker/web
- Add @codeboard/database dependency to web and worker packages
- Add initial SQL migration for Generation and User tables
- Change removeOnComplete to { age: 3600 } for job retention

docker-compose.yml

@@ -7,9 +7,14 @@ services:
       - "4100:3000"
     environment:
       - REDIS_URL=redis://redis:6379
+      - DATABASE_URL=postgresql://codeboard:codeboard@postgres:5432/codeboard
     depends_on:
       redis:
         condition: service_started
+      postgres:
+        condition: service_healthy
+      migrate:
+        condition: service_completed_successfully
     restart: always
 
   worker:
@@ -18,6 +23,7 @@ services:
       target: worker
     environment:
       - REDIS_URL=redis://redis:6379
+      - DATABASE_URL=postgresql://codeboard:codeboard@postgres:5432/codeboard
       - OPENAI_API_KEY=${OPENAI_API_KEY:-}
       - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY:-}
       - LLM_MODEL=${LLM_MODEL:-kimi-k2-turbo-preview}
@@ -25,8 +31,39 @@ services:
     depends_on:
       redis:
         condition: service_started
+      postgres:
+        condition: service_healthy
+      migrate:
+        condition: service_completed_successfully
     restart: always
 
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      - POSTGRES_USER=codeboard
+      - POSTGRES_PASSWORD=codeboard
+      - POSTGRES_DB=codeboard
+    volumes:
+      - codeboard_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U codeboard"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: always
+
+  migrate:
+    build:
+      context: .
+      target: builder
+    command: npx prisma migrate deploy --schema=packages/database/prisma/schema.prisma
+    environment:
+      - DATABASE_URL=postgresql://codeboard:codeboard@postgres:5432/codeboard
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: "no"
+
   redis:
     image: redis:7-alpine
     volumes:
@@ -34,4 +71,5 @@ services:
     restart: always
 
 volumes:
+  codeboard_postgres_data:
   codeboard_redis_data: