fix: nginx dns re-resolve, db healthcheck, explicit bind

docker-compose.yml

@@ -13,14 +13,21 @@ services:
     volumes:
       - postgres_data:/var/lib/postgresql/data
     restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres} -d ${POSTGRES_DB:-goldbank}"]
+      interval: 5s
+      timeout: 5s
+      retries: 12
 
   api:
     build:
       context: ./apps/api
       dockerfile: Dockerfile
     container_name: goldbank_api
+    # Prisma connects on module init, so a not-yet-ready DB crash-loops the API.
     depends_on:
-      - db
+      db:
+        condition: service_healthy
     environment:
       - DATABASE_URL=${DATABASE_URL:-postgresql://postgres:postgres@db:5432/goldbank?schema=public}
       - PORT=${PORT:-3000}