decomposer: generate deliverable files for Implement the task REST API service with FastAPI, including standard CRUD endpoints, HTTP status semantics, request and response models, and structured error handling.; Add a PostgreSQL persistence layer for the task service using SQLAlchemy models, session management, database initialization or migrations, and durable task storage integrated with the existing API contract.; Define and integrate Pydantic request and response schemas for task fields, status values, identifiers, timestamps, and validation errors across the existing FastAPI service and persistence contract.; Add automated pytest coverage for the task API, including CRUD behavior, request and response validation failures, HTTP status semantics, and persistence interactions using isolated test data.; Containerize the FastAPI task service and PostgreSQL persistence service with Docker Compose, including environment-based configuration, health checks, networking, startup dependencies, and persistent database storage.; Create project documentation and operational guidance covering local setup, Docker Compose configuration, environment variables, API endpoints, validation and error responses, testing commands, persistence behavior, and relevant best-practice notes.

docker-compose.yml

@@ -0,0 +1,37 @@
+services:
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-tasks}
+      POSTGRES_USER: ${POSTGRES_USER:-tasks}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-tasks}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    networks: [tasks_net]
+  api:
+    build: .
+    environment:
+      DATABASE_URL: ${DATABASE_URL:-postgresql+psycopg2://tasks:tasks@db:5432/tasks}
+      APP_NAME: ${APP_NAME:-Task API}
+      LOG_LEVEL: ${LOG_LEVEL:-INFO}
+    ports:
+      - "${API_PORT:-8000}:8000"
+    depends_on:
+      db:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks: [tasks_net]
+volumes:
+  postgres_data:
+networks:
+  tasks_net:
+    driver: bridge