Production-ready FastAPI patterns with Pydantic v2, SQLAlchemy 2.0 async, and JWT authentication.

• Domain-based project structure, async database setup with SQLAlchemy 2.0, and dependency injection patterns for maintainable APIs
• Comprehensive JWT authentication with password hashing, token generation, and protected routes using OAuth2
• Prevents 7 documented issues including form data validation bugs, background task overwrites, Pydantic v2 migration breaking changes, and async event loop blocking
• Built-in guidance on CORS configuration, error handling, testing with AsyncClient, and deployment via Uvicorn or Gunicorn