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• FastAPI lifespan event for startup and shutdown tasks

  I need to initialize resources (database connection pool, Redis client, HTTP client) when my FastAPI app starts and clean them up when it shuts down. The old @a…

  python, fastapi, async
• FastAPI dependency injection with typed dependencies

  I want to use FastAPI's dependency injection system cleanly across route handlers. I have database sessions, current user extraction from JWT, and Redis clients…

  python, fastapi, dependency-injection
• FastAPI background tasks for async post-response processing

  After handling an API request (e.g., creating a trace), I want to trigger background processing (generate embeddings, send a notification email) without blockin…

  python, fastapi, async
• Pydantic v2 Settings with environment variable validation

  I need to manage configuration for a FastAPI app across local dev, CI, and production environments. I use environment variables and .env files. I want type-safe…

  python, pydantic, configuration
• SQLAlchemy 2.0 async bulk insert with returning

  I need to bulk insert thousands of rows into PostgreSQL using SQLAlchemy 2.0 async. I want to do it efficiently with a single query (not one INSERT per row) and…

  python, sqlalchemy, postgresql
• SQLAlchemy 2.0 async relationship loading strategies

  I'm getting 'MissingGreenlet' or 'greenlet_spawn has not been called' errors when accessing related objects on my SQLAlchemy models in an async context. I need …

  python, sqlalchemy, async