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 @app.on_event('startup...
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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 that need to be inj...
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 blocking the response. I ne...
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 settings with valid...
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 get back the genera...
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 to understand which ...
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