Python Backend

This is a solid reference for FastAPI projects that covers the stuff you actually need in production. It handles async SQLAlchemy patterns, JWT and OAuth2 auth flows, and Upstash integrations for Redis caching and QStash background jobs. The rate limiting implementation uses sliding windows, which is the right approach. What makes this useful is the focus on refactoring AI-generated Python code, since that's often where backend patterns fall apart. If you're building APIs with FastAPI and want to avoid reinventing authentication, database transactions, or caching patterns, this gives you working examples. It assumes you know Python but need the glue code between FastAPI, SQLAlchemy, and modern tooling.