Fastapi Async Patterns

This one covers the patterns you need for async FastAPI, from basic route handlers to WebSocket connections. It shows you when to use async versus sync endpoints (IO-bound versus CPU-bound), how to wire up async database operations with SQLAlchemy, asyncpg, and Motor, and how to handle background tasks without blocking responses. The WebSocket section includes a connection manager for broadcasting, which is what you'll need for chat apps or live dashboards. Honestly, the value here is having working examples of the dependency injection patterns and session management rather than hunting through docs. If you're moving from sync Flask or building something that needs to handle thousands of concurrent connections, this gives you the patterns to do it right.