FastAPI Patterns Problem Statement FastAPI API design directly affects frontend. Bad patterns here cause frontend bugs, poor developer experience, and integration issues. The OpenAPI schema drives frontend code generation. --- Pattern: Dependency Injection Problem: Repetitive code for auth, sessions, and services. Dependency chain: → → --- Pattern: Response Models Problem: Inconsistent responses, exposing internal fields, poor OpenAPI docs. Why response model matters: 1. Filters output to only specified fields 2. Generates accurate OpenAPI schema 3. Frontend Orval codegen depends on this ---…