Python FastAPI Endpoint with Pydantic Models

Create a FastAPI endpoint for [feature]. Requirements:
- Define Pydantic v2 models for request body and response
- Use async def for the route handler
- Implement proper dependency injection for database session
- Add path, query, and body parameter validation
- Include OpenAPI documentation (summary, description, response_model)
- Handle exceptions with HTTPException and proper status codes
- Add authentication dependency if this is a protected route
- Use repository pattern: route -> service -> repository
- Type all function parameters and return values
- Add logging with structlog or standard logging
- Include docstrings explaining business logic
- Write corresponding pytest tests with fixtures