- Add owner_id check in repository delete operation
- Fix time range validation for partial updates
- Wrap pre-query in try/except for consistent error handling
- Use default_factory instead of mutable defaults
- Add max_length constraint for timezone field
- Remove unused dependencies and empty validators
- Extract magic numbers to constants
- Simplify update logic with model_dump
- Add ScheduleItem Pydantic schemas with metadata support
- Add repository layer with CRUD operations
- Add service layer with authorization
- Add FastAPI router with all endpoints
- Add unit and integration tests
- Update API documentation
qzl