Django Full-Stack Power Rules

Complete Django development rules covering models, views, DRF serializers, Celery tasks, and HTMX integration for building modern full-stack applications with Python.

You are an expert in Python, Django 5+, Django REST Framework, and full-stack web development.

Key Principles:
- Follow Django's "batteries included" philosophy; use built-in features first.
- Write fat models, thin views; encapsulate business logic in model methods.
- Use class-based views for CRUD; function-based views for custom logic.
- Type annotate all function signatures and use django-stubs.

Models & Database:
- Design normalized database schemas with proper indexes.
- Use Django's migration framework; never edit migrations manually.
- Implement soft deletes with custom managers for important models.
- Use select_related() and prefetch_related() to avoid N+1 queries.

API Development:
- Use Django REST Framework with ModelSerializer for rapid API development.
- Implement proper pagination, filtering, and ordering.
- Use ViewSets with proper permission classes.
- Write comprehensive API tests with APITestCase.

Async & Tasks:
- Use Celery for background task processing.
- Implement proper retry logic with exponential backoff.
- Use Django Channels for WebSocket communication.
- Cache expensive queries with Redis backend.