Yesterday, the authentication foundation was laid; custom user model, JWT endpoints, everything tested in Postman. Today was about completing the entire database layer before writing a single API view. Models, relationships, constraints, migrations, admin registration, and seeded test data. By the end of today, the database will be fully shaped and ready for the API to be built on top of it tomorrow. The Reason Behind Finishing Models First It's tempting to build features incrementally: write a model, write its serializer, write its views, wire up its URLs, then move to the next model. That approach feels productive because you get working endpoints faster. But it has a hidden cost: every time you go back and change a model to support a new feature, you run another migration, potentially break existing serializers, and create technical debt in the API layer. Finishing all models in one dedicated day means the database schema is stable before any API code is written.…