Since the last update, I expanded the backend schema beyond authentication and started modeling the learning content structure of NihonGo. I added the core Sequelize models for course modules, lessons, exercises, and exercise options, along with the relationships between them so the content can be loaded in a structured way.

The project now supports a full content hierarchy: modules contain lessons, lessons contain exercises, and exercises can contain multiple answer options. I also kept the user model in place for authentication, with roles already prepared for future access control.

On the database side, I created and ran the migrations needed to make these tables available in PostgreSQL. The schema is now in a usable state for starting content seeding and API endpoints for lessons and exercises.