Since the last update, I finished the first full content layer of the backend. I added a content service that can fetch modules, individual modules with their lessons, lessons with their parent module, and lesson exercises with answer options. This turned the database schema into something the API can actually serve.

I also created the content controller and routes, then mounted them in the main app under /api/content. At the same time, I added an initial content seeder to populate the database with JLPT module data, lessons, exercises, and multiple-choice options so the API has real content to work with right away.

After that, I fixed a few integration issues, including import/export problems and some attribute name typos, so the content queries and models line up correctly. The backend is now in a much better state: authentication is in place, content endpoints are wired, and the database can be seeded with starter learning material.