GitLab

This fixes an issue with RAG that stops loading documents as soon
as it reaches a file with unsupported mimetype.

Endpoint role-checking was redundantly applied but FastAPI provides a nice abstraction mechanic...so I applied it. There should be no logical changes in this code; only simpler, cleaner ways for doing the same thing.

admin only

Even though "User.email" is enforced as unique at signup, it is not a unique field in the database. Let's use "User.id" instead. This also makes it more difficult to do a session stealing attack.