Replace databaseInterface with Django models

~~`databaseInterface` is still imported in a few places in MCPServer, primarily for the `getUTCTime` function that will be moved elsewhere, and for database locking that may be removeable.~~

See comments below.
Good thought. I get the idea this might have been intended to be generalized like some of the other scripts, with this passed at the CLI, but since that didn't happen / won't happen I'd rather take it out.