If there is already a user, we compare the login and email to see if it is the same user.

CreateUser creates a new user along with the associated account, provider, and session.

DeleteSession deletes the session from the database.

GetDBUserSession gets the user session from the database based on the access token and browser info.

InspectInMemoryDB inspects the in-memory database.

UserInfo holds the essential information for a Github user.