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Does your User class need to be a Doctrine entity?
User
Technically no, but you'll need to create your own authenticator system to support a non-entity User class.
No: you're free to make your User class a Doctrine entity or not.
Yes. But it's no problem: if you load users data from somewhere else (e.g. an API), just store a local "cache" of that data in your local database.
