By default we reuse the same database file as the openidp side of things.
This will not cause any issues, and is just to get as few databases as possible.

It looks fine to me, so :+1: here. But, it would probably benefit from someone more familiar with the protocol having a look at it.

Maybe you could provide an example of what could be an external OpenID providers?

twice the nickname?

(For the record: Simo had some suggestions that would require reworking this PR. I just rebased it for now, and will be looking at fixing those later).

I have not yet had time to fix the requests from Simo. I will look at fixing those sometime in the future, and reopen this when I do.