Is there an automatic user deletion process active in this forum?

[Ernst Fueloep]

I have just now registered my user "Ernst Fueloep" again.
I was registered since dec 2013. But suddenly my user vanished from this forum.

Is there some automatic user deletion process active in this forum?
If the user doesn't post a message in a certain timeframe it gets deleted automatically?

Or can anybody answer why my user id vanished?

Thanks.