[Observium] Disable auto adding ports on Mikrotik PPPoE Server

Hi

I have two Mikrotik PPPoE Servers added to Observium and it constantly adding new ports as users get connected with PPPoE ports, and then deleted as user disconnects. After some time a lot of ports appear in Deleted Port, that I need to manually delete them, and also disk space grows as new rrd's gets created. I tried adding "bad_if" in config file but without success, because this interfaces don't have description. Also is there any way to permanently delete this previously added port from database and rrd folder.

Thanks,

Petar Janev