Adopt orphaned Ubiquity UniFi devices
Ubiquity UniFi Cloud Key controllers are notorious for getting corrupted database after powering them off without clean shut down. Best course of action in such cases is to factory reset the Cloud Key and then restore from a backup up. If no backup is available you'll have to factory reset and reconfigure it from scratch. The main issue with this is that all UniFi WiFi Access Points and other devices that were previously managed by this controller will now be orphaned and appear in devices list as Manager By Other.