For anyone curious, downtimes like this completely mess up auction safes. For example, when the servers went down, an item had 21 minutes remaining. When the servers came back up, the safes that previously read 21 minutes read 1 hour remaining. This "x hours remaining" is very ambiguous, as it can be any time from 1 hour 1 minute to 1 hour 59 minutes, so I figured I still had time as I understood it to be a revert, as actions that had taken place ~90 minutes before the servers going down were no longer completed. About 90 seconds after the server came back up, all the auction safes ended (if I had to guess, it was around 21 minutes in real time after the server went down), with their time remaining going from the aforementioned 1 hour, to auction closed/pending.
Pretty disappointed, honestly.