The transience and non-indexability is a feature, it’s easier to manage a community if any problem can be solved by just ignoring it for a few days. Just have to hope the issue stays within Discord, sure you could search within discord, but no one is going to and on any large discord the results are likely to be so numerous that it’s worthless. Worst case you lock down a chat channel, mark it as private due to ‘spam’ and create a new one to serve the same purpose as the old to cover it up the rest of the way.