@pttr1 Indeed.  And if we have unique IDs, we avoid that.  There's also many other positives.  For example, if we have ids for notices we know are unique, then if we have a conversation we're missing notices from we can request the specific notice ids we're missing.  We can't really do this (easily) now because they're not unique.  So if your server doesn't federate with the server a missing notice in the conversation came from, you have no idea what ids to ask for from it.