How does bb message deletion work?
When you delete a message on a bb, it’s flagged as deleted, but doesn’t actually go away for good. You can list deleted messages on a channel with bb undel #channel, and undelete a specific one with bb undel #channel = 3. You can only undelete messages you can delete — your own, or any if you’re channel pope. Each bb has a queue of deleted messages which is limited to some number (currently 5); when more messages are deleted than that, the oldest message is permanently purged. See help bb_delete and help bb_undelete for more.