For future reference I recommend having another Haiku instance monitor the chat and check if people are up to some shenanigans. You can use ntfy to send yourself an alert. The chat is completely off the rails right now...
There is probably a much simpler solution. Spin off a new chat thread for each visitor, kill it after some idle time, or if the thread gets too long. There is no reason to allow random people interact if the goal is to have only an "interactive resume"