Hello,
I developed for my server a small Perlscript which accesses a MysSQL-DB and can create every dax Chatlogs of your public MUCs if there was any conversation. It just grabs everything from the db which was postet between yesterday midnight and now. So I let run every day at midnight. It creates alls subfolders and files itself according the schema /selectable_path/roomname/year/month/day.html. The files are styled by css file which you have to create (or generate). Is anyone interested in this script? If so I will post it here. A demo can be seen under https://im.goesberserk.de/chatlogs/public_mucs