BARF got in trouble by some SEMRush bots..(they said that is not a bad bot but acting like one). So a robots.txt file to catch things like bingbot and such was put in.
It was basically bringing the forum down by trying to index every thread, every image, etc. (Oh yeah, pinterestbot was in there to, which is weird). I wound up adding an entry for the IP block it was coming from (185.191.171.0/24) to the /usr/ocal/etc/nginx/blockchina.conf file (added at the top), that is forcing it to get 403 errors, but has dropped DB load to the floor.