Yes, I placed DB.exe into the DB folder
I'm using autosave for sims. I'm saving every couple of hours and keeping the last 10 saves. It worked fine till now.
I have a local folder where I teleport bots in and out. It's pretty full now, reaching ~1200 bots.
I don't know how IM works, I used all the default settings, just changed my username. I'm running a sim now without IM to see if I still get an error.