UBB.threads PHP Forum Software Community Forums UBB.threads Version 7/8 Support PM Limit Issue

Resurrecting old thread with related question:

I want to keep private messages low ( it IS a public forum ), so I have set the limit to 20. Some user's are at their limit. In what table is the count of messages received kept?

I am thinking of running a query occasionally, and publicly notifying those close to the limit.

I am currently running Threads 7.1

Thanks!