Since the TechIMO glitch that messed with everyone's post counts, mine went from 3100 or so down into the 1000's.... So even though I have a custom title, I can't go in and change it anymore until I reach 3000 AGAIN. BUMMER!
I just noticed that you can google search for "your_nickname techimo" without the quotes, then click "cached" and it should pull up a post you made fairly close to just before the database error. Might come in handy for those that have no idea what their # was
Admins have backups that'll tell 'em that. AFAIK, the idea is to run a script that looks at the current post count, compares it to the backup count, and adds posts made since the backup.
Getting the script exactly right would require a fair bit of fine-tuning, though.