OK, I ran your line in the "Run SQL query/queries on database" window and got ten results. If that's it, not bad for a database of 518 active ads. Must be the ads are being dumped automatically (after 3 days) as planned.
May I suggest a few extra utility reports in the Admin page of your next beta release. That would be far less intimidating than dealing with PhpMyadmin Nerdvision. (I'm always afraid that I can screw something up in there.) Googling keywords (mysql query select tutorial) brings back a plethora of ad laden pages that have gone into keyword overload and say nothing. It's a jungle out there!
I'll keep studying.