This evening, our current hoster did a great job by fixing the Coccinella website in about 30 minutes. It came out there were a few MySQL errors caused by Drupal's cache...only 200GB of errors! :-D Luckily, Florian is a nice hoster; our previous cheap hosting service provider would surely had suspended our account.
Speaking of cheap hosting, we still didn't received - after multiple requests - our invoice that had to be send in August 2008...Florian, please remind this "issue"! ;-)