Well, after having the occasion to try running the new Tatoeba in real conditions for a few hours, it turns out that it's really, really, really slow and ended up crashing the server... Not really the best time for it to happen. I guess I underestimated the consequences of caring too little about optimization.
Sorry for those who needed to search in the corpus, and those who tried to re-confirm their registration but couldn't because the server is down. I'll be more careful next time. Hopefully I can get everything fixed by the end of the weekend.