Dude, we've all been there. You are neither the first nor the last. It's never a single person. One day the technical side of our little startup collectively went to a conference (back then it was only two engineers plus a technical leader) while our server DoS'd itself by broken mail processing... we had a rough night in a Belgium hotel figuring out who attacked the site to realize it was ourselves. The 10k block of missing image IDs always stood as a reference not to leave even a low traffic site unmonitored. It happens.