It also probably left traces in the mysql(postgres?) logs. It shouldn't surprise anyone on HN that you can freely edit your own data. More generally it's very

It also probably left traces in the mysql(postgres?) logs. It shouldn't surprise anyone on HN that you can freely edit your own data. More generally it's very common for forums to have a post edited by mods/admin, usually the edit will show up but if you mess with them they may be tempted to hit back and forget to set the "changed by xxxx" flag.