Unique constraint Memes

Ah, the classic primary key violation that no one warned the poor user about. Some developer thought storing age as a unique identifier was a brilliant idea, and now we've got 17-year-olds fighting in the Thunderdome for database supremacy. Next time try using UUID instead of, you know, THE MOST COMMON AGE AMONG TEENAGE USERS. This is what happens when you let the intern design your database schema after a Red Bull all-nighter.