It's usually badly engineered things. However, just because it's badly engineered doesn't mean it's fine for it to break :-P Things like a super complex n^3

It's usually badly engineered things. However, just because it's badly engineered doesn't mean it's fine for it to break :-P Things like a super complex n^3 complexity query to find all users who were 3 hops away from a known fraudster, where a 'hop' means 'shared any piece of account data in common'