yes, that. The extreme case (that I had and is the one where I was finally convinced that uuid's save me from myself) was setting admin permissions on a user.

yes, that. The extreme case (that I had and is the one where I was finally convinced that uuid's save me from myself) was setting admin permissions on a user. I accidentally copy/pasted their account_id instead of their user_id. If I had been using integers I would have given admin permissions to a random user and never been aware of it. But because I was using uuid's I got a nice, safe "updated 0 records" response and knew there was a problem.