This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job. You're in the dumb-mistakes-and-gotchas category.
Last Updated: 2024-04-25
Upon seeing that many of the columns of the advisors table in Project S were
not used in the web app I was tasked with building, I wrote a migration to
delete and rename these columns.
I later found out that an administrator freelancer had a backdoor for adding data, that made use of some of the columns I removed.