I unknowingly reset serial number counters in a bicycle part's database, so now there are a few hundred people in the world with high end bike hubs that overlap

I unknowingly reset serial number counters in a bicycle part's database, so now there are a few hundred people in the world with high end bike hubs that overlap each other. Lesson: Keep the code that touches production databases as simple as possible so it's easy to verify exactly what it does. I was using a framework's database tooling incorrectly because I never dreamed what I used would touch the databases's counters. (Not my worst mistake in terms of people affected, but it's the only mistake that was literally laser etched in metal forever.)