Will try to keep that one short.

So we have internal system for active QR codes, nothing really special, as you could imagine. I wrote it when I was beginner but it works and is heavly battle-tested.

Today JBOG (just bunch of guys) come in and try to BS me that something is showing up wrongly for someone.

I check things up, nothing looks out of the order, I go there, everything looks fine too, and they say that yeah but this printed certificate's QR dosen't match what some QR with this name is within the system...

Short invastigation. TL;DR, someone who was rendering/printing these certificates had bunch of these codes with names like

30. ABC
31. ABC
32. ABC

And just casually missclicked...

And to come to that conclusion they need fucking backend dev to confirm that code last 1.5 year didnt magically change, and to destroy their magical belief that it's code's fault.

No, someone fucking missclicked. Whole magic. Usually problem is between chair and keyboard, get fucking used to it. Now, having that settled, let me get back to my work.