Self-Hosted
Tested. Deployed. Wrong Anyway.
147 tests, a proven arithmetic fix, a clean deployment. Then I actually used the thing for ten minutes and found four bugs the tests were structurally incapable of seeing.
The Server Was Never Down
A medication tracker I built for myself started refusing to connect, from every device, while the server sat there perfectly healthy the entire time. The bug was a ghost, and I built it myself months earlier without noticing.