At previous job v.2, changed an IoT system that received daily text files from remote devices from dumping millions of them in the top level of the /data partition to using a /data/YYYY/MM/unit_id/ structure.

The claim was that the original files needed to be kept for audits, even after database ingest.

Management didn't care, but I made the change because I wanted to have my terminal not die if I accidentally typed "ls" in the wrong directory.