Since upgrading PPM there is a job named "Purge CSV Downloads" in the system. There is no documentation on the job parameters or conditions in which this job runs. The job cannot be run off the PPM jobs menu but available in the the job tables.
Administration > Security and Diagnostics > Job Details Lists the job as following:
Job visible from the PPM job tables- cmn_sch_jobs and cmn_sch_job_definitions:
Clarity PPM 15.8.1 and supported releases.
The PURGE_CSV_DOWNLOADS is a system job and the functionality meant to be delivered is to support the PPM new UX pages that provides the export to CSV export functionalities. The logic is that any time a users exports from the PPM new UX page the job would be triggered which will copy the CSV files temporarily to the PPM filestore and the CSV download is initiated for the user requesting it.
The job parameters is hardcoded for 7 days. So any CSV older than 7 days will be automatically deleted.
In summary a PPM admin would not need to manually run or schedule the job, this system job is coded to run automatically and by design the job is hidden of the UI and there is no feature limitation on the PPM UI.