Clean up old results by cron job
CollecTor is archiving the results daily. It's a good idea to keep a few days cache around to cope with outages but this is silly. https://check.torproject.org/lists/
A one-liner we could stick in a cron job to delete files older than X days would be a great addition here.
(I guess if you were doing it properly you'd put it in the Python wrapper script.)