Remove jobs_directory folder and Local data in server

Hi all,

Firsttly, I am curious about storage of tmp or cached file in jobs_directory, now i am setting galaxy.yml with cleanup_job=onsuccess, so look like Galaxy server just delete tmp files when they got successful jobs. That why I have a lot of big tmp file from failed job (as you can see from picture). So I wonder is it safe to delete contents in jobs_directory folder for cleaning my server storage? And of course after that, I will change setting to “always” in cleanup_job policy.

Secondly, I also curious about how to delete database file in “Local data” of Server section in Admin panel. As you can see this table does not have any function button to manage data file. Or I have to do it manually.

Thanks a lot,
Huy Quang Pham.