Removing OS X Download History Revision as of Sunday, 20 December 2015 at 19:56 UTC
Some
background.
Here’s how you see the files:
~/Library/Preferences/com.apple.LaunchServices.QuarantineEvents* 'select LSQuarantineDataURLString from LSQuarantineEvent'
I have a crontab entry that removes the downloads every night.
* 0 * * * sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* 'delete from LSQuarantineEvent'