Yes Uniden directly loads Sentinel from our DB every Sunday and has it ready on Monday. You can get another software, and a subscription to here, and do your own direct programming any time you like. I highly recommend ProScan though! Butel's ARC also works.
Sentinel is updated weekly by Uniden. Uniden's automated servers pull the database from Radio Reference late on Sunday evenings (barring occasional glitches), and format it for use by the database scanners, and it is available Monday through Sentinel.
You can not directly access the Radio Reference database through Sentinel. Proscan can access the RR database if you are a premium member of RR.