Regularly update the DB whether you think you need it or not. At the same time, check the RR Frequency DB for yellow or green colors in areas that you have affiliated FL data. The best way I know to keep up with changes that affect you.
There was a thread on here a while back (But do you think I can find it now? NNOOOO....) started by a user who developed a program called "Favorites List Helper", which, IIRC, would look for differences between your updated database & your favorites lists, but would overlook changes you made in the description field. (A lot of users, like myself, edit the text in those boxes.) So if a new frequency or talkgroup popped up which was not in any of your favorites lists, it would flag it.