How to know when EPG lineup data updates

I submitted my missing lineup using the stickied form. And now I’m using a postal code from a nearby city that has a few more of the missing channels.

Now what? Is there any way to know when my postal code is added, other than deleting the DVR and re-adding it every few days or weeks? Does Gracenote or Plex have a page where you can look up the data for your area?