Tvheadend

I have activated the XMLTV feed for Schedules Direct, using https://github.com/kgroeneveld/tv_grab_sd_json/blob/master/tv_grab_sd_json
This works well, except some channels do not have data all the time. In that case, the EPG in tvheadend show

Title - To Be Announced
Description - Programming to be announced
Start time - on the hour
Duration - 8 hours

for many of the channels that I get from Schedules Direct, starting either 10 days or 14 days out. No problem so far.

However, when the next epg grab finds the up to date info, tvheadend determines that the time is already in the epgdb (with an 8 hour block of "To Be Announced") and does not update the info with more accurate (correct) schedules.

It would be great if the "to be announced" schedules were ignored or at least overwritten. Right now I resolve the issue by deleting the epgdb every week.

(epgdump fails to print the epgdb.v2)