Tvheadend

My solution is:
1. Show all services on one page
2. Sort by colon
3. Select first and shift+click last then delete
4. After that remove mapped services with empty parameters

As i noted in the start of the topic " if the list is expanded to "show all" the list is to large to be displayed."

The problem is that the browser/TVheadend is not able to show the complete list if the entrys list is large, in this case 32000 entrys is WAAAAY to large.

your solution can work up to around 6-8000 service entrys.

Maby more correct solution is services list to be compared before and after scan,
and missing services automatically to be removed and unmapped.

To be more precise auto remove after 3 days (to skip operator problem with transmission) if not seen.

p.s.
Isn't "last seen time" colon help in your problem,
week ago (if scan each 24h) is too many time to keep empty service in list.