(SOLVED)"NO DATA" on many channel listings in mythweb, but not frontend

[yawlhoo]

mythweb is useful as a kind of swiss army knife tool to view status, what's recording, what's been recorded or will be, etc.

Recently I've been finding that its program schedule listings have "NO DATA" for many channels. Yet the frontend's program guide happily shows listings for those same channels.

Presumably the mythweb listings are the result of a php query of the listing database, but how to troubleshoot it?

[yawlhoo]

It seems that my system is simply mis-configured. But, I have been around and around and around in the MythTV guide "XMLTV":

https://www.mythtv.org/wiki/XMLTV

to no effect.

It says:

"I recommend that you ... make sure there are no recordings scheduled for the near future before starting."

Indeed. Because you are going to be at this for a while!

[yawlhoo]

I believe I have found the problem. It is disturbing that it involves such a tiny change, which leads to such profound effects.

In my Antenna.xmltv file, the correct first line is:

database=/home/mythtv/.xmltv/SchedulesDirect.DB

but my misconfigured Antenna.xmltv had the user directory:

database=/home/user/.xmltv/SchedulesDirect.DB

that leads to a LOT of problems.

I realize that mythtv configuration is supposed to be done as user mythtv, not as the ordinary user.

However, this is difficult for me, as I need to ssh to my backend, setting X forwarding, to access mythtv-setup. This works as user, but not as user mythtv. So there is a built-in booby trap, a problem for this booby.