TV lineup changes are one of the downsides of a non-TiVo DVR. I have always found TiVo soooo good at updating channel lineups. I haven't been so lucky with SageTV. So rather than deal with a missed recording, I wrote a script to download the latest TV lineup from our cable provider and compare it to the previous day's lineup. If there are any differences, it will fire off an email to me with the changes. That way I know when I have to rescan the lineup for the HDHomeruns and SageTV if SageTV hasn't already done the right thing.
I'd love to publish it, but it's one of those things that I'm afraid could get blocked if too many people are using it and that would backfire on me. I do my best to disguise the user-agent and randomize the time of day the script runs to make it seem less bot-like.
In any case, it took all of 10 minutes to code up in Perl, so maybe this will inspire others to write their own should they feel the need.