I've been running Channels for quite some time & never looked into that "Manage Recordings Database" section before, so the 211 dates back at least 5 years.
I deleted out the missing/deleted and delayed tabs individually (that came in @ 679 recordings), so i think the trash all is only the current selected tab.
i'm going to work through the corrupted files individually (by show) as i want to make sure that anything i delete is set to re-record.
Time shifting is really my way of consuming television - i typically binge on whole series at once. Before Channels, it was SageTV - peruse the new shows coming on, then set a season pass. Watch if/when i have time, but long after the commercials have been marked.