I'm not exactly clear if this is supposed to do what I was looking for.
I have a bunch of old posts with images attached to them, but they don't have a WP Featured image set. I'm looking for something to scan those old posts and permanently set the featured image based on whatever the first image in the post is.
I'm not looking for something like get_the_image that runs in realtime within the loop to grab photos. I want run once and then uninstall.
Anyway, I thought this did that, maybe not?