Well, i did it.
I wrote the darn lua script.
And, depressingly, I did almost precisely nothing to help:
If you don’t notice the difference, it’s because there really isn’t that much here: we went from 17875 to 17172 unrated images, only about 700 images, or 4% of the work, were processed.
Ugh.
Anyways, perhaps this could be useful for others, so i published it here: new plugin: harmonize group ratings by anarcat · Pull Request #574 · darktable-org/lua-scripts · GitHub
review and feedback welcome.