I have no idea how this would work in the UI, but now that I have custom charts based on my tags (🎉🎉🎉🎉🎉🎉), I want to make sure those charts stay up to date.

One of the charts I just made was "Book Source" where I have tags for "from-libby", "from-store", etc feeding the chart. I would love some kind of notification when I mark a book as Finished of "hey wait! you forgot to set a tag from this set of tags on this book!" A bonus would be some kind of view of "all books marked as Read that do not have one tag in this set" so I could go through and update any I missed all at once.

Being the data nerd that I am, I do try to go and check periodically to make sure that I have one of these tags on every book, but it would be cool if there was an automated way to enforce it.