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dwig - I have tried using the IDs column as you suggest, but because it operates at the book level I found it too much of a contrivance for my purposes. At the individual book level I prefer to use long text (header on the side) columns to hold the link.
Basically I would like the ability to click on an entity value (Publisher, Series, Location, Illustrator, AdminTag etc) in book details and go to its website, or a page in one of my OneNote or Evernote notebooks, or simply open a file; like I do for the Authors values in Book Details -- assuming I have the appropriate URI in the Manage Authors
Link column
But I suspect that would require an additional column (Link) to be added to all the relevant database tables, which is why I assume its a big ask. Kovid has avoided the need to change the database schema for a very long time (maybe never). I've been down the path of changing users' managed databases, there be dragons down there
But thanks for the suggestion. It may help someone else.
BR