Yes, the shelves is probably safer. It also has the advantage that you can still look at images that you don't want to use as the screensaver.
If you do it via the content table, it needs to be on update of the contentType=6 row for the image. The contentType=9 is created when the image is processed into the database and not change later. For some of the other book types, these rows get changed as the book is read.
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