@Trel - so, assuming you're accessing the metadata.db file via the SQLite API I don't understand your problem. From the db you can access the book folders (you already know that) and read the cover.jpg files - you don't have to expose the other files.
You seem to be asking if anyone has done what you've already half-done. Have you looked in the Related Tools subforum - there's a 'useful threads' sticky at the top.
BR
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