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A valid Calibre Library has a Metadata.db file in its top level folder (the folder is the library name).
AFAIK that is all that is required to keep that message at bay. (all the books could still be MIA)
This is what SHOWS (lists) your books in the GUI as well as points to the file to perform any actions you call for
This Must Match the Library (version in time) with the Author / title folders
(the reason we advise folk to NOT mess beneath the skirts. one tiny change, breaks the linkages)
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