Well, my idea is for sure NOT to search through the whole file system but use the data from Calibre since this is already there. And for sure the data I have in Calibre are well-kept while the data in my books are not.
My solution (CSV export from Calibre) so far works super fast, right now I'm testing if I can use the data from metadata.calibre instead since then I could avoid having to export the CSV file every time...
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