Ok, I copied the entire content of my internal sd card before deleting a book (with Kobo, not with Calibre), and then I checked for differences.
It *seems* that the db does not change in any useful table (the only affected table is the one that stores analytic data). This is quite surprising. It *seems* that the only difference is that not only the book, but also book cover images are removed from the device.
Calibre seems to remove cover images as well, since they are no more displayed in tiles. Do you know if it removes the subfolder that contains the images? Kobo does not remove the subfolders.
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