ok, just to say that I could find somewhere in an old directory called "consolidate all calibre libraries" a backup called ISDBN.json under another directory called plugins. I don't how it worked out but by indeed restoring the db with a few books and having tested it out positively it worked quite well. I did a full restore and Hoera ! everything is back.
so great help. thanks for it.
i don't have any clue about these plug ins which are I guess plug in I choose to put myself in Calibre although I don't know what this "consolidate" function is. but I am not very IT litterate to understand naturally all of that.
bye
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