All rebuilt , The library Mtce , check library came back as all ok however I used restore DB after reinstalling Calibre and bingo 80% odd ISBN Data was fixed, Then I ran the extract ISBN Plugin and it filled in most of the missing details. A small number is left 2% however they are from older authors so I can live with that. Now to add 2 columns To be read and Read. I suspect that the Calibre app was corrupted and reinstalling it helped. I didn't do a clean reinstall which worried me .
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