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Hi Kolenka,
Because the "_id" field in the "books" table is different between the two versions of the database, and also the sequence of the books is different, it looks as though the T1 has removed the books out of the "books" table and then added them back in. Which would explain why there are no matches between the Collections and Books. But why the T1 is doing this I have no idea.
You can also see that the "collection" table is the same in both DB versions but that the "collections" table in the second version is empty.
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