But... why have 2 databases? It just causes more management headaches, especially if you want to share books. Keep one database and use tags to manage which books each of you want. That way you can easily share books by both having your tags on the same books. For example, you want him to read the book you just finished. You can just add his tag to the book and when he searches on his tags, he'll see it. That's what the tags are for.
Multiple databases just add clutter and extra management. Also, I don't think you can have a single db file with multiple locations simultaneously.
Tags are really the best way to go.
My $0.02
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