I track books bought (date, shop, price) and books read, in calibre and in this year's challenge thread. But the only metadata I track books by is author/title.
I don't feel any need to track diversity of the books, characters, or authors.
I do wish I'd started tracking my books read earlier though. If only to know when I'm re-reading something. (It's sometimes hard to identify at the start of a book whether I've read it before - especially if it's something I read ten years ago or more. At my reading rate that's 1500+ books ago!)
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