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Coincidentally I received a used SQLite textbook from Amazon today with this database design tucked inside. https://pbs.twimg.com/media/BsigXtOCcAAIGJh.jpg

Discovering design notes in old textbooks is one of the joys of buying used books.

I'll make a note of better hiding my notes in textbooks I'm reselling so they aren't removed before reaching their new owner.

This is a delightful discovery. I wonder there exists a used book anthropology of sorts for these tidbits.

That's awesome! Thanks!