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Not quite database but close enough: Apple's "Time Machine" backup is kind of like a database of all files you ever held. It has the ability to completely erase a file with all versions held, as if it had never existed - very useful to permanently erase sensitive data, or data that was illegal to own in the first place, so you don't want to have any copies ...


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Centralize the Side Effects The difficulty of reasoning about the correctness of event-driven systems for me, and of eventually running into that "series of unfortunate events", is the level of decentralization of code resulting from it combined with side effects. Ideally the code executed when an event triggered has hardly any risk of ever doing something ...



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