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A database is just an organized collection of information. You could have a database of your music or your books. But I’m going to talk about a database of all the people you know. Your email app is a kind of database. It has an address book of everyone you’ve emailed, and a history of your emails with each person. So you’ve already done half of what I’m going to describe here. But I’m going to recommend you go further than that, and also keep track of: your private notes about people (“serv...