How to set up a Postgres database on a Raspberry Pi: 
Databases are a great way to add data persistence to your project or application. You can write data in one session and it’ll be there the next time you want to look. A well-designed database can be efficient at looking up data in large datasets, and you won’t have to worry about how it looks, just what you want it to find. It’s fairly simple to set up a database for basic CRUD (create, record, update, delete) applications, which is a common pattern, and it is useful in many projects.
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