> you use it when you need to generate unique keys in a distributed manner

Just to complement this with a point, but there isn't any mainstream database management system out there that is distributed on the sense that it requires UUIDs to generate its internal keys.

There exist some you can find on the internet, and some institutions have internal systems that behave this way. But as a near universal rule, the thing people know as a "database" isn't distributed on this sense, and if the column creation is done inside the database, you don't need them.