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@wolf480pl I know, right?

Sadly the only 1-byte type in core Postgres is a boolean, which is... not quite suitable. Using the FK approach with smallints still halves the storage requirements, but meh.

I'm almost considering hacking in support for 1-byte enums into Postgres. Even have an idea on how to do that within its current enum framework, but I doubt there's much enthusiasm among postgres devs to add the complexity unless I can motivate it with some strong use cases and benchmarks.