> country_code 01K3Y07Z94DGJWVMB0JG4YSDBV

A 7th normal form should mandate that no identifiers should ever be assigned to identifiers.

Not sure about that. Some folks would argue you should always use surrogate keys.

I probably wouldn't for country_code specifically, but for most things its useful even when you have a 'natural' key.

	▲	rixed 5 days ago \| parent [-]
		It can be useful in some cases but can also be a hindrance. First because identifiers are more useful when they allow to actualy identify the thing; and also because now they can change from instance to instance, from customer to customer etc...