I agree, this is the way to do it. Anything originating from the outside is bound to change, being email address, social security numbers, ... The post also

I agree, this is the way to do it. Anything originating from the outside is bound to change, being email address, social security numbers, ... The post also completely ignores foreign keys. It is an absolute advantage to size and speed to have foreign keys to be int4/int8 and not an email address or UUID.