> Every single time I've seen a primary key being defined with a natural key, it turned out that this set of attributes wasn't as immutable as we thought actual

> Every single time I've seen a primary key being defined with a natural key, it turned out that this set of attributes wasn't as immutable as we thought actually and it caused a world of pain. Yep, happens to the best of us. Never mess around with this, just use a bigserial.