Wouldn't you have a lot more issues than just ids ? It very improbable that folding 1:1 would be even possible. You'll much more likely have to do a migration m

Wouldn't you have a lot more issues than just ids ? It very improbable that folding 1:1 would be even possible. You'll much more likely have to do a migration merging relevant information into a new table. So the question holds, when do you change a PK ?