Migrations become destructive when renaming multiple enums

[tmrkus]

If you rename enum A -> A' and then B -> A, database migrations become destructive. Both enums and columns using it are dropped and then recreated .

When you just rename A -> A', run the migrations, and then rename B -> A, everything works as expected.

[zapov]

This is unlikely to change until some specialized migration language is introduced. It doesn't seems like a big problem to have refactoring done in multiple steps :(