Our in-house schema migration tool supports downgrading, but it won't remove non-empty tables or columns etc. For us this isn't a big deal though because we're

Our in-house schema migration tool supports downgrading, but it won't remove non-empty tables or columns etc. For us this isn't a big deal though because we're writing our software so it should be able to function as expected on a DB with a newer schema. This makes upgrades much easier to handle has users can run new and old software side-by-side.