Ralf Haferkamp wrote: > I am currently trying to backport the fix for > https://launchpad.net/bugs/1254246 to stable/havana. The current state of that > is here: https://review.openstack.org/#/c/68929/ > > However, the fix requires a database migration to be applied (to add a unique > constraint to the agents table). And the current fix linked above will AFAIK > break havana->icehouse migrations. So I wonder what would be the correct way to > do backport database migrations in neutron using alembic? Is there even a > correct way, or are backports of database migrations a no go? FWIW our StableBranch policy[1] generally forbids DB schema changes in stable branches. [1] https://wiki.openstack.org/wiki/StableBranch -- Thierry Carrez (ttx)