Like the feature flag approach for all feature rollout(with or without schema change). If the flag is set the new feature kicks in so its easy to do a rollback

Like the feature flag approach for all feature rollout(with or without schema change). If the flag is set the new feature kicks in so its easy to do a rollback if need be and we do this all the time. We don't close the feature ticket until the flag(old schema too) is removed and made as default in production after the smooth transition.