Is "nova-manage db online_data_migrations" cumulative across versions?

Hi, We realized that after a Stein -> Train upgrade of our cloud, we forgot to run "nova-manage db online_data_migrations" and did the Train -> Ussuri upgrade. We have not seen any bad side effect but where wondering if the online_data_migrations was cumulative across versions and if running it under Ussuri fixed potential changes related to Stein -> Train upgrade that we forgot to fix right after the Train upgrade. If not, are there things to do to cleanup the situation? Cheers, Michel