We have run a lot of db changes. It requires multiple steps. Add a column, migrate data, update code to use new column and old column, update code to use only t

We have run a lot of db changes. It requires multiple steps. Add a column, migrate data, update code to use new column and old column, update code to use only the new column, update table to drop old column. Similar for migrating to new dbs, tables, etc. It is rare for us to need to disable writes for a version bump or something.