But if your schema changes, it means you have to do a migration to N databases (N being the number of customers you have). If you have to update your database f

But if your schema changes, it means you have to do a migration to N databases (N being the number of customers you have). If you have to update your database from PG 9.0 to PG 10.0, you have to do N times. And so on. You'll have N number of backups that all have to be stored individually. Etc etc.