Migrating multiple connections simultaneously to one database

We have multiple production applications (api.producta.com, api.productb.com, etc) that we want to migrate into a single database. When writing the user migration scripts, it appears that the database is expected to map to a single api via Login and GetUser scripts: Database ProductA points at api.producta.com.

Is there a good strategy for turning on a trickle migration from multiple sources into a single database? Or after finishing the migration for a product, can I at least migrate the users into another database? I want all the clients to be able to use a single Realm to login, not have to know what source product the user came from.

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