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I see that I can use API_HOST to provide url. So I can create two services with different ports, yes? But still MonboDB is problematic:D

Mongodb is required. You could use MongoDB Atlas, which is a managed service that runs on top of GCP. They have a generous free tier. For the ports, you can run multiple containers, one for the front end and one for the back end and just expose one port each.

@future-teacher-7046, I know one of the engineering leads and managers for MongoDB Atlas. He’s one of the most amazing engineers and people I know. DM if an intro is ever wanted.

Will consider mongo and also forking growth book to use Datastore:D