Sorry very late reply.

But yes we use pouch+couch to one way sync from our server to thousands device.

And from our sales force device to our server while we still save the data in pouch, we choose to use pwa's service worker to send directly to postgresql instead of pouchdb-couchdb sync.

Thanks for the reply. And I guess you do the service worker -> postgresql thing to avoid the database-per-user setup with pouch-couch 2-way sync?