Yes! I think it's hard for people in the 1st world to imagine that not everyone can get data whenever they want. In one country even YouTube added a feature for downloading and saving videos for offline viewing because they knew that internet was often slow or unreliable.

i'm currently thinking about building something similar - do you mind sharing more about what tech stack you used, esp. how you handled the offline data and syncing?

Was PouchDB / CouchDB used? I've found that it works marvelously for no-hassle syncing.

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?