Hi all,

I was asked to design a new django app by a client whose needs are a little 
bit context-specific.

The purpose of this app is to introduce computer-assisted technologies in a 
paper-based environment, in the e-Health domain. This client would like to 
access a central server with a few mobile clients with the constraint of a 
non-permanent internet connection, because the location of the mobile 
clients is continuously changing and an internet connection might not 
always be available.

My current idea is based on a portable small server (a nettop, or even a 
raspberry pi, as the computing power is not a problem for this app) with a 
django app on it and a wireless access point for providing mobile clients 
with an always-on portable server reachability. At the same time, I'd like 
other clients around the world (a very little number, though) to still be 
able to access a central remote version of the same service, so I'd still 
deploy the same app (with its own DB replica) within a remote server.

I hope I made my client's requirements clear: how would you manage the 
synchronization between the two DBs, given that both DBs need a write 
access and that the only relaxation of this constraint is that when the 
portable server is on, the remote DB might work in a read-only mode (but 
this is not required).

Thanks in advance for any suggestions you'll provide me with.
B.

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