[GENERAL] do I need replication or something else?

[Caleb Simonyi-Gindele]

We have a billing system and we want the ability to send users out into 
the field with an unconnected (no WAN, VPN etc) laptop containing our pg 
db and software. Upon their return we need to synchronize changes to the 
main db. We would like the ability to be able to have this accomplished 
at the db level rather than doing this in our app.

What is the best tool to accomplish this with?
Caleb
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