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I've been very curious about electric -- the idea of giving your application a replicated subset of your databse, using your api as a proxy, is quite interesting for apps where the business layer between the db and the client is thin (our case).

edit: Also their decision to make it just one way sync makes a LOT of sense. Write access brings a lot of scary cases, so by making it only read sync eases some of my anxieties. I can still use Rest / RPC for updating the data

more the basis for building your own backend sync-solution in Go than a complete product, this library does an rsync-like protocol to minimize data transferred to sync up two filesystems; its very general building block:

https://github.com/glycerine/jcp

https://rxdb.info/ is a good one.

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