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See this all working together in the "dumb version" implemented in this test. The test creates two databases in memory, inserts values into one and merges changes between each other to validate that the two databases end up in the same state. After implementing this I'm feeling confident that the method will work, and I have everything needed for the back-end server to implement merging of database states.
We can solve this with a service! Now there are many ways I could have started, but I decided to test out gRPC along the way. This was a mistake. I hoped for the best, but gRPC ended up not being a good choice for the web client. Why? you ask. The gRPC protocol works with all the bells and whistles of http when used server to server, but web clients are not as great. The Javascript client is dependent on http 2.0, and it requires a proxy like Envoy to work with a browser. What's more, I didn't love the structure of the generated web client. So through the process of working on this 'local first stack' I actually got sucked in to a big rabbit hole in making the rpc system work. I ended up going with Connect which is a tool that can create a service from a protobuf service definition, that also talks a simple http 1.1 protocol. What ultimately sold me on this solution as the best is that it also came with a very nice to use web client generation, and even plugs in to my favorite react http helper useQuery.