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Nothing, I'm sure, but the idea behind GraphQL is that you can query all of the different backend services you have in a single request, reducing the network latency associated with firing off requests to all those services individually. It would seem that an emulated SQLite database would bring you right back to having to perform multiple network requests, assuming your data needs are more complex than a single relation. Under normal usage, SQLite avoids the N+1 problem by not having IPC overhead, but that wouldn't apply here.