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We open-sourced a single-machine version of the backend: https://github.com/get-convex/convex-backend
It doesn’t use Kafka, the write log is custom implemented in Rust.
Convex does not have special support for unique constraints, as they are easy to implement in your own code (like you wrote, the mutations are happening “inside” the database). This follows the philosophy of making it clear what the database primitives are, and hence what performance you can expect from the database.
Of course since your code is all JavaScript/TypeScript, it’s easy to layer in constraints via a library, like in https://labs.convex.dev/convex-ents/schema#unique-fields