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When you run `kv = await Deno.openKv()` locally it opens a SQLite database. On Deno Deploy it opens a connection to FoundationDB. How does that mechanism work? Is it using the same URL mechanism as the new Deno.openKv(URL) thing?

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Yes, sort of - on Deno Deploy the authentication doesn't come from a token in env vars, but from intrinsic security tickets baked into the Deno Deploy system. Also, it's a bit faster on first connect, because compared to KV connect we can skip the metadata exchange[1] because the information it provides is already present in Deno Deploy through other means. Both the backend service and frontend API (JS->KV) is the same though :)

[1]: https://github.com/denoland/deno/blob/be1fc754a14683bf640b7b...

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