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I've never used it and it's still in beta, but I think Cloudflare D1 would qualify: https://developers.cloudflare.com/d1/

"Maximum database size 2 GB (Workers Paid) beta" (but you can have up to 50.000 databases)

Oh strange, what a tiny limit. Is it kept in memory on a 32 bit machine? lol. Half our tables are bigger than that

Actually, yeah, I fully expect them to be running it inside WASM, so 32 bit...