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Huh. Disregard what I wrote entirely, then. Reading through https://github.com/WICG/file-system-access/blob/main/AccessH..., I can see how they’ve bypassed most or all of the problems I saw—I was making unnecessary assumptions.

Thank you for correcting me. I am now enthusiastic about OPFS.

...but then the OPFS will be a quite decent fit. We (DuckDB-Wasm) are also looking closely at OPFS.

IMHO the requirement here is not even to get to full ACID.

With OPFS, we will get close enough to IndexedDB on steroids and bypassing the js heap limits through out-of-core operators.

After all, we are still running in a browser.

So I see the value of Wasm-based databases to be a front-facing accelerator, not a substitute for robust storage solutions.

Great to see this kind of pleasant discourse on HN!