There's a web browser version of datasette called datasette-lite which runs on Python ported to WASM with Pyodide which can load SQLite databases.

I grafted the enhanced lazyFile implementation from emscripten and then from this implementation to datasette-lite relatively recently as a curious test. Threw in a 18GB CSV from CA's unclaimed property records here

https://www.sco.ca.gov/upd_download_property_records.html

into a FTS5 Sqlite Database which came out to about 28GB after processing:

POC, non-merging Log/Draft PR for the hack:

https://github.com/simonw/datasette-lite/pull/49

You can run queries through to datasette-lite if you URL hack into it and just get to the query dialog, browsing is kind of a dud at the moment since datasette runs a count(*) which downloads everything.

Example: https://datasette-lite-lab.mindflakes.com/index.html?url=htt...

Still, not bad for a $0.42/mo hostable cached CDN'd read-only database. It's on Cloudflare R2, so there's no BW costs.