Hm, interesting. I made this, if you want to take a look: https://github.com/TomasHubelbauer/sqlite-javascript. You can test it using the Demo link in the readme and then use the prefilled value in the Load from URL prompt. Based on this I find your idea to be very doable. I didn't do it yet, but while working on this I had async fetching of pages using Range requests on my mind. Shame I didn't get to it when I was working on this project, could be easy to put together a demo. Similar to this I made https://github.com/TomasHubelbauer/fatcow-icons which parses a big ZIP file piece-wise on demand. As you scroll, new parts of the archive are fetched and icons extracted so you don't need to download the whole thing.