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The demo does not use a back-end service.

We are agnostic to back-end frameworks. Some users have used Prisma + Graphql, NoSQL databases etc.

The Sheet data structure on the UI can be flexible too. It can come from streaming data source, lazily loaded on-demand or all stored in browser memory

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Admittedly, I haven't clicked on the link, but you appear to have avoided their question altogether. You offer product demos. Those demos source data from something, be it a JSON file, REST API, etc. Where is the demo data sourced from?

The demo data is sourced partially from US Covid database.

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