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I like the tech stack. Does it provide anything like the query catalog in the OP, i.e. the table labeled "All Queries" on the OP demo page?

There‘s a query history tab, not sure if this what you want?

Otherwise, I‘m very open to feedback, just create an issue in the linked GH Repo. Thanks!

The idea is that having created a query, chart etc., you can save it for other users to run.

Yes, you can share a query, and also the visualization.