Very impressive project and vision! Love the demo!

I am also ex-GS and worked on what I am fairly sure is the table display tool you're describing. I tried to carry the essential aspects of that work (multi-level pivots, with drill-down to the leaf level, and all interactive events and analytics supported by db queries) to Tad (https://www.tadviewer.com/, https://github.com/antonycourtney/tad), another open source project powered by DuckDb.

An embeddable version of Tad, powered by DuckDb WASM, is used as the results viewer in the MotherDuck Web UI (https://app.motherduck.com/).

If you're interested in embedding Tad in Pretzel, or leveraging pieces of it in your work, or collaborating on other aspects of DuckDb WASM powered UIs, please get in touch!