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feat(sdk): embedded WASM query engine (DuckDB?) for on-device queries/aggregations #257

Description

@EricAndrechek

Area: sdk — backlog feature (SDK epic) · promoted from #194

What: an embedded WASM engine (DuckDB or similar) to run queries/aggregations locally over streamed/cached data.

Context: offloads aggregation/filtering to the browser over already-delivered data — fewer round-trips, richer client-side analytics on live streams.

Scope: evaluate DuckDB-WASM (or similar); define what runs locally vs. server-side and how it reads streamed/cached rows. Large / speculative — triage before promoting.

Related: SDK epic #194; shared client cache + multiplexing (filed alongside).


Promoted from the #194 SDK-epic backlog ("Later / not yet scoped"); 2026-06-04.

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