Changelog

Unreleased

DuckDBTransport (quixviz.DuckDBTransport) — local SQL transport backed by DuckDB over parquet files. Implements the same Transport protocol as QuixClient, so charts swap in with no other changes. Pins the session to UTC and strips tz-aware datetimes so the output matches the HTTP/CSV transport regardless of host timezone.
Marimo state-driven zoom loop — zoom_from_selection(value, set_win) helper in quixviz.notebook translates a plotly box-select payload into a new window via mo.state. Pairs with marimo_chart(chart), which primes the figure for horizontal box-select zoom.
Offline LOD demo (examples/demo_marimo_local.py) — marimo notebook over locally-generated synthetic telemetry. Slider runs in hours-from-start so handle labels stay readable; datetime range and bucket size shown in the readout.
Synthetic data generator (examples/generate_demo_data.py) — writes demo_telemetry.parquet with layered 24 h / 1 h / 1 min / 1 s sinusoids plus noise across multiple drivers, so each zoom level reveals new structure. Default: 4.32 M rows at 50 Hz over 24 hours.
[local] optional extra pulling in duckdb>=0.10 and pyarrow>=14.
.env.example documenting QUIX_LAKE_URL / QUIX_LAKE_TOKEN.

Axis misalignment by local timezone offset — the pinned x-axis range was emitted as tz-aware UTC ISO (…+00:00) while DuckDB's time_bucket output landed as tz-aware UTC in pandas. The browser converted both to the host's local timezone independently, drifting the data away from the axis window by the local offset (most visible on BST machines as a ~1 h gap). _ms_to_axis_range now emits naive UTC ISO, and DuckDBTransport.execute strips tz from datetime columns so data and axis live in the same frame.
PlotlyRenderer.update now accepts x_range — pins the visible axis to the queried window. Without this, sparse data collapsed the axis to wherever rows happened to exist, hiding the fact that coarse zooms still returned the requested span.

Secrets removed from example sources. smoke_ac_telemetry.py, demo_marimo.py, and demo.ipynb now require QUIX_LAKE_URL and QUIX_LAKE_TOKEN environment variables instead of silently falling back to a hardcoded SDK token. .ipynb_checkpoints/ directory (which held stale copies) removed; .gitignore now excludes it.
Marimo demo UX — slider runs in hours-from-start instead of raw ms (handles render as 12.50 not 1.8e12); readout shows a full datetime range with bucket and point count. In-chart rangeslider / rangeselector disabled in the local demo so the top slider is the single zoom path (the in-chart ones are browser-only and can't refetch).

The Plotly in-chart rangeslider is browser-side zoom only: no Python callback, no refetch. In Jupyter, attach_jupyter bridges in-chart zoom back via FigureWidget relayout events. In marimo, use zoom_from_selection for the equivalent feedback loop.