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Turn rows you already fetched into a Vega-Lite drawing your chat window can render. ★ IT DRAWS; IT DOES NOT FETCH. Hand it the output of `query_dataset` — this tool never touches the database, so it cannot bypass the `as_of` filter those rows were selected under. A plotting tool that fetched its own numbers would be a second data path, and a second path eventually disagrees with the first about what was knowable when. ★ GAPS BREAK THE LINE INSTEAD OF BEING BRIDGED. A missing value is emitted as null, so the rendered line stops rather than sloping smoothly across a period where nothing was published. The absent positions are also listed in `data_gaps`, because a break is easy to misread as a flat stretch. Zero is never substituted — zero draws a real low point for something that never happened. ★ THE DRAWING POINTS BACK AT THE PROOF. `citation` and `inclusion_pointer` travel with the spec, so a picture and the rows behind it name the same published checkpoint. ⚠️ Rendering, not analysis. A shape you notice in a picture is not a forecast. Args: rows, x_field, y_field, optional title and mark (line/point/bar/area).