Horizontal scale bar

Some way of measuring the horizontal minute of an event that is happening across multiple days, either an overlay that can display the n'th minute number, or a hard-coded scale bar line of white with 1 every 30 black minutes to be used as a scale bar.

Start by locating the Python entry point that renders the HTML heatmap and inspect how events spanning multiple days are laid out. Compare the proposed minute-number overlay and the white scale-bar alternative, then verify the chosen approach on a representative multi-day event and confirm that the minute intervals are readable.

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