Function makeHistoryRing

app/src/UI/Dashboard.cpp:80–84

* @brief Builds a scrolling-history ring for the visible window plus headroom, so a * saturated min/max source (two slots per decimation cell) still spans the full * axis instead of erasing at the left edge; the surplus samples sit off-screen. */

 *        axis instead of erasing at the left edge; the surplus samples sit off-screen.
 */
static DSP::TimeRing makeHistoryRing(const double plotTimeRangeSec)
{
  const double window = plotTimeRangeSec * kTimeRingHeadroom;
  return DSP::TimeRing(timeRingCapacity(window), window);
}

/**
 * @brief Composite snapshot key: dataset uniqueIds repeat across sources, so the time-ring