Chart
Control the temperature chart and its history window.
The temperature chart is enabled by default and can be disabled with show_chart: false.
show_chart: true
chart_period: 96
The period selector supports four values: 24 for 24h, 48 for 2d, 96 for 4d, and 168 for 7d.
Changing the period updates the chart window immediately and refreshes the history data for that range.