By my experience, which is using Node-RED to save data to influxdb from prior to Michael adding the ability, the data is stored even if it does not change as the timestamp is available and changes. The version of Graphana I use for charting does not retrieve data items outside the queried time range so some of my graphs show an initial "no data." As a result, I save unchanged values on a regular basis by getting the current values from HomeSeer. This basis is a function of what I was graphing.
Note that a newer version of Graphana may have changed this.
Note that a newer version of Graphana may have changed this.
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