BTW.
I proposed to manually start a timer - and see how it is reflected in History.
Funny thing that I see no changes of my timer in History))))):
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Open History with the timer in one tab.
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On another tab - open more-info for the timer - and start it.
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On the History tab I see changes:
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Refresh the page or reopen the History - it has no changes:
It may happen only for entities excluded from Recorder.
But there are no mentions in “recorder.yaml” (which has “exclude” rules) for the timer.
On another test HA setup - which has no “recorder.yaml” specified - the history of the timer is shown.