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I created a new #HomeAssistant helper to simplify keeping track of min/max values where I wanted to have control over when they were reset, saving creating template sensors and automations to do it for each entity.
I use it for daily garden min/max temperatures, can be used for things like tracking the peak generation on solar installations and being generic it's up to you on how you use it.
First release so use with caution.
https://github.com/andrew-codechimp/HA-Periodic-Min-Max