2021.7 History graph color changes

[koying (Chris B)]

IMHO, focusing on graphing capabilities while the history management of the DB is rather inflexible, to say the least, is probably premature.

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Recorder Retention Period By Entity

I’d like to be able to set a Recorder keep_days value for each entity. Background: New and non-technical users are steered toward running HA on a RPi with an SD card. Yet, if they take the defaults, every event and state change is recorded in the SQL database on the SD card, leading to a bloated database file and shortened SD card life. Yes, I know there are lots of ways to change these defaults, including using other databases and database locations. But for most beginners, it’s a steep learn…