Brenan Kelley 458c5ae657 Add statistics keep_last_sample option (#88655) ...

* introduce preserve last value option

* improve comments

* add unit test

* skip scheduling purge on a preserved value

* do not schedule sensor update if preserving last value

* fix unit test to use new mock time pattern

pattern introduced in https://github.com/home-assistant/core/pull/93499

* rename preserve_last_val to keep_last_sample

* add keep_last_sample config validation

2024-02-27 13:17:05 +01:00

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fixtures

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__init__.py

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test_sensor.py

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