Okay, possibly, but if the history contains “gaps” the graph would just render a horizontal line until the next available history entry.
I can’t recreate this so if you could do me a favor (if possible) and grab the sensor history and send it my way so I can debug this issue.
You can fetch the history manually by running the following bash script.
curl -X GET -H "Authorization: Bearer LONGLIVED_TOKEN” \
-H "Content-Type: application/json" \
http://localhost:8123/api/history/period/2019-02-02T00:00:00+02:00?end_time=2019-02-09T00%3A00%3A00%2B02%3A00&filter_entity_id=sensor.solar_energievandaag
You’ll need to create a long lived token in HA and replace “LONGLIVED_TOKEN” in the snippet above with the one you’ve generated. Then replace localhost/port to match your HA setup.
Thanks!