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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You are right, there are very few images. There is a documentation how anybody can add image of a card to this project https://github.com/bessarabov/home-assistant-cards/blob/master/docs/how_to_add_image.md , but I don't get a lot of image contributions.
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Hence, a higher number means a more popular project.