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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.
I think there are already Plasma menus that do almost the thing you want. For example https://store.kde.org/p/1160672, https://store.kde.org/p/1367167 or https://store.kde.org/p/1367178 . Maybe it would just be better contributing to those instead of starting completely from scratch. But in the end you decide.
NOTE:
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Hence, a higher number means a more popular project.