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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.
Flow imager is a tool I use to apply the style you see in the pic. It's a great tool, highly recommend: https://github.com/serycjon/vpype-flow-imager. As for the corner, I use painter's tape to cover the corner so I don't get ink on the paper when I am testing the pen height.
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