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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.
There's a guy Matthew Cieplak with a YT channel/company called Extralife who made a quite richly featured sequencer based on Arduino, and I think his code's up on Github - it's probably complicated by all the features he's built in but if you want to take a look, that's there...
NOTE:
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