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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.
Be careful with that Deque implementation. It's several years old and a bug I found in 2015 hasn't been fixed: https://github.com/tejacques/Deque/issues/8
Want to add. Your description also sounds like Circular Buffer. C# does not have a circular buffer implementation but you can use this https://github.com/joaoportela/CircularBuffer-CSharp
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