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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.
Have you considered ZSON? It requires you to compile a dictionary based on sample data - but given you're expecting most of your data to fit one of two variations this could be quite space efficient.
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