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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.
A directed acyclic word graph 'might' also work for you. Maybe try looking into DawgSharp to see if it will meet your needs, though its better with readonly or infrequently modified data.
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