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FlatFiles
Reads and writes CSV, fixed-length and other flat file formats with a focus on schema definition, configuration and speed.
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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.
If this is for production code and not just learning, I've had success using FlatFiles before, which can enforce this sort of thing for you.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
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