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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 it suits your purposes to work with a fast, transactional database using arrays, JSON, different types of object or any other data structures which might vary within the same collection of data, but is entirely on the local file system and doesn't rely on setting up any external database server, that's exactly why I created DocLite https://github.com/dwgebler/doclite
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Hence, a higher number means a more popular project.