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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.
It's a known fact for instance that you can determine whether a telephone number has a telegram account registered to it. (Bellingcat even released a script for it) For a government with total information about what phones are being used where and when and likely by whom, it's not too difficult to see how they could potentially track down Telegram users.
NOTE:
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Hence, a higher number means a more popular project.