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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.
Several replies mention django signals. That's an option, but a similar tool that provides a much clearer/cleaner implementation is django-lifecycle.
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Hence, a higher number means a more popular project.