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audit-trigger
Simple, easily customised trigger-based auditing for PostgreSQL (Postgres). See also pgaudit.
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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.
Related project: https://github.com/2ndQuadrant/audit-trigger
And for a practical use case for geography software, a history viewer for qgis: https://github.com/qwat/pg-history-viewer
NOTE:
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Hence, a higher number means a more popular project.