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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.
Why does it have to be a web app? It does not meet your requirements, but when I looked into this sort of task before, the best option looked like Gramps [0], which was discussed at [1].
[0] https://gramps-project.org
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