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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.
Maybe you want to look into the Nested Set pattern: https://en.wikipedia.org/wiki/Nested_set_model. Here is a Laravel package implemeting that: https://github.com/etrepat/baum
NOTE:
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Hence, a higher number means a more popular project.