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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.
What are you looking for, php engines? They are, some are written, examples: https://gitlab.com/postmill/Postmill. I am doing Agouti myself, but it is only being developed, it in php, but this is more for now an educational project agouti demo, etc.
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