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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.
I wrote a sql layer in python to run on your node called sqlChain. If you're interested in building something like these sites then you can play with this and add modules on top. It's open source and fairly efficient (can store the blockchain in less space than a node), but requires a good system with fast SSD to be viable.
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