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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.
Have you tried Rails Import: https://github.com/zdennis/activerecord-import
have you disabled indexes before the insert and then re-enable them? i don't know much about mongodb in practice but could you premake the db and copy then connect to it and then destroy the copy? 1500 records shouldn't take that long to import. https://github.com/sqshq/mongodb-benchmark
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