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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.
Not an ORM, but if your application can get away with an in-memory "database", then I highly recommend bknr.datastore. It is a pleasure to use.
others cited https://github.com/ruricolist/cl-yesql and https://github.com/marijnh/Postmodern (now the links will appear on your system…)
NOTE:
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Hence, a higher number means a more popular project.