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active_record_union
UNIONs in ActiveRecord! Adds proper union and union_all methods to ActiveRecord::Relation.
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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.
There is even a Gem to facilitate UNION in ActiveRecord objects: https://github.com/brianhempel/active_record_union
NOTE:
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