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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.
If you are solely linking to resources within your application, you should read on and consider using Rails Global Id. It also handles expiry, we've used them at every Rails company I've worked at. Best part is you don't need to worry about storing them in your DB.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.