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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.
https://redis.io/topics/distlock I haven't used Redis specifically for locking, but it appears to be a popular use case. Or you could probably use the locking mechanism of your database to keep track of a shared store of user IDs.
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.