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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.
You can have a look at https://www.handsonscala.com/ and see if that's for you!
Is play-framework a strong requirement? If not, you might have an easier time building a simple API and serializing JSON with the lihaoyi ecosystem, namely cask as the microframework and uPickle/uJson.
BEWARE: uJson is vulnerable under DoS attacks
Here is a simple Play project with Netty backend and jsoniter-scala serialization.
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.