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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.
Can't speak too much to the API testing, but when it comes to test data, you can either seed it yourself (i.e. write scripts), write production data transformers, or use a data generator with a programmable model you can version control (https://github.com/openquery-io/synth). Full disclosure I'm working on the Synth project, but I still think it can help your org.
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