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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.
I think you'll find a lot of people claiming its overkill, but it will have excellent documentation for both sides, offer reasonable speed, and let you hash out the actual logic of your system without worrying too much about if your low-level implementation is correct. Two good frameworks for the server would be Actix or Rocket. For the client, i'd reccomend either using reqwest or ureq. From there, you can just set up a few POST endpoints, and get to going.
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