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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.
With many HTTP requests, the issue will not only be a performance one but also a monetary one and only using the resources you need will help with that. For lambda, I like to use node but you can also use PHP using Bref https://bref.sh/
Have a look at Laravel Lumen A micro version of Laravel from Laravel.
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