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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.
Yeah, lume is not a tiny library, but you can simply take only the functions you need from it. It's source code is very easy to read and (de)serialization implemented there in pretty minimalistic way.
I use lua-cjson (https://github.com/mpx/lua-cjson) as it offers a standard way of value serialization (not only tables). Ofc forget about serializing non-json values such as functions and user datas.
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