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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.
Guile has G-Golf and guile-gi, which both work fine. Development is not the fastest, but there has been commits within the last year at least in both. Have not had experience with other Scheme implementations. Otherwise there is always the option of doing gtk through an FFI.
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