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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.
And from pyttsx3/driver.py it seems like espeak is what would be used by linux normally, so maybe setting up espeak for windows is your best bet at setting up and accessing custom voices.
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