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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.
It might be the hygdata set which can be found here: https://github.com/astronexus/HYG-Database
It currently says it has the "Hipparcos-Yale-Gliese" database, with 119,614 stars and the "Tycho-2/Gaia" subset with 118,971 stars. That seems pretty close to the numbers quoted in the demo.
I used it previously for a matrix math conversion project translating the NIST JAMA library into a Javascript library.
If interested, the test page as a githack link can be found here. Click the "Run 3D Ellipse Fitting on Nearby (100 LY) Stellar Data". My example only uses the 25,000 out to 100 LY.
https://rawcdn.githack.com/conceptualGabrielPutnam/JAMA4JS/2...