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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.
Check it out here: https://passport.covid.tools (and it's Open-Source)
In addition: I'm almost done writing (and hopefully soon publishing) a open source Java library for reading the passes: https://github.com/Goodie01/nzcp4j
Yes, and also to copy the broad strokes of the equivalent EU specification
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