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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.
I found the QRCoder library (https://github.com/codebude/QRCoder) which seems great to create QR-Codes but it seems the project is no longer maintained. What are you using in your current developments instead? Most promising was itonbarcode which costs a few hundread bucks (a year) which is way to much for a personal project only a few people will see anyways.
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