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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.
Not sure how this all will work with Mikotiks, though. Because the admin panel should have access to the certificates and run on Mikrotik, but the OpenVPN there is quite limited (the things you've mentioned)… If you're really into it, it would be great to see a relevant issue, so other people can support, we can discuss all details and don't forget about it :-)
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