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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.
For the ICS/365 Calendar I used this plugin (https://github.com/tybritten/ical-sensor-homeassistant) installed via HACS and configured like a normal integration. I tried a few different ones, but this worked right away and actually had the least setup. I don't have any event titles, they just show as "Busy", but that's a restriction of O365 security configuration, and is just fine for my needs.
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