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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 checked this in their Github and I thin you're right, the Nextcloud whiteboard integration went absolutely tits up. It was abandonded by it's main contributor around april last year. He still works for Nextcloud and commits a lot into other NC repositories, tho.
Looking at their milestones on Github I would guess that they plan to announce Nextcloud 24 in a month: https://github.com/nextcloud/server/milestones
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