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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 have also configured it that no deletes are synced, so I don't loose anything I delete by accident (sync_deletes). Also set the folderfilter to your liking. For all options check out https://github.com/OfflineIMAP/offlineimap3/blob/master/offlineimap.conf
NOTE:
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