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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.
In the past I have used ThirdStats Thunderbird plugin as well as the github CLI project mail-trends to find out the most frequent From addresses that I can easily bulk delete as well as the longest/biggest email threads and it worked out fairly well, the latter was a bit tricky to use with Fastmail since it was created for Gmail.
You could look at something like imapfilter. It's designed to do what you want, I think, though I've never used it.
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