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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.
Imapfilter runs lua scripts. Since it's basically just a lua interpreter with a pre-imported library, you can pretty much do any processing you might like, but... IMHO it doesn't seem great: the documentation is so-so, the API is a bit clunky and lacks basic functionality (eg. you have to decode utf8 mime headers yourself) and (personal opinion) writing an imapfilter script is not easier than using an IMAP library in whatever your favorite programming/scripting language might be.
The most used tool to talk sieve to mail servers seems to be sieve-connect, but there are a lot of others, including a gui one that is part of KDE-pim.