-
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.
Since you are working with mu4e's threading you could also look into this. When it worked it was pretty useful https://gitlab.com/ambrevar/mu4e-conversation
https://github.com/rougier/elegant-emacs - same author
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.