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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.
This is similar: https://github.com/alphapapa/chromatext.el You could easily modify it to work by sentence instead of by visual line.
You could look into https://gitlab.com/ideasman42/emacs-hl-block-mode - it uses overlays to show parenthesis scope but the basic method can be used for other kinds of overlays too.
NOTE:
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Hence, a higher number means a more popular project.