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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'm happy with https://github.com/DarthFennec/highlight-indent-guides and Emacs 28 (with native comp) but my files are not huge, max 400 lines generally.
https://github.com/skeeto/visual-indentation-mode - works well but is fixed (doesn't read the buffer's indentation).
NOTE:
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Hence, a higher number means a more popular project.