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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 wouldn't spend too much time worrying about privacy in open-source editors. From a privacy perspective, being built on Electron isn't different from being programmed in C++ or anything else - they can still spy on you and do network requests. I'm not a fan of vscodium myself, but it sounds fine for your needs. You could run the editor in a sandbox that blocks network traffic. On Linux, this is easily done with the Flatpak and Flatseal.
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.