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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.
There are Linux solutions to this, macOS makes apps request permissions to important folders/ full disk access, any operating system should let you run something as a locked-down user without read/write access to your important files, etc. Installing Obsidian on Linux using flatpak or recent macOS + a firewall would let you manage a lot of the risks there, for example.
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.