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signal-export
Export and backup your Signal chats to markdown files with attachments, in a format that can be exported to PDF. (by LiroyvH)
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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 wrote a program which can export messages (in plain text) and media from Signal Desktop. It runs on Linux, and maybe also on macOS. It might not be exactly what you'd consider simple. But I'm not aware of an easier alternative. If you need help, feel free to let me know.
You can try https://github.com/liroyvh/signal-export instead of the sigtop one isn’t working. This worked for me on my Mac. Linux is supported too.