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FBI Extracts Suspect’s Deleted Signal Messages Saved in iPhone Notification Database
(www.404media.co)
This is a most excellent place for technology news and articles.
You might be getting pull notifications, that's generally the workaround for push notifications being disabled - it generally increases battery usage because it forces the app to stay open in the background.
websocket based push notifications is still called push notifications in signal. this is the first time I hear the term "pull notifications", I don't think it's widely used.
Molly supports unified push
That would make sense.