Signalapp doesn't actually delete messages when they're deleted (either manually or by automation)

General
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1

https://sintonen.fi/advisories/signal-deleted-but-not-forgotten.txt

2

I don’t think this is a new thing? I seem to recall this coming up a few times in various places and going back many years.

There’s been discussions over on the Signal forum, and across many threads.

I seem to recall discussions about plaintext years ago and there were some improvements. As the piece you’ve posted says, it’s encrypted.