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This is primarily a feature for onboarding, where an organization administrator might send a bunch of random test messages as part of joining, but then want a pristine organization when their users later join. But it can theoretically be used for other use cases (e.g. for moderation or removing threads that are problematic in some way). Tweaked by tabbott to handle corner cases with is_history_public_to_subscribers. Fixes #10912.