Delete the last N messages in a chat (mod+ only).
Deletes the most recent N messages from the chat’s portal stream regardless of sender, and broadcasts aDocumentation Index
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message:bulk_deleted event to all connected clients.
Authorization: Chat owner can always delete. For public/official chats, any user who outranks the chat owner (Mod+) can also delete. Moderators cannot delete in private chats.
count if the chat had fewer messages).