Wipe all messages from a chat. Chat owner or Admin+ only.
Deletes all messages from the chat’s portal stream, broadcasts aDocumentation Index
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portal:cleared event, restarts the wipe scheduler, rotates the encryption epoch (forward secrecy), and emits a system message to the chat.
Authorization: Chat owner can always clear their own chat. Admin+ can clear any chat. Moderators cannot clear messages.
true if the operation succeeded.