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@@ -146,6 +146,9 @@ Note that this callback is called when the event has already been processed and
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into the room, which means this callback cannot be used to deny persisting the event. To
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deny an incoming event, see [`check_event_for_spam`](spam_checker_callbacks.md#check_event_for_spam) instead.
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+For any given event, this callback will be called on every worker process, even if that worker will not end up
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+acting on that event. This callback will not be called for events that are marked as rejected.
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+
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If multiple modules implement this callback, Synapse runs them all in order.
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### `check_can_shutdown_room`
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