What does such statuses as open and closed mean in Notifications section?
A status closed have notifications with a message, which has been already sent to a customer, that a price for this product has been decreased.
Also a status closed is supposed to be set in a case, if a notification was created by a customer for a limit period of time (e.g. notification is actual within two weeks) and this time has been expired already. Otherwise, notifications have open status.
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