NotificationMarkReadEvent
data class NotificationMarkReadEvent(val type: String, val createdAt: Date, val rawCreatedAt: String, val user: User, val cid: String, val channelType: String, val channelId: String, val totalUnreadCount: Int = 0, val unreadChannels: Int = 0) : CidEvent, UserEvent, HasUnreadCounts
Triggered when the count of unread messages for a particular channel changes