new_contents: from consts.notification_type import NotificationType
  from notifications.base_notification import BaseNotification
  
  
  class SchedulePostedNotification(BaseNotification):
  
      def __init__(self, event):
          self.event = event
  
      def _build_dict(self):
          data = {}
          data['message_type'] = NotificationType.type_names[NotificationType.SCHEDULE_POSTED]
          data['message_data'] = {}
          data['message_data']['event_key'] = self.event.key_name
          data['message_data']['event_name'] = self.event.name
          data['message_data']['first_match_time'] = self.event.matches[0].time
          return data
  
subject: Add notification for schedule being posted