text: 
  -- +migrate Up
  -- Add new alert_log_event type
  ALTER TYPE enum_alert_log_event RENAME TO enum_alert_log_event_old;
  CREATE TYPE enum_alert_log_event AS ENUM (
  	'created',
  	'reopened',
      'status_changed',
      'assignment_changed',
      'escalated',
      'closed',
      'notification_sent',
      'response_received'
  );
  ALTER TABLE alert_logs ALTER COLUMN event TYPE enum_alert_log_event USING event::TEXT::enum_alert_log_event;
  DROP TYPE enum_alert_log_event_old;
  
  -- +migrate Down
  
  ALTER TYPE enum_alert_log_event RENAME TO enum_alert_log_event_old;
  CREATE TYPE enum_alert_log_event AS ENUM (
  	'created',
  	'reopened',
      'status_changed',
      'assignment_changed',
      'escalated',
      'closed'
  );
  
  ALTER TABLE alert_logs ALTER COLUMN event TYPE enum_alert_log_event USING event::TEXT::enum_alert_log_event;
  DROP TYPE enum_alert_log_event_old;
  