Removed extraneous closing parenthesis

With it, the delete barfed:

DELETE 
            FROM events 
            WHERE NOT EXISTS (
           SELECT svclosteventid 
             FROM outages 
            WHERE svclosteventid = events.eventid
	    UNION
           SELECT svcregainedeventid 
             FROM outages 
            WHERE svcregainedeventid = events.eventid
            UNION
           SELECT eventid 
             FROM notifications 
            WHERE eventid = events.eventid)
              AND eventtime < now() - interval '6 weeks');
ERROR:  syntax error at or near ")"
LINE 15:               AND eventtime < now() - interval '6 weeks');
                                                                 ^