createOrUpdate.js

 Event.findOne({type:event.type,session_id:event.session_id,timestamp:event.timestamp}).then(function(data){
        if(data){
            data.params =event.params;
            return Q.ninvoke(data,'save')
        }else{
          return Event.create(event).then(Event.publishCreate);
        }
    }).fail(sails.log.error);