public function safeUp()
 {
     $table = new Postmaster_NotificationSentRecord();
     $this->addColumnAfter($table->getTableName(), 'senderId', ColumnType::Int, 'notificationId');
     return true;
 }
 public function getSentNotifications()
 {
     $record = new Postmaster_NotificationSentRecord();
     $query = craft()->db->createCommand()->select('*, count(dateCreated) count')->from($record->getTableName())->group('dateCreated');
     return $query->queryAll();
 }