original_string: public function clean()
      {
          $delay = self::OUT_OF_SYNC_TIME_LIMIT;
          $query = $this->pdo->prepare(<<<SQL
  DELETE FROM robotstxt__delay0
  WHERE delayUntil < ((UNIX_TIMESTAMP() - :delay) * 1000000);
  SQL
          );
          $query->bindValue('delay', $delay, \PDO::PARAM_INT);
          return $query->execute();
      }
code: public function clean()
      {
          $delay = self::OUT_OF_SYNC_TIME_LIMIT;
          $query = $this->pdo->prepare(<<<SQL
  DELETE FROM robotstxt__delay0
  WHERE delayUntil < ((UNIX_TIMESTAMP() - :delay) * 1000000);
  SQL
          );
          $query->bindValue('delay', $delay, \PDO::PARAM_INT);
          return $query->execute();
      }
code_tokens: public function clean ( ) { $ delay = self :: OUT_OF_SYNC_TIME_LIMIT ; $ query = $ this -> pdo -> prepare ( <<<SQL
  DELETE FROM robotstxt__delay0
  WHERE delayUntil < ((UNIX_TIMESTAMP() - :delay) * 1000000);
  SQL ) ; $ query -> bindValue ( 'delay' , $ delay , \ PDO :: PARAM_INT ) ; return $ query -> execute ( ) ; }
docstring: Clean the delay table
  
  @return bool
docstring_tokens: Clean the delay table