protected function release_reserved() {
		$expired = $this->datetime( -300 );

		$sql = $this->database->prepare( "
				UPDATE {$this->jobs_table}
				SET attempts = attempts + 1, reserved_at = NULL
				WHERE reserved_at <= %s", $expired );

		$this->database->query( $sql );
	}
protected function release_reserved() {
		$expired = $this->datetime( -300 );

		$sql = $this->database->prepare( "
				UPDATE {$this->jobs_table}
				SET attempts = attempts + 1, reserved_at = NULL
				WHERE reserved_at <= %s", $expired );

		$this->database->query( $sql );
	}
protected function release_reserved ( ) { $ expired = $ this -> datetime ( - 300 ) ; $ sql = $ this -> database -> prepare ( "
				UPDATE {$this->jobs_table}
				SET attempts = attempts + 1, reserved_at = NULL
				WHERE reserved_at <= %s" , $ expired ) ; $ this -> database -> query ( $ sql ) ; }
Release reserved jobs back onto the queue.
Release reserved jobs back onto the queue .