DB::check( bool $force = false )

	public function check( $force = false ) {
		// If the db_version option is set for the site and contains a semantic version number, it is a legacy version.
		$db_version = get_option( $this->get_prefix() . 'db_version' );
		if ( is_string( $db_version ) && false !== strpos( $db_version, '.' ) ) {
			$legacy_upgrades = new Legacy_Upgrades( $this->get_prefix() );
			$legacy_upgrades->upgrade( $db_version );

			delete_option( $this->get_prefix() . 'db_version' );
		}

		parent::check( $force );
	}