code: public function run(): void
      {
          $this->connection->query('
              ALTER TABLE
                  tl_content
              ADD
                  youtubeOptions text NULL
          ');
  
          $this->connection->query('
              ALTER TABLE
                  tl_content
              ADD
                  youtubeStart int(10) unsigned NOT NULL default 0
          ');
  
          $this->connection->query('
              ALTER TABLE
                  tl_content
              ADD
                  youtubeStop int(10) unsigned NOT NULL default 0
          ');
  
          $this->connection->query("
              UPDATE
                  tl_form_field
              SET
                  type = 'fieldsetStart'
              WHERE
                  type = 'fieldset' AND fsType = 'fsStart'
          ");
  
          $this->connection->query("
              UPDATE
                  tl_form_field
              SET
                  type = 'fieldsetStop'
              WHERE
                  type = 'fieldset' AND fsType = 'fsStop'
          ");
  
          $columns = $this->connection
              ->getSchemaManager()
              ->listTableColumns('tl_module')
          ;
  
          if (isset($columns['news_order'])) {
              $this->connection->query("
                  UPDATE
                      tl_module
                  SET
                      news_order = 'order_date_asc'
                  WHERE
                      news_order = 'ascending'
              ");
  
              $this->connection->query("
                  UPDATE
                      tl_module
                  SET
                      news_order = 'order_date_desc'
                  WHERE
                      news_order = 'descending'
              ");
          }
  
          $this->connection->query('
              ALTER TABLE
                  tl_layout
              ADD
                  externalJs BLOB DEFAULT NULL
          ');
      }
docs: {@inheritdoc}