code: protected static function upgradeClosed()
      {
          $objDB = self::DB();
  
          // Change isclosed to iseditable, iscreatable and isdeleteable.
          if ($objDB->tableExists('tl_metamodel_dca', null, true)
              && !$objDB->fieldExists('iseditable', 'tl_metamodel_dca')) {
              // Create the column in the database and copy the data over.
              TableManipulation::createColumn(
                  'tl_metamodel_dca',
                  'iseditable',
                  'char(1) NOT NULL default \'\''
              );
              TableManipulation::createColumn(
                  'tl_metamodel_dca',
                  'iscreatable',
                  'char(1) NOT NULL default \'\''
              );
              TableManipulation::createColumn(
                  'tl_metamodel_dca',
                  'isdeleteable',
                  'char(1) NOT NULL default \'\''
              );
  
              $objDB->execute('
                  UPDATE tl_metamodel_dca
                  SET
                      iseditable=isclosed^1,
                      iscreatable=isclosed^1,
                      isdeleteable=isclosed^1
              ');
  
              TableManipulation::dropColumn('tl_metamodel_dca', 'isclosed', true);
          }
      }
docs: Upgrade the database to change from closed dca to editable, creatable and deletable.
  
  @return void