QAbstractTableModel don't work (Qt6.5.2 / Py 3.11 / )

Question

I use this code and it works fine:

    ....
    self.query_model = QSqlQueryModel()
    view = QTableView()
    view.setModel(self.query_model)

... but I would like to use a QAbstractTableModel because then I have more influence on the design of the table. Unfortunately my code doesn't work.

​ My changed code:

        self.query_model = QSqlQueryModel()       
        tab_model = MyTableModel(self.query_model)
        view = QTableView()
        view.setModel(tab_model)

and:

class MyTableModel(QAbstractTableModel):

    def __init__(self, model):
        super().__init__(model)
        self._model_sql = model
        self._headers = headers 

    def rowCount(self, index=None):
        return self._model_sql.rowCount()

    def columnCount(self, index=None):
        return self._model_sql.columnCount()

    def headerData(self, section, orientation, role):
        if role == Qt.ItemDataRole.DisplayRole and orientation == Qt.ItemDataRole.Horizontal:
            if section == 0:
                return "KDNr."

    def data(self, index, role=Qt.ItemDataRole.DisplayRole):
        if not index.isValid():
            print("index: " + str(index))
            return None
        elif role == Qt.ItemDataRole.DisplayRole:
            column = index.column()
            if column == 0:
                return self._model_sql.record(index.row()).value(column)
            elif column == 1:
                value = self._model_sql.record(index.row()).value(column)
                return f"RIP {value}"
            else:
                return None
        return None

The table does not appear