Не удаляет содержимое из БД

def delete(self):
    index_list = []
    line = []
    self.con = sqlite3.connect("download_db.sqlite")
    self.cur = self.con.cursor()
    for model_index in self.tableWidget_3.selectionModel().selectedRows():
        index = QtCore.QPersistentModelIndex(model_index)
        index_list.append(index)
        line.append(self.tableWidget_3.currentIndex().row())
    for lin in line:
        lin += 1
        self.cur.execute('''DELETE FROM history WHERE rowid=?''', (lin,))
        self.con.commit()
    self.con.close()
 
    for index in index_list:
        self.tableWidget_3.removeRow(index.row())

    def delete(self):
        index_list = []
        for model_index in self.tableWidget_3.selectionModel().selectedRows():
            index = QtCore.QPersistentModelIndex(model_index)
            index_list.append(index)
        title = self.tableWidget_3.model().index(self.tableWidget_3.currentIndex().row(), 0).data()
        size = self.tableWidget_3.model().index(self.tableWidget_3.currentIndex().row(), 1).data()
        self.con = sqlite3.connect("download_db.sqlite")
        self.cur = self.con.cursor()
        self.result = self.cur.execute('''DELETE FROM history WHERE title=? and size=?''', (title, size,))
        self.con.commit()
        self.con.close()
 
        for index in index_list:
            self.tableWidget_3.removeRow(index.row())