Solved it!

Nice solution. I removed my delegate and reimplemented these functions in my model:
Qt Code: 
  1. /* Reimplemented function: flags
  2.  * Set the att coulumn editable flag
  3.  */
  4. Qt::ItemFlags EconomyHoursModel::flags( const QModelIndex &index ) const
  5. {
  6.     Qt::ItemFlags flags = QSqlQueryModel::flags( index );
  7.  
  8.     if( index.column() == 5 )
  9.         flags |= Qt::ItemIsEditable | Qt::ItemIsUserCheckable;
  10.  
  11.     return flags;
  12. }
  13.  
  14. /* Reimplemented function: data
  15.  * Have to reimplement this in order to show a checkbox when not editing the table
  16.  */
  17. QVariant EconomyHoursModel::data(const QModelIndex &index, int role) const
  18. {
  19.     QVariant ret;
  20.  
  21.     if( role == Qt::CheckStateRole && index.column() == 5 )
  22.     {
  23.         if( QSqlQueryModel::data( index, Qt::DisplayRole ).toString() == "" )
  24.             ret = Qt::Unchecked;
  25.         else
  26.             ret = Qt::Checked;
  27.     }
  28.     else if( role == Qt::DisplayRole && index.column() == 5 ) //Don't show date as text
  29.     {
  30.         ret = QVariant();
  31.     }
  32.     else
  33.     {
  34.         ret = QSqlQueryModel::data( index, role );
  35.     }
  36.  
  37.     return ret;
  38. }
  39.  
  40. /* Reimplemented function: setData
  41.  * Sets data for the att column
  42.  */
  43. bool EconomyHoursModel::setData( const QModelIndex &index, const QVariant &value, int role )
  44. {
  45.     bool ret = false;
  46.  
  47.     if( role == Qt::CheckStateRole )
  48.     {
  49.         if( index.column() != 5 )
  50.             return false;
  51.  
  52.         QModelIndex idIndex = QSqlQueryModel::index( index.row(), 0 );
  53.  
  54.         int id = data( idIndex ).toInt();
  55.  
  56.         QString storeValue = "";
  57.  
  58.         if( value.toInt() == Qt::Checked )
  59.             storeValue = QDate::currentDate().toString( "yyyy-MM-dd" );
  60.  
  61.         clear();
  62.  
  63.         QSqlQuery query;
  64.         query.prepare( "UPDATE hours SET att=? WHERE id=?" );
  65.         query.addBindValue( storeValue );
  66.         query.addBindValue( id );
  67.  
  68.         ret = query.exec();
  69.  
  70.         if( ret )
  71.             refresh();
  72.     }
  73.     else
  74.     {
  75.         ret = QSqlQueryModel::setData( index, value, role );
  76.     }
  77.  
  78.     return ret;
  79. }
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Thanks for pointing me in the right direction!!!

//John