QSqlQueryModel and memory consumption

[lunatic fringe]

Hello,

if i create a new insatance of a QSqlQueryModel (based on sqlite database) the amount of memory is not completely freed when deleting the object.

.
        ..
        model = new QSqlQueryModel();
        model->setQuery(query);
        while(model->canFetchMore())
            model->fetchMore();
        ..
        delete model;

.
        ..
        model = new QSqlQueryModel();
        model->setQuery(query);
        while(model->canFetchMore())
            model->fetchMore();
        ..
        delete model;

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What is the correct way to do this?