Hi,

This looks like a compiler issue to me.
>     const auto connections = QSqlDatabase::connectionNames();
>     qDebug() << "Closing open connections:" << connections;
>
> claiming that
> ../../../src/server/server_database.cpp:691:45: error: invalid operands to 
> binary expression ('QDebug' and>
> 'const QList<QString>')

I think this is the place where it goes wrong: 

> ../../../../Qt6.4.2/6.4.2/gcc_64/include/QtCore/qdebug.h:217:53: note: 
> candidate template ignored: requirement 
> 'std::conjunction_v<std::disjunction<std::is_base_of<QList<QString>, 
> QString>, QTypeTraits::has_ostream_operator<QDebug, QString, void>>>' was not 
> satisfied [with T = QString]
> inline QDebugIfHasDebugStreamContainer<QList<T>, T> operator<<(QDebug debug, 
> const QList<T> &vec)
>                                                     ^

Anyhow, I couldn't reproduce this in a minimal example (and apparently you 
didn't manage either?). At minimum we need the exact compiler + compiler 
options passed on command line.

I also suggest to move this to bugreports.qt.io.

Regards

Kai

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