/usr/share/sip/PyQt4/QtSql/ is in python-qt4-dev 4.12.1+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/sip/PyQt4/QtSql/QtSqlmod.sip
/usr/share/sip/PyQt4/QtSql/qsql.sip
/usr/share/sip/PyQt4/QtSql/qsqldatabase.sip
/usr/share/sip/PyQt4/QtSql/qsqldriver.sip
/usr/share/sip/PyQt4/QtSql/qsqlerror.sip
/usr/share/sip/PyQt4/QtSql/qsqlfield.sip
/usr/share/sip/PyQt4/QtSql/qsqlindex.sip
/usr/share/sip/PyQt4/QtSql/qsqlquery.sip
/usr/share/sip/PyQt4/QtSql/qsqlquerymodel.sip
/usr/share/sip/PyQt4/QtSql/qsqlrecord.sip
/usr/share/sip/PyQt4/QtSql/qsqlrelationaldelegate.sip
/usr/share/sip/PyQt4/QtSql/qsqlrelationaltablemodel.sip
/usr/share/sip/PyQt4/QtSql/qsqlresult.sip
/usr/share/sip/PyQt4/QtSql/qsqltablemodel.sip