Hi,
u1db-qt in unstable can't migrate to testing because the QA
infrastructure couldn't reproduce the binary packages in unstable while
it could reproduce the version in testing [1, 2].
Feel free to reach out if you need help debugging the problem.
Alternatively you can ask the release team for an exception [3].
Cheers Jochen
[1] https://qa.debian.org/excuses.php?package=u1db-qt
[2] https://lists.debian.org/debian-devel-announce/2026/05/msg00001.html
[3] https://lists.debian.org/debian-devel/2026/05/msg00383.html