When a build was successfull and there was already a matching svn tag, the previous tag gets deleted.

That should not happen, as this massively breaks traceability of releases.

When talking about a "tested, quality approved release 2.2" , nobody knows if "the old 2.2" or "the new 2.2" was working as specified in quality assurance, while the other did not.

Therefore a global option to prevent removal of svn tags would be really appreciated.

In case there a situations where deletion of old svn tags is desired, there could also a be job-based override option for this, but an option to prevent those tag deletions by accident really would help maintaining traceability of release versions.