exception handling regarding yum plugins

Hi!

I wondered why exceptions from plugins are currently not handled
more gracefully. While developing a plugin for yum I had some
exceptions thrown from my plugin. This led to some inconsistency
in my yumdb-history.sqlite:

tid|name|epoch|version|release|arch|pkgtupid|state|done|nevra
52|VirtualBox-3.2|0|3.2.6_63112_fedora13|1|x86_64|2439|Updated|FALSE|VirtualBox-3.2-0:3.2.6_63112_fedora13-1.x86_64
62|VirtualBox-3.2|0|3.2.6_63112_fedora13|1|x86_64|2439|Updated|FALSE|VirtualBox-3.2-0:3.2.6_63112_fedora13-1.x86_64

Especially the transaction data from /var/lib/yum/yumdb is missing.
Otherwise, if plugins should disrupt yum, how should I deal with that
inconsistencies? Is there a tool to synchronize rpmdb and yumdb and
spits out a warning if packages are missing?

(I'm currently working on a yum-auditing tool to gather the data of
package-changes in a central database.)

Hannes