Empty records in database (even with validation and ACL in place)

Hi all,

I've run into the strangest problem, and have no idea where to start
looking: I've got an community platform website, where members
(sometimes only admins) can post content. Somehow, about once a day on
different times and without other content being posted at the same
time, empty records appear in my database. As far as I know, this
shouldn't be possible:

- all models have pretty tight validation rules that should prevent
this kind of behaviour
- all add/edit methods are protected by ACL, so only users can add/
edit. Some of them are even admin-only accessible
- every save action fills the user_id field just before saving, but
the user_id for the empty records is 0 (zero)

Since the user_id isn't saved, I guess creation of the new record
doesn't happen through the add/edit methods in the controller. That
might also explain why validation rules are ignored.

As I said, don't know where to start looking. This must be triggered
by some kind of user action, but how, why and where is a huge problem
to find out. Anyone?

Jeroen
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