post_syncdb handler never called in an app without models?

I premit that I've never used Django signals, so forgive if it's a trivial question.
I have an app without models (models.py empty), but I would like to add custom DB data after every syncdb. I thought I could use the post_syncdb signal to connect my handler method. I wrote it inside management.py and I see that this module is get called during syncdb (I used pdb.set_trace to test it), though the handler method is never called.
Does post_syncdb handlers get called only if a model is defined?

Thansk for your help.

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