IntegrityError: (1062, “Duplicate entry ‘1830327-1792993’ for key ‘some_instance_A_id’”) but no UNIQUE constraint

Maybe someone here knows this problem:

http://stackoverflow.com/questions/3079890/integrityerror-1062-duplicate-entry-1830327-1792993-for-key-some-instance

?

It happens rarely, randomly (although it might not be really random)
and currently I don't have idea what to look for to fix it (it also
doesn't have high priority for me, but if some of you knows this
problem then I'll be happy to fix it sooner than later).

--
Tomasz Zielinski
http://pyconsultant.eu

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