python - postgresql drop unique constraint after changing the class definition in django -

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i had created table model class in django:

class a(models.model):     code = models.charfield(unique=true,max_length=2)     name = models.charfield(max_length=20)

later after adding data, changed model definition remove unique constraint as

class a(models.model):     code = models.charfield(max_length=2)     name = models.charfield(max_length=20)

in postgresql using psql dropped constraint as:

alter table drop constraint "unique_a_code_key";

now after 2 days, still not able add existing code value thru' django admin form. how can remove constraint not see #d+ a; in postgres

have reloaded django app, working fine. problem app started in screen few days back. after stopping application in screen , restarting, shows running in port. killed process , restarted application. well! working fine!


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