Hello. I've such db model:

from datetime import datetime    

class TermPayment(models.Model):
    dev_session = models.ForeignKey(DeviceSession, related_name='payments')
    user_session = models.ForeignKey(UserSession, related_name='payment')
    date = models.DateTimeField(default=datetime.now(),blank=True)
    sum = models.FloatField(default=0)
    cnt = models.IntegerField(default=0)

    class Meta:
        db_table = 'term_payments'
        ordering = ['-date']

and here new instance is added:

# ...
tp = TermPayment()
tp.dev_session = self.conn.session # device session hash
tp.user_session = self.session # user session hash
tp.sum = sum
tp.cnt = cnt 
tp.save()

But i've a problem: all records in database have the same value in date field - the date of the first payment. After server restart - one record have new date and others have the same as first after restart. It's look like some data cache is using but I can't found where.

database: mysql 5.1.25

django v1.1.1