#models.py
...
class Students(models.Model):
     fio = models.CharField(max_length=50)
     bdate = models.DateField()
     tickno = models.CharField(max_length=10)
     group = models.ForeignKey(Groups,blank=True, null=True,related_name='gruppa')
     def __unicode__(self):
          return self.fio

class ChangeLog(models.Model):
     model = models.CharField(max_length=15,blank=True, null=True)
     action = models.CharField(max_length=25,blank=True, null=True)

def ModelChangeLog(sender, instance, signal, *args, **kwargs):
     if 'created' in kwargs:
          if kwargs['created']:
               m = ChangeLog(model = sender.__name__,
                             action = "Создание записи %s" % instance.id)
               m.save()
post_save.connect(ModelChangeLog, sender=Students)

>>>q = ChangeLog.objects.all()
...     for i in q:
...     print i.model, i.action
...
Students Создание записи 38
Students Создание записи 38