add and remove instance keeping the log

Hi

Imagine something like:

def Model_A(models.Model):
    number = models.IntegerField()
    date = models.DateField()

Add an instance of the Model_A
Delete an instance of the Model_A
Add other instance of the Model_A
Delete other instance of the Model_A


Then when I do a query on database I whould like to retrive the log of all operations on Model_A and the sum of Model_A.objects.count()

What should I put in the view?

Thanks

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