Using one query set for another query

Hello all,

    I am trying to use the query of:
paid_bills = bill_payment_history.objects.filter(date_paid__year='2023', date_paid__month='03')

as criteria for another query to only show the unpaid bills.

The known_bills model is my control list of known bills that occur frequently.

The  bill_payment_history model is my bill transaction table.  It is a running history of transactions for bill payment.

A sample of known_bills records is:

bill_1

bill_2

bill_3

A sample of  bill_payment_history is:

bill_1 paid last month

bill_2 paid last month

bill_3 paid last month

bill_1 paid this month

bill_2 paid this month

bill_3 paid this month

What I am trying to do is use bill_payment_history filtered on date_paid by year and month and query the known_bills table to see what bills have not been paid yet.  I keep trying something similar to:  results = paid_bills.exclude(short_description__in=known_bills)

but my results either keep coming up with all of the records or none of them.  What am I doing wrong?

Here is the model information:

class known_bills(models.Model):
    #Full bank transaction
    description = models.CharField(max_length=255)
    #String value to search the CSV file with.
    short_description = models.CharField(max_length=255, unique=True)
    #Value I know it as.
    friendly_name = models.CharField(max_length=255)
    expected_due_date = models.DateField()
    expected_cost = models.DecimalField(max_digits=6,decimal_places=2)

class bill_payment_history(models.Model):
    description = models.CharField(max_length=255)
    short_description = models.ForeignKey(known_bills, on_delete=models.CASCADE)
    friendly_name = models.CharField(max_length=255)
    date_paid = models.DateField()
    cost = models.DecimalField(max_digits=6,decimal_places=2)

    class Meta:
        unique_together = (
            ('short_description',
            'date_paid'),
            )

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