Filter by sum of filtered related objects?

Given the following models:

class Transaction(models.Model):

  amount = models.IntegerField()

  date = models.DateField()

  terms = models.ForeignKey('Terms')

class Terms(models.Model):

  name = models.CharField(max_length=100)

  timezone = models.CharField(max_length=50)

I need to annotate Terms with the sum of the related Transaction.amount's where the Transaction.date is between two dates and what those two dates are varies by Terms.timezone.

Possible?

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