Django, на основе разницы значений последовательных полей модели обновить значение нового поля в той же строке

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class TestLocation(models.Model):
   LOCATOR_YES_NO_CHOICES = ((None, ""), (True, "Yes"), (False, "No"))
   longitude = models.FloatField()
   latitude = models.FloatField()
   processed = models.BooleanField(
    choices=LOCATOR_YES_NO_CHOICES,
    max_length=3,
    blank=True,
    null=True,
    default=None,
)
   stay=models.CharField(max_length=100,null=True)
   duration=models.FloatField(null=True)

<

def mark_stay_location():
if TestLocation.objects.filter(processed=None):
    k = TestLocation.objects.filter(processed=None).order_by("timestamp")
    p = len(k)
    # list_lat1 = []
    # list_lat2 = []
    # list_long1 = []
    # list_long2 = []
    for i in range(p - 1):
        rowpairs = k[i : i + 2]
        lat1 = rowpairs[0].latitude
        # list_lat1.append(lat1)
        lat2 = rowpairs[1].latitude
        # list_lat2.append(lat2)
        long1 = rowpairs[0].longitude
        # list_long1.append(long1)
        long2 = rowpairs[1].longitude
        # list_long2.append(long2)
        lat = abs(lat2 - lat1)
        long = abs(long2 - long1)
        a = sin(lat / 2) ** 2 + cos(lat1) * cos(lat2) * sin(long / 2) ** 2
        c = 2 * atan2(sqrt(a), sqrt(1 - a))
        for rowpair in rowpairs:
            row_id = rowpair.id
            po = TestLocation.objects.filter(id=row_id)
            if lat < 0.0009 or long < 0.0009:
                po.update(stay="stay")
                po.update(processed=True)
            else:
                po.update(stay="on_move")
                po.update(processed=True)
    duration()
    return Response(status=status.HTTP_200_OK)

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