tmp.py

from datetime import datetime, timedelta

# If drop is more then 2 years old
two_years_ago = datetime.now() - timedelta(2*365)
drops = DropPoint.objects.filter(created_at__gte=two_years_ago)

for d in drops:
    # if it hasn't ordered in the last 2 years mark it as inactive
    if d.last_shipable_drop_point_trip > two_years_ago:
        d.active = False
        d.save()
    # if it hasn't placed an order on a route in the last 2 years,
    # remote it from that route.
    routes = d.route_set.all()
    trips = d.routetrip_set.filter(departure__gte=two_years_ago)
    route_trips = [i.route for i in trips]
    for route in routes:
        if route not in route_trips:
            d.route_set.remove(route)
            d.save()