old_contents: from django.db import migrations
  
  SUBSCRIPTION_EMAIL = "email"
  SUBSCRIPTION_PUSH = "push"
  
  # PERSON/EVENT TYPES
  TYPE_NEW_ATTENDEE = "new-attendee"
  TYPE_EVENT_UPDATE = "event-update"
  TYPE_CANCELLED_EVENT = "cancelled-event"
  TYPE_WAITING_LOCATION_EVENT = "waiting-location-event"
  TYPE_WAITING_LOCATION_GROUP = "waiting-location-group"
  TYPE_EVENT_SUGGESTION = "event-suggestion"
  TYPE_ANNOUNCEMENT = "announcement"
  
  # DEFAULT PERSON/EVENT TYPES
  DEFAULT_PERSON_EMAIL_TYPES = [
      TYPE_EVENT_SUGGESTION,
      TYPE_EVENT_UPDATE,
      TYPE_NEW_ATTENDEE,
      TYPE_WAITING_LOCATION_EVENT,
  ]
  
  
  def delete_event_subscriptions_disabled(apps, schema_editor):
      Subscription = apps.get_model("notifications", "Subscription")
  
      Subscription.objects.filter(
          type=SUBSCRIPTION_EMAIL,
          activity_type__in=DEFAULT_PERSON_EMAIL_TYPES,
          person__event_notifications=False,
      ).delete()
  
  
  def reverse_deletion(apps, schema_editor):
      pass
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("people", "0005_add_subscriptions"),
          ("notifications", "0010_migrate_types"),
      ]
  
      operations = [
          migrations.RunPython(
              delete_event_subscriptions_disabled, reverse_deletion, atomic=True,
          ),
      ]
  
new_contents: from django.db import migrations
  
  SUBSCRIPTION_EMAIL = "email"
  SUBSCRIPTION_PUSH = "push"
  
  # PERSON/EVENT TYPES
  TYPE_NEW_ATTENDEE = "new-attendee"
  TYPE_EVENT_UPDATE = "event-update"
  TYPE_CANCELLED_EVENT = "cancelled-event"
  TYPE_WAITING_LOCATION_EVENT = "waiting-location-event"
  TYPE_WAITING_LOCATION_GROUP = "waiting-location-group"
  TYPE_EVENT_SUGGESTION = "event-suggestion"
  TYPE_ANNOUNCEMENT = "announcement"
  
  # DEFAULT PERSON/EVENT TYPES
  DEFAULT_PERSON_EMAIL_TYPES = [
      TYPE_EVENT_SUGGESTION,
      TYPE_EVENT_UPDATE,
      TYPE_NEW_ATTENDEE,
      TYPE_WAITING_LOCATION_EVENT,
  ]
  
  
  def delete_event_subscriptions_disabled(apps, schema_editor):
      Subscription = apps.get_model("notifications", "Subscription")
  
      Subscription.objects.filter(
          type=SUBSCRIPTION_EMAIL,
          activity_type__in=DEFAULT_PERSON_EMAIL_TYPES,
          person__event_notifications=False,
      ).delete()
  
  
  def reverse_deletion(apps, schema_editor):
      pass
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("notifications", "0010_migrate_types"),
      ]
  
      operations = [
          migrations.RunPython(
              delete_event_subscriptions_disabled, reverse_deletion, atomic=True,
          ),
      ]
  
subject: remove dependancy to pass tests