Add scheduled_for in the post notification request form.

Return scheduled for in get_notification requests.

app/notifications/process_notifications.py

@@ -10,8 +10,10 @@ from notifications_utils.recipients import (
 from app import redis_store
 from app.celery import provider_tasks
 from notifications_utils.clients import redis
-from app.dao.notifications_dao import dao_create_notification, dao_delete_notifications_and_history_by_id
-from app.models import SMS_TYPE, Notification, KEY_TYPE_TEST, EMAIL_TYPE
+from app.dao.notifications_dao import (dao_create_notification,
+                                       dao_delete_notifications_and_history_by_id,
+                                       dao_created_scheduled_notification)
+from app.models import SMS_TYPE, Notification, KEY_TYPE_TEST, EMAIL_TYPE, ScheduledNotification
 from app.v2.errors import BadRequestError, SendNotificationToQueueError
 from app.utils import get_template_instance, cache_key_for_service_template_counter
 
@@ -120,3 +122,9 @@ def simulated_recipient(to_address, notification_type):
         return to_address in formatted_simulated_numbers
     else:
         return to_address in current_app.config['SIMULATED_EMAIL_ADDRESSES']
+
+
+def persist_scheduled_notification(notification_id, scheduled_for):
+    scheduled_notification = ScheduledNotification(notification_id=notification_id,
+                                                   scheduled_for=scheduled_for)
+    dao_created_scheduled_notification(scheduled_notification)