Add a maintenance notification kind and make it of the level warning.

initdb.py

@@ -2,8 +2,10 @@ import logging
 import json
 import hashlib
 import random
+import calendar
 
 from datetime import datetime, timedelta
+from email.utils import formatdate
 from peewee import (SqliteDatabase, create_model_tables, drop_model_tables,
                     savepoint_sqlite)
 
@@ -232,6 +234,7 @@ def initialize_database():
   NotificationKind.create(name='password_required')
   NotificationKind.create(name='over_private_usage')
   NotificationKind.create(name='expiring_license')
+  NotificationKind.create(name='maintenance')
 
   NotificationKind.create(name='test_notification')
 
@@ -289,6 +292,16 @@ def populate_database():
 
   model.create_notification('test_notification', new_user_1, metadata={'some': 'value'})
 
+  from_date = datetime.utcnow()
+  to_date = from_date + timedelta(hours=1)
+  notification_metadata = {
+    'from_date': formatdate(calendar.timegm(from_date.utctimetuple())),
+    'to_date': formatdate(calendar.timegm(to_date.utctimetuple())),
+    'reason': 'database migration'
+  }
+  model.create_notification('maintenance', new_user_1, metadata=notification_metadata)
+
+
   __generate_repository(new_user_4, 'randomrepo', 'Random repo repository.', False,
                         [], (4, [], ['latest', 'prod']))