settings: Add constant for demo org deadlines.

We set the 30 days deadline timedelta for demo orgs as a constant
in default_settings.py so that it can be overridden in tests.

zerver/lib/actions.py

@@ -4964,7 +4964,7 @@ def do_create_realm(
         realm = Realm(string_id=string_id, name=name, **kwargs)
         if is_demo_organization:
             realm.demo_organization_scheduled_deletion_date = (
-                realm.date_created + datetime.timedelta(days=30)
+                realm.date_created + datetime.timedelta(days=settings.DEMO_ORG_DEADLINE_DAYS)
             )
         realm.save()
 

zerver/tests/test_signup.py

@@ -5180,7 +5180,9 @@ class UserSignUpTest(InviteUserBase):
         assert user_profile is not None
         self.assert_logged_in_user_id(user_profile.id)
 
-        expected_deletion_date = realm.date_created + datetime.timedelta(days=30)
+        expected_deletion_date = realm.date_created + datetime.timedelta(
+            days=settings.DEMO_ORG_DEADLINE_DAYS
+        )
         self.assertEqual(realm.demo_organization_scheduled_deletion_date, expected_deletion_date)
 
 

zproject/default_settings.py

@@ -266,6 +266,9 @@ OPEN_REALM_CREATION = False
 # purpose now that the REALMS_HAVE_SUBDOMAINS migration is finished.
 SYSTEM_ONLY_REALMS = {"zulip"}
 
+# Default deadline for demo organizations
+DEMO_ORG_DEADLINE_DAYS = 30
+
 # Alternate hostnames to serve particular realms on, in addition to
 # their usual subdomains.  Keys are realm string_ids (aka subdomains),
 # and values are alternate hosts.