fix(accounts): knox creates no table of its own

knox's first migration creates its AuthToken table even when
KNOX_TOKEN_MODEL replaces it with accounts.ApiToken. The unused
knox_authtoken table references auth_user, and Django, which does not see
it, does not empty it with the others: on PostgreSQL every test that
empties the database failed ("cannot truncate a table referenced in a
foreign key constraint"). SQLite does not check this, so only CI's
PostgreSQL leg showed it. knox stays installed for its token code, with
its migrations turned off (MIGRATION_MODULES).

accounts/tests/test_api_tokens.py

@@ -6,6 +6,7 @@ from datetime import timedelta
 
 from accounts.models import ApiToken
 from django.contrib.auth import get_user_model
+from django.db import connection
 from django.test import TestCase
 from django.urls import reverse
 from django.utils import timezone
@@ -91,3 +92,9 @@ class ApiTokenTests(TestCase):
         response = self.client.post(reverse("accounts:api_token_create"), {"name": " ", "days": "30"})
         self.assertFalse(ApiToken.objects.exists())
         self.assertNotRegex(response.content.decode(), r"wvc_[0-9a-f]{64}")
+
+    def test_knox_makes_no_table_of_its_own(self):
+        # accounts.ApiToken replaces knox's AuthToken; a knox_authtoken table
+        # would reference auth_user unseen, and PostgreSQL could not empty
+        # auth_user between tests
+        self.assertNotIn("knox_authtoken", connection.introspection.table_names())

webvirtcloud/settings.py.template

@@ -381,6 +381,9 @@ REST_FRAMEWORK = {
 # "Authorization: Token wvc_..."; made and deleted on the profile page
 KNOX_TOKEN_MODEL = "accounts.ApiToken"
 REST_KNOX = {"TOKEN_PREFIX": "wvc_"}
+# knox stays installed for its token code, but its migrations would create a
+# knox_authtoken table that accounts.ApiToken replaces
+MIGRATION_MODULES = {"knox": None}
 
 SPECTACULAR_SETTINGS = {
     "TITLE": "Webvirtcloud REST-API",