feat(operations): worker concurrency and job retention settings

appsettings/tests/test_appsettings.py

@@ -1,3 +1,4 @@
+from django.contrib.messages import get_messages
 from django.test import RequestFactory, TestCase
 from django.urls import reverse
 
@@ -48,3 +49,8 @@ class AppSettingsTestCase(TestCase):
         # a clone stays on the host of the VM it was made from; the setting
         # that sent it to a random host is removed by migration 0015
         self.assertFalse(AppSettings.objects.filter(key="CLONE_INSTANCE_AUTO_MIGRATE").exists())
+
+    def test_worker_settings_refuse_values_out_of_bounds(self):
+        response = self.client.post(reverse("appsettings"), {"WORKER_CONCURRENCY": "0"})
+        self.assertEqual(AppSettings.objects.get(key="WORKER_CONCURRENCY").value, "4")
+        self.assertTrue(any("between 1 and 16" in str(m) for m in get_messages(response.wsgi_request)))

appsettings/tests/test_migrations.py

@@ -51,3 +51,13 @@ class SnapshotFreeSpaceSettingsTestCase(TestCase):
                 limit = AppSettings._meta.get_field(field).max_length
                 if limit:
                     self.assertLessEqual(len(getattr(setting, field)), limit, f"{key} {field}")
+
+
+class WorkerSettingsTestCase(TestCase):
+    def test_the_rows_fit_their_columns(self):
+        for key in ("WORKER_CONCURRENCY", "JOB_RETENTION_DAYS"):
+            setting = AppSettings.objects.get(key=key)
+            for field in ("name", "key", "value", "description"):
+                limit = AppSettings._meta.get_field(field).max_length
+                if limit:
+                    self.assertLessEqual(len(getattr(setting, field)), limit, f"{key} {field}")