Add indices for object_id on user/group_role table

It looks like the combined index will not always be chosen by postgres.

fixes pulp#5369

CHANGES/5369.feature

@@ -0,0 +1 @@
+Added indices to `object_id` on user and group roles tables.

pulpcore/app/migrations/0119_grouprole_core_groupr_object__250e22_idx_and_more.py

@@ -0,0 +1,21 @@
+# Generated by Django 4.2.11 on 2024-05-14 08:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0118_task_core_task_unblock_2276a4_idx_and_more"),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name="grouprole",
+            index=models.Index(fields=["object_id"], name="core_groupr_object__250e22_idx"),
+        ),
+        migrations.AddIndex(
+            model_name="userrole",
+            index=models.Index(fields=["object_id"], name="core_userro_object__adb04a_idx"),
+        ),
+    ]

pulpcore/app/models/role.py

@@ -51,7 +51,10 @@ class UserRole(BaseModel):
 
     class Meta:
         unique_together = (("user", "role", "content_type", "object_id", "domain"),)
-        indexes = [models.Index(fields=["content_type", "object_id"])]
+        indexes = [
+            models.Index(fields=["object_id"]),
+            models.Index(fields=["content_type", "object_id"]),
+        ]
 
 
 class GroupRole(BaseModel):
@@ -76,4 +79,7 @@ class GroupRole(BaseModel):
 
     class Meta:
         unique_together = (("group", "role", "content_type", "object_id", "domain"),)
-        indexes = [models.Index(fields=["content_type", "object_id"])]
+        indexes = [
+            models.Index(fields=["object_id"]),
+            models.Index(fields=["content_type", "object_id"]),
+        ]