Make chat faster

judge/migrations/0166_display_rank_index.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.2.18 on 2023-08-28 01:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("judge", "0165_drop_output_prefix_override"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="profile",
+            name="display_rank",
+            field=models.CharField(
+                choices=[
+                    ("user", "Normal User"),
+                    ("setter", "Problem Setter"),
+                    ("admin", "Admin"),
+                ],
+                db_index=True,
+                default="user",
+                max_length=10,
+                verbose_name="display rank",
+            ),
+        ),
+    ]

judge/models/profile.py

@@ -183,6 +183,7 @@ class Profile(models.Model):
             ("setter", "Problem Setter"),
             ("admin", "Admin"),
         ),
+        db_index=True,
     )
     mute = models.BooleanField(
         verbose_name=_("comment mute"),