feat(src/notifications): add indexes for deadline reminder and notification models

Prevent missing indexes that slow queries on ticket/user and user/created_at fields.

src/notifications/migrations/0002_deadlinereminderlog_deadline_re_ticket__850437_idx_and_more.py

@@ -0,0 +1,27 @@
+# Generated by Django 6.0.6 on 2026-06-28 10:14
+
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("notifications", "0001_initial"),
+        ("tickets", "0002_ticketcomment_ticket_comm_ticket__5ef05d_idx_and_more"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name="deadlinereminderlog",
+            index=models.Index(
+                fields=["ticket", "user"], name="deadline_re_ticket__850437_idx"
+            ),
+        ),
+        migrations.AddIndex(
+            model_name="notification",
+            index=models.Index(
+                fields=["user", "created_at"], name="notificatio_user_id_7336fd_idx"
+            ),
+        ),
+    ]

src/notifications/models.py

@@ -24,6 +24,7 @@ class Notification(models.Model):
         verbose_name_plural = "Notifications"
         indexes = [
             models.Index(fields=["user", "read_at"]),
+            models.Index(fields=["user", "created_at"]),
         ]
         ordering = ("-created_at",)
 
@@ -51,6 +52,9 @@ class DeadlineReminderLog(models.Model):
         db_table = "deadline_reminder_log"
         verbose_name = "Deadline Reminder Log"
         verbose_name_plural = "Deadline Reminder Logs"
+        indexes = [
+            models.Index(fields=["ticket", "user"]),
+        ]
         constraints = [
             models.UniqueConstraint(
                 fields=["ticket", "user", "days_before"],