diff --git a/schedule/migrations/0015_rename_calendarrelation_content_type_object_id_schedule_ca_content_cddadb_idx_and_more.py b/schedule/migrations/0015_rename_calendarrelation_content_type_object_id_schedule_ca_content_cddadb_idx_and_more.py
new file mode 100644
index 00000000..01cadc18
--- /dev/null
+++ b/schedule/migrations/0015_rename_calendarrelation_content_type_object_id_schedule_ca_content_cddadb_idx_and_more.py
@@ -0,0 +1,32 @@
+# Generated by Django 4.1 on 2023-10-17 11:20
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("schedule", "0014_use_autofields_for_pk"),
+    ]
+
+    operations = [
+        migrations.RenameIndex(
+            model_name="calendarrelation",
+            new_name="schedule_ca_content_cddadb_idx",
+            old_fields=("content_type", "object_id"),
+        ),
+        migrations.RenameIndex(
+            model_name="event",
+            new_name="schedule_ev_start_a258cb_idx",
+            old_fields=("start", "end"),
+        ),
+        migrations.RenameIndex(
+            model_name="eventrelation",
+            new_name="schedule_ev_content_6ceecb_idx",
+            old_fields=("content_type", "object_id"),
+        ),
+        migrations.RenameIndex(
+            model_name="occurrence",
+            new_name="schedule_oc_start_76a2f8_idx",
+            old_fields=("start", "end"),
+        ),
+    ]
diff --git a/schedule/models/calendars.py b/schedule/models/calendars.py
index 81f8a7de..91b417d0 100644
--- a/schedule/models/calendars.py
+++ b/schedule/models/calendars.py
@@ -231,7 +231,9 @@ class CalendarRelation(models.Model):
     class Meta:
         verbose_name = _("calendar relation")
         verbose_name_plural = _("calendar relations")
-        index_together = [("content_type", "object_id")]
+        indexes = [
+            models.Index(fields=["content_type", "object_id"]),
+        ]
 
     def __str__(self):
         return "{} - {}".format(self.calendar, self.content_object)
diff --git a/schedule/models/events.py b/schedule/models/events.py
index bf6fa5f1..6f9f9029 100644
--- a/schedule/models/events.py
+++ b/schedule/models/events.py
@@ -92,7 +92,9 @@ class Event(models.Model):
     class Meta:
         verbose_name = _("event")
         verbose_name_plural = _("events")
-        index_together = (("start", "end"),)
+        indexes = [
+            models.Index(fields=["start", "end"]),
+        ]
 
     def __str__(self):
         return gettext("%(title)s: %(start)s - %(end)s") % {
@@ -571,7 +573,9 @@ class EventRelation(models.Model):
     class Meta:
         verbose_name = _("event relation")
         verbose_name_plural = _("event relations")
-        index_together = [("content_type", "object_id")]
+        indexes = [
+            models.Index(fields=["content_type", "object_id"])
+        ]
 
     def __str__(self):
         return "{}({})-{}".format(
@@ -594,7 +598,9 @@ class Occurrence(models.Model):
     class Meta:
         verbose_name = _("occurrence")
         verbose_name_plural = _("occurrences")
-        index_together = (("start", "end"),)
+        indexes = [
+            models.Index(fields=["start", "end"])
+        ]
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
diff --git a/tests/settings.py b/tests/settings.py
index 25b7ba12..4a887966 100644
--- a/tests/settings.py
+++ b/tests/settings.py
@@ -59,8 +59,6 @@
 
 USE_I18N = True
 
-USE_L10N = True
-
 USE_TZ = True
 
 PASSWORD_HASHERS = ["django.contrib.auth.hashers.SHA1PasswordHasher"]