Fix db migration for mobile app (#3260)

# What this PR does
Fixes bd migration

## Which issue(s) this PR fixes
Closes https://github.com/grafana/oncall/issues/3222

## Checklist

- [ ] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+- Fix db migration for mobile app @Ferril ([#3260](https://github.com/grafana/oncall/pull/3260))
+
 ## v1.3.52 (2023-11-02)
 
 ### Fixed

engine/apps/mobile_app/migrations/0011_alter_mobileappusersettings_going_oncall_notification_timing.py

@@ -4,13 +4,6 @@ import apps.mobile_app.models
 import django_migration_linter as linter
 
 from django.db import migrations, models
-from apps.mobile_app.models import default_notification_timing_options
-
-
-def set_going_oncall_notification_timing_to_default(apps, schema_editor):
-    MobileAppUserSettings = apps.get_model("mobile_app", "MobileAppUserSettings")
-    default = default_notification_timing_options()
-    MobileAppUserSettings.objects.all().update(going_oncall_notification_timing=default)
 
 
 class Migration(migrations.Migration):
@@ -21,10 +14,13 @@ class Migration(migrations.Migration):
 
     operations = [
         linter.IgnoreMigration(),
-        migrations.AlterField(
+        migrations.RemoveField(
+            model_name='mobileappusersettings',
+            name='going_oncall_notification_timing',
+        ),
+        migrations.AddField(
             model_name='mobileappusersettings',
             name='going_oncall_notification_timing',
             field=models.JSONField(default=apps.mobile_app.models.default_notification_timing_options),
         ),
-        migrations.RunPython(set_going_oncall_notification_timing_to_default, migrations.RunPython.noop),
     ]