[#2835] Remove legacy celery tasks

    - Celery tasks with English names are duplicates of tasks with
      Dutch names and are therefore deleted

src/custom_migrations/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class MigrationsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "custom_migrations"

src/custom_migrations/migrations/0001_delete_old_celery_tasks.py

@@ -0,0 +1,32 @@
+# Generated by Django 4.2.16 on 2024-10-23 08:26
+
+from django.db import migrations
+
+
+def delete_old_celery_tasks(apps, _):
+    PeriodicTask = apps.get_model("django_celery_beat", "PeriodicTask")
+
+    legacy_tasks = PeriodicTask.objects.filter(
+        name__in=[
+            "Send emails about messages",
+            "Send emails about expiring plans",
+            "Send emails about expiring actions",
+            "Delete old emails",
+            "Retry emails",
+            "Rebuild search index",
+            "Import ZGW data",
+        ]
+    )
+    legacy_tasks.delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [("django_celery_beat", "0018_improve_crontab_helptext")]
+
+    operations = [
+        migrations.RunPython(
+            code=delete_old_celery_tasks,
+            reverse_code=migrations.RunPython.noop,
+        )
+    ]

src/open_inwoner/conf/base.py

@@ -204,6 +204,7 @@
     "django_setup_configuration",
     "django_yubin",
     "notifications",
+    "custom_migrations",
     # Project applications.
     "open_inwoner.components",
     "open_inwoner.kvk",