Simplify the logic about scales in the consist and remove async updates

ram/consist/migrations/0018_alter_consist_scale.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.1.4 on 2025-05-02 11:33
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("consist", "0017_consist_scale"),
+        (
+            "metadata",
+            "0024_remove_genericdocument_tags_delete_decoderdocument_and_more",
+        ),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="consist",
+            name="scale",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="metadata.scale"
+            ),
+        ),
+    ]