remaining stage 1

backend/igny8_core/modules/writer/migrations/0012_metadata_mapping_tables.py

@@ -2,6 +2,28 @@ from django.db import migrations, models
 import django.db.models.deletion
 
 
+def backfill_metadata_mappings_stub(apps, schema_editor):
+    """
+    Stage 1: Placeholder for Stage 3 metadata backfill.
+    
+    This function will be extended in Stage 3 to backfill:
+    - ContentClusterMap records from existing Content/Task -> Cluster relationships
+    - ContentTaxonomyMap records from existing taxonomy associations
+    - ContentAttributeMap records from existing attribute data
+    
+    For now, this is a no-op to establish the migration hook.
+    """
+    # Stage 1: No-op - tables created, ready for Stage 3 backfill
+    pass
+
+
+def reverse_backfill_metadata_mappings_stub(apps, schema_editor):
+    """
+    Reverse operation for metadata backfill (no-op for Stage 1).
+    """
+    pass
+
+
 class Migration(migrations.Migration):
 
     dependencies = [
@@ -117,5 +139,10 @@ class Migration(migrations.Migration):
             model_name='contentattributemap',
             index=models.Index(fields=['task', 'name'], name='writer_con_task__name_fa4a4e_idx'),
         ),
+        # Stage 1: Data migration stub for Stage 3 backfill
+        migrations.RunPython(
+            backfill_metadata_mappings_stub,
+            reverse_backfill_metadata_mappings_stub,
+        ),
     ]