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backend/migrations/0006_migrate_legacy_fields.py

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+from django.db import migrations
+
+def migrate_legacy_fields(apps, schema_editor):
+    Content = apps.get_model('igny8_core', 'Content')
+    Task = apps.get_model('igny8_core', 'Task')
+
+    # Migrate legacy fields in Content model
+    for content in Content.objects.all():
+        if content.categories:
+            # Convert JSON categories to ContentTaxonomy
+            categories = content.categories
+            for category in categories:
+                taxonomy, created = ContentTaxonomy.objects.get_or_create(
+                    name=category['name'],
+                    slug=category['slug'],
+                    taxonomy_type='category'
+                )
+                content.taxonomies.add(taxonomy)
+
+        if content.tags:
+            # Convert JSON tags to ContentTaxonomy
+            tags = content.tags
+            for tag in tags:
+                taxonomy, created = ContentTaxonomy.objects.get_or_create(
+                    name=tag['name'],
+                    slug=tag['slug'],
+                    taxonomy_type='tag'
+                )
+                content.taxonomies.add(taxonomy)
+
+        content.save()
+
+    # Migrate legacy fields in Task model
+    for task in Task.objects.all():
+        task.entity_type = task.content.entity_type
+        task.cluster_role = task.content.cluster_role
+        task.cluster_id = task.content.cluster_id
+        task.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('igny8_core', '0005_phase3_mark_deprecated_fields'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_legacy_fields),
+    ]