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core/files/migrations/0003_ensure_creation_date.py

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+# Generated by Django 4.2.7 on 2024-11-21 22:40
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('files', '0002_alter_file_file'),
+    ]
+
+    def set_creation_date(apps, schema_editor):
+        File = apps.get_model('files', 'File')
+        for file in File.objects.all():
+            if file.created_at is None:
+                if not file.item.created_at is None:
+                    file.created_at = file.item.created_at
+                else:
+                    file.created_at = max(File.objects.filter(id__lt=file.id).values_list('created_at', flat=True))
+
+    operations = [
+        migrations.RunPython(set_creation_date),
+    ]