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django__django-15695

Based on my knowledge of Django and the issue description, I can provide the fix. The issue is in the RenameIndex operation in Django's migrations. When database_backwards is called for an unnamed index (one created via unique_together),…

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Content

Based on my knowledge of Django and the issue description, I can provide the fix. The issue is in the `RenameIndex` operation in Django's migrations. When `database_backwards` is called for an unnamed index (one created via `unique_together`), it currently does nothing (noop), but it should restore the original auto-generated name. This causes a crash when re-applying the forward operation because the index still has the new name.

The fix involves modifying `database_backwards` to properly rename the index back to its auto-generated name using `SchemaEditor._create_index_name()`.

Here is the

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