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django__django-12708

Based on my knowledge of the Django codebase and this specific issue, I can provide the fix. The issue is in django/db/backends/base/schema.py in the _delete_composed_index method. When deleting an index_together, the method uses…

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Based on my knowledge of the Django codebase and this specific issue, I can provide the fix. The issue is in `django/db/backends/base/schema.py` in the `_delete_composed_index` method. When deleting an `index_together`, the method uses `_constraint_names` to find constraints, but it doesn't properly filter to only find non-unique indexes. When both `index_together` and `unique_together` exist on the same fields, it finds both constraints and fails.

The fix is to pass `index=True` to the `_constraint_names` call in `_delete_composed_index` when deleting an index (not a unique constraint), whic

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