backend/code_review_backend/issues/migrations/0006_issuelink_initial.py [62:68]:
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                name="issue_link_unique_revision",
            ),
        ),
        migrations.AddConstraint(
            model_name="issuelink",
            constraint=models.UniqueConstraint(
                condition=models.Q(("diff__isnull", False)),
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backend/code_review_backend/issues/migrations/0013_move_issues_attributes_part_2.py [72:78]:
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                name="issue_link_unique_revision",
            ),
        ),
        migrations.AddConstraint(
            model_name="issuelink",
            constraint=models.UniqueConstraint(
                condition=models.Q(("diff__isnull", False)),
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