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wire 2026-06-16
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DJANGO FIXES MIGRATION CRASH THAT BREAKS UNIQUE CONSTRAINTS

By RepoJournal · Filed · About Django · Composed from the cited sources · methodology

David-Wobrock
1 person shipped this
David-Wobrock @David-Wobrock 1 cited

A critical bug in Django's migration system is now patched: CreateModel with unique_together no longer crashes when followed by AlterUniqueTogether in the same migration.

The fix [1] resolves a crash that occurred when migrations contained both operations in sequence. Django was attempting to remove a unique constraint that existed only in deferred SQL, causing the alter operation to fail. This is the kind of silent killer that ships to production undetected until you run a specific migration sequence. In parallel, the docs got a significant boost with new guidance on test performance [2]. The team added explicit documentation showing how setUpTestData dramatically speeds up test suites by reusing data across tests, with revised examples that actually demonstrate the isolation mechanics. Secondary fixes landed on password hashing anchor links [3] and the steering council published June meeting notes [4]. ASV benchmarks also updated with ubuntu-latest results [5], keeping the performance baseline current.

$ ls django/reviews/ # the step-back reads

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Quick answers

What shipped in Django on June 16, 2026?
A critical bug in Django's migration system is now patched: CreateModel with unique_together no longer crashes when followed by AlterUniqueTogether in the same migration. In total, 5 commits and 2 pull requests landed.
Who contributed to Django on June 16, 2026?
1 developer shipped this update, including David-Wobrock.
What were the notable Django updates?
Fixed #31317 -- Avoided crash in CreateModel with unique_together and AlterUniqueTogether, Fixed #37128 -- Doc'd setUpTestData as test speed up, and Fixed password hashing anchor link for references.
♥

$ log @django --recent

Ubuntu-latest results land in the Django benchmark suite 1 shipped cached_property deprecation lands, asgiref 3.13.0 ships 13 shipped ThreadSensitiveContext gains nesting, Q.check() escapes logged DB errors 22 shipped Windows CI gets gettext, djangosnippets drops a dead dependency 8 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training GSM8K scoring parses answers as exact decimals AI Red Teaming PyRIT closes a judge-spoofing hole, promptfoo accepts Langfuse v6

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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