Fix silent deserialization failure with unique together constraint#313

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ozer550 wants to merge 4 commits intolearningequality:release-v0.8.xfrom

ozer550:fix-silent-deserialization-failure-with-unique-together-constraint

Commits on Apr 1, 2026

add regression tests to verify unique-constraint setup fails silently
ozer550
committed

Commits on Apr 2, 2026

converge per record save logic for both self-referential and non self-referential branch
ozer550
committed
try locally importing transaction to fix test failures
ozer550
committed

Commits on Apr 6, 2026

bring back important comments
ozer550
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