Fixed #36168: Handled backward migration in multi squashed migration app #19623
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Trac ticket number
ticket-36168
Branch description
This PR fixes Django ticket #36168, which causes backward migrations to break when using squashed migrations across multiple apps. I’ve written an article explaining how the issue was identified and how the proposed logic resolves it:
https://dev.to/houston_wong_78b96dd3a773/fixing-django-squashed-migration-in-multi-app-issue-36168-5g39
A minimal reproduction and debugging project is also available here:
https://github.com/houston0222/django-debug-36168
Checklist
main
branch.