[pull] master from django-tenants:master - #83
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The multiprocessing executor's workers import the Postgres backend and
touch the Django app registry, which only works if the worker inherits
the parent's already-populated registry — i.e. the fork start method.
The pool previously relied on Python's implicit default start method.
Python 3.14 now warns when implicitly forking from a multi-threaded
parent and a future Python will change the default away from fork, which
would silently break this executor even on Linux.
Request a fork context explicitly where the platform supports it (Linux),
falling back to the default context elsewhere (e.g. Windows, which has no
fork). get_context('fork') returns a local context and does not mutate
the global default start method.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…utor-fork Use fork start method in multiprocessing migration executor
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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