Reproduction for sentry-python#5274

[sl0thentr0py]

Summary

• Reproduction for Django ASGI send_default_pii triggering SynchronousOnlyOperation
• When running Django under ASGI with send_default_pii=True, Sentry's Django integration calls request.user.is_authenticated synchronously in the ASGI event processor
• On Django 5.x this triggers lazy session-backed user resolution in an async context and raises SynchronousOnlyOperation

Issue: getsentry/sentry-python#5274

How to run

cd sentry-python/5274
uv sync
uv run python manage.py migrate
uv run python manage.py createsuperuser --username admin --email admin@example.com
uv run uvicorn asgi:application --host 127.0.0.1 --port 8000

Then:

1. Go to http://127.0.0.1:8000/admin/ and log in
2. Visit http://127.0.0.1:8000/
3. Check the console for SynchronousOnlyOperation error

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