Verifies alembic upgrade 0001 adds users.default_workspace_id (with FK
to workspaces) and that downgrade cleanly removes it. Runs on both
dialects because the migration uses op.batch_alter_table for SQLite
ALTER compatibility.
Tests are intentionally sync — alembic's command layer is sync and
env.py calls asyncio.run(); running under pytest-anyio would deadlock
on the inner event loop.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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