Remove unused sqlalchemy import in migration file

[Lang-Qiu]

Problem

The migration file alembic/migrations/versions/20250719_1740_26dd25579d9f_remove_overly_restrictive_invitation_.py contained an unused import of sqlalchemy as sa. This can lead to lint warnings, increase code clutter, and reduce readability without affecting functionality.

Solution

Removed the unused import statement import sqlalchemy as sa from the file to clean up the code and adhere to lint best practices.

Verification

• Run lint tools (e.g., flake8, pylint) to confirm no remaining unused import warnings in this file.
• Execute Alembic migration commands (e.g., alembic upgrade head) to ensure the migration still functions correctly.
• Review the codebase to confirm no other dependencies on this import, as it was unused and should not impact any features.

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