chore: remove unused event import from database/models.py

[devin-ai-integration]

chore: remove unused event import from database/models.py

Summary

Removes the unused from sqlalchemy import event import on line 12 of database/models.py. The event module is never referenced anywhere in the codebase — no event.listen(), @event.listens_for(), or any other event registration calls exist. It was a speculative import from initial code generation.

Review & Testing Checklist for Human

• Confirm no dynamic or string-based references to event exist in the codebase (e.g., getattr(sqlalchemy, 'event'))
• Verify the app starts and models load correctly after removal

Notes

• Candidate ID: cee3deb54174
• Link to Devin Session
• Requested by: bot_apk

[devin-ai-integration]

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