def serialize_activity(row) -> dict:
    return {
        "id": str(row.id),
        "inbox_id": row.inbox_id,
        "activity_type": row.activity_type,
        "activity_date": row.activity_date.isoformat() if row.activity_date else None,
        "activity_time": row.activity_time.isoformat() if row.activity_time else None,
        "activity_status": row.activity_status,
        "description": row.description,
    }