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    Before — SQL injection vulnerability
    user_service.py
    1def get_user_data(user_id):
    2 conn = db.connect()
    3 result = conn.query(f"SELECT * FROM users WHERE id={user_id}")
    4 conn.close()
    5 return result
    After — Parameterized query + proper cleanup
    user_service.py
    1def get_user_data(user_id):
    2 conn = db.connect()
    3+ try:
    4+ result = conn.query(
    5+ "SELECT * FROM users WHERE id = %s",
    6+ (user_id,)
    7+ )
    8 return result
    9+ finally:
    10+ conn.close()
    Agent completed investigation
    Fixed SQL injection • Added proper exception handling • PR #2847 ready for review