查询已核销贷款的账外追踪余额

def solve():
    from pyodide.http import open_url
    clients_csv = open_url("https://data.zuihe.com/dbd/credit/state_10/clients.csv").read()
    loans_csv = open_url("https://data.zuihe.com/dbd/credit/state_10/loans.csv").read()
    loan_classifications_csv = open_url("https://data.zuihe.com/dbd/credit/state_10/loan_classifications.csv").read()
    write_offs_csv = open_url("https://data.zuihe.com/dbd/credit/state_10/write_offs.csv").read()
    recovery_records_csv = open_url("https://data.zuihe.com/dbd/credit/state_10/recovery_records.csv").read()
    import sqlite3, pandas as pd
    from io import StringIO
    conn = sqlite3.connect(':memory:')
    pd.read_csv(StringIO(write_offs_csv)).to_sql('write_offs', conn, index=False, if_exists='replace')
    pd.read_csv(StringIO(recovery_records_csv)).to_sql('recovery_records', conn, index=False, if_exists='replace')
    result = pd.read_sql_query("""SELECT w.loan_id, w.write_off_amount,
        COALESCE(SUM(r.recovered_amount),0) as total_recovered,
        w.write_off_amount - COALESCE(SUM(r.recovered_amount),0) as off_balance_amount
    FROM write_offs w LEFT JOIN recovery_records r ON w.loan_id=r.loan_id
    GROUP BY w.loan_id, w.write_off_amount""", conn)
    print(result.to_string(index=False))
    conn.close()