实现放款操作验证更新状态生成流水

def solve():
    from pyodide.http import open_url
    loan_products_csv = open_url(____).read()
    clients_csv = open_url(____).read()
    loans_csv = open_url(____).read()
    loan_repayment_schedule_csv = open_url(____).read()
    import sqlite3, pandas as pd
    from io import StringIO
    conn = sqlite3.connect(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    loan = pd.read_sql_query(____).iloc[____]
    print(____)
    print(____)
    print(____)
    ref_no = f"____"
    print(____)
    print(____)
    conn.close()