我在哪里生成了报告的歧义，我如何解决它？

import sqlite3

def update_data(conn, data):
    try:
        with conn:
            conn.execute("BEGIN TRANSACTION")
            for item in data:
                conn.execute("UPDATE table_name SET column = ? WHERE id = ?", (item['value'], item['id']))
            conn.execute("COMMIT")
    except sqlite3.Error as e:
        print(f"Transaction failed: {e}")
        conn.execute("ROLLBACK")

import pandas as pd

def format_report(data):
    df = pd.DataFrame(data)
    df['date'] = pd.to_datetime(df['date']).dt.strftime('%Y-%m-%d')
    return df.to_html(index=False)

def generate_report(data):
    if not data:
        return "No data available"
    
    total = sum(item['value'] for item in data)
    average = total / len(data) if data else 0
    
    report = {
        'total': total,
        'average': average,
        'details': data
    }
    return report