数据库行删除与Discord.py集成不删除

import discord
import sqlite3

client = discord.Client()

def delete_user_from_db(user_id):
    conn = sqlite3.connect('database.db')
    cursor = conn.cursor()
    try:
        cursor.execute("DELETE FROM users WHERE user_id = ?", (user_id,))
        conn.commit()
    except sqlite3.Error as e:
        print(f"Database error: {e}")
    finally:
        conn.close()

@client.event
async def on_ready():
    print(f'Logged in as {client.user}')

@client.event
async def on_message(message):
    if message.content.startswith('$delete'):
        user_id = message.author.id
        delete_user_from_db(user_id)
        await message.channel.send(f"User {user_id} has been deleted from the database.")

client.run('YOUR_DISCORD_BOT_TOKEN')