Add the server ID and default prefix to the database - discord.py rewrite, PostgreSQL?

Question

Python

And an owl good day to all <з !!!
There is such a code, when the bot enters the server, the server ID and the default prefix should be entered in the database.

import discord
from discord.ext import commands
import os
import asyncpg, asyncio

PREFIX=str('.')


class prefix(commands.Cog):
    def __init__(self,bot):
        self.bot = bot

    @commands.Cog.listener()
    async def on_guild_join(self, guild):
        guildid= str(guild.id)
        await self.bot.execute(f'INSERN INTO prefixDB (guild_id, prefix) VALUES ({guildid},{PREFIX})')

    @commands.Cog.listener()
    async def on_guild_remove(self):
        pass

    @commands.command()
    @commands.has_permissions(administrator=True)
    async def prefix(self, ctx, prefix):
        pass

def setup(bot):
    bot.add_cog(prefix(bot))

But it's not the task that gives the following error:


On Heroku, here:

Answer 1

await self.bot.execute(f'INSERN INTO prefixDB (guild_id, prefix) VALUES ({guildid},{PREFIX})')

1) the request is wrong - replace INSERN with INSERT
2) try replacing bot with cursor