disnake (discord.py works also.. or not, depends) postgreSQL setprefix command

Question

i'm currently hardstuck in a maybe easy situation... my !setprefix<prefix> won't do anything. it's just empt. When i insert a print(DEFAULT_PREFIX) in any of this code, it will print the set default of "!". Even in my postgreSQL db, the default is set to "!". (rechecked with deleting and restarting everything) I bet it has something to do with my bot.db which is set in main.py.

my main.py

*
from cogs.prefix import getprefix



async def create_db_pool():
    bot.db = await asyncpg.create_pool(database="**", user="**", password="**")
    print("Database connected succesfully") #placeholder, is set correctly in my code


bot = commands.Bot(command_prefix=getprefix, help_command=None, intents=intents,
                   activity=activity, status=disnake.Status.idle)


* 

bot.loop.run_until_complete(create_db_pool())
bot.run(TOKEN)

my prefix.py (as cog)

from disnake.ext import commands

DEFAULT_PREFIX = '!'


async def getprefix(ctx, message):
    if not message.guild:
        return commands.when_mentioned_or(DEFAULT_PREFIX)(ctx, message)

    prefix = await ctx.db.fetch('SELECT prefix FROM prefixes WHERE guild_id = $1', message.guild.id)
    if len(prefix) == 0:
        await ctx.db.execute('INSERT INTO prefixes(guild_id, prefix) VALUES ($1, $2)', message.guild.id, DEFAULT_PREFIX)
        prefix = DEFAULT_PREFIX
    else:
        prefix = prefix[0].get("prefix")
    return commands.when_mentioned_or(prefix)(ctx, message)


class Prefix(commands.Cog):

    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    @commands.has_permissions(administrator=True)
    async def setprefix(ctx, newprefix):
        await ctx.db.execute('UPDATE prefixes SET prefix = $1 WHERE guild_id = $2', newprefix, ctx.guild.id)
        await ctx.send("Updated to prefix by!")

    @setprefix.error
    async def setprefix_error(self, ctx, error):
        if isinstance(error, commands.MissingPermissions):
            await ctx.send("You can't do that!")


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

Answer 1

So, after a long debugging run i finally got my problem. It was due my getprefix() function could not resolve bot.db and just importing leads to other problems.

So i simply moved the whole getprefix() function into main.py and changed in prefix.py ctx.db.execute(*) into self.bot.db.execute(*) and voila, it works. That costs me a lot of headache and was the thing that i had to be pointed out. Maaybe this will help any other guy stucked at this point where organizing gone wrong.