Cannot add custom field to User interface in SvelteKit project with PostgreSQL Adapter

[PiquelChips]

Hello, I am trying to add a username field that gets added to the database with everything else (email, name, ...). I have tried doing this by extending the User interface and overriding the profile callback in providers.

Here is my app.d.ts file (I have made sure that this file is being detected and is not the problem)

import type { DefaultSession } from "@auth/sveltekit";

declare module "pg" {}
/// <reference types="@auth/sveltekit" />

declare module "@auth/sveltekit" {
	interface User {
		username?: string | null;
	}
	interface Session {
		user: {
			username?: string | null;
		} & DefaultSession["user"];
	}

	interface Profile {
		username?: string | null;
	}
}

And here is my hooks.server.ts file

import { SvelteKitAuth, type User } from "@auth/sveltekit";
import PostgresAdapter from "@auth/pg-adapter";
import pg from "pg";
import GitHub from "@auth/sveltekit/providers/github";
import Google from "@auth/sveltekit/providers/google";

const pool = new pg.Pool({
    host: process.env.DATABASE_HOST,
    user: process.env.DATABASE_USER,
    password: process.env.DATABASE_PASSWORD,
    database: process.env.DATABASE_NAME,
    max: 20,
    idleTimeoutMillis: 30000,
    connectionTimeoutMillis: 2000,
})

export const { handle } = SvelteKitAuth({
    providers: [
        GitHub({
            allowDangerousEmailAccountLinking: true,
            profile(profile) {
                return {
                    id: profile.id,
                    name: profile.name,
                    image: profile.avatar_url,
                    email: profile.email,
                    username: profile.login?.toString().toLowerCase(),
                };
            },
        }),
        Google({
            allowDangerousEmailAccountLinking: true,
            profile(profile) {
                return {
                    id: profile.id,
                    name: profile.name,
                    image: profile.picture,
                    email: profile.email,
                    username: profile.name?.toString().replace(" ", "-").toLowerCase(),
                };
            },
        }),
    ],
    callbacks: {
        async session({ session, user }) {
            session.user.username = user.username;
            return session;
        },
    },
    pages: {
        signIn: "/login",
        signOut: "/logout",
        //error: "/error",
        //newUser: "/new-user",
    },
    adapter: PostgresAdapter(pool),
    trustHost: true,
})

My database does indeed have the corresponding field with the right name in the right table

I have scoured the internet but not found the solution to my problem. I would be happy to give more information if needed. Thank you for your help.