Cannot add a field "discordId" to my user object.

import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";

import { db } from "@/db";
import * as schema from "@/db/schemas/auth-schema";

export const auth = betterAuth({
  database: drizzleAdapter(db, {
    provider: "pg",
    schema: { ...schema },
  }),
  socialProviders: {
    discord: {
      clientId: process.env.DISCORD_CLIENT_ID,
      clientSecret: process.env.DISCORD_CLIENT_SECRET,
      // TODO: Update scopes
      scope: ["identify", "guilds"],
    },
  },
  user: {
    additionalFields: {
      discordId: {
        type: "string",
      },
    },
  },
});

// ...
export const user = pgTable("user", {
  id: text("id").primaryKey(),
  name: text("name").notNull(),
  email: text("email").notNull().unique(),
  emailVerified: boolean("email_verified").default(false).notNull(),
  image: text("image"),
  createdAt: timestamp("created_at")
    .$defaultFn(() => new Date())
    .notNull(),
  updatedAt: timestamp("updated_at")
    .$defaultFn(() => new Date())
    .$onUpdate(() => new Date())
    .notNull(),
  discordId: text("discord_id").unique(),
// ...
});