new to drizzle, need help with relations

// Example model schema from the Drizzle docs
// https://orm.drizzle.team/docs/sql-schema-declaration

import { create } from "domain";
import { sql, relations } from "drizzle-orm";
import {
  index,
  pgEnum,
  pgTableCreator,
  primaryKey,
  serial,
  timestamp,
  varchar,
} from "drizzle-orm/pg-core";

/**
 * This is an example of how to use the multi-project schema feature of Drizzle ORM. Use the same
 * database instance for multiple projects.
 *
 * @see https://orm.drizzle.team/docs/goodies#multi-project-schema
 */
export const createTable = pgTableCreator((name) => `loggy_${name}`);

export const users = createTable("users", {
  id: varchar("id").primaryKey(),
  username: varchar("username", { length: 255 }).notNull(),
});

export const usersRelations = relations(users, ({ many }) => ({
  usersToGuilds: many(usersToGuilds),
}));

export const guilds = createTable("guilds", {
  id: varchar("id").primaryKey(),
  name: varchar("name", { length: 255 }).notNull(),
});

export const usersToGuilds = createTable(
  "users_to_guilds",
  {
    userId: varchar("user_id")
      .notNull()
      .references(() => users.id),
    guildId: varchar("guild_id")
      .notNull()
      .references(() => guilds.id),
  },
  (t) => ({
    pk: primaryKey({ columns: [t.userId, t.guildId] }),
  }),
);

export const guildsRelations = relations(guilds, ({ many }) => ({
  usersToGuilds: many(usersToGuilds),
}));

export const messages = createTable("messages", {
  id: varchar("id").primaryKey(),
  content: varchar("content", { length: 4000 }).notNull(),
  user_id: varchar("user_id", { length: 255 })
    .notNull()
    .references(() => users.id, { onDelete: "cascade" }),
  guild_id: varchar("guild_id", { length: 255 })
    .notNull()
    .references(() => guilds.id, { onDelete: "cascade" }),
});

export const messagesRelations = relations(messages, ({ one }) => ({
  user: one(users),
  guild: one(guilds),
}));