Exercise 1: Enabling the Relational Query API — Possible Solution
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// db/client.ts
import { drizzle } from 'drizzle-orm/mysql2';
import mysql from 'mysql2/promise';
import * as schema from './schema';

const connection = await mysql.createConnection(process.env.DATABASE_URL);
export const db = drizzle(connection, { schema });

WHY PASSING schema MATTERS
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Per this chapter, drizzle() only exposes the db.query.<table> relational
API when it's given the full schema module, including the
pagesRelations definition from Chapter 2 - without that second
argument, only the plain db.select()/db.insert() query builder used
in earlier chapters is available, with no db.query object at all.

CONFIRMATION
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After this change, db.query.pages exists and accepts a with option,
where previously it would have been undefined.

WHY THIS WORKS AS AN ANSWER
------------------------------
It correctly shows schema being passed as the second argument to
drizzle(), and correctly explains why that specific argument is what
unlocks the relational query API this chapter depends on.