Exercise 3: Applied Proactively, Not Rediscovered — Possible Solution
====================================================================

CONFIRMING CHAPTER 2'S OWN db.js
------------------------------
// db.js
const pool = mysql.createPool({
  uri: process.env.DATABASE_URL,
  charset: 'utf8mb4',
});

The charset: 'utf8mb4' option is present in this file exactly as
written back in Chapter 2 - no change was needed here in Chapter 7 at
all.

WHY IT WAS APPLIED PROACTIVELY HERE
------------------------------
Per this chapter, the Astro rebuild's own Chapter 7 discovered that
mysql2 has no automatic utf8mb4 default the way Rails 5.2+'s own
generator provides, and had to add the option mid-course once the
gap became relevant. This course, written after that finding already
existed in the series, applied the identical lesson from the very
first line of its own database connection code, rather than waiting
to discover the same gap independently. The series' own earlier
findings directly informed a later course's own starting decisions.

WHY THIS WORKS AS AN ANSWER
------------------------------
It correctly confirms the charset option was present since Chapter 2
with no change needed here, and correctly explains that this reflects
the series' own accumulated knowledge being applied in advance rather
than the same gap being rediscovered a second time.