stage 1

src/routes/healthRoutes.js

@@ -8,6 +8,11 @@ const router = Router();
 router.get(
   '/',
   asyncHandler(async (_req, res) => {
+    /*
+     * The health endpoint checks the database on purpose instead of only proving
+     * that Express can answer HTTP. In this project, the server is not useful if
+     * MariaDB is unavailable, so health must include that dependency.
+     */
     await query('SELECT 1 AS ok');
 
     res.json({