feat: Enhance backend with request/SQL logging via morgan/winston and fix frontend by correctly rendering email Markdown content using the 'marked' library.

backend/db.js

@@ -1,4 +1,5 @@
 const mysql = require('mysql2');
+const logger = require('./logger');
 
 const pool = mysql.createPool({
   host: process.env.DB_HOST,
@@ -10,4 +11,18 @@ const pool = mysql.createPool({
   queueLimit: 0
 });
 
-module.exports = pool.promise();
+const promisePool = pool.promise();
+
+const originalExecute = promisePool.execute;
+promisePool.execute = function(sql, params) {
+  logger.info('Executing SQL', { sql, params });
+  return originalExecute.call(this, sql, params);
+};
+
+const originalQuery = promisePool.query;
+promisePool.query = function(sql, params) {
+  logger.info('Executing SQL', { sql, params });
+  return originalQuery.call(this, sql, params);
+};
+
+module.exports = promisePool;