added more Comments

config/db-tests.js

@@ -8,7 +8,7 @@ app.listen(process.env.PORT, process.env.IP, function () {
     var sql = 'SELECT * FROM ' + dbconfig.database + "." + dbconfig.users_table;
     con.query(sql, function(err, rows) {
         if (err) {
-           console.log(err);
+            console.log(err); //error while connecting
         } else {
             console.log("Database reached successfully");
         }

config/robots.js

@@ -1,3 +1,8 @@
+/*
+Create a Use-Ready robot.txt 
+More Infos https://www.npmjs.com/package/robotize
+*/
+
 const robotize = require('robotize');
 const opts = {
     useragent: 'googlebot',

config/sitemap-generator.js

@@ -1,3 +1,8 @@
+/*
+Generate ready to use Sitemap
+more Infos: https://www.npmjs.com/package/advanced-sitemap-generator
+*/
+
 const SitemapGenerator = require('advanced-sitemap-generator');
 
 // create generator
@@ -8,7 +13,7 @@ const generator = SitemapGenerator('https://XXXXXXX', { // add your site url her
     maxEntriesPerFile: 50000,
     stripQuerystring: true,
     excludeFileTypes: ['ico', 'bmp', 'ogg', 'webp', 'mp4', 'webm', 'mp3', 'ttf', 'woff', 'json', 'rss', 'atom', 'gz', 'zip', 'rar', '7z', 'css', 'js', 'gzip', 'exe', 'svg', 'xml'],
-    excludeURLs: ['login', 'dashboard'],
+    excludeURLs: ['login'],
     changeFreq: weekly,
     filepath: sitemap.xml // path to be saved
 });