better documentation

backend/src/db.js

@@ -23,9 +23,9 @@ const migrations = [
       await conn.query(`
         CREATE TABLE users (
           id INT PRIMARY KEY AUTO_INCREMENT,
-          username VARCHAR(32) NOT NULL UNIQUE
+          username VARCHAR(64) NOT NULL UNIQUE
         )
-      `);
+      `); // max length is double the actual max length cause of unicode stuff
 
       await conn.query(`
         CREATE TABLE games (