removed useless db constraints

Author: hamidrezarj

database/migrations/create_users_table.php.stub

@@ -12,8 +12,8 @@ return new class extends Migration
             $table->id();
             $table->string('name');
             $table->integer('age');
-            $table->string('username')->unique();
-            $table->string('email')->unique();
+            $table->string('username');
+            $table->string('email');
             $table->timestamps();
         });
     }