Shorcode is not the primary col

migrations/20210812194727_init_db.js

@@ -8,8 +8,7 @@ exports.up = function(knex) {
     table.timestamps();
   })
   .createTable('urls', function(table){
-      table.increments('id');
-      table.string('shortcode', 12);
+      table.string('shortcode').primary();
       table.string('target');
       table.timestamps();
   });