feat: Re-compute the given items cost job.

feat: Optimize the architecture.

server/src/database/objection.js

@@ -1,7 +1,8 @@
 import { Model } from 'objection';
-import knex from '@/database/knex';
 
 // Bind all Models to a knex instance. If you only have one database in
 // your server this is all you have to do. For multi database systems, see
 // the Model.bindKnex() method.
-Model.knex(knex);
+export default ({ knex }) => {
+  Model.knex(knex);
+};