Revert "Remove default margin route as it is replaced with preferences"

This reverts commit fb5667f.

src/app.js

@@ -8,6 +8,7 @@ import logger from './logger.js';
 import admin_auth from './routes/admin/adminAuth.js';
 import admin_boxes from './routes/admin/boxes.js';
 import admin_categories from './routes/admin/categories.js';
+import admin_default_margin from './routes/admin/default_margin.js';
 import admin_history from './routes/admin/history.js';
 import admin_preferences from './routes/admin/preferences.js';
 import admin_products from './routes/admin/products.js';
@@ -45,6 +46,7 @@ app.use('/api/v1/register', register_route);
 app.use('/api/v1/products', user_products);
 app.use('/api/v1/categories', user_categories);
 
+app.use('/api/v1/admin/defaultMargin', admin_default_margin);
 app.use('/api/v1/admin/authenticate', admin_auth);
 app.use('/api/v1/admin/products', admin_products);
 app.use('/api/v1/admin/boxes', admin_boxes);

src/routes/admin/default_margin.js

@@ -0,0 +1,21 @@
+import express from 'express';
+import { getPreference, preferences, setPreference } from '../../db/preferences.js';
+import authMiddleware from '../authMiddleware.js';
+
+const { GLOBAL_DEFAULT_MARGIN } = preferences;
+
+const router = express.Router();
+
+router.use(authMiddleware('ADMIN', process.env.JWT_ADMIN_SECRET));
+
+router.get('/', async (_req, res) => {
+	const margin = await getPreference(GLOBAL_DEFAULT_MARGIN);
+	res.status(200).json({ margin });
+});
+
+router.patch('/', async (req, res) => {
+	await setPreference(GLOBAL_DEFAULT_MARGIN, req.body.margin);
+	res.status(200).send();
+});
+
+export default router;