Make migration only start once the "Next" button is pressed.

src/pages/api/migrate.ts

@@ -0,0 +1,21 @@
+import { NextApiRequest, NextApiResponse } from 'next';
+import fs from 'fs';
+import { backendMigrateConfig } from '../../tools/config/backendMigrateConfig';
+
+export default async (req: NextApiRequest, res: NextApiResponse) => {
+  // Get all the configs in the /data/configs folder
+  const configs = fs.readdirSync('./data/configs');
+  // If there is no config, redirect to the index
+  configs.every((config) => {
+    const configData = JSON.parse(fs.readFileSync(`./data/configs/${config}`, 'utf8'));
+    if (!configData.schemaVersion) {
+      // Migrate the config
+      backendMigrateConfig(configData, config.replace('.json', ''));
+    }
+    return config;
+  });
+  return res.status(200).json({
+    success: true,
+    message: 'Configs migrated',
+  });
+};