parallelized set Import

src/controllers/importController.js

@@ -1,14 +1,20 @@
 const { fetchAllSets } = require('../services/ygoproService');
 const { upsertSet } = require('../models/setModel');
 
+const BATCH_SIZE = 10;
+
 async function importSets(req, res) {
   try {
     const sets = await fetchAllSets();
     let added = 0;
 
-    for (const set of sets) {
-      await upsertSet(set);
-      added++;
+    // Parallelized batch insert
+    for (let i = 0; i < sets.length; i += BATCH_SIZE) {
+      const batch = sets.slice(i, i + BATCH_SIZE);
+      await Promise.all(batch.map(async (set) => {
+        await upsertSet(set);
+        added++;
+      }));
     }
 
     res.json({
@@ -16,7 +22,7 @@ async function importSets(req, res) {
       total: sets.length
     });
   } catch (err) {
-    console.error(err);
+    console.error('Error importing sets:', err);
     res.status(500).json({ error: 'Failed to import sets' });
   }
 }