basic set import works

src/controllers/importController.js

@@ -0,0 +1,24 @@
+const { fetchAllSets } = require('../services/ygoproService');
+const { upsertSet } = require('../models/setModel');
+
+async function importSets(req, res) {
+  try {
+    const sets = await fetchAllSets();
+    let added = 0;
+
+    for (const set of sets) {
+      await upsertSet(set);
+      added++;
+    }
+
+    res.json({
+      added,
+      total: sets.length
+    });
+  } catch (err) {
+    console.error(err);
+    res.status(500).json({ error: 'Failed to import sets' });
+  }
+}
+
+module.exports = { importSets };