Replace notifications with activity feed

backend/services/activityService.js

@@ -0,0 +1,14 @@
+const crypto = require('crypto');
+
+const recordActivity = async (db, { userId, type = 'info', title, message, link = null }) => {
+  if (!userId || !title || !message) return;
+
+  await db.query(
+    'INSERT INTO notifications (id, user_id, type, title, message, link) VALUES (?, ?, ?, ?, ?, ?)',
+    [crypto.randomUUID(), userId, type, title, message, link]
+  );
+};
+
+module.exports = {
+  recordActivity,
+};