Fix 2FA

backend/src/db/index.js

@@ -1789,6 +1789,15 @@ db.exec('CREATE INDEX IF NOT EXISTS idx_2fa_dev_uid   ON two_fa_trusted_devices(
   }
 }
 
+// ── Migration : last_seen_at sur two_fa_trusted_devices ──────────────────────
+{
+  const devCols2 = db.prepare('PRAGMA table_info(two_fa_trusted_devices)').all().map(c => c.name);
+  if (!devCols2.includes('last_seen_at')) {
+    db.exec('ALTER TABLE two_fa_trusted_devices ADD COLUMN last_seen_at TEXT');
+    console.log('[DB] two_fa_trusted_devices.last_seen_at ajouté');
+  }
+}
+
 console.log('[DB] Migrations 2FA OK');
 
 export default db;