Jun 24 - Implement devices tracker - Fix 500 error

app/routes/devices.py

@@ -25,7 +25,7 @@ def index():
     """Show all registered devices, most-recently-seen first."""
     devices = (
         DeviceToken.query
-        .order_by(DeviceToken.last_seen_at.desc().nullslast())
+        .order_by(DeviceToken.registered_at.desc())
         .all()
     )
     return render_template('admin/devices.html', devices=devices)
@@ -96,4 +96,4 @@ def notify_update():
         f'Update notice sent to {notified} user(s) on {len(outdated)} outdated device(s).',
         'success'
     )
-    return redirect(url_for('devices.index'))
+    return redirect(url_for('devices.index'))