diff --git a/server/app.py b/server/app.py
index f9711c5..14edb87 100644
--- a/server/app.py
+++ b/server/app.py
@@ -562,8 +562,13 @@ def recompute_trips():
 @app.get("/api/trips")
 @require_login
 def portal_trips_compat():
-    """Pi history.js compatibility alias."""
-    return portal_trips()
+    """Pi history.js compatibility alias — wraps response in {trips: [...]}."""
+    device_id = _portal_device_id()
+    if device_id is None:
+        return jsonify(error="device not configured"), 404
+    limit = min(int(request.args.get("limit", 200)), 1000)
+    trips = db.list_trips(device_id, limit=limit)
+    return jsonify(trips=trips)
 
 
 @app.get("/api/trip/<int:trip_id>")
diff --git a/server/modules/user_auth.py b/server/modules/user_auth.py
index 7fb957d..5cb7c4c 100644
--- a/server/modules/user_auth.py
+++ b/server/modules/user_auth.py
@@ -38,10 +38,14 @@ def hash_password(plain):
 
 
 def require_login(view):
-    """Decorator: redirect to login page if not authenticated."""
+    """Decorator: redirect to login page if not authenticated (HTML routes),
+    or return 401 JSON for /api/* routes."""
     @wraps(view)
     def wrapped(*args, **kwargs):
         if not current_user.is_authenticated:
+            from flask import request, jsonify
+            if request.path.startswith("/api/"):
+                return jsonify(error="not authenticated"), 401
             return redirect(url_for("login_page"))
         return view(*args, **kwargs)
     return wrapped
diff --git a/static/js/history.js b/static/js/history.js
index c9f9c1b..356b293 100644
--- a/static/js/history.js
+++ b/static/js/history.js
@@ -189,7 +189,7 @@
                 <td>${formatDistance(trip.distance_km)}</td>
                 <td>${formatDuration(trip.duration_seconds)}</td>
                 <td>${formatSpeed(trip.max_speed_kmh)}</td>
-                <td class="text-muted small">${trip.odo_start_km.toFixed(0)} → ${trip.odo_end_km.toFixed(0)} km</td>
+                <td class="text-muted small">${trip.odo_start_km != null ? trip.odo_start_km.toFixed(0) + ' → ' + trip.odo_end_km.toFixed(0) + ' km' : '—'}</td>
                 <td class="text-end d-none d-sm-table-cell">
                     <button class="btn btn-sm btn-primary" type="button" data-trip-id="${trip.id}">
                         Replay