diff --git a/utils/analytics.py b/utils/analytics.py
index b816055..77f77df 100644
--- a/utils/analytics.py
+++ b/utils/analytics.py
@@ -49,8 +49,8 @@ def get_or_create_analytics_session():
                     'cookie_names': list(request.cookies.keys()),
                     'session_key': analytics_session_id[:8],
                 }) + '\n')
-        except Exception:
-            pass
+        except Exception as _e:
+            logger.error(f"PWA debug write failed: {_e}")
 
     db = SessionLocal()
     try:
diff --git a/utils/middleware.py b/utils/middleware.py
index cafacde..b798ea1 100644
--- a/utils/middleware.py
+++ b/utils/middleware.py
@@ -85,6 +85,12 @@ def register_middleware(app):
             return
 
         try:
+            # DEBUG: middleware-level mobile cookie check
+            _ua = request.headers.get('User-Agent', '').lower()
+            if 'mobile' in _ua:
+                with open('/tmp/pwa_debug.log', 'a') as _mf:
+                    _mf.write(f"MIDDLEWARE: path={request.path} pwa_mode={request.cookies.get('pwa_mode')} pwa_display={request.cookies.get('pwa_display')}\n")
+
             from utils.analytics import (
                 track_page_view_for_request,
                 set_current_page_view_id