Drop SessionMiddleware (missing imports anyway).

paste/middleware.py

@@ -1,21 +0,0 @@
-from webtools import settings
-
-
-from django.contrib.sessions.middleware import (
-    SessionMiddleware as DjangoSessionMiddleware,
-)
-
-
-class SessionMiddleware(DjangoSessionMiddleware):
-    def process_request(self, request):
-        if "admin" in request.path:
-            session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
-            request.session = self.SessionStore(session_key)
-        else:
-            request.session = {}
-
-    def process_response(self, request, response):
-        if "admin" in request.path:
-            return super().process_response(request, response)
-        else:
-            return response

webtools/settings.py

@@ -73,7 +73,7 @@ TEMPLATES = [
 ]
 
 MIDDLEWARE = [
-    "paste.middleware.SessionMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.common.CommonMiddleware",