Подправил вывод времени генерации

core/context_processors.py

@@ -0,0 +1,11 @@
+import os
+
+
+def env_and_timing(request):
+    """Provide ENV_TYPE and request timing info to templates."""
+    env = os.getenv('ENV_TYPE', 'local')
+    return {
+        'env_type': env,
+        'db_time': getattr(request, 'db_time', None),
+        'total_time': getattr(request, 'total_time', None),
+    }

core/middleware.py

@@ -0,0 +1,43 @@
+import time
+from django.db import connection
+
+
+class TimingMiddleware:
+    """Middleware that measures request total time and DB query time.
+
+    Note: `connection.queries` is populated only when Django debug is enabled
+    (DEBUG=True) or when using a debug cursor. When not available, DB time
+    will be left as None.
+    """
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        start = time.time()
+
+        # record initial number of collected queries (if available)
+        try:
+            initial_q_count = len(connection.queries)
+        except Exception:
+            initial_q_count = 0
+
+        response = self.get_response(request)
+
+        total = time.time() - start
+
+        db_time = None
+        try:
+            qs = getattr(connection, 'queries', None)
+            if qs:
+                # sum only queries executed during this request
+                new_queries = qs[initial_q_count:]
+                db_time = sum(float(q.get('time', 0)) for q in new_queries)
+        except Exception:
+            db_time = None
+
+        # attach to request so context processor can read them
+        request.db_time = db_time
+        request.total_time = total
+
+        return response

core/settings.py

@@ -43,6 +43,7 @@ INSTALLED_APPS = [
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
+    'core.middleware.TimingMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
@@ -64,6 +65,7 @@ TEMPLATES = [
                 'django.template.context_processors.request',
                 'django.contrib.auth.context_processors.auth',
                 'django.contrib.messages.context_processors.messages',
+                'core.context_processors.env_and_timing',
             ],
         },
     },