Use signals to save ip, user_agent, last_login in sessions

oj/settings.py

@@ -33,10 +33,11 @@ BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
 INSTALLED_APPS = (
     'django.contrib.auth',
-    'django.contrib.contenttypes',
     'django.contrib.sessions',
+    'django.contrib.contenttypes',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'rest_framework',
 
     'account',
     'announcement',
@@ -45,8 +46,6 @@ INSTALLED_APPS = (
     'contest',
     'utils',
     'submission',
-
-    'rest_framework',
 )
 
 MIDDLEWARE_CLASSES = (
@@ -54,14 +53,14 @@ MIDDLEWARE_CLASSES = (
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
     'django.middleware.security.SecurityMiddleware',
     'account.middleware.AdminRoleRequiredMiddleware',
     'account.middleware.SessionSecurityMiddleware',
+    # 'account.middleware.LogSqlMiddleware',
 )
-
+SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
 ROOT_URLCONF = 'oj.urls'
 
 TEMPLATES = [