Fix setting of conn_max_age variable

src/khoj/app/settings.py

@@ -110,7 +110,6 @@ TEMPLATES = [
 
 WSGI_APPLICATION = "app.wsgi.application"
 
-
 # Database
 # https://docs.djangoproject.com/en/4.2/ref/settings/#databases
 
@@ -122,6 +121,7 @@ DATABASES = {
         "USER": os.getenv("POSTGRES_USER", "postgres"),
         "NAME": os.getenv("POSTGRES_DB", "khoj"),
         "PASSWORD": os.getenv("POSTGRES_PASSWORD", "postgres"),
+        "CONN_MAX_AGE": 240,
     }
 }