Migrate to Postgresql for better network handling. Add more user functionality.

app/controllers/application_controller.rb

@@ -7,9 +7,13 @@ class ApplicationController < ActionController::Base
   stale_when_importmap_changes
 
   include Pagy::Backend
+  include Pagy::Frontend
+  include Pundit::Authorization
 
   helper_method :current_user, :user_signed_in?, :current_user_admin?, :current_user_viewer?
 
+  rescue_from Pundit::NotAuthorizedError, with: :user_not_authorized
+
   private
 
   def current_user
@@ -43,4 +47,12 @@ class ApplicationController < ActionController::Base
   def after_authentication_url
     session.delete(:return_to_after_authenticating) || root_url
   end
+
+  def user_not_authorized
+    if user_signed_in?
+      redirect_to root_path, alert: "You don't have permission to perform this action."
+    else
+      redirect_to new_session_path, alert: "Please sign in to continue."
+    end
+  end
 end