Account Sync should happen at login, 1x per day, OR on-demand (#594)

* Add last_sync_date to accounts table

* Always sync Account after Valuation or Transaction creation, update, or deletion.

Skip sync if user clicks "sync" button without changing anything

* Sync user accounts daily based on last_login_at

app/controllers/concerns/authentication.rb

@@ -3,11 +3,13 @@ module Authentication
 
   included do
     before_action :authenticate_user!
+    after_action :set_last_login_at
   end
 
   class_methods do
     def skip_authentication(**options)
       skip_before_action :authenticate_user!, **options
+      skip_after_action :set_last_login_at, **options
     end
   end
 
@@ -31,4 +33,8 @@ module Authentication
     Current.user = nil
     reset_session
   end
+
+  def set_last_login_at
+    Current.user.update(last_login_at: DateTime.now)
+  end
 end