Useful error traces back

app/controllers/signup_controller.rb

@@ -60,6 +60,7 @@ class SignupController < ApplicationController
     else
       @user = account_creator.user
       errors = account_creator.validation_errors
+      CartoDB.notify_debug('User not valid at signup', { errors: errors } )
       if errors['organization'] && !errors[:organization].empty?
         @signup_source = 'Organization'
         render 'shared/signup_issue'

app/queries/carto/visualization_query_builder.rb

@@ -207,6 +207,10 @@ class Carto::VisualizationQueryBuilder
   def build
     query = Carto::Visualization.scoped
 
+    if @name && !(@id || @user_id || @organization_id || @owned_by_or_shared_with_user_id || @shared_with_user_id)
+      CartoDB::Logger.debug(message: "VQB query by name without user_id nor org_id")
+    end
+
     if @id
       query = query.where(id: @id)
     end