add budget investment stats

app/controllers/admin/api/stats_controller.rb

@@ -4,7 +4,8 @@ class Admin::Api::StatsController < Admin::Api::BaseController
     unless params[:event].present? ||
            params[:visits].present? ||
            params[:spending_proposals].present? ||
-           params[:budget_investments].present?
+           params[:budget_investments].present? ||
+           params[:user_supported_budgets].present?
       return render json: {}, status: :bad_request
     end
 
@@ -26,6 +27,9 @@ class Admin::Api::StatsController < Admin::Api::BaseController
       ds.add "Budget Investments", Budget::Investment.group_by_day(:created_at).count
     end
 
+    if params[:user_supported_budgets].present?
+      ds.add "User supported budgets", Vote.where(votable_type: "Budget::Investment").group_by_day(:updated_at).count
+    end
     render json: ds.build
   end
 end