WIP: preserve Issue #479 changes

backend/app/controllers/counts_tables_controller.rb

@@ -24,7 +24,7 @@ class CountsTablesController < ApplicationController
     render json: { error: 'private_condition' }, status: :forbidden
   rescue CountsTableQuery::TooManyColumns
     render json: { error: 'too_many_columns', max_columns: CountsTableQuery::MAX_COLUMNS },
-           status: :unprocessable_entity
+           status: :unprocessable_content
   rescue CountsPivotTotals::TimedOut
     Rails.logger.warn('counts_query_timeout: pivot_totals')
     render json: { error: 'counts_query_timeout', stage: 'totals',