Reduce memory use in race score loader

app/services/race_score_loader.rb

@@ -2,14 +2,19 @@ class RaceScoreLoader
   def self.reset(schools: School.all, academic_years: AcademicYear.all, measures: Measure.all, races: Race.all)
     RaceScore.where(school: schools, academic_year: academic_years, measure: measures, race: races).delete_all
     measures.each do |measure|
-      loadable_race_scores = schools.map do |school|
-        academic_years.map do |academic_year|
+      schools.each do |school|
+        loadable_race_scores = []
+        loadable_race_scores = academic_years.map do |academic_year|
           races.map do |race|
             process_score(measure:, school:, academic_year:, race:)
           end
         end
+        RaceScore.import(loadable_race_scores.flatten.compact, batch_size: 1_000, on_duplicate_key_update: :all)
+        @grouped_responses = nil
+        @total_responses = nil
+        @response_rate = nil
+        @sufficient_responses = nil
       end
-      RaceScore.import(loadable_race_scores.flatten.compact, batch_size: 1_000, on_duplicate_key_update: :all)
     end
   end