clean up exports weekly

app/jobs/scheduled/weekly.rb

@@ -11,6 +11,7 @@ module Jobs
       Post.calculate_avg_time
       Topic.calculate_avg_time
       ScoreCalculator.new.calculate
+      ExportCsv.remove_old_exports # delete exported CSV files older than 2 days
     end
   end
 end

app/models/export_csv.rb

@@ -9,6 +9,15 @@ class ExportCsv
     end
   end
 
+  def self.remove_old_exports
+    dir = Dir.new(ExportCsv.base_directory)
+    dir.each do |file|
+      if (File.mtime(File.join(ExportCsv.base_directory, file)) < 2.days.ago)
+        File.delete(File.join(ExportCsv.base_directory, file))
+      end
+    end
+  end
+
   def self.base_directory
     File.join(Rails.root, "public", "uploads", "csv_exports", RailsMultisite::ConnectionManagement.current_db)
   end