Use each_batch to find rows efficiently with group_by

app/workers/rescue_stale_live_trace_worker.rb

@@ -6,20 +6,21 @@ class RescueStaleLiveTraceWorker
     # Reschedule to archive live traces
     #
     # The target jobs are with the following conditions
-    # - Finished 1 day ago, but it has not had an acthived trace yet
-    #   Jobs finished 1 day ago should have an archived trace. Probably ArchiveTraceWorker failed by Sidekiq's inconsistancy
+    # - Finished 1 hour ago, but it has not had an acthived trace yet
+    #   Jobs finished 1 hour ago should have an archived trace. Probably ArchiveTraceWorker failed by Sidekiq's inconsistancy
     Ci::BuildTraceChunk
+      .include(EachBatch)
       .select(:build_id)
       .group(:build_id)
       .joins(:build)
       .merge(Ci::Build.finished)
       .where('ci_builds.finished_at < ?', 1.hour.ago)
-      .each do |chunks| # TODO: find_each gives an error because of group_by
+      .each_batch(column: :build_id) do |chunks|
         build_ids = chunks.map { |chunk| [chunk.build_id] }
 
         ArchiveTraceWorker.bulk_perform_async(build_ids)
 
-        Rails.logger.warning "Scheduled to archive stale live traces from #{build_ids.min} to #{build_ids.max}"
+        Rails.logger.info "Scheduled to archive stale live traces from #{build_ids.min} to #{build_ids.max}"
       end
   end
 end