Schedule productivity analytics backfill

changelogs/unreleased/backport-schedule-productivity-analytics-backfill.yml

+---
+title: Schedule productivity analytics recalculation for EE
+merge_request: 15137
+author:
+type: other

db/post_migrate/20190724091326_schedule_productivity_analytics_backfill.rb

+# frozen_string_literal: true
+
+class ScheduleProductivityAnalyticsBackfill < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  BATCH_SIZE = 10_000
+  INTERVAL = 3.minutes
+  MIGRATION = 'Gitlab::BackgroundMigration::RecalculateProductivityAnalytics'.freeze
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab.ee?
+
+    metrics_model = Class.new(ActiveRecord::Base) do
+      self.table_name = 'merge_request_metrics'
+
+      include ::EachBatch
+    end
+
+    scope = metrics_model.where("merged_at >= ?", 3.months.ago)
+
+    queue_background_migration_jobs_by_range_at_intervals(scope, MIGRATION, INTERVAL, batch_size: BATCH_SIZE)
+  end
+
+  def down
+    # no-op
+  end
+end