1 files changed, 0 insertions, 65 deletions
diff --git a/db/post_migrate/20200526115436_dedup_mr_metrics.rb b/db/post_migrate/20200526115436_dedup_mr_metrics.rb
deleted file mode 100644
index d2660504939..00000000000
--- a/db/post_migrate/20200526115436_dedup_mr_metrics.rb
+++ /dev/null
@@ -1,65 +0,0 @@
-# frozen_string_literal: true
-
-class DedupMrMetrics < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-  TMP_INDEX_NAME = 'tmp_unique_merge_request_metrics_by_merge_request_id'
-  INDEX_NAME = 'unique_merge_request_metrics_by_merge_request_id'
-
-  disable_ddl_transaction!
-
-  class MergeRequestMetrics < ActiveRecord::Base
-    self.table_name = 'merge_request_metrics'
-
-    include EachBatch
-  end
-
-  def up
-    last_metrics_record_id = MergeRequestMetrics.maximum(:id) || 0
-
-    # This index will disallow further duplicates while we're deduplicating the data.
-    add_concurrent_index(:merge_request_metrics, :merge_request_id, where: "id > #{Integer(last_metrics_record_id)}", unique: true, name: TMP_INDEX_NAME)
-
-    MergeRequestMetrics.each_batch do |relation|
-      duplicated_merge_request_ids = MergeRequestMetrics
-        .where(merge_request_id: relation.select(:merge_request_id))
-        .select(:merge_request_id)
-        .group(:merge_request_id)
-        .having('COUNT(merge_request_metrics.merge_request_id) > 1')
-        .pluck(:merge_request_id)
-
-      duplicated_merge_request_ids.each do |merge_request_id|
-        deduplicate_item(merge_request_id)
-      end
-    end
-
-    add_concurrent_index(:merge_request_metrics, :merge_request_id, unique: true, name: INDEX_NAME)
-    remove_concurrent_index_by_name(:merge_request_metrics, TMP_INDEX_NAME)
-  end
-
-  def down
-    remove_concurrent_index_by_name(:merge_request_metrics, TMP_INDEX_NAME)
-    remove_concurrent_index_by_name(:merge_request_metrics, INDEX_NAME)
-  end
-
-  private
-
-  def deduplicate_item(merge_request_id)
-    merge_request_metrics_records = MergeRequestMetrics.where(merge_request_id: merge_request_id).order(updated_at: :asc).to_a
-
-    attributes = {}
-    merge_request_metrics_records.each do |merge_request_metrics_record|
-      params = merge_request_metrics_record.attributes.except('id')
-      attributes.merge!(params.compact)
-    end
-
-    ActiveRecord::Base.transaction do
-      record_to_keep = merge_request_metrics_records.pop
-      records_to_delete = merge_request_metrics_records
-
-      MergeRequestMetrics.where(id: records_to_delete.map(&:id)).delete_all
-      record_to_keep.update!(attributes)
-    end
-  end
-end