1 files changed, 0 insertions, 71 deletions
diff --git a/db/post_migrate/20210226141517_dedup_issue_metrics.rb b/db/post_migrate/20210226141517_dedup_issue_metrics.rb
deleted file mode 100644
index 8228d509e07..00000000000
--- a/db/post_migrate/20210226141517_dedup_issue_metrics.rb
+++ /dev/null
@@ -1,71 +0,0 @@
-# frozen_string_literal: true
-
-class DedupIssueMetrics < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-  TMP_INDEX_NAME = 'tmp_unique_issue_metrics_by_issue_id'
-  OLD_INDEX_NAME = 'index_issue_metrics'
-  INDEX_NAME = 'index_unique_issue_metrics_issue_id'
-  BATCH_SIZE = 1_000
-
-  disable_ddl_transaction!
-
-  class IssueMetrics < ActiveRecord::Base
-    self.table_name = 'issue_metrics'
-
-    include EachBatch
-  end
-
-  def up
-    IssueMetrics.reset_column_information
-
-    last_metrics_record_id = IssueMetrics.maximum(:id) || 0
-
-    # This index will disallow further duplicates while we're deduplicating the data.
-    add_concurrent_index(:issue_metrics, :issue_id, where: "id > #{Integer(last_metrics_record_id)}", unique: true, name: TMP_INDEX_NAME)
-
-    IssueMetrics.each_batch(of: BATCH_SIZE) do |relation|
-      duplicated_issue_ids = IssueMetrics
-        .where(issue_id: relation.select(:issue_id))
-        .select(:issue_id)
-        .group(:issue_id)
-        .having('COUNT(issue_metrics.issue_id) > 1')
-        .pluck(:issue_id)
-
-      duplicated_issue_ids.each do |issue_id|
-        deduplicate_item(issue_id)
-      end
-    end
-
-    add_concurrent_index(:issue_metrics, :issue_id, unique: true, name: INDEX_NAME)
-    remove_concurrent_index_by_name(:issue_metrics, TMP_INDEX_NAME)
-    remove_concurrent_index_by_name(:issue_metrics, OLD_INDEX_NAME)
-  end
-
-  def down
-    add_concurrent_index(:issue_metrics, :issue_id, name: OLD_INDEX_NAME)
-    remove_concurrent_index_by_name(:issue_metrics, TMP_INDEX_NAME)
-    remove_concurrent_index_by_name(:issue_metrics, INDEX_NAME)
-  end
-
-  private
-
-  def deduplicate_item(issue_id)
-    issue_metrics_records = IssueMetrics.where(issue_id: issue_id).order(updated_at: :asc).to_a
-
-    attributes = {}
-    issue_metrics_records.each do |issue_metrics_record|
-      params = issue_metrics_record.attributes.except('id')
-      attributes.merge!(params.compact)
-    end
-
-    ActiveRecord::Base.transaction do
-      record_to_keep = issue_metrics_records.pop
-      records_to_delete = issue_metrics_records
-
-      IssueMetrics.where(id: records_to_delete.map(&:id)).delete_all
-      record_to_keep.update!(attributes)
-    end
-  end
-end