1 files changed, 0 insertions, 58 deletions
diff --git a/lib/gitlab/background_migration/remove_duplicate_services.rb b/lib/gitlab/background_migration/remove_duplicate_services.rb
deleted file mode 100644
index 59fb9143a72..00000000000
--- a/lib/gitlab/background_migration/remove_duplicate_services.rb
+++ /dev/null
@@ -1,58 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module BackgroundMigration
-    # Remove duplicated service records with the same project and type.
-    # These were created in the past for unknown reasons, and should be blocked
-    # now by the uniqueness validation in the Service model.
-    class RemoveDuplicateServices
-      # See app/models/service
-      class Service < ActiveRecord::Base
-        include EachBatch
-
-        self.table_name = 'services'
-        self.inheritance_column = :_type_disabled
-
-        scope :project_ids_with_duplicates, -> do
-          select(:project_id)
-            .distinct
-            .where.not(project_id: nil)
-            .group(:project_id, :type)
-            .having('count(*) > 1')
-        end
-
-        scope :types_with_duplicates, -> (project_ids) do
-          select(:project_id, :type)
-            .where(project_id: project_ids)
-            .group(:project_id, :type)
-            .having('count(*) > 1')
-        end
-      end
-
-      def perform(*project_ids)
-        types_with_duplicates = Service.types_with_duplicates(project_ids).pluck(:project_id, :type)
-
-        types_with_duplicates.each do |project_id, type|
-          remove_duplicates(project_id, type)
-        end
-      end
-
-      private
-
-      def remove_duplicates(project_id, type)
-        scope = Service.where(project_id: project_id, type: type)
-
-        # Build a subquery to determine which service record is actually in use,
-        # by querying for it without specifying an order.
-        #
-        # This should match the record returned by `Project#find_service`,
-        # and the `has_one` service associations on `Project`.
-        correct_service = scope.select(:id).limit(1)
-
-        # Delete all other services with the same `project_id` and `type`
-        duplicate_services = scope.where.not(id: correct_service)
-        duplicate_services.delete_all
-      end
-    end
-  end
-end