Remove index from chat_names and service_id

changelogs/unreleased/204787-remove-cleanup-chat-names.yml

+---
+title: Remove index from chat_names and service_id
+merge_request: 37054
+author:
+type: other

db/migrate/20200727082309_remove_index_chat_name_service_id.rb

+# frozen_string_literal: true
+
+class RemoveIndexChatNameServiceId < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index :chat_names, :service_id
+  end
+
+  def down
+    add_concurrent_index :chat_names, :service_id
+  end
+end

db/schema_migrations/20200727082309

+72c7ca9e1284483e653d6d8dc16103f104502d7cd569cb3f7ab75e932807a661
\ No newline at end of file

db/structure.sql

@@ -18997,8 +18997,6 @@ CREATE INDEX index_boards_on_project_id ON public.boards USING btree (project_id
 
 CREATE INDEX index_broadcast_message_on_ends_at_and_broadcast_type_and_id ON public.broadcast_messages USING btree (ends_at, broadcast_type, id);
 
-CREATE INDEX index_chat_names_on_service_id ON public.chat_names USING btree (service_id);
-
 CREATE UNIQUE INDEX index_chat_names_on_service_id_and_team_id_and_chat_id ON public.chat_names USING btree (service_id, team_id, chat_id);
 
 CREATE UNIQUE INDEX index_chat_names_on_user_id_and_service_id ON public.chat_names USING btree (user_id, service_id);