Index ci_pipelines on pipeline_schedule_id and id

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/50478

app/controllers/projects/pipeline_schedules_controller.rb

@@ -17,7 +17,6 @@ class Projects::PipelineSchedulesController < Projects::ApplicationController
     @scope = params[:scope]
     @all_schedules = Ci::PipelineSchedulesFinder.new(@project).execute
     @schedules = Ci::PipelineSchedulesFinder.new(@project).execute(scope: params[:scope])
-      .includes(:last_pipeline)
   end
   # rubocop: enable CodeReuse/ActiveRecord
 

changelogs/unreleased/254664-fix-pipeline-schedules-timeouts.yml

+---
+title: Index ci_pipelines on pipeline_schedule_id and id
+merge_request: 50478
+author:
+type: performance

db/post_migrate/20201223012231_reindex_ci_pipelines_on_schedule_id_and_id.rb

+# frozen_string_literal: true
+
+class ReindexCiPipelinesOnScheduleIdAndId < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  OLD_INDEX_NAME = 'index_ci_pipelines_on_pipeline_schedule_id'
+  NEW_INDEX_NAME = 'index_ci_pipelines_on_pipeline_schedule_id_and_id'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :ci_pipelines, [:pipeline_schedule_id, :id], name: NEW_INDEX_NAME
+    remove_concurrent_index_by_name :ci_pipelines, OLD_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :ci_pipelines, :pipeline_schedule_id, name: OLD_INDEX_NAME
+    remove_concurrent_index_by_name :ci_pipelines, NEW_INDEX_NAME
+  end
+end

db/schema_migrations/20201223012231

+e845a6704ac92881926cca56bf7fb01c6252f1fe2b2d94fc9d6548144126d6a5
\ No newline at end of file

db/structure.sql

@@ -21088,7 +21088,7 @@ CREATE INDEX index_ci_pipelines_on_external_pull_request_id ON ci_pipelines USIN
 
 CREATE INDEX index_ci_pipelines_on_merge_request_id ON ci_pipelines USING btree (merge_request_id) WHERE (merge_request_id IS NOT NULL);
 
-CREATE INDEX index_ci_pipelines_on_pipeline_schedule_id ON ci_pipelines USING btree (pipeline_schedule_id);
+CREATE INDEX index_ci_pipelines_on_pipeline_schedule_id_and_id ON ci_pipelines USING btree (pipeline_schedule_id, id);
 
 CREATE INDEX index_ci_pipelines_on_project_id_and_id_desc ON ci_pipelines USING btree (project_id, id DESC);