Add epic_id to resource_state_events

With foreign key to epics and index on epic_id

changelogs/unreleased/add-epic-id-to-resource-state-event-pd.yml

+---
+title: Add epic_id to resource_state_events
+merge_request: 31587
+author:
+type: other

db/migrate/20200511092246_add_epic_id_to_resource_state_events.rb

+# frozen_string_literal: true
+
+class AddEpicIdToResourceStateEvents < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  INDEX_NAME = 'index_resource_state_events_on_epic_id'
+
+  def up
+    add_column :resource_state_events, :epic_id, :integer
+    add_index :resource_state_events, :epic_id, name: INDEX_NAME # rubocop:disable Migration/AddIndex
+  end
+
+  def down
+    remove_index  :resource_state_events, name: INDEX_NAME # rubocop:disable Migration/RemoveIndex
+    remove_column :resource_state_events, :epic_id, :integer
+  end
+end

db/migrate/20200511092505_add_foreign_key_to_epic_id_on_resource_state_events.rb

+# frozen_string_literal: true
+
+class AddForeignKeyToEpicIdOnResourceStateEvents < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    with_lock_retries do
+      add_foreign_key :resource_state_events, :epics, column: :epic_id, on_delete: :cascade # rubocop:disable Migration/AddConcurrentForeignKey
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :resource_state_events, column: :epic_id
+    end
+  end
+end

db/structure.sql

@@ -5812,6 +5812,7 @@ CREATE TABLE public.resource_state_events (
     merge_request_id bigint,
     created_at timestamp with time zone NOT NULL,
     state smallint NOT NULL,
+    epic_id integer,
     CONSTRAINT resource_state_events_must_belong_to_issue_or_merge_request CHECK ((((issue_id <> NULL::bigint) AND (merge_request_id IS NULL)) OR ((merge_request_id <> NULL::bigint) AND (issue_id IS NULL))))
 );
 
@@ -10521,6 +10522,8 @@ CREATE INDEX index_resource_milestone_events_on_milestone_id ON public.resource_
 
 CREATE INDEX index_resource_milestone_events_on_user_id ON public.resource_milestone_events USING btree (user_id);
 
+CREATE INDEX index_resource_state_events_on_epic_id ON public.resource_state_events USING btree (epic_id);
+
 CREATE INDEX index_resource_state_events_on_issue_id_and_created_at ON public.resource_state_events USING btree (issue_id, created_at);
 
 CREATE INDEX index_resource_state_events_on_merge_request_id ON public.resource_state_events USING btree (merge_request_id);
@@ -12412,6 +12415,9 @@ ALTER TABLE ONLY public.vulnerability_occurrences
 ALTER TABLE ONLY public.project_export_jobs
     ADD CONSTRAINT fk_rails_c88d8db2e1 FOREIGN KEY (project_id) REFERENCES public.projects(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY public.resource_state_events
+    ADD CONSTRAINT fk_rails_c913c64977 FOREIGN KEY (epic_id) REFERENCES public.epics(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY public.resource_milestone_events
     ADD CONSTRAINT fk_rails_c940fb9fc5 FOREIGN KEY (milestone_id) REFERENCES public.milestones(id) ON DELETE CASCADE;
 
@@ -13809,6 +13815,8 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200506154421
 20200507221434
 20200508091106
+20200511092246
+20200511092505
 20200511092714
 20200511115430
 20200511115431