Adds creator_id field to packages table

- adds creator_id field
- adds index on creator_id
- adds fk to users table

changelogs/unreleased/205578-add-creator-id-to-packages.yml

+---
+title: Adds creator_id field to packages table
+merge_request: 40562
+author:
+type: other

db/migrate/20200827005322_add_creator_id_to_packages.rb

+# frozen_string_literal: true
+
+class AddCreatorIdToPackages < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    add_column(:packages_packages, :creator_id, :integer)
+  end
+end

db/migrate/20200830201204_add_index_to_package_creator.rb

+# frozen_string_literal: true
+
+class AddIndexToPackageCreator < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_packages_packages_on_creator_id'
+
+  def up
+    add_concurrent_index :packages_packages, :creator_id, name: INDEX_NAME
+    add_concurrent_foreign_key(:packages_packages, :users, column: :creator_id, on_delete: :nullify)
+  end
+
+  def down
+    remove_foreign_key_if_exists(:packages_packages, :users, column: :creator_id)
+    remove_concurrent_index_by_name(:packages_packages, INDEX_NAME)
+  end
+end

db/schema_migrations/20200827005322

+f4f1efcc93476a1d70add93e166f4c702ad7dfc97ad29c3455722fd98824498f
\ No newline at end of file

db/schema_migrations/20200830201204

+1e8dd4542b13009b748d352933a4a59fcabb31e916226fcbf87043396f94e09f
\ No newline at end of file

db/structure.sql

@@ -13965,7 +13965,8 @@ CREATE TABLE public.packages_packages (
     updated_at timestamp with time zone NOT NULL,
     name character varying NOT NULL,
     version character varying,
-    package_type smallint NOT NULL
+    package_type smallint NOT NULL,
+    creator_id integer
 );
 
 CREATE SEQUENCE public.packages_packages_id_seq
@@ -20339,6 +20340,8 @@ CREATE INDEX index_packages_package_files_on_file_store ON public.packages_packa
 
 CREATE INDEX index_packages_package_files_on_package_id_and_file_name ON public.packages_package_files USING btree (package_id, file_name);
 
+CREATE INDEX index_packages_packages_on_creator_id ON public.packages_packages USING btree (creator_id);
+
 CREATE INDEX index_packages_packages_on_name_trigram ON public.packages_packages USING gin (name public.gin_trgm_ops);
 
 CREATE INDEX index_packages_packages_on_project_id_and_created_at ON public.packages_packages USING btree (project_id, created_at);
@@ -21911,6 +21914,9 @@ ALTER TABLE ONLY public.ci_builds
 ALTER TABLE ONLY public.design_management_versions
     ADD CONSTRAINT fk_c1440b4896 FOREIGN KEY (author_id) REFERENCES public.users(id) ON DELETE SET NULL;
 
+ALTER TABLE ONLY public.packages_packages
+    ADD CONSTRAINT fk_c188f0dba4 FOREIGN KEY (creator_id) REFERENCES public.users(id) ON DELETE SET NULL;
+
 ALTER TABLE ONLY public.geo_event_log
     ADD CONSTRAINT fk_c1f241c70d FOREIGN KEY (upload_deleted_event_id) REFERENCES public.geo_upload_deleted_events(id) ON DELETE CASCADE;