Remove backup_labels temporary table

Removes backup_labels table used
previously used by background migrations.

changelogs/unreleased/issue_227753-remove_backup_labels_table.yml

+---
+title: Remove backup_labels table
+merge_request: 54856
+author:
+type: other

db/post_migrate/20210222185538_remove_backup_labels_foreign_keys.rb

+# frozen_string_literal: true
+
+class RemoveBackupLabelsForeignKeys < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists(:backup_labels, :projects)
+      remove_foreign_key_if_exists(:backup_labels, :namespaces)
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:backup_labels, :projects, column: :project_id, on_delete: :cascade)
+    add_concurrent_foreign_key(:backup_labels, :namespaces, column: :group_id, on_delete: :cascade)
+  end
+end

db/post_migrate/20210222192144_remove_backup_labels_table.rb

+# frozen_string_literal: true
+
+class RemoveBackupLabelsTable < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    drop_table :backup_labels
+  end
+
+  def down
+    create_table :backup_labels, id: false do |t|
+      t.integer :id, null: false
+      t.string :title
+      t.string :color
+      t.integer :project_id
+      t.timestamps null: true # rubocop:disable Migration/Timestamps
+      t.boolean :template, default: false
+      t.string :description
+      t.text :description_html
+      t.string :type
+      t.integer :group_id
+      t.integer :cached_markdown_version
+      t.integer :restore_action
+      t.string :new_title
+    end
+
+    execute 'ALTER TABLE backup_labels ADD PRIMARY KEY (id)'
+
+    add_index :backup_labels, [:group_id, :project_id, :title], name: 'backup_labels_group_id_project_id_title_idx', unique: true
+    add_index :backup_labels, [:group_id, :title], where: 'project_id = NULL::integer', name: 'backup_labels_group_id_title_idx'
+    add_index :backup_labels, :project_id, name: 'backup_labels_project_id_idx'
+    add_index :backup_labels, :template, name: 'backup_labels_template_idx', where: 'template'
+    add_index :backup_labels, :title, name: 'backup_labels_title_idx'
+    add_index :backup_labels, [:type, :project_id], name: 'backup_labels_type_project_id_idx'
+  end
+end

db/schema_migrations/20210222185538

+0bccf1ff356a4b9c08d472e8b63070b497f331c2dfaded1bdb2cf01860df8903
\ No newline at end of file

db/schema_migrations/20210222192144

+b2508d46edbfbba24df65731f6e285886acbb6352a900dd1c6a985a686252ef0
\ No newline at end of file

db/structure.sql

@@ -9747,23 +9747,6 @@ CREATE SEQUENCE background_migration_jobs_id_seq
 
 ALTER SEQUENCE background_migration_jobs_id_seq OWNED BY background_migration_jobs.id;
 
-CREATE TABLE backup_labels (
-    id integer NOT NULL,
-    title character varying,
-    color character varying,
-    project_id integer,
-    created_at timestamp without time zone,
-    updated_at timestamp without time zone,
-    template boolean DEFAULT false,
-    description character varying,
-    description_html text,
-    type character varying,
-    group_id integer,
-    cached_markdown_version integer,
-    restore_action integer,
-    new_title character varying
-);
-
 CREATE TABLE badges (
     id integer NOT NULL,
     link_url character varying NOT NULL,
@@ -19818,9 +19801,6 @@ ALTER TABLE ONLY aws_roles
 ALTER TABLE ONLY background_migration_jobs
     ADD CONSTRAINT background_migration_jobs_pkey PRIMARY KEY (id);
 
-ALTER TABLE ONLY backup_labels
-    ADD CONSTRAINT backup_labels_pkey PRIMARY KEY (id);
-
 ALTER TABLE ONLY badges
     ADD CONSTRAINT badges_pkey PRIMARY KEY (id);
 
@@ -21266,18 +21246,6 @@ CREATE UNIQUE INDEX any_approver_project_rule_type_unique_index ON approval_proj
 
 CREATE INDEX approval_mr_rule_index_merge_request_id ON approval_merge_request_rules USING btree (merge_request_id);
 
-CREATE UNIQUE INDEX backup_labels_group_id_project_id_title_idx ON backup_labels USING btree (group_id, project_id, title);
-
-CREATE INDEX backup_labels_group_id_title_idx ON backup_labels USING btree (group_id, title) WHERE (project_id = NULL::integer);
-
-CREATE INDEX backup_labels_project_id_idx ON backup_labels USING btree (project_id);
-
-CREATE INDEX backup_labels_template_idx ON backup_labels USING btree (template) WHERE template;
-
-CREATE INDEX backup_labels_title_idx ON backup_labels USING btree (title);
-
-CREATE INDEX backup_labels_type_project_id_idx ON backup_labels USING btree (type, project_id);
-
 CREATE UNIQUE INDEX bulk_import_trackers_uniq_relation_by_entity ON bulk_import_trackers USING btree (bulk_import_entity_id, relation);
 
 CREATE INDEX ci_builds_gitlab_monitor_metrics ON ci_builds USING btree (status, created_at, project_id) WHERE ((type)::text = 'Ci::Build'::text);
@@ -24456,9 +24424,6 @@ ALTER TABLE ONLY vulnerabilities
 ALTER TABLE ONLY labels
     ADD CONSTRAINT fk_7de4989a69 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY backup_labels
-    ADD CONSTRAINT fk_7de4989a69 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
-
 ALTER TABLE ONLY merge_requests
     ADD CONSTRAINT fk_7e85395a64 FOREIGN KEY (sprint_id) REFERENCES sprints(id) ON DELETE CASCADE;
 
@@ -25974,9 +25939,6 @@ ALTER TABLE ONLY serverless_domain_cluster
 ALTER TABLE ONLY labels
     ADD CONSTRAINT fk_rails_c1ac5161d8 FOREIGN KEY (group_id) REFERENCES namespaces(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY backup_labels
-    ADD CONSTRAINT fk_rails_c1ac5161d8 FOREIGN KEY (group_id) REFERENCES namespaces(id) ON DELETE CASCADE;
-
 ALTER TABLE ONLY project_feature_usages
     ADD CONSTRAINT fk_rails_c22a50024b FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;