Merge branch '341814_replace_namespaces_name_parent_unique_index' into 'master'

Replace namespaces unique index on name and parent_id

See merge request gitlab-org/gitlab!71390

db/migrate/20210922172056_add_unique_namespaces_index_on_name_parent_id_and_type.rb

+# frozen_string_literal: true
+
+class AddUniqueNamespacesIndexOnNameParentIdAndType < Gitlab::Database::Migration[1.0]
+  INDEX_NAME = 'index_namespaces_name_parent_id_type'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :namespaces, [:name, :parent_id, :type], unique: true, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name :namespaces, INDEX_NAME
+  end
+end

db/migrate/20210922172156_drop_unique_namespaces_index_on_name_and_parent_id.rb

+# frozen_string_literal: true
+
+class DropUniqueNamespacesIndexOnNameAndParentId < Gitlab::Database::Migration[1.0]
+  INDEX_NAME = 'index_namespaces_on_name_and_parent_id'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :namespaces, INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :namespaces, [:name, :parent_id], unique: true, name: INDEX_NAME
+  end
+end

db/schema_migrations/20210922172056

+c50ccd9986188356776c2d19c5544a6da6e31b5bb1b16ed259455604cb6fd862
\ No newline at end of file

db/schema_migrations/20210922172156

+083b18b8e687ae8ff9d93ee77c6d4fc2916a2f1b77acf44132f216236b0ff06c
\ No newline at end of file

db/structure.sql

@@ -25683,6 +25683,8 @@ CREATE INDEX index_namespaces_id_parent_id_is_not_null ON namespaces USING btree
 
 CREATE INDEX index_namespaces_id_parent_id_is_null ON namespaces USING btree (id) WHERE (parent_id IS NULL);
 
+CREATE UNIQUE INDEX index_namespaces_name_parent_id_type ON namespaces USING btree (name, parent_id, type);
+
 CREATE INDEX index_namespaces_on_created_at ON namespaces USING btree (created_at);
 
 CREATE INDEX index_namespaces_on_custom_project_templates_group_id_and_type ON namespaces USING btree (custom_project_templates_group_id, type) WHERE (custom_project_templates_group_id IS NOT NULL);
@@ -25693,8 +25695,6 @@ CREATE INDEX index_namespaces_on_ldap_sync_last_successful_update_at ON namespac
 
 CREATE INDEX index_namespaces_on_ldap_sync_last_update_at ON namespaces USING btree (ldap_sync_last_update_at);
 
-CREATE UNIQUE INDEX index_namespaces_on_name_and_parent_id ON namespaces USING btree (name, parent_id);
-
 CREATE INDEX index_namespaces_on_name_trigram ON namespaces USING gin (name gin_trgm_ops);
 
 CREATE INDEX index_namespaces_on_owner_id ON namespaces USING btree (owner_id);