|  | -- Copyright 2021 The Go Authors. All rights reserved. | 
|  | -- Use of this source code is governed by a BSD-style | 
|  | -- license that can be found in the LICENSE file. | 
|  |  | 
|  | BEGIN; | 
|  |  | 
|  | ALTER TABLE latest_module_versions ADD COLUMN status INTEGER DEFAULT 0 NOT NULL; | 
|  |  | 
|  | COMMENT ON COLUMN latest_module_versions.status IS | 
|  | 'COLUMN status holds the status of the operations used to determine latest versions.'; | 
|  |  | 
|  | ALTER TABLE latest_module_versions | 
|  | ADD COLUMN updated_at TIMESTAMP WITH TIME ZONE | 
|  | DEFAULT CURRENT_TIMESTAMP | 
|  | NOT NULL; | 
|  |  | 
|  | COMMENT ON COLUMN latest_module_versions.updated_at IS | 
|  | 'COLUMN updated_at tracks the time that the row was last changed.'; | 
|  |  | 
|  | CREATE TRIGGER set_updated_at BEFORE INSERT OR UPDATE ON latest_module_versions | 
|  | FOR EACH ROW EXECUTE PROCEDURE trigger_modify_updated_at(); | 
|  |  | 
|  | COMMENT ON TRIGGER set_updated_at ON latest_module_versions IS | 
|  | 'TRIGGER set_updated_at updates the value of the updated_at column to the current timestamp whenever a row is inserted or updated to the table.'; | 
|  |  | 
|  | CREATE INDEX idx_latest_module_versions_status ON latest_module_versions(status); | 
|  |  | 
|  | END; |