schema/cassandra/visibility/versioned/v0.4/add_memo.cql (6 lines of code) (raw):

ALTER TABLE open_executions ADD memo blob; ALTER TABLE closed_executions ADD memo blob; ALTER TABLE closed_executions_v2 ADD memo blob; ALTER TABLE open_executions ADD encoding text; ALTER TABLE closed_executions ADD encoding text; ALTER TABLE closed_executions_v2 ADD encoding text;