ALTER TABLE {$NAMESPACE}_differential.differential_comment
ADD metadata LONGBLOB NOT NULL;
UPDATE {$NAMESPACE}_differential.differential_comment
SET metadata = '{}' WHERE metadata = '';
ALTER TABLE {$NAMESPACE}_maniphest.maniphest_transaction
ADD metadata LONGBLOB NOT NULL;
UPDATE {$NAMESPACE}_maniphest.maniphest_transaction
SET metadata = '{}' WHERE metadata = '';