ALTER TABLE {$NAMESPACE}_conpherence.conpherence_thread
ADD viewPolicy VARBINARY(64) NOT NULL AFTER recentParticipantPHIDs;
UPDATE {$NAMESPACE}_conpherence.conpherence_thread
SET viewPolicy = 'users' WHERE viewPolicy = '';
ALTER TABLE {$NAMESPACE}_conpherence.conpherence_thread
ADD editPolicy VARBINARY(64) NOT NULL AFTER viewPolicy;
UPDATE {$NAMESPACE}_conpherence.conpherence_thread
SET editPolicy = 'users' WHERE editPolicy = '';
ALTER TABLE {$NAMESPACE}_conpherence.conpherence_thread
ADD joinPolicy VARBINARY(64) NOT NULL AFTER editPolicy;
UPDATE {$NAMESPACE}_conpherence.conpherence_thread
SET joinPolicy = 'users' WHERE joinPolicy = '';