foreach ( $this->timestamps as $ns => $dbks ) {
foreach ( $dbks as $dbk => $oldTimestamp ) {
$newTimestamp = $newTimestamps[$ns][$dbk];
foreach ( $this->timestamps as $ns => $dbks ) {
foreach ( $dbks as $dbk => $oldTimestamp ) {
$newTimestamp = $newTimestamps[$ns][$dbk];