prevent re-registrations using a deleted username - not an issue with Friendica but could create a serious privacy issue with federated platforms

update.php

@@ -1,6 +1,6 @@
 <?php
 
-define( 'UPDATE_VERSION' , 1132 );
+define( 'UPDATE_VERSION' , 1133 );
 
 /**
  *
@@ -1127,3 +1127,12 @@ function update_1131() {
 }
 
 
+function update_1132() {
+	q("CREATE TABLE IF NOT EXISTS `userd` (
+`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
+`username` CHAR( 255 ) NOT NULL,
+INDEX ( `username` )
+) ENGINE = MYISAM ");
+
+}
+