Use mongodb instead of MySQL for user UIDs tracking

Sources/Load.php

@@ -75,6 +75,7 @@ function loadUserSettings()
 {
 	global $modSettings, $user_settings;
 	global $ID_MEMBER, $db_prefix, $cookiename, $user_info, $language;
+	global $mongodb;
 
 	// Check first the cookie, then the session.
 	if (isset($_COOKIE[$cookiename]))
@@ -149,9 +150,11 @@ function loadUserSettings()
 			);
 
 		$__uid = str_replace("uid=","",$_SERVER['USERID']);
-		db_query("
-			INSERT IGNORE INTO smf_member_uids VALUES('{$ID_MEMBER}', '{$__uid}')",
-			__FILE__, __LINE__);
+                $mongodb->rock->memberUids->update(
+                        array('member' => $ID_MEMBER),
+                        array('$addToSet' => array('uids' => $__uid)),
+                        array('upsert' => true)
+                );
 
 	}
 	// If the user is a guest, initialize all the critial user settings.