diff --git a/checkin_notes b/checkin_notes
index e3d3b74a4e..efb249d9c3 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -10170,3 +10170,13 @@ David  16 Dec 2008
 
     html/inc
         text_transform.inc
+
+David  16 Dec 2008
+    - web: added ops/autolock.php script;
+        locks threads not modified in last 60 days
+
+    html/
+        inc/
+            db_conn.inc
+        ops/
+            autolock.php
diff --git a/html/inc/db_conn.inc b/html/inc/db_conn.inc
index a8f11dd9fd..1392d3f308 100644
--- a/html/inc/db_conn.inc
+++ b/html/inc/db_conn.inc
@@ -50,6 +50,10 @@ class DbConn {
         return $ret;
     }
 
+    function affected_rows() {
+        return mysql_affected_rows($this->db_conn);
+    }
+
     function lookup_fields($table, $classname, $fields, $clause) {
         $query = "select $fields from DBNAME.$table where $clause";
         $result = $this->do_query($query);
diff --git a/html/ops/autolock.php b/html/ops/autolock.php
new file mode 100755
index 0000000000..7eeb68c60c
--- /dev/null
+++ b/html/ops/autolock.php
@@ -0,0 +1,36 @@
+#!/usr/bin/env php
+<?php
+// This file is part of BOINC.
+// http://boinc.berkeley.edu
+// Copyright (C) 2008 University of California
+//
+// BOINC is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License
+// as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// BOINC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
+
+// lock all threads older than N days
+
+require_once("../inc/boinc_db.inc");
+require_once("../inc/util.inc");
+
+$max_age_days = 60;     // lock threads older than this
+
+$t = time_str(time());
+echo "starting at $t\n";
+$t = time() - $max_age_days*86400;
+$db = BoincDb::get();
+if (!$db) die("can't open DB\n");
+$db->do_query("update DBNAME.thread set locked=1 where timestamp<$t and locked=0 and sticky=0");
+$n = $db->affected_rows();
+$t = time_str(time());
+echo "finished at $t; locked $n threads\n";
+?>