diff -r 9767cc516b4f -r 083b4d454192 hooks/__init__.py
--- a/hooks/__init__.py	Wed Mar 10 16:07:24 2010 +0100
+++ b/hooks/__init__.py	Mon Mar 01 11:26:14 2010 +0100
@@ -1,1 +1,36 @@
-"""core hooks"""
+"""core hooks
+
+:organization: Logilab
+:copyright: 2009-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
+:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
+:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
+"""
+__docformat__ = "restructuredtext en"
+
+from datetime import timedelta, datetime
+from cubicweb.server import hook
+
+class ServerStartupHook(hook.Hook):
+    """task to cleanup expirated auth cookie entities"""
+    __regid__ = 'cw_cleanup_transactions'
+    events = ('server_startup',)
+
+    def __call__(self):
+        # XXX use named args and inner functions to avoid referencing globals
+        # which may cause reloading pb
+        lifetime = timedelta(days=self.repo.config['keep-transaction-lifetime'])
+        def cleanup_old_transactions(repo=self.repo, lifetime=lifetime):
+            mindate = datetime.now() - lifetime
+            session = repo.internal_session()
+            try:
+                session.system_sql(
+                    'DELETE FROM transaction WHERE tx_time < %(time)s',
+                    {'time': mindate})
+                # cleanup deleted entities
+                session.system_sql(
+                    'DELETE FROM deleted_entities WHERE dtime < %(time)s',
+                    {'time': mindate})
+                session.commit()
+            finally:
+                session.close()
+        self.repo.looping_task(60*60*24, cleanup_old_transactions, self.repo)