DB Locked error

2009-04-29 22:20:09,953 ERROR core.dispatcher: Exception occured in See processor of seen plugin
Traceback (most recent call last):
  File "/home/stefanor/projects/ibid/dc-source/ibid/core.py", line 22, in _process
    processor.process(event)
  File "/home/stefanor/projects/ibid/dc-source/ibid/plugins/seen.py", line 70, in process
    session.flush()
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/session.py", line 1351, in flush
    self._flush(objects)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/session.py", line 1422, in _flush
    flush_context.execute()
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/unitofwork.py", line 244, in execute
    UOWExecutor().execute(self, tasks)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/unitofwork.py", line 707, in execute
    self.execute_save_steps(trans, task)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/unitofwork.py", line 722, in execute_save_steps
    self.save_objects(trans, task)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/unitofwork.py", line 713, in save_objects
    task.mapper._save_obj(task.polymorphic_tosave_objects, trans)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/orm/mapper.py", line 1336, in _save_obj
    c = connection.execute(statement.values(value_params), params)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/engine/base.py", line 824, in execute
    return Connection.executors[c](self, object, multiparams, params)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/engine/base.py", line 874, in _execute_clauseelement
    return self.__execute_context(context)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/engine/base.py", line 896, in __execute_context
    self._cursor_execute(context.cursor, context.statement, context.parameters[0], context=context)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/engine/base.py", line 950, in _cursor_execute
    self._handle_dbapi_exception(e, statement, parameters, cursor, context)
  File "/usr/lib/pymodules/python2.5/sqlalchemy/engine/base.py", line 931, in _handle_dbapi_exception
    raise exc.DBAPIError.instance(statement, parameters, e, connection_invalidated=is_disconnect)
OperationalError: (OperationalError) database is locked u'UPDATE seen SET time=?, count=? WHERE seen.id = ?' ['2009-04-29 22:20:04.885087', 6,
657]