python qwe.py 
/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py:1391: SAWarning: Usage of the 'Session.add()' operation is not currently supported within the execution stage of the flush process. Results may not be consistent.  Consider using alternative event listeners or connection-level operations instead.
  self._flush_warning("Session.add()")
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "qwe.py", line 91, in thread_call_manager
    call_manager(manager)
  File "qwe.py", line 80, in call_manager
    session.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 720, in commit
    self.transaction.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 353, in commit
    self._prepare_impl()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 333, in _prepare_impl
    self.session.flush()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1817, in flush
    self._flush(objects)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1895, in _flush
    subtransactions=True)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 644, in begin
    nested=nested)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 214, in _begin
    self._assert_active()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 181, in _assert_active
    "This session is in 'prepared' state; no further "
InvalidRequestError: This session is in 'prepared' state; no further SQL can be emitted within this transaction.

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "qwe.py", line 91, in thread_call_manager
    call_manager(manager)
  File "qwe.py", line 80, in call_manager
    session.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 720, in commit
    self.transaction.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 353, in commit
    self._prepare_impl()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 333, in _prepare_impl
    self.session.flush()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1817, in flush
    self._flush(objects)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1935, in _flush
    transaction.rollback(_capture_exception=True)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 61, in __exit__
    compat.reraise(type_, value, traceback)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1935, in _flush
    transaction.rollback(_capture_exception=True)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 369, in rollback
    self._assert_active(prepared_ok=True, rollback_ok=True)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 202, in _assert_active
    raise sa_exc.ResourceClosedError(closed_msg)
ResourceClosedError: This transaction is closed

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "qwe.py", line 91, in thread_call_manager
    call_manager(manager)
  File "qwe.py", line 80, in call_manager
    session.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 720, in commit
    self.transaction.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 365, in commit
    self.close()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 420, in close
    connection.close()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 585, in close
    del self.__connection
AttributeError: _Connection__connection

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "qwe.py", line 91, in thread_call_manager
    call_manager(manager)
  File "qwe.py", line 80, in call_manager
    session.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 720, in commit
    self.transaction.commit()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 365, in commit
    self.close()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 430, in close
    self.session.begin()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 651, in begin
    self, nested=nested)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 161, in __init__
    self._take_snapshot()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 237, in _take_snapshot
    self.session.flush()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1817, in flush
    self._flush(objects)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1935, in _flush
    transaction.rollback(_capture_exception=True)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 58, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1899, in _flush
    flush_context.execute()
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
    rec.execute(self)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 525, in execute
    uow
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 63, in save_obj
    table, insert)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 537, in _emit_insert_statements
    execute(statement, multiparams)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 662, in execute
    params)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 761, in _execute_clauseelement
    compiled_sql, distilled_params
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 874, in _execute_context
    context)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1024, in _handle_dbapi_exception
    exc_info
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 163, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 867, in _execute_context
    context)
  File "/home/dmitry/web/analytics/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 324, in do_execute
    cursor.execute(statement, parameters)
IntegrityError: (IntegrityError) duplicate key value violates unique constraint "manager_log_pkey"
DETAIL:  Key (id)=(1162) already exists.
 'INSERT INTO manager_log (id, direction, price, count, gain, date) VALUES (%(id)s, %(direction)s, %(price)s, %(count)s, %(gain)s, %(date)s)' {'count': 3, 'direction': 1, 'price': 10, 'gain': 0.1, 'date': datetime.datetime(2013, 5, 11, 20, 55, 16, 894727), 'id': 1162}

^CTraceback (most recent call last):
  File "qwe.py", line 121, in <module>
    execute_managers()
  File "qwe.py", line 107, in execute_managers
    queue_manager.put(manager)
  File "/usr/lib/python2.7/Queue.py", line 137, in put
    self.unfinished_tasks += 1
KeyboardInterrupt