Debug Python 2.7 script

Avg Bid (GBP)
Project Budget (GBP)
£20 - £250

Project Description:
I have a small server-side script that is wroking fine when a single user is logged in, but when multiple users access the system I m getting exceptions from the MySQL connection as shown below:

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.6/", line 532, in __bootstrap_inner
File "", line 73, in run
process_message(self.node, self.skts, self.cfg, self.enc, data_in)
File "", line 149, in process_message
rc = process_decrypted(node, skts, cfg, enc, message)
File "", line 279, in process_decrypted
return reply
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 354, in __exit__
if exc_type is None: commit() # exc_value can be None in Python 2.6 even if exc_type is not None
File "<string>", line 2, in commit
File "/usr/local/lib/python2.6/dist-packages/pony/", line 96, in cut_traceback
return func(*args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 269, in commit
reraise(CommitException, exceptions)
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 263, in commit
try: primary_cache.commit()
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 3657, in commit
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 3720, in save
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 3591, in _save_
elif status == 'updated': obj._save_updated_()
File "/usr/local/lib/python2.6/dist-packages/pony/orm/", line 3522, in _save_updated_
throw(UnrepeatableReadError, 'Object %s was updated outside of current transaction' % safe_repr(obj))
File "/usr/local/lib/python2.6/dist-packages/pony/", line 123, in throw
raise exc
CommitException: Object node[2] was updated outside of current transaction

I am looking for someone who can help debug this. Debugging would need to occur "in-situ" and login details to the server will be provided.

Additional Project Description:
03/05/2014 at 7:44 AKST
The MySQL connections are handled by PonyORM but I am happy for this to change to a pure MySQL connection if desired.

The code is currently less than 350 lines so should be considered an easy project by any Python professionals.

03/06/2014 at 4:58 AKST
I am happy to move the Django if this is helpful in ensuring a reliable solution.

Skills required:
Django, MySQL, Python
About the employer:
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