Comment 14 for bug 1160442

When setting the timeout to a value that is very small then the problem does not occur. for example:
_ENGINE = create_engine(sql_connection, pool_timeout=2, **engine_args)
In addition to this when the I increase the pool size and add in a overflow size the problem does not occur

For a temporary fix we can add the following configuration parameters:
   - pool_size
   - max_overflow
   - pool_timeout

I'll do this tomorrow