Some time in the past I could leave my app running overnight and come  
back in the morning and everything worked fine. More recently that  
stopped working (around SVN r1840 maybe?). Now I get a "connection  
not open" error. Here's the trace:

...
   File ".../sqlalchemy/attributes.py", line 32, in __get__
     return self.get(obj)
   File ".../sqlalchemy/attributes.py", line 175, in get
     value = callable_()
   File ".../sqlalchemy/orm/properties.py", line 417, in lazyload
     return self.mapper.using(session).get(ident)
   File ".../sqlalchemy/orm/query.py", line 44, in get
     return self._get(key, ident, **kwargs)
   File ".../sqlalchemy/orm/query.py", line 297, in _get
     return self._select_statement(statement, params=params,  
populate_existing=reload)[0]
   File ".../sqlalchemy/orm/query.py", line 305, in _select_statement
     return self.instances(statement, params=params, **kwargs)
   File ".../sqlalchemy/orm/query.py", line 267, in instances
     result = self.session.execute(self.mapper, clauseelement,  
params=params)
   File ".../sqlalchemy/orm/session.py", line 114, in execute
     return self.connection(mapper, close_with_result=True).execute 
(clause, params, **kwargs)
   File ".../sqlalchemy/engine/base.py", line 246, in execute
     return Connection.executors[type(object).__mro__[-2]](self,  
object, *multiparams, **params)
   File ".../sqlalchemy/engine/base.py", line 270, in  
execute_clauseelement
     return self.execute_compiled(elem.compile(engine=self.__engine,  
parameters=param), *multiparams, **params)
   File ".../sqlalchemy/engine/base.py", line 288, in execute_compiled
     return ResultProxy(self.__engine, self, cursor, context,  
typemap=compiled.typemap)
OperationalError: connection not open

I noticed that some work has been done on the connection pool  
recently, so maybe that has something to do with it. Let me know if I  
can help to find the problem.

~ Daniel

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