OTOMH (I didn't go through your code), are the two databases the same?

If not, this is possibly related to database specific compiling (or the 
lack of) and a common error.  Note the `bind` references in the 
docs: http://docs.sqlalchemy.org/en/latest/core/tutorial.html#executing 
 Depending on how you invoke a select, the statement will either be 
compiled as a generic string or sqlalchemy knows that it should be 
customized for the specific database.  Depending on the database, the 
generic version will or will not work.  This might not be happening -- I 
didn't go through your code -- but many situations of "It works when I ___ 
but not when I ____" are related to this.

-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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