We "define" the model in a separate package - all the classes and 
relationships are in there. There are database support items as well, and 
some of the advanced/business logic that manipulate the ORM objects.  By 
advanced-database-specific logic, an example might be: resetting a password 
is a function that checks the existing password against current & past 
ones, updates the current credentials table, and migrates a consumed 
credential into a table of invalid previously used options - it's a 
multi-step database update.   

The webapps typically have a "model" namespace, but that just invokes the 
'shared' model package and contains any application/implementation specific 
model logic.  Everything is written so it can be easily migrated into the 
shared model package so all of the coordinated apps/utilities can leverage 
it.

This is just a personal preference my I have gravitated towards with my 
team over the past few years.  We've just never built a MVC app where the 
model only serves a single app after a few months.  There are always new 
tools/services/etc needed and this approach keeps everything centralized... 
especially many of the test suites.  One "project" was originally a Pyramid 
app that has grown to also be a Celery Utility, Twisted Daemon with 9 
services, and about 50 python tools. They all use a central SqlAlchemy 
model.

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

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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