Documents for my presantation which I did during PyCon SG 2015
https://pycon.sg/schedule/presentation/60/
When your aplication becomes a bit messy and you have a lot of points of entry to it with many sources of truth - maybe it is time to think about pushing you business logic to PostgreSQL?
During my talk I am not trying to convince you to stop using ORM at all. This is more like a showing the "other side" of truth if we think about data processing with python and database.
To download examples please clone below repository
https://github.com/darkman66/postgresql_and_python
copy of slides
http://www.slideshare.net/DJTechHub/business-logic-with-postgre-sql-and-python