I am working on a system where the data is serialized using Python's pickle and stored in the database. Absolute nightmare for debugging as its basically unreadable.
Plus even if it did work, it involves logging into the server, activating my python virtualenv, pulling the data out via the python / Django shell an unpickling and printing it. As opposed to running a query on my local machine connecting to the database. When you are debugging a problem and just want to get an overview of what is happening, that is a hell of a lot of hassle.