Exported review requests are save into file in json format, and this file can be imported to recreate review requests. Objects to b serialized are put in topological order based on dependencies.

Manually export and import review requests with/without local site to see the results.
Export all non local site review requests to a file.

Export all local sites to a file.

Export a single local site to a file.

Import all local sites and recreate local sites from a file.

Import all local sites without local sites (merge into global) from a file.

Import all non local site review requests from a file and create a local site for them.
One assumption is that no IntegrityError, ie no Users with same username, a file is not imported twice, etc.

Import is atomic transaction therefore IntegrityError leads to roll back.

init.py and json.py are from Django's built-in serializers.