Dump your database (originally designed for django + postgres) with anonymized data (auth_user,..).
This is more a gist than a final solution. Possible installation:
pip install faker
pip install pg_dump_anonymized
If you want just backup/anonymize the basic django auth solution (with auth_user table) using pg_dump then add into INSTALLED_APPS:
'pg_dump_anonymized',
and run:
./manage.py anonymized_dump_basic
If you need a different scenario you don't need change your INSTALLED_APPS. Instead find the installed package in the virtualenvironment and copy file to_management_commands/anonymized_dump.py to management/commands in the main application of your project (or copy this file from github).
Now
./manage.py anonymized_dump
should work exactly as the previous command, but this is not what you want. You need rewrite the anonymized_dump.Dump class - redefine methods from its parent class. To do that see pg_dump_anonymized.bk_anonymized.Dump class which methods you need redefine.