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if some models within old_app have a custom db_table attribute the last step related to ALTER TABLE commands fails because the tables names are built from model name following the standard name assigned by django.
This update add the support of -m or --map-new-tab-name option which can be used to set mapping from old table names to new ones only for those with a custom name. Something like:
python manage.py rename_app <old_app_name> <new_app_name> -m "<old_tab_1>=<new_tab_1>" "<old_tab_2>=<new_tab_2>"