1. generate an empty migration
2. move the migration from `old_app` to `new_app`
3. edit the migration file to change all instances of `old_app` to `new_app`
4. add a forward migration to rename the table from `something` to `something_else`
5. add a backward migration to do the opposite
6. move models.py from `old_app` to `new_app`
7. apply the migration