Adding not null OneToOneRelation (tortoise) not working

[JeffryCA]

Setup:

1. Create 2 models and db (postgres)
2. init migrations ...
3. add a fields.OneToOneRelation(..., null=False) to one of the models
4. migrate
5. upgrade

Results in: -- upgrade -- ALTER TABLE "table1" ADD "foreign_key" UUID NOT NULL UNIQUE; -- downgrade -- ALTER TABLE "table1" DROP COLUMN "foreign_key";

This however does not enforce the foreign key relationship to table 2! In other words one can add rows with unique random values without errors.