DRF Validating instance saved in database

I Have an issue with Django / DRF, I want to validate data already saved in database.

(it hasn't be fully validated before, because at the create / update of it, I am permissive and I want to allow the user to do certain things and correct it later)

But here's the thing: currently, in order to validate it, I have so serialize it, to have dict data, and then this data needs to go through a validation serializer.

But it seems a bit overkill and it also seems to have some issues in it (need to re-implement a full validation in addition of the create / update one, might not follow all the validation rules implemented somewhere else)

How could I do it ?

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