look at example

from pydantic import BaseModel


class A(BaseModel):
    a: float = 0.0


class B(A):
    b: float = 0.0


class C(A):
    c: float = 0.0


b = B(a=1.1, b=2.2)
b_json = b.model_dump_json()

So I have two classes B, C which have a parent A. Here json of B instance is created and then goes somewhere in DB etc. When I take this json in some other time (from DB etc) I need to guess what class it was to correctly parse and deserialize like

B.parse_raw(b_json) # instead C.parse_raw(b_json)

Is there some good practice how to achieve this? Maybe keep some additional information? Or JSON serialization / pydantic not fit well for such purposes ?