from pydantic import BaseModel
from typing import Optional


class ExchangeRateBaseDTO(BaseModel):
    date: int
    value: Optional[float]
    local_currency: Optional[str]
    foreign_currency: Optional[str]


class ExchangeRateCreateDTO(ExchangeRateBaseDTO):
    pass


class ExchangeRateResponseDTO(ExchangeRateBaseDTO):
    class Config:
        from_attributes = True