from __future__ import annotations
import uuid
from abc import ABC, abstractmethod
from typing import Generic, TypeVar, Optional

T = TypeVar("T")

class BaseRepository(ABC, Generic[T]):
    @abstractmethod
    async def find_by_id(self, entity_id: uuid.UUID) -> Optional[T]: ...

    @abstractmethod
    async def find_all(self) -> list[T]: ...

    @abstractmethod
    async def save(self, entity: T) -> T: ...

    @abstractmethod
    async def delete(self, entity_id: uuid.UUID) -> None: ...