import uuid
from datetime import datetime

from sqlalchemy import func
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class TimestampMixin:
    created_at: Mapped[datetime] = mapped_column(server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(server_default=func.now(), onupdate=func.now())


class UUIDPrimaryKey:
    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)