from datetime import datetime

from sqlalchemy import FLOAT, INTEGER, TIMESTAMP, CheckConstraint, func
from sqlalchemy.orm import Mapped, mapped_column

from db.base import Base


class PricingConfig(Base):
    __tablename__ = "pricing_configs"

    __table_args__ = (CheckConstraint("id = 1", name="single_row_check"),)

    id: Mapped[int] = mapped_column(
        INTEGER, autoincrement=True, unique=True, nullable=False, primary_key=True
    )
    device_price: Mapped[float] = mapped_column(FLOAT, nullable=False)

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