from sqlalchemy import Column, String, DateTime
from sqlalchemy.sql import func
from core.database import Base
import uuid

class Book(Base):
    __tablename__ = "books"
    
    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
    title = Column(String, nullable=False, index=True)
    author = Column(String, nullable=False)
    description = Column(String)
    isbn = Column(String, unique=True)
    created_at = Column(DateTime, default=func.now())
    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())