from sqlalchemy import Column, String, Integer, ForeignKey, DateTime from sqlalchemy.orm import relationship from sqlalchemy.sql import func from core.database import Base import uuid class Book(Base): __tablename__ = "books" id = Column(Integer, primary_key=True, index=True) title = Column(String, nullable=False) author = Column(String, nullable=False, index=True) description = Column(String, nullable=True) page_count = Column(Integer, nullable=False) published_date = Column(DateTime, nullable=False) isbn = Column(String, unique=True, nullable=False, index=True) created_at = Column(DateTime, default=func.now()) updated_at = Column(DateTime, default=func.now(), onupdate=func.now())