from sqlalchemy import Column, String, Integer, DateTime, ForeignKey from sqlalchemy.dialects.postgresql import UUID from sqlalchemy.orm import relationship from sqlalchemy.sql import func from core.database import Base import uuid class Author(Base): __tablename__ = "authors" id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4) name = Column(String, nullable=False) books = relationship("Book", back_populates="authors") class Book(Base): __tablename__ = "books" id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4) title = Column(String, nullable=False) description = Column(String, nullable=True) year_published = Column(Integer, nullable=False) created_at = Column(DateTime, default=func.now()) updated_at = Column(DateTime, default=func.now(), onupdate=func.now()) author_id = Column(UUID, ForeignKey("authors.id"), nullable=False) authors = relationship("Author", back_populates="books")