feat: Add Book model

models/book.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, String, Integer, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from sqlalchemy.dialects.postgresql import UUID
+from core.database import Base
+import uuid
+
+class Book(Base):
+    __tablename__ = "books"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    title = Column(String, nullable=False)
+    author = Column(String, nullable=False)
+    description = Column(String, nullable=True)
+    page_count = Column(Integer, nullable=False)
+    genre = Column(String, nullable=False)
+    publisher_id = Column(UUID(as_uuid=True), ForeignKey("publishers.id"), nullable=False)
+
+    publisher = relationship("Publisher", back_populates="books")
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())