text: from sqlalchemy import Column, Integer, String
  from sqlalchemy.orm import relationship
  
  from app.database import Base
  
  class Item(Base):
      __tablename__ = "Items"
  
      id = Column(Integer, primary_key=True, index=True)
      name = Column(String(50), nullable=False, unique=True)
      quantity = Column(Integer, nullable=False, default=0)
  