# -*- coding: utf-8 -*-
"""知识点实体（与 knowledge_points 表对应）"""
from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime

from backend.database import Base


class KnowledgePoint(Base):
    __tablename__ = "knowledge_points"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String(100), unique=True, nullable=False)
    description = Column(Text, nullable=True)
    chapter = Column(String(80), nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow)