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- # -*- coding: utf-8 -*-
- """错题集：用户在某题答错的聚合记录（用于错题→变式题闭环）"""
- from datetime import datetime
- from sqlalchemy import Column, DateTime, ForeignKey, Integer, UniqueConstraint
- from backend.database import Base
- class WrongQuestion(Base):
- __tablename__ = "wrong_questions"
- __table_args__ = (
- UniqueConstraint("user_id", "question_id", name="uk_user_wrong_question"),
- )
- id = Column(Integer, primary_key=True, index=True)
- user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
- question_id = Column(Integer, ForeignKey("questions.id"), nullable=False, index=True)
- wrong_count = Column(Integer, default=0)
- last_wrong_at = Column(DateTime, nullable=True)
- created_at = Column(DateTime, default=datetime.utcnow)
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