# -*- coding: utf-8 -*-
"""答疑会话：记录用户与数字人的问答历史"""
from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey

from backend.database import Base


class QASession(Base):
    __tablename__ = "qa_sessions"
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    question = Column(Text, nullable=False)
    answer = Column(Text, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow)