48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
"""
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数据库模型定义
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"""
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from datetime import datetime
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from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, JSON
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import relationship
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Base = declarative_base()
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class Conversation(Base):
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"""对话记录表"""
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__tablename__ = "conversations"
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id = Column(Integer, primary_key=True, index=True)
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session_id = Column(String(64), nullable=False, index=True)
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user_id = Column(String(64), nullable=True)
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created_at = Column(DateTime, default=datetime.utcnow)
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# 关联消息
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messages = relationship("Message", back_populates="conversation", cascade="all, delete-orphan")
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class Message(Base):
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"""消息记录表"""
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__tablename__ = "messages"
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id = Column(Integer, primary_key=True, index=True)
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conversation_id = Column(Integer, ForeignKey("conversations.id"), nullable=False)
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role = Column(String(20), nullable=False) # 'user' or 'assistant'
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content = Column(Text, nullable=False)
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msg_metadata = Column(JSON, nullable=True) # 改名避免与SQLAlchemy保留字冲突
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created_at = Column(DateTime, default=datetime.utcnow)
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# 关联对话
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conversation = relationship("Conversation", back_populates="messages")
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class UserPreference(Base):
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"""用户偏好表"""
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__tablename__ = "user_preferences"
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id = Column(Integer, primary_key=True, index=True)
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user_id = Column(String(64), unique=True, nullable=False, index=True)
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preferences = Column(JSON, nullable=True)
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updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
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