19 lines
863 B
Python
19 lines
863 B
Python
"""单条消息（仅存 public 可见内容，隔离内部信息）。"""
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from datetime import datetime
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from sqlalchemy import String, Text, DateTime, ForeignKey
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from app.models.base import Base
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class Message(Base):
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__tablename__ = "messages"
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id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
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session_id: Mapped[int] = mapped_column(ForeignKey("chat_sessions.id", ondelete="CASCADE"), nullable=False, index=True)
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role: Mapped[str] = mapped_column(String(16), nullable=False) # user / assistant / system
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content: Mapped[str] = mapped_column(Text, nullable=False)
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created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=datetime.utcnow)
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session: Mapped["ChatSession"] = relationship("ChatSession", back_populates="messages")
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