53 lines
2.3 KiB
Python
53 lines
2.3 KiB
Python
# File: backend/app/db/models.py (New - Database models)
|
|
# Description: SQLAlchemy ORM 模型定义
|
|
|
|
from sqlalchemy import Column, String, Float, ForeignKey, Text, DateTime, Integer
|
|
from sqlalchemy.orm import relationship
|
|
from sqlalchemy.sql import func # For default timestamps
|
|
from app.db.database import Base
|
|
import uuid
|
|
from datetime import datetime, timezone
|
|
|
|
def generate_uuid():
|
|
return str(uuid.uuid4())
|
|
|
|
class AssistantModel(Base):
|
|
__tablename__ = "assistants"
|
|
|
|
id = Column(String, primary_key=True, default=generate_uuid)
|
|
name = Column(String(50), nullable=False, index=True)
|
|
description = Column(String(200), nullable=True)
|
|
avatar = Column(String(5), nullable=True)
|
|
system_prompt = Column(Text, nullable=False)
|
|
model = Column(String, nullable=False)
|
|
temperature = Column(Float, nullable=False, default=0.7)
|
|
created_at = Column(DateTime(timezone=True), server_default=func.now())
|
|
updated_at = Column(DateTime(timezone=True), onupdate=func.now())
|
|
|
|
sessions = relationship("SessionModel", back_populates="assistant", cascade="all, delete-orphan")
|
|
|
|
class SessionModel(Base):
|
|
__tablename__ = "sessions"
|
|
|
|
id = Column(String, primary_key=True, default=generate_uuid)
|
|
title = Column(String(100), nullable=False, default="New Chat")
|
|
assistant_id = Column(String, ForeignKey("assistants.id"), nullable=False, index=True)
|
|
created_at = Column(DateTime(timezone=True), server_default=func.now())
|
|
updated_at = Column(DateTime(timezone=True), onupdate=func.now(), index=True) # Index for sorting
|
|
|
|
assistant = relationship("AssistantModel", back_populates="sessions")
|
|
messages = relationship("MessageModel", back_populates="session", cascade="all, delete-orphan", order_by="MessageModel.created_at") # Order messages by time
|
|
|
|
class MessageModel(Base):
|
|
__tablename__ = "messages"
|
|
|
|
id = Column(String, primary_key=True, default=generate_uuid)
|
|
session_id = Column(String, ForeignKey("sessions.id"), nullable=False, index=True)
|
|
sender = Column(String(10), nullable=False) # 'user' or 'ai' or 'system'
|
|
text = Column(Text, nullable=False)
|
|
order = Column(Integer, nullable=False) # Explicit order within session
|
|
created_at = Column(DateTime(timezone=True), server_default=func.now())
|
|
|
|
session = relationship("SessionModel", back_populates="messages")
|
|
|