初始版本

backend/app/models/todo.py

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+"""
+待办事项模型
+"""
+from datetime import datetime
+from typing import Optional
+from sqlmodel import SQLModel, Field, Relationship
+from .user import User
+
+
+class Todo(SQLModel, table=True):
+    """待办事项表"""
+    __tablename__ = "todos"
+    
+    id: Optional[int] = Field(default=None, primary_key=True)
+    title: str = Field(max_length=200)
+    done: bool = Field(default=False)
+    created_at: datetime = Field(default_factory=datetime.now)
+    user_id: int = Field(foreign_key="users.id", index=True)
+    
+    # 关系（可选，用于ORM查询）
+    user: Optional[User] = Relationship()
+