优化数据库模型与关系

models/task.py

@@ -1,7 +1,7 @@
 # my_project/models/task.py
 
 from typing import Optional, TYPE_CHECKING
-from sqlmodel import Field, Relationship, Column, func, DateTime
+from sqlmodel import Field, Relationship, CheckConstraint
 from .base import TableBase
 from datetime import datetime
 
@@ -11,6 +11,10 @@ if TYPE_CHECKING:
 
 class Task(TableBase, table=True):
     __tablename__ = 'tasks'
+    __table_args__ = (
+        CheckConstraint("progress BETWEEN 0 AND 100", name="ck_task_progress_range"),
+    )
+
 
     status: int = Field(default=0, sa_column_kwargs={"server_default": "0"}, description="任务状态: 0=排队中, 1=处理中, 2=完成, 3=错误")
     type: int = Field(description="任务类型")
@@ -19,7 +23,7 @@ class Task(TableBase, table=True):
     props: Optional[str] = Field(default=None, description="任务属性 (JSON格式)")
     
     # 外键
-    user_id: "int" = Field(foreign_key="users.id", index=True, description="所属用户ID")
+    user_id: int = Field(foreign_key="users.id", index=True, description="所属用户ID")
     
     # 关系
     user: "User" = Relationship(back_populates="tasks")