优化

backend/models.py

@@ -429,3 +429,22 @@ class WatchlistItem(Base):
     sort_order: Mapped[int] = mapped_column(Integer, default=0)
     note: Mapped[str] = mapped_column(String(200), default="")  # 个股备注
     added_at: Mapped[dt.datetime] = mapped_column(DateTime, server_default=func.now())
+
+
+class ScheduledTask(Base):
+    """定时任务配置。"""
+    __tablename__ = "scheduled_tasks"
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    task_id: Mapped[str] = mapped_column(String(40), unique=True, index=True)  # 任务标识
+    name: Mapped[str] = mapped_column(String(80))  # 任务名称
+    description: Mapped[str] = mapped_column(String(200), default="")  # 描述
+    enabled: Mapped[bool] = mapped_column(default=True)  # 是否启用
+    schedule_type: Mapped[str] = mapped_column(String(20), default="cron")  # cron/interval
+    cron_expression: Mapped[str] = mapped_column(String(50), default="")  # cron表达式
+    interval_seconds: Mapped[int] = mapped_column(Integer, default=0)  # 间隔秒数
+    category: Mapped[str] = mapped_column(String(20), default="其他")  # 分类
+    last_run: Mapped[dt.datetime | None] = mapped_column(DateTime, nullable=True)  # 上次运行
+    run_count: Mapped[int] = mapped_column(Integer, default=0)  # 运行次数
+    last_status: Mapped[str] = mapped_column(String(20), default="")  # 上次状态
+    last_message: Mapped[str] = mapped_column(String(500), default="")  # 上次消息
+    created_at: Mapped[dt.datetime] = mapped_column(DateTime, server_default=func.now())