style(backend): apply ruff format

apps/backend/models/check_in_task.py

@@ -10,11 +10,27 @@ class CheckInTask(Base):
     __tablename__ = "check_in_tasks"
 
     id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True, comment="用户 ID")
-    payload_config = Column(Text, default="{}", nullable=False, comment="完整的 payload 配置 JSON（从模板生成，包含 ThreadId 和所有字段）")
+    user_id = Column(
+        Integer,
+        ForeignKey("users.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+        comment="用户 ID",
+    )
+    payload_config = Column(
+        Text,
+        default="{}",
+        nullable=False,
+        comment="完整的 payload 配置 JSON（从模板生成，包含 ThreadId 和所有字段）",
+    )
     name = Column(String(100), default="", comment="任务名称（用户自定义）")
     is_active = Column(Boolean, default=True, comment="是否启用自动打卡（不影响手动打卡）")
-    cron_expression = Column(String(100), default="0 20 * * *", nullable=True, comment="Crontab 表达式（NULL 表示禁用自动打卡，否则按表达式执行）")
+    cron_expression = Column(
+        String(100),
+        default="0 20 * * *",
+        nullable=True,
+        comment="Crontab 表达式（NULL 表示禁用自动打卡，否则按表达式执行）",
+    )
     created_at = Column(DateTime(timezone=True), server_default=func.now(), comment="创建时间")
     updated_at = Column(DateTime(timezone=True), onupdate=func.now(), comment="更新时间")
 
@@ -22,12 +38,14 @@ class CheckInTask(Base):
     user = relationship("User", back_populates="tasks")
 
     # 关联打卡记录
-    check_in_records = relationship("CheckInRecord", back_populates="task", cascade="all, delete-orphan")
+    check_in_records = relationship(
+        "CheckInRecord", back_populates="task", cascade="all, delete-orphan"
+    )
 
     # 添加索引：加速查询
     __table_args__ = (
-        Index('ix_task_user_active', 'user_id', 'is_active'),
-        Index('ix_task_cron', 'cron_expression'),  # 加速查询启用了定时打卡的任务
+        Index("ix_task_user_active", "user_id", "is_active"),
+        Index("ix_task_cron", "cron_expression"),  # 加速查询启用了定时打卡的任务
     )
 
     def __repr__(self):