fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解

backend/subscription_manager.py

@@ -21,6 +21,7 @@ from typing import Any
 
 logger = logging.getLogger(__name__)
 
+
 class SubscriptionStatus(StrEnum):
     """订阅状态"""
 
@@ -31,6 +32,7 @@ class SubscriptionStatus(StrEnum):
     TRIAL = "trial"  # 试用中
     PENDING = "pending"  # 待支付
 
+
 class PaymentProvider(StrEnum):
     """支付提供商"""
 
@@ -39,6 +41,7 @@ class PaymentProvider(StrEnum):
     WECHAT = "wechat"  # 微信支付
     BANK_TRANSFER = "bank_transfer"  # 银行转账
 
+
 class PaymentStatus(StrEnum):
     """支付状态"""
 
@@ -49,6 +52,7 @@ class PaymentStatus(StrEnum):
     REFUNDED = "refunded"  # 已退款
     PARTIAL_REFUNDED = "partial_refunded"  # 部分退款
 
+
 class InvoiceStatus(StrEnum):
     """发票状态"""
 
@@ -59,6 +63,7 @@ class InvoiceStatus(StrEnum):
     VOID = "void"  # 作废
     CREDIT_NOTE = "credit_note"  # 贷项通知单
 
+
 class RefundStatus(StrEnum):
     """退款状态"""
 
@@ -68,6 +73,7 @@ class RefundStatus(StrEnum):
     COMPLETED = "completed"  # 已完成
     FAILED = "failed"  # 失败
 
+
 @dataclass
 class SubscriptionPlan:
     """订阅计划数据类"""
@@ -86,6 +92,7 @@ class SubscriptionPlan:
     updated_at: datetime
     metadata: dict[str, Any]
 
+
 @dataclass
 class Subscription:
     """订阅数据类"""
@@ -106,6 +113,7 @@ class Subscription:
     updated_at: datetime
     metadata: dict[str, Any]
 
+
 @dataclass
 class UsageRecord:
     """用量记录数据类"""
@@ -120,6 +128,7 @@ class UsageRecord:
     description: str | None
     metadata: dict[str, Any]
 
+
 @dataclass
 class Payment:
     """支付记录数据类"""
@@ -141,6 +150,7 @@ class Payment:
     created_at: datetime
     updated_at: datetime
 
+
 @dataclass
 class Invoice:
     """发票数据类"""
@@ -164,6 +174,7 @@ class Invoice:
     created_at: datetime
     updated_at: datetime
 
+
 @dataclass
 class Refund:
     """退款数据类"""
@@ -186,6 +197,7 @@ class Refund:
     created_at: datetime
     updated_at: datetime
 
+
 @dataclass
 class BillingHistory:
     """账单历史数据类"""
@@ -201,6 +213,7 @@ class BillingHistory:
     created_at: datetime
     metadata: dict[str, Any]
 
+
 class SubscriptionManager:
     """订阅与计费管理器"""
 
@@ -2187,9 +2200,11 @@ class SubscriptionManager:
             metadata=json.loads(row["metadata"] or "{}"),
         )
 
+
 # 全局订阅管理器实例
 subscription_manager = None
 
+
 def get_subscription_manager(db_path: str = "insightflow.db") -> SubscriptionManager:
     """获取订阅管理器实例（单例模式）"""
     global subscription_manager