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

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