.forge/iss-5a912ed79baf-attempt-3.md

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-# iss-5a912ed79baf-attempt-3
-
-Forge 이슈 작업 브랜치 `forge/iss-5a912ed79baf-attempt-3`.

docs/architecture/transaction-sequence.md

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-```mermaid
-sequenceDiagram
-    participant User
-    participant PaymentService
-    participant PaymentGateway
-    participant Database
-
-    %% Normal Flow
-    User->>PaymentService: Initiate Payment
-    PaymentService->>Database: Store Transaction
-    Database-->>PaymentService: Transaction Stored
-    PaymentService->>PaymentGateway: Process Payment
-    PaymentGateway-->>PaymentService: Payment Success
-    PaymentService->>Database: Update Transaction Status
-    Database-->>PaymentService: Transaction Updated
-    PaymentService-->>User: Payment Success
-
-    %% External Failure Flow
-    User->>PaymentService: Initiate Payment
-    PaymentService->>Database: Store Transaction
-    Database-->>PaymentService: Transaction Stored
-    PaymentService->>PaymentGateway: Process Payment
-    PaymentGateway-->>PaymentService: Payment Failure
-    PaymentService->>Database: Rollback Transaction
-    Database-->>PaymentService: Transaction Rolled Back
-    PaymentService-->>User: Payment Failure
-
-    %% DB Failure Flow
-    User->>PaymentService: Initiate Payment
-    PaymentService->>Database: Store Transaction
-    Database-->>PaymentService: Transaction Store Failure
-    PaymentService-->>User: Payment Failure
-
-    %% Commit & Rollback
-    Note over User, PaymentService: 
-    commit --> PaymentService
-    rollback --> PaymentService
-```