From a61ca7b3d2e55a05f7874a55c86230827751e0eb Mon Sep 17 00:00:00 2001
From: forge-bot <bot@forge.local>
Date: Sun, 12 Jul 2026 07:51:36 +0000
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 docs/architecture/transaction-sequence.md | 24 +++++++++++++++++++++++
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 create mode 100644 docs/architecture/transaction-sequence.md

diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
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+```mermaid
+sequenceDiagram
+    participant User
+    participant PaymentGateway
+    participant Application
+    participant Database
+    User->>Application: Initiate Payment
+    Application->>PaymentGateway: Process Payment
+    alt Successful Payment
+        PaymentGateway-->>Application: Payment Approved
+        Application->>Database: Commit Transaction
+        Database-->>Application: Transaction Committed
+        Application-->>User: Payment Successful
+    else External Failure
+        PaymentGateway-->>Application: Payment Error
+        Application-->>User: Payment Failed
+    else DB Failure
+        Application->>Database: Attempt Transaction
+        Database-->>Application: Transaction Error
+        Application->>Database: Rollback Transaction
+        Database-->>Application: Transaction Rolled Back
+        Application-->>User: Payment Failed
+    end
+```
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