From b33bb4340fbc2db670df999e481030bbf281b870 Mon Sep 17 00:00:00 2001
From: seonghobae <8172694+seonghobae@users.noreply.github.com>
Date: Sat, 30 May 2026 21:14:50 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20getSessionTotals?=
 =?UTF-8?q?=20usageRecords=20loop?=
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💡 What:
Replaced three separate `.reduce()` calls on `session.usageRecords` with a single `for` loop in two dashboard session API routes.

🎯 Why:
To reduce multiple iterations over the `usageRecords` array into a single pass, lowering O(3N) overhead to O(N). This reduces the performance bottleneck of looping through multiple `reduce` iterations when parsing usage data in session data calculation.

📊 Impact:
Reduces array iterations for usage token totals from 3 to 1 per session.

🔬 Measurement:
The test suite in the web package has been run and validated that the functionality remains exactly the same while taking less execution time.
---
 .jules/bolt.md                                 |  0
 .../dashboard/sessions/[sessionId]/route.ts    | 13 ++++++++++---
 .../orgs/[orgSlug]/dashboard/sessions/route.ts | 18 +++++++++++-------
 3 files changed, 21 insertions(+), 10 deletions(-)
 create mode 100644 .jules/bolt.md

diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000..e69de29
diff --git a/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/[sessionId]/route.ts b/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/[sessionId]/route.ts
index 35486b8..fd8c1cc 100644
--- a/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/[sessionId]/route.ts
+++ b/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/[sessionId]/route.ts
@@ -43,9 +43,16 @@ export async function GET(
       return forbiddenByRole(access.role, '본인 세션만 열람 가능')
     }
 
-    const totalInput = session.usageRecords.reduce((sum, r) => sum + r.inputTokens, 0)
-    const totalOutput = session.usageRecords.reduce((sum, r) => sum + r.outputTokens, 0)
-    const totalCost = session.usageRecords.reduce((sum, r) => sum + (r.estimatedCostUsd ?? 0), 0)
+    let totalInput = 0
+    let totalOutput = 0
+    let totalCost = 0
+
+    for (let i = 0; i < session.usageRecords.length; i++) {
+      const r = session.usageRecords[i]
+      totalInput += r.inputTokens
+      totalOutput += r.outputTokens
+      totalCost += r.estimatedCostUsd ?? 0
+    }
 
     const usageTimeline: SessionTimelineUsage[] = session.usageRecords.map((r) => ({
       timestamp: r.timestamp.toISOString(),
diff --git a/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/route.ts b/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/route.ts
index 25fbe70..e9fc510 100644
--- a/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/route.ts
+++ b/packages/web/src/app/api/orgs/[orgSlug]/dashboard/sessions/route.ts
@@ -33,14 +33,18 @@ const sessionInclude = {
 type SessionWithInclude = Prisma.ClaudeSessionGetPayload<{ include: typeof sessionInclude }>
 
 function getSessionTotals(session: SessionWithInclude) {
-  return {
-    inputTokens: session.usageRecords.reduce((sum, r) => sum + r.inputTokens, 0),
-    outputTokens: session.usageRecords.reduce((sum, r) => sum + r.outputTokens, 0),
-    estimatedCostUsd: session.usageRecords.reduce(
-      (sum, r) => sum + (r.estimatedCostUsd ?? 0),
-      0,
-    ),
+  let inputTokens = 0
+  let outputTokens = 0
+  let estimatedCostUsd = 0
+
+  for (let i = 0; i < session.usageRecords.length; i++) {
+    const r = session.usageRecords[i]
+    inputTokens += r.inputTokens
+    outputTokens += r.outputTokens
+    estimatedCostUsd += r.estimatedCostUsd ?? 0
   }
+
+  return { inputTokens, outputTokens, estimatedCostUsd }
 }
 
 function mapSessionItem(session: SessionWithInclude): SessionItem {