From 030594e7cf1df27323d405824fcd577f3064c35e Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 30 Jun 2026 20:56:46 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20session=20archiv?=
 =?UTF-8?q?ing=20cleanup?=
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Content-Type: text/plain; charset=UTF-8
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---
 .jules/bolt.md                             |  3 +++
 src/core/session/manager.ts                | 15 +++++++++++----
 tests/integration/prompt_templates.test.ts |  4 +++-
 3 files changed, 17 insertions(+), 5 deletions(-)
 create mode 100644 .jules/bolt.md

diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 00000000..4d49278f
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2024-07-01 - Avoid Array.find() inside chunked loops
+**Learning:** In `ChatSessionManager.performAutoCleanup()`, mapping over chunks to archive sessions performs `sessions.find((s) => s.meta.id === sessionId)` inside the map callback. `sessions` is the full array of sessions. This results in O(M * N) complexity (where M is number of sessions to archive, N is total sessions). Worse, since it happens inside `Promise.all()`, it causes many redundant iterations. And in `evictExpiredEntries()` and `evictLruIfNeeded()` in `ContextService`, we already know about avoiding O(N^2) regressions by reusing entry objects obtained during initial iterations or just creating maps.
+**Action:** When mapping array of IDs to full objects, always create a Map lookup beforehand (O(N)) or reuse objects from earlier filtering.
diff --git a/src/core/session/manager.ts b/src/core/session/manager.ts
index 69a5bfb2..2335df39 100644
--- a/src/core/session/manager.ts
+++ b/src/core/session/manager.ts
@@ -377,15 +377,22 @@ export class ChatSessionManager {
     }
 
     // Archive medium-priority sessions
+    const sessionMap = new Map(sessions.map((s) => [s.meta.id, s]));
     for (let i = 0; i < analysis.sessionsToArchive.length; i += CHUNK_SIZE) {
       const chunk = analysis.sessionsToArchive.slice(i, i + CHUNK_SIZE);
       await Promise.all(
         chunk.map(async (sessionId) => {
-          const session = sessions.find((s) => s.meta.id === sessionId);
+          const session = sessionMap.get(sessionId);
           if (session) {
-            await this.archiveSession(session);
-            await this.deleteSession(sessionId);
-            archived++;
+            try {
+              await this.archiveSession(session);
+              await this.deleteSession(sessionId);
+              archived++;
+            } catch (err) {
+              getLogger().warn(
+                `[SessionManager] Failed to archive session ${sessionId}: ${err instanceof Error ? err.message : String(err)}`,
+              );
+            }
           }
         }),
       );
diff --git a/tests/integration/prompt_templates.test.ts b/tests/integration/prompt_templates.test.ts
index 21905259..f1360d78 100644
--- a/tests/integration/prompt_templates.test.ts
+++ b/tests/integration/prompt_templates.test.ts
@@ -36,7 +36,9 @@ describe('Prompt templates', () => {
 
     expect(planSystem).toContain('You are SalmonLoop.');
     expect(patchSystem).toContain('You are PATCH, a phase-native diff compiler.');
-    expect(autopilotSystem).toContain('You are a senior software engineer running in "autopilot" mode.');
+    expect(autopilotSystem).toContain(
+      'You are a senior software engineer running in "autopilot" mode.',
+    );
     expect(answerSystem).toContain('You are a coding assistant in "answer" mode.');
     expect(researchSystem).toContain('You are a research assistant.');
   });