fix(coding-agent): make session path traversal linear

Avoid quadratic path construction when walking deep session branches. On a 600k-entry pathological session, path construction improved from about 20.3s with Array.unshift() to about 35ms with push() plus reverse(). Refs #5804.
2026-06-20 20:22:53 +02:00
parent 8597ebafd9
commit a1da88aed4
2 changed files with 5 additions and 2 deletions
@@ -357,9 +357,10 @@ export function buildSessionContext(
 	const path: SessionEntry[] = [];
 	let current: SessionEntry | undefined = leaf;
 	while (current) {
-		path.unshift(current);
+		path.push(current);
 		current = current.parentId ? byId.get(current.parentId) : undefined;
 	}
+	path.reverse();

 	// Extract settings and find compaction
 	let thinkingLevel = "off";
@@ -1152,9 +1153,10 @@ export class SessionManager {
 		const startId = fromId ?? this.leafId;
 		let current = startId ? this.byId.get(startId) : undefined;
 		while (current) {
-			path.unshift(current);
+			path.push(current);
 			current = current.parentId ? this.byId.get(current.parentId) : undefined;
 		}
+		path.reverse();
 		return path;
 	}