Bound shared query and catalog context retention

src/app-server/query/cache.ts

@@ -32,6 +32,7 @@ import { cloneModelMetadata, cloneSharedServerMetadata, cloneThreads } from "./s
 const THREAD_LIST_STALE_TIME_MS = 10_000;
 const APP_SERVER_METADATA_STALE_TIME_MS = 10_000;
 const MODELS_STALE_TIME_MS = 60_000;
+const APP_SERVER_QUERY_GC_TIME_MS = 5 * 60_000;
 
 export interface AppServerQueryClientRunner {
   runWithClient<T>(
@@ -388,7 +389,7 @@ function createAppServerQueryClient(): QueryClient {
   return new QueryClient({
     defaultOptions: {
       queries: {
-        gcTime: Infinity,
+        gcTime: APP_SERVER_QUERY_GC_TIME_MS,
         retry: false,
         refetchOnReconnect: false,
         refetchOnWindowFocus: false,

src/features/threads/catalog/thread-catalog.ts

@@ -2,6 +2,7 @@ import type { ObservedResultListener } from "../../../app-server/query/observed-
 import type { Thread } from "../../../domain/threads/model";
 
 type ThreadListObserver = ObservedResultListener<readonly Thread[]>;
+const MAX_RETAINED_THREAD_CATALOG_CONTEXTS = 4;
 
 interface ThreadCatalogStore {
   contextKey(): string;
@@ -113,7 +114,20 @@ export function createThreadCatalog(options: ThreadCatalogOptions): ThreadCatalo
 
 function threadCatalogFactsForContext(factsByContext: Map<string, ThreadCatalogFacts>, contextKey: string): ThreadCatalogFacts {
   const existing = factsByContext.get(contextKey);
-  if (existing) return existing;
+  if (existing) {
+    factsByContext.delete(contextKey);
+    factsByContext.set(contextKey, existing);
+    return existing;
+  }
+  while (factsByContext.size >= MAX_RETAINED_THREAD_CATALOG_CONTEXTS) {
+    let leastRecentlyUsed: string | undefined;
+    for (const key of factsByContext.keys()) {
+      leastRecentlyUsed = key;
+      break;
+    }
+    if (leastRecentlyUsed === undefined) break;
+    factsByContext.delete(leastRecentlyUsed);
+  }
   const facts = {
     active: pendingThreadListFacts(),
     archived: pendingThreadListFacts(),

tests/app-server/query-cache.test.ts

@@ -17,6 +17,12 @@ import {
 import type { SharedServerMetadata } from "../../src/domain/server/metadata";
 
 describe("AppServerQueryCache", () => {
+  it("allows inactive query contexts to be garbage-collected", () => {
+    const cache = new AppServerQueryCache();
+
+    expect(cache.client.getDefaultOptions().queries?.gcTime).toBe(300_000);
+  });
+
   it("preserves successful metadata resource values when probes fail", () => {
     const cache = new AppServerQueryCache();
     const context = cacheContext();

tests/features/threads/catalog/thread-catalog.test.ts

@@ -194,6 +194,22 @@ describe("ThreadCatalog", () => {
     expect(catalog.activeSnapshot()).toEqual([thread("started-a")]);
   });
 
+  it("evicts lifecycle facts for least-recently-used connection contexts", () => {
+    const context = { codexPath: "codex-a", vaultPath: "/vault" };
+    const { catalog } = catalogFixture({ context: () => context });
+    catalog.apply({ type: "thread-started", thread: thread("started-a") });
+
+    for (const suffix of ["b", "c", "d", "e"]) {
+      context.codexPath = `codex-${suffix}`;
+      catalog.activeSnapshot();
+    }
+
+    context.codexPath = "codex-a";
+    catalog.apply({ type: "active-list-snapshot-received", threads: [thread("server-a")] });
+
+    expect(catalog.activeSnapshot()).toEqual([thread("server-a")]);
+  });
+
   it("keeps rollback fork metadata until active snapshots catch up to the rollback version", () => {
     const { catalog } = catalogFixture();
     const forkBeforeRollback = thread("forked", false, { name: "Before", preview: "Before rollback", updatedAt: 20 });