update

backend/src/services/bookstack.service.ts

@@ -86,8 +86,15 @@ function buildHeaders(): Record<string, string> {
  * Fetches all BookStack books and returns a map of book_id → book_slug.
  * The /api/pages list endpoint does not reliably include book_slug, so we
  * look it up separately and use it when constructing page URLs.
+ * Cached for 5 minutes to avoid hammering the API on every dashboard load.
  */
+let bookSlugMapCache: { map: Map<number, string>; expiresAt: number } | null = null;
+const BOOK_SLUG_CACHE_TTL_MS = 5 * 60 * 1000; // 5 minutes
+
 async function getBookSlugMap(): Promise<Map<number, string>> {
+  if (bookSlugMapCache && Date.now() < bookSlugMapCache.expiresAt) {
+    return bookSlugMapCache.map;
+  }
   const { bookstack } = environment;
   try {
     const response = await httpClient.get(
@@ -95,9 +102,11 @@ async function getBookSlugMap(): Promise<Map<number, string>> {
       { params: { count: 500 }, headers: buildHeaders() },
     );
     const books: Array<{ id: number; slug: string }> = response.data?.data ?? [];
-    return new Map(books.map((b) => [b.id, b.slug]));
+    const map = new Map(books.map((b) => [b.id, b.slug]));
+    bookSlugMapCache = { map, expiresAt: Date.now() + BOOK_SLUG_CACHE_TTL_MS };
+    return map;
   } catch {
-    return new Map();
+    return bookSlugMapCache?.map ?? new Map();
   }
 }