refactor(backend): split log files into separate file

lib/cache.ts

@@ -6,12 +6,18 @@ interface SetCacheOptions {
   expires?: number; // Override expiration for individual cache entries
 }
 
+export const caches = new Map<
+  string,
+  { info: () => { count: number; sizeInKB: number } }
+>();
+
 export function createCache<T>(
+  cacheName: string,
   createOpts: CreateCacheOptions = {},
 ) {
   const cache = new Map<string, { value: T; expiresAt?: number }>();
 
-  return {
+  const api = {
     get(key: string): T | undefined {
       const entry = cache.get(key);
       if (!entry) return undefined;
@@ -86,4 +92,9 @@ export function createCache<T>(
       return cache.size;
     },
   };
+
+  caches.set(cacheName, {
+    info: api.info.bind(api),
+  });
+  return api;
 }