refactor(backend): split log files into separate file

lib/recommendation.ts

@@ -15,7 +15,7 @@ type RecommendationResource = {
   year?: number;
 };
 
-const cache = createCache<RecommendationResource>();
+const cache = createCache<RecommendationResource>("recommendations");
 
 export async function createRecommendationResource(
   res: GenericResource,
@@ -88,7 +88,7 @@ export async function getSimilarMovies(id: string) {
 export async function getAllRecommendations(): Promise<
   RecommendationResource[]
 > {
-  const keys = cache.keys("recommendations:movie:*");
+  const keys = cache.keys();
   const res = await Promise.all(keys.map((k) => cache.get(k)));
   return res.map((r) => JSON.parse(r));
 }