파일 캐시 추가

src/lib/indexedDB/cacheIndex.ts

@@ -0,0 +1,24 @@
+import { Dexie, type EntityTable } from "dexie";
+
+export interface FileCacheIndex {
+  fileId: number;
+  cachedAt: Date;
+  lastRetrievedAt: Date;
+  size: number;
+}
+
+const cacheIndex = new Dexie("cacheIndex") as Dexie & {
+  fileCache: EntityTable<FileCacheIndex, "fileId">;
+};
+
+cacheIndex.version(1).stores({
+  fileCache: "fileId",
+});
+
+export const getFileCacheIndex = async () => {
+  return await cacheIndex.fileCache.toArray();
+};
+
+export const storeFileCacheIndex = async (fileCacheIndex: FileCacheIndex) => {
+  await cacheIndex.fileCache.put(fileCacheIndex);
+};