diff --git a/src/lib/components/atoms/buttons/FileThumbnailButton.svelte b/src/lib/components/atoms/buttons/FileThumbnailButton.svelte
index c71ff6b..bb7761e 100644
--- a/src/lib/components/atoms/buttons/FileThumbnailButton.svelte
+++ b/src/lib/components/atoms/buttons/FileThumbnailButton.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import { browser } from "$app/environment";
-  import type { SummarizedFileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { requestFileThumbnailDownload } from "$lib/services/file";
 
   interface Props {
diff --git a/src/lib/components/molecules/Categories/Categories.svelte b/src/lib/components/molecules/Categories/Categories.svelte
index a4a123b..12398f6 100644
--- a/src/lib/components/molecules/Categories/Categories.svelte
+++ b/src/lib/components/molecules/Categories/Categories.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
   import type { Component } from "svelte";
   import type { SvelteHTMLElements } from "svelte/elements";
-  import type { SubCategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SubCategoryInfo } from "$lib/modules/filesystem";
   import { SortBy, sortEntries } from "$lib/utils";
   import Category from "./Category.svelte";
   import type { SelectedCategory } from "./service";
diff --git a/src/lib/components/molecules/Categories/Category.svelte b/src/lib/components/molecules/Categories/Category.svelte
index fdba570..1613da5 100644
--- a/src/lib/components/molecules/Categories/Category.svelte
+++ b/src/lib/components/molecules/Categories/Category.svelte
@@ -3,7 +3,7 @@
   import type { SvelteHTMLElements } from "svelte/elements";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { CategoryLabel } from "$lib/components/molecules";
-  import type { SubCategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SubCategoryInfo } from "$lib/modules/filesystem";
   import type { SelectedCategory } from "./service";
 
   interface Props {
diff --git a/src/lib/components/molecules/SubCategories.svelte b/src/lib/components/molecules/SubCategories.svelte
index a271309..6db38f1 100644
--- a/src/lib/components/molecules/SubCategories.svelte
+++ b/src/lib/components/molecules/SubCategories.svelte
@@ -2,7 +2,7 @@
   import type { Component } from "svelte";
   import type { ClassValue, SvelteHTMLElements } from "svelte/elements";
   import { Categories, IconEntryButton, type SelectedCategory } from "$lib/components/molecules";
-  import type { CategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { CategoryInfo } from "$lib/modules/filesystem";
 
   import IconAddCircle from "~icons/material-symbols/add-circle";
 
diff --git a/src/lib/components/organisms/Category/Category.svelte b/src/lib/components/organisms/Category/Category.svelte
index 4824f82..81471e6 100644
--- a/src/lib/components/organisms/Category/Category.svelte
+++ b/src/lib/components/organisms/Category/Category.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
   import { CheckBox, RowVirtualizer } from "$lib/components/atoms";
   import { SubCategories, type SelectedCategory } from "$lib/components/molecules";
-  import type { CategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { CategoryInfo } from "$lib/modules/filesystem";
   import { sortEntries } from "$lib/utils";
   import File from "./File.svelte";
   import type { SelectedFile } from "./service";
diff --git a/src/lib/components/organisms/Category/File.svelte b/src/lib/components/organisms/Category/File.svelte
index 88e821a..d4f5d4d 100644
--- a/src/lib/components/organisms/Category/File.svelte
+++ b/src/lib/components/organisms/Category/File.svelte
@@ -2,7 +2,7 @@
   import { browser } from "$app/environment";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { CategoryFileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { CategoryFileInfo } from "$lib/modules/filesystem";
   import { requestFileThumbnailDownload } from "$lib/services/file";
   import type { SelectedFile } from "./service";
 
diff --git a/src/lib/components/organisms/Gallery.svelte b/src/lib/components/organisms/Gallery.svelte
index fb96775..40d4baf 100644
--- a/src/lib/components/organisms/Gallery.svelte
+++ b/src/lib/components/organisms/Gallery.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import { FileThumbnailButton, RowVirtualizer } from "$lib/components/atoms";
-  import type { SummarizedFileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { formatDate, formatDateSortable, SortBy, sortEntries } from "$lib/utils";
 
   interface Props {
diff --git a/src/lib/modules/filesystem/category.ts b/src/lib/modules/filesystem/category.ts
new file mode 100644
index 0000000..491d43d
--- /dev/null
+++ b/src/lib/modules/filesystem/category.ts
@@ -0,0 +1,104 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { CategoryInfo } from "./types";
+
+const cache = new FilesystemCache<CategoryId, CategoryInfo, Partial<CategoryInfo>>();
+
+const fetchFromIndexedDB = async (id: CategoryId) => {
+  const [category, subCategories] = await Promise.all([
+    id !== "root" ? IndexedDB.getCategoryInfo(id) : undefined,
+    IndexedDB.getCategoryInfos(id),
+  ]);
+  const files = category
+    ? await Promise.all(
+        category.files.map(async (file) => {
+          const fileInfo = await IndexedDB.getFileInfo(file.id);
+          return fileInfo
+            ? {
+                id: file.id,
+                contentType: fileInfo.contentType,
+                name: fileInfo.name,
+                createdAt: fileInfo.createdAt,
+                lastModifiedAt: fileInfo.lastModifiedAt,
+                isRecursive: file.isRecursive,
+              }
+            : undefined;
+        }),
+      )
+    : undefined;
+
+  if (id === "root") {
+    return { id, subCategories };
+  } else if (category) {
+    return {
+      id,
+      name: category.name,
+      subCategories,
+      files: files!.filter((file) => !!file),
+      isFileRecursive: category.isFileRecursive,
+    };
+  }
+};
+
+const fetchFromServer = async (id: CategoryId, masterKey: CryptoKey) => {
+  try {
+    const {
+      metadata,
+      subCategories: subCategoriesRaw,
+      files: filesRaw,
+    } = await trpc().category.get.query({ id });
+    const [subCategories, files] = await Promise.all([
+      Promise.all(
+        subCategoriesRaw.map(async (category) => ({
+          id: category.id,
+          ...(await decryptCategoryMetadata(category, masterKey)),
+        })),
+      ),
+      filesRaw
+        ? Promise.all(
+            filesRaw.map(async (file) => ({
+              id: file.id,
+              contentType: file.contentType,
+              isRecursive: file.isRecursive,
+              ...(await decryptFileMetadata(file, masterKey)),
+            })),
+          )
+        : undefined,
+    ]);
+
+    if (id === "root") {
+      return { id, subCategories };
+    } else {
+      return {
+        id,
+        subCategories,
+        files,
+        ...(await decryptCategoryMetadata(metadata!, masterKey)),
+      };
+    }
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      cache.delete(id);
+      await IndexedDB.deleteCategoryInfo(id as number);
+      return;
+    }
+    throw e;
+  }
+};
+
+export const getCategoryInfo = async (id: CategoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, async (isInitial, resolve) => {
+    if (isInitial) {
+      const info = await fetchFromIndexedDB(id);
+      if (info) {
+        resolve(info);
+      }
+    }
+
+    const info = await fetchFromServer(id, masterKey);
+    if (info) {
+      resolve(info);
+    }
+  });
+};
diff --git a/src/lib/modules/filesystem/directory.ts b/src/lib/modules/filesystem/directory.ts
new file mode 100644
index 0000000..b4f9aac
--- /dev/null
+++ b/src/lib/modules/filesystem/directory.ts
@@ -0,0 +1,74 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { monotonicResolve } from "$lib/utils";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptDirectoryMetadata, decryptFileMetadata } from "./internal.svelte";
+import type { DirectoryInfo } from "./types";
+
+const cache = new FilesystemCache<DirectoryId, DirectoryInfo>();
+
+const fetchFromIndexedDB = async (id: DirectoryId) => {
+  const [directory, subDirectories, files] = await Promise.all([
+    id !== "root" ? IndexedDB.getDirectoryInfo(id) : undefined,
+    IndexedDB.getDirectoryInfos(id),
+    IndexedDB.getFileInfos(id),
+  ]);
+
+  if (id === "root") {
+    return { id, subDirectories, files };
+  } else if (directory) {
+    return { id, parentId: directory.parentId, name: directory.name, subDirectories, files };
+  }
+};
+
+const fetchFromServer = async (id: DirectoryId, masterKey: CryptoKey) => {
+  try {
+    const {
+      metadata,
+      subDirectories: subDirectoriesRaw,
+      files: filesRaw,
+    } = await trpc().directory.get.query({ id });
+    const [subDirectories, files] = await Promise.all([
+      Promise.all(
+        subDirectoriesRaw.map(async (directory) => ({
+          id: directory.id,
+          ...(await decryptDirectoryMetadata(directory, masterKey)),
+        })),
+      ),
+      Promise.all(
+        filesRaw.map(async (file) => ({
+          id: file.id,
+          contentType: file.contentType,
+          ...(await decryptFileMetadata(file, masterKey)),
+        })),
+      ),
+    ]);
+
+    if (id === "root") {
+      return { id, subDirectories, files };
+    } else {
+      return {
+        id,
+        parentId: metadata!.parent,
+        subDirectories,
+        files,
+        ...(await decryptDirectoryMetadata(metadata!, masterKey)),
+      };
+    }
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      cache.delete(id);
+      await IndexedDB.deleteDirectoryInfo(id as number);
+      return;
+    }
+    throw e;
+  }
+};
+
+export const getDirectoryInfo = async (id: DirectoryId, masterKey: CryptoKey) => {
+  return await cache.get(id, (isInitial, resolve) =>
+    monotonicResolve(
+      [isInitial && fetchFromIndexedDB(id), fetchFromServer(id, masterKey)],
+      resolve,
+    ),
+  );
+};
diff --git a/src/lib/modules/filesystem/file.ts b/src/lib/modules/filesystem/file.ts
new file mode 100644
index 0000000..450ef41
--- /dev/null
+++ b/src/lib/modules/filesystem/file.ts
@@ -0,0 +1,70 @@
+import * as IndexedDB from "$lib/indexedDB";
+import { monotonicResolve } from "$lib/utils";
+import { trpc, isTRPCClientError } from "$trpc/client";
+import { FilesystemCache, decryptFileMetadata, decryptCategoryMetadata } from "./internal.svelte";
+import type { FileInfo } from "./types";
+
+const cache = new FilesystemCache<number, FileInfo>();
+
+const fetchFromIndexedDB = async (id: number) => {
+  const file = await IndexedDB.getFileInfo(id);
+  const categories = file
+    ? await Promise.all(
+        file.categoryIds.map(async (categoryId) => {
+          const category = await IndexedDB.getCategoryInfo(categoryId);
+          return category ? { id: category.id, name: category.name } : undefined;
+        }),
+      )
+    : undefined;
+
+  if (file) {
+    return {
+      id,
+      parentId: file.parentId,
+      contentType: file.contentType,
+      name: file.name,
+      createdAt: file.createdAt,
+      lastModifiedAt: file.lastModifiedAt,
+      categories: categories!.filter((category) => !!category),
+    };
+  }
+};
+
+const fetchFromServer = async (id: number, masterKey: CryptoKey) => {
+  try {
+    const { categories: categoriesRaw, ...metadata } = await trpc().file.get.query({ id });
+    const [categories] = await Promise.all([
+      Promise.all(
+        categoriesRaw.map(async (category) => ({
+          id: category.id,
+          ...(await decryptCategoryMetadata(category, masterKey)),
+        })),
+      ),
+    ]);
+
+    return {
+      id,
+      parentId: metadata.parent,
+      contentType: metadata.contentType,
+      contentIv: metadata.contentIv,
+      categories,
+      ...(await decryptFileMetadata(metadata, masterKey)),
+    };
+  } catch (e) {
+    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
+      cache.delete(id);
+      await IndexedDB.deleteFileInfo(id);
+      return;
+    }
+    throw e;
+  }
+};
+
+export const getFileInfo = async (id: number, masterKey: CryptoKey) => {
+  return await cache.get(id, (isInitial, resolve) =>
+    monotonicResolve(
+      [isInitial && fetchFromIndexedDB(id), fetchFromServer(id, masterKey)],
+      resolve,
+    ),
+  );
+};
diff --git a/src/lib/modules/filesystem/index.ts b/src/lib/modules/filesystem/index.ts
new file mode 100644
index 0000000..cb9e0f4
--- /dev/null
+++ b/src/lib/modules/filesystem/index.ts
@@ -0,0 +1,4 @@
+export * from "./category";
+export * from "./directory";
+export * from "./file";
+export * from "./types";
diff --git a/src/lib/modules/filesystem/internal.svelte.ts b/src/lib/modules/filesystem/internal.svelte.ts
new file mode 100644
index 0000000..7bfe60d
--- /dev/null
+++ b/src/lib/modules/filesystem/internal.svelte.ts
@@ -0,0 +1,84 @@
+import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
+
+export class FilesystemCache<K, V extends RV, RV = V> {
+  private map = new Map<K, V | Promise<V>>();
+
+  get(key: K, loader: (isInitial: boolean, resolve: (value: RV) => void) => void) {
+    const info = this.map.get(key);
+    if (info instanceof Promise) {
+      return info;
+    }
+
+    const { promise, resolve } = Promise.withResolvers<V>();
+    if (!info) {
+      this.map.set(key, promise);
+    }
+
+    loader(!info, (loadedInfo) => {
+      let info = this.map.get(key)!;
+      if (info instanceof Promise) {
+        const state = $state(loadedInfo);
+        this.map.set(key, state as V);
+        resolve(state as V);
+      } else {
+        Object.assign(info, loadedInfo);
+        resolve(info);
+      }
+    });
+
+    return info ?? promise;
+  }
+
+  delete(key: K) {
+    this.map.delete(key);
+  }
+}
+
+export const decryptDirectoryMetadata = async (
+  metadata: { dek: string; dekVersion: Date; name: string; nameIv: string },
+  masterKey: CryptoKey,
+) => {
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  const name = await decryptString(metadata.name, metadata.nameIv, dataKey);
+
+  return {
+    dataKey: { key: dataKey, version: metadata.dekVersion },
+    name,
+  };
+};
+
+const decryptDate = async (ciphertext: string, iv: string, dataKey: CryptoKey) => {
+  return new Date(parseInt(await decryptString(ciphertext, iv, dataKey), 10));
+};
+
+export const decryptFileMetadata = async (
+  metadata: {
+    dek: string;
+    dekVersion: Date;
+    name: string;
+    nameIv: string;
+    createdAt?: string;
+    createdAtIv?: string;
+    lastModifiedAt: string;
+    lastModifiedAtIv: string;
+  },
+  masterKey: CryptoKey,
+) => {
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  const [name, createdAt, lastModifiedAt] = await Promise.all([
+    decryptString(metadata.name, metadata.nameIv, dataKey),
+    metadata.createdAt
+      ? decryptDate(metadata.createdAt, metadata.createdAtIv!, dataKey)
+      : undefined,
+    decryptDate(metadata.lastModifiedAt, metadata.lastModifiedAtIv, dataKey),
+  ]);
+
+  return {
+    dataKey: { key: dataKey, version: metadata.dekVersion },
+    name,
+    createdAt,
+    lastModifiedAt,
+  };
+};
+
+export const decryptCategoryMetadata = decryptDirectoryMetadata;
diff --git a/src/lib/modules/filesystem/types.ts b/src/lib/modules/filesystem/types.ts
new file mode 100644
index 0000000..fe3254f
--- /dev/null
+++ b/src/lib/modules/filesystem/types.ts
@@ -0,0 +1,62 @@
+type DataKey = { key: CryptoKey; version: Date };
+
+interface LocalDirectoryInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  name: string;
+  subDirectories: SubDirectoryInfo[];
+  files: SummarizedFileInfo[];
+}
+
+interface RootDirectoryInfo {
+  id: "root";
+  parentId?: undefined;
+  dataKey?: undefined;
+  dataKeyVersion?: undefined;
+  name?: undefined;
+  subDirectories: SubDirectoryInfo[];
+  files: SummarizedFileInfo[];
+}
+
+export type DirectoryInfo = LocalDirectoryInfo | RootDirectoryInfo;
+export type SubDirectoryInfo = Omit<LocalDirectoryInfo, "parentId" | "subDirectories" | "files">;
+
+export interface FileInfo {
+  id: number;
+  parentId: DirectoryId;
+  dataKey?: DataKey;
+  contentType: string;
+  contentIv?: string;
+  name: string;
+  createdAt?: Date;
+  lastModifiedAt: Date;
+  categories: { id: number; name: string }[];
+}
+
+export type SummarizedFileInfo = Omit<FileInfo, "parentId" | "contentIv" | "categories">;
+export type CategoryFileInfo = SummarizedFileInfo & { isRecursive: boolean };
+
+interface LocalCategoryInfo {
+  id: number;
+  dataKey?: DataKey | undefined;
+  name: string;
+  subCategories: SubCategoryInfo[];
+  files: CategoryFileInfo[];
+  isFileRecursive: boolean;
+}
+
+interface RootCategoryInfo {
+  id: "root";
+  dataKey?: undefined;
+  name?: undefined;
+  subCategories: SubCategoryInfo[];
+  files?: undefined;
+  isFileRecursive?: undefined;
+}
+
+export type CategoryInfo = LocalCategoryInfo | RootCategoryInfo;
+export type SubCategoryInfo = Omit<
+  LocalCategoryInfo,
+  "subCategories" | "files" | "isFileRecursive"
+>;
diff --git a/src/lib/modules/filesystem2.svelte.ts b/src/lib/modules/filesystem2.svelte.ts
deleted file mode 100644
index eeb3766..0000000
--- a/src/lib/modules/filesystem2.svelte.ts
+++ /dev/null
@@ -1,436 +0,0 @@
-import {
-  getDirectoryInfos as getDirectoryInfosFromIndexedDB,
-  getDirectoryInfo as getDirectoryInfoFromIndexedDB,
-  storeDirectoryInfo,
-  deleteDirectoryInfo,
-  getFileInfos as getFileInfosFromIndexedDB,
-  getFileInfo as getFileInfoFromIndexedDB,
-  storeFileInfo,
-  deleteFileInfo,
-  getCategoryInfos as getCategoryInfosFromIndexedDB,
-  getCategoryInfo as getCategoryInfoFromIndexedDB,
-  storeCategoryInfo,
-  updateCategoryInfo as updateCategoryInfoInIndexedDB,
-  deleteCategoryInfo,
-} from "$lib/indexedDB";
-import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
-import { monotonicResolve } from "$lib/utils";
-import { trpc, isTRPCClientError } from "$trpc/client";
-
-type DataKey = { key: CryptoKey; version: Date };
-
-interface LocalDirectoryInfo {
-  id: number;
-  parentId: DirectoryId;
-  dataKey?: DataKey;
-  name: string;
-  subDirectories: SubDirectoryInfo[];
-  files: SummarizedFileInfo[];
-}
-
-interface RootDirectoryInfo {
-  id: "root";
-  parentId?: undefined;
-  dataKey?: undefined;
-  dataKeyVersion?: undefined;
-  name?: undefined;
-  subDirectories: SubDirectoryInfo[];
-  files: SummarizedFileInfo[];
-}
-
-export type DirectoryInfo = LocalDirectoryInfo | RootDirectoryInfo;
-export type SubDirectoryInfo = Omit<LocalDirectoryInfo, "parentId" | "subDirectories" | "files">;
-
-export interface FileInfo {
-  id: number;
-  parentId: DirectoryId;
-  dataKey?: DataKey;
-  contentType: string;
-  contentIv?: string;
-  name: string;
-  createdAt?: Date;
-  lastModifiedAt: Date;
-  categories: { id: number; name: string }[];
-}
-
-export type SummarizedFileInfo = Omit<FileInfo, "parentId" | "contentIv" | "categories">;
-export type CategoryFileInfo = SummarizedFileInfo & { isRecursive: boolean };
-
-interface LocalCategoryInfo {
-  id: number;
-  dataKey?: DataKey | undefined;
-  name: string;
-  subCategories: SubCategoryInfo[];
-  files: CategoryFileInfo[];
-  isFileRecursive: boolean;
-}
-
-interface RootCategoryInfo {
-  id: "root";
-  dataKey?: undefined;
-  name?: undefined;
-  subCategories: SubCategoryInfo[];
-  files?: undefined;
-  isFileRecursive?: undefined;
-}
-
-export type CategoryInfo = LocalCategoryInfo | RootCategoryInfo;
-export type SubCategoryInfo = Omit<
-  LocalCategoryInfo,
-  "subCategories" | "files" | "isFileRecursive"
->;
-
-const directoryInfoCache = new Map<DirectoryId, DirectoryInfo | Promise<DirectoryInfo>>();
-const fileInfoCache = new Map<number, FileInfo | Promise<FileInfo>>();
-const categoryInfoCache = new Map<CategoryId, CategoryInfo | Promise<CategoryInfo>>();
-
-export const getDirectoryInfo = async (id: DirectoryId, masterKey: CryptoKey) => {
-  const info = directoryInfoCache.get(id);
-  if (info instanceof Promise) {
-    return info;
-  }
-
-  const { promise, resolve } = Promise.withResolvers<DirectoryInfo>();
-  if (!info) {
-    directoryInfoCache.set(id, promise);
-  }
-
-  monotonicResolve(
-    [!info && fetchDirectoryInfoFromIndexedDB(id), fetchDirectoryInfoFromServer(id, masterKey)],
-    (directoryInfo) => {
-      let info = directoryInfoCache.get(id);
-      if (info instanceof Promise) {
-        const state = $state(directoryInfo);
-        directoryInfoCache.set(id, state);
-        resolve(state);
-      } else {
-        Object.assign(info!, directoryInfo);
-        resolve(info!);
-      }
-    },
-  );
-  return info ?? promise;
-};
-
-const fetchDirectoryInfoFromIndexedDB = async (
-  id: DirectoryId,
-): Promise<DirectoryInfo | undefined> => {
-  const [directory, subDirectories, files] = await Promise.all([
-    id !== "root" ? getDirectoryInfoFromIndexedDB(id) : undefined,
-    getDirectoryInfosFromIndexedDB(id),
-    getFileInfosFromIndexedDB(id),
-  ]);
-
-  if (id === "root") {
-    return { id, subDirectories, files };
-  } else if (directory) {
-    return { id, parentId: directory.parentId, name: directory.name, subDirectories, files };
-  }
-};
-
-const fetchDirectoryInfoFromServer = async (
-  id: DirectoryId,
-  masterKey: CryptoKey,
-): Promise<DirectoryInfo | undefined> => {
-  try {
-    const {
-      metadata,
-      subDirectories: subDirectoriesRaw,
-      files: filesRaw,
-    } = await trpc().directory.get.query({ id });
-    const [subDirectories, files] = await Promise.all([
-      Promise.all(
-        subDirectoriesRaw.map(async (directory) => {
-          const { dataKey } = await unwrapDataKey(directory.dek, masterKey);
-          const name = await decryptString(directory.name, directory.nameIv, dataKey);
-          return {
-            id: directory.id,
-            dataKey: { key: dataKey, version: directory.dekVersion },
-            name,
-          };
-        }),
-      ),
-      Promise.all(
-        filesRaw.map(async (file) => {
-          const { dataKey } = await unwrapDataKey(file.dek, masterKey);
-          const [name, createdAt, lastModifiedAt] = await Promise.all([
-            decryptString(file.name, file.nameIv, dataKey),
-            file.createdAt ? decryptDate(file.createdAt, file.createdAtIv!, dataKey) : undefined,
-            decryptDate(file.lastModifiedAt, file.lastModifiedAtIv, dataKey),
-          ]);
-          return {
-            id: file.id,
-            dataKey: { key: dataKey, version: file.dekVersion },
-            contentType: file.contentType,
-            name,
-            createdAt,
-            lastModifiedAt,
-          };
-        }),
-      ),
-    ]);
-
-    if (id === "root") {
-      return { id, subDirectories, files };
-    } else {
-      const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
-      const name = await decryptString(metadata!.name, metadata!.nameIv, dataKey);
-      return {
-        id,
-        parentId: metadata!.parent,
-        dataKey: { key: dataKey, version: metadata!.dekVersion },
-        name,
-        subDirectories,
-        files,
-      };
-    }
-  } catch (e) {
-    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
-      directoryInfoCache.delete(id);
-      await deleteDirectoryInfo(id as number);
-      return;
-    }
-    throw new Error("Failed to fetch directory information");
-  }
-};
-
-const decryptDate = async (ciphertext: string, iv: string, dataKey: CryptoKey) => {
-  return new Date(parseInt(await decryptString(ciphertext, iv, dataKey), 10));
-};
-
-export const getFileInfo = async (id: number, masterKey: CryptoKey) => {
-  const info = fileInfoCache.get(id);
-  if (info instanceof Promise) {
-    return info;
-  }
-
-  const { promise, resolve } = Promise.withResolvers<FileInfo>();
-  if (!info) {
-    fileInfoCache.set(id, promise);
-  }
-
-  monotonicResolve(
-    [!info && fetchFileInfoFromIndexedDB(id), fetchFileInfoFromServer(id, masterKey)],
-    (fileInfo) => {
-      let info = fileInfoCache.get(id);
-      if (info instanceof Promise) {
-        const state = $state(fileInfo);
-        fileInfoCache.set(id, state);
-        resolve(state);
-      } else {
-        Object.assign(info!, fileInfo);
-        resolve(info!);
-      }
-    },
-  );
-  return info ?? promise;
-};
-
-const fetchFileInfoFromIndexedDB = async (id: number): Promise<FileInfo | undefined> => {
-  const file = await getFileInfoFromIndexedDB(id);
-  const categories = await Promise.all(
-    file?.categoryIds.map(async (categoryId) => {
-      const categoryInfo = await getCategoryInfoFromIndexedDB(categoryId);
-      return categoryInfo ? { id: categoryId, name: categoryInfo.name } : undefined;
-    }) ?? [],
-  );
-
-  if (file) {
-    return {
-      id,
-      parentId: file.parentId,
-      contentType: file.contentType,
-      name: file.name,
-      createdAt: file.createdAt,
-      lastModifiedAt: file.lastModifiedAt,
-      categories: categories.filter((category) => !!category),
-    };
-  }
-};
-
-const fetchFileInfoFromServer = async (
-  id: number,
-  masterKey: CryptoKey,
-): Promise<FileInfo | undefined> => {
-  try {
-    const { categories: categoriesRaw, ...metadata } = await trpc().file.get.query({ id });
-    const categories = await Promise.all(
-      categoriesRaw.map(async (category) => {
-        const { dataKey } = await unwrapDataKey(category.dek, masterKey);
-        const name = await decryptString(category.name, category.nameIv, dataKey);
-        return { id: category.id, name };
-      }),
-    );
-
-    const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
-    const [name, createdAt, lastModifiedAt] = await Promise.all([
-      decryptString(metadata.name, metadata.nameIv, dataKey),
-      metadata.createdAt
-        ? decryptDate(metadata.createdAt, metadata.createdAtIv!, dataKey)
-        : undefined,
-      decryptDate(metadata.lastModifiedAt, metadata.lastModifiedAtIv, dataKey),
-    ]);
-
-    return {
-      id,
-      parentId: metadata.parent,
-      dataKey: { key: dataKey, version: new Date(metadata.dekVersion) },
-      contentType: metadata.contentType,
-      contentIv: metadata.contentIv,
-      name,
-      createdAt,
-      lastModifiedAt,
-      categories,
-    };
-  } catch (e) {
-    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
-      fileInfoCache.delete(id);
-      await deleteFileInfo(id);
-      return;
-    }
-    throw new Error("Failed to fetch file information");
-  }
-};
-
-export const getCategoryInfo = async (id: CategoryId, masterKey: CryptoKey) => {
-  const info = categoryInfoCache.get(id);
-  if (info instanceof Promise) {
-    return info;
-  }
-
-  const { promise, resolve } = Promise.withResolvers<CategoryInfo>();
-  if (!info) {
-    categoryInfoCache.set(id, promise);
-    const categoryInfo = await fetchCategoryInfoFromIndexedDB(id);
-    if (categoryInfo) {
-      const state = $state(categoryInfo);
-      categoryInfoCache.set(id, state);
-      resolve(state);
-    }
-  }
-
-  fetchCategoryInfoFromServer(id, masterKey).then((categoryInfo) => {
-    if (!categoryInfo) return;
-
-    let info = categoryInfoCache.get(id);
-    if (info instanceof Promise) {
-      const state = $state(categoryInfo);
-      categoryInfoCache.set(id, state);
-      resolve(state);
-    } else {
-      Object.assign(info!, categoryInfo);
-      resolve(info!);
-    }
-  });
-
-  return info ?? promise;
-};
-
-const fetchCategoryInfoFromIndexedDB = async (
-  id: CategoryId,
-): Promise<CategoryInfo | undefined> => {
-  const [category, subCategories] = await Promise.all([
-    id !== "root" ? getCategoryInfoFromIndexedDB(id) : undefined,
-    getCategoryInfosFromIndexedDB(id),
-  ]);
-  const files = category
-    ? await Promise.all(
-        category.files.map(async (file) => {
-          const fileInfo = await getFileInfoFromIndexedDB(file.id);
-          return fileInfo
-            ? {
-                id: file.id,
-                contentType: fileInfo.contentType,
-                name: fileInfo.name,
-                createdAt: fileInfo.createdAt,
-                lastModifiedAt: fileInfo.lastModifiedAt,
-                isRecursive: file.isRecursive,
-              }
-            : undefined;
-        }),
-      )
-    : undefined;
-
-  if (id === "root") {
-    return { id, subCategories };
-  } else if (category) {
-    return {
-      id,
-      name: category.name,
-      subCategories,
-      files: files!.filter((file) => !!file),
-      isFileRecursive: category.isFileRecursive,
-    };
-  }
-};
-
-const fetchCategoryInfoFromServer = async (
-  id: CategoryId,
-  masterKey: CryptoKey,
-): Promise<CategoryInfo | undefined> => {
-  try {
-    const {
-      metadata,
-      subCategories: subCategoriesRaw,
-      files: filesRaw,
-    } = await trpc().category.get.query({ id, recurse: true });
-    const [subCategories, files] = await Promise.all([
-      Promise.all(
-        subCategoriesRaw.map(async (category) => {
-          const { dataKey } = await unwrapDataKey(category.dek, masterKey);
-          const name = await decryptString(category.name, category.nameIv, dataKey);
-          return {
-            id: category.id,
-            dataKey: { key: dataKey, version: category.dekVersion },
-            name,
-          };
-        }),
-      ),
-      id !== "root"
-        ? Promise.all(
-            filesRaw!.map(async (file) => {
-              const { dataKey } = await unwrapDataKey(file.dek, masterKey);
-              const [name, createdAt, lastModifiedAt] = await Promise.all([
-                decryptString(file.name, file.nameIv, dataKey),
-                file.createdAt
-                  ? decryptDate(file.createdAt, file.createdAtIv!, dataKey)
-                  : undefined,
-                decryptDate(file.lastModifiedAt, file.lastModifiedAtIv, dataKey),
-              ]);
-              return {
-                id: file.id,
-                dataKey: { key: dataKey, version: file.dekVersion },
-                contentType: file.contentType,
-                name,
-                createdAt,
-                lastModifiedAt,
-                isRecursive: file.isRecursive,
-              };
-            }),
-          )
-        : undefined,
-    ]);
-
-    if (id === "root") {
-      return { id, subCategories };
-    } else {
-      const { dataKey } = await unwrapDataKey(metadata!.dek, masterKey);
-      const name = await decryptString(metadata!.name, metadata!.nameIv, dataKey);
-      return {
-        id,
-        dataKey: { key: dataKey, version: metadata!.dekVersion },
-        name,
-        subCategories,
-        files: files!,
-        isFileRecursive: false,
-      };
-    }
-  } catch (e) {
-    if (isTRPCClientError(e) && e.data?.code === "NOT_FOUND") {
-      categoryInfoCache.delete(id);
-      await deleteCategoryInfo(id as number);
-      return;
-    }
-    throw new Error("Failed to fetch category information");
-  }
-};
diff --git a/src/routes/(fullscreen)/file/[id]/+page.svelte b/src/routes/(fullscreen)/file/[id]/+page.svelte
index d5ba57c..113ddbe 100644
--- a/src/routes/(fullscreen)/file/[id]/+page.svelte
+++ b/src/routes/(fullscreen)/file/[id]/+page.svelte
@@ -5,7 +5,7 @@
   import { page } from "$app/state";
   import { FullscreenDiv } from "$lib/components/atoms";
   import { Categories, IconEntryButton, TopBar } from "$lib/components/molecules";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
   import { captureVideoThumbnail } from "$lib/modules/thumbnail";
   import { getFileDownloadState } from "$lib/modules/file";
   import { masterKeyStore } from "$lib/stores";
diff --git a/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte b/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
index 91dc7e5..b39ef72 100644
--- a/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
+++ b/src/routes/(fullscreen)/file/[id]/AddToCategoryBottomSheet.svelte
@@ -2,7 +2,7 @@
   import { BottomDiv, BottomSheet, Button, FullscreenDiv } from "$lib/components/atoms";
   import { SubCategories } from "$lib/components/molecules";
   import { CategoryCreateModal } from "$lib/components/organisms";
-  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { requestCategoryCreation } from "./service";
 
diff --git a/src/routes/(fullscreen)/file/downloads/+page.svelte b/src/routes/(fullscreen)/file/downloads/+page.svelte
index f9bfa84..e5a972f 100644
--- a/src/routes/(fullscreen)/file/downloads/+page.svelte
+++ b/src/routes/(fullscreen)/file/downloads/+page.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
-  import { getFileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo } from "$lib/modules/filesystem";
   import { getDownloadingFiles, clearDownloadedFiles } from "$lib/modules/file";
   import { masterKeyStore } from "$lib/stores";
   import File from "./File.svelte";
diff --git a/src/routes/(fullscreen)/file/downloads/File.svelte b/src/routes/(fullscreen)/file/downloads/File.svelte
index 6a2a0ca..f5012bc 100644
--- a/src/routes/(fullscreen)/file/downloads/File.svelte
+++ b/src/routes/(fullscreen)/file/downloads/File.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import type { FileDownloadState } from "$lib/modules/file";
-  import type { FileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { FileInfo } from "$lib/modules/filesystem";
   import { formatNetworkSpeed } from "$lib/utils";
 
   import IconCloud from "~icons/material-symbols/cloud";
diff --git a/src/routes/(fullscreen)/gallery/+page.svelte b/src/routes/(fullscreen)/gallery/+page.svelte
index ab73c70..4408cc1 100644
--- a/src/routes/(fullscreen)/gallery/+page.svelte
+++ b/src/routes/(fullscreen)/gallery/+page.svelte
@@ -4,7 +4,7 @@
   import { FullscreenDiv } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
   import { Gallery } from "$lib/components/organisms";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
 
   let { data } = $props();
diff --git a/src/routes/(fullscreen)/settings/cache/+page.svelte b/src/routes/(fullscreen)/settings/cache/+page.svelte
index 271ae96..2812b93 100644
--- a/src/routes/(fullscreen)/settings/cache/+page.svelte
+++ b/src/routes/(fullscreen)/settings/cache/+page.svelte
@@ -4,7 +4,7 @@
   import { TopBar } from "$lib/components/molecules";
   import type { FileCacheIndex } from "$lib/indexedDB";
   import { getFileCacheIndex, deleteFileCache as doDeleteFileCache } from "$lib/modules/file";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { formatFileSize } from "$lib/utils";
   import File from "./File.svelte";
diff --git a/src/routes/(fullscreen)/settings/cache/File.svelte b/src/routes/(fullscreen)/settings/cache/File.svelte
index 21d286a..5ae7794 100644
--- a/src/routes/(fullscreen)/settings/cache/File.svelte
+++ b/src/routes/(fullscreen)/settings/cache/File.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import type { FileCacheIndex } from "$lib/indexedDB";
-  import type { SummarizedFileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { formatDate, formatFileSize } from "$lib/utils";
 
   import IconDraft from "~icons/material-symbols/draft";
diff --git a/src/routes/(fullscreen)/settings/thumbnail/+page.svelte b/src/routes/(fullscreen)/settings/thumbnail/+page.svelte
index 8830133..6cc0aa8 100644
--- a/src/routes/(fullscreen)/settings/thumbnail/+page.svelte
+++ b/src/routes/(fullscreen)/settings/thumbnail/+page.svelte
@@ -5,7 +5,7 @@
   import { BottomDiv, Button, FullscreenDiv } from "$lib/components/atoms";
   import { IconEntryButton, TopBar } from "$lib/components/molecules";
   import { deleteAllFileThumbnailCaches } from "$lib/modules/file";
-  import { getFileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import File from "./File.svelte";
   import {
diff --git a/src/routes/(fullscreen)/settings/thumbnail/File.svelte b/src/routes/(fullscreen)/settings/thumbnail/File.svelte
index e5699e2..6b3e0d9 100644
--- a/src/routes/(fullscreen)/settings/thumbnail/File.svelte
+++ b/src/routes/(fullscreen)/settings/thumbnail/File.svelte
@@ -13,7 +13,7 @@
   import type { Writable } from "svelte/store";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { FileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { FileInfo } from "$lib/modules/filesystem";
   import { formatDateTime } from "$lib/utils";
   import type { GenerationStatus } from "./service.svelte";
 
diff --git a/src/routes/(fullscreen)/settings/thumbnail/service.svelte.ts b/src/routes/(fullscreen)/settings/thumbnail/service.svelte.ts
index 6b0acb2..3a4ab80 100644
--- a/src/routes/(fullscreen)/settings/thumbnail/service.svelte.ts
+++ b/src/routes/(fullscreen)/settings/thumbnail/service.svelte.ts
@@ -2,7 +2,7 @@ import { limitFunction } from "p-limit";
 import { get, writable, type Writable } from "svelte/store";
 import { encryptData } from "$lib/modules/crypto";
 import { storeFileThumbnailCache } from "$lib/modules/file";
-import type { FileInfo } from "$lib/modules/filesystem2.svelte";
+import type { FileInfo } from "$lib/modules/filesystem";
 import { generateThumbnail as doGenerateThumbnail } from "$lib/modules/thumbnail";
 import { requestFileDownload, requestFileThumbnailUpload } from "$lib/services/file";
 
diff --git a/src/routes/(main)/category/[[id]]/+page.svelte b/src/routes/(main)/category/[[id]]/+page.svelte
index 4a038d9..293ff76 100644
--- a/src/routes/(main)/category/[[id]]/+page.svelte
+++ b/src/routes/(main)/category/[[id]]/+page.svelte
@@ -2,7 +2,7 @@
   import { goto } from "$app/navigation";
   import { TopBar } from "$lib/components/molecules";
   import { Category, CategoryCreateModal } from "$lib/components/organisms";
-  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem2.svelte";
+  import { getCategoryInfo, type CategoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import CategoryDeleteModal from "./CategoryDeleteModal.svelte";
   import CategoryMenuBottomSheet from "./CategoryMenuBottomSheet.svelte";
diff --git a/src/routes/(main)/directory/[[id]]/+page.svelte b/src/routes/(main)/directory/[[id]]/+page.svelte
index 1bd2c5c..35ed266 100644
--- a/src/routes/(main)/directory/[[id]]/+page.svelte
+++ b/src/routes/(main)/directory/[[id]]/+page.svelte
@@ -4,7 +4,7 @@
   import { page } from "$app/state";
   import { FloatingButton } from "$lib/components/atoms";
   import { TopBar } from "$lib/components/molecules";
-  import { getDirectoryInfo, type DirectoryInfo } from "$lib/modules/filesystem2.svelte";
+  import { getDirectoryInfo, type DirectoryInfo } from "$lib/modules/filesystem";
   import { masterKeyStore, hmacSecretStore } from "$lib/stores";
   import DirectoryCreateModal from "./DirectoryCreateModal.svelte";
   import DirectoryEntries from "./DirectoryEntries";
diff --git a/src/routes/(main)/directory/[[id]]/DirectoryEntries/DirectoryEntries.svelte b/src/routes/(main)/directory/[[id]]/DirectoryEntries/DirectoryEntries.svelte
index 5375574..2db5533 100644
--- a/src/routes/(main)/directory/[[id]]/DirectoryEntries/DirectoryEntries.svelte
+++ b/src/routes/(main)/directory/[[id]]/DirectoryEntries/DirectoryEntries.svelte
@@ -2,7 +2,7 @@
   import { ActionEntryButton, RowVirtualizer } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
   import { getUploadingFiles, type LiveFileUploadState } from "$lib/modules/file";
-  import type { DirectoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { DirectoryInfo } from "$lib/modules/filesystem";
   import { sortEntries } from "$lib/utils";
   import File from "./File.svelte";
   import SubDirectory from "./SubDirectory.svelte";
diff --git a/src/routes/(main)/directory/[[id]]/DirectoryEntries/File.svelte b/src/routes/(main)/directory/[[id]]/DirectoryEntries/File.svelte
index 9a972aa..41f1a84 100644
--- a/src/routes/(main)/directory/[[id]]/DirectoryEntries/File.svelte
+++ b/src/routes/(main)/directory/[[id]]/DirectoryEntries/File.svelte
@@ -2,7 +2,7 @@
   import { browser } from "$app/environment";
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { SummarizedFileInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SummarizedFileInfo } from "$lib/modules/filesystem";
   import { requestFileThumbnailDownload } from "$lib/services/file";
   import { formatDateTime } from "$lib/utils";
   import type { SelectedEntry } from "../service.svelte";
diff --git a/src/routes/(main)/directory/[[id]]/DirectoryEntries/SubDirectory.svelte b/src/routes/(main)/directory/[[id]]/DirectoryEntries/SubDirectory.svelte
index 0d65cc2..018a1e5 100644
--- a/src/routes/(main)/directory/[[id]]/DirectoryEntries/SubDirectory.svelte
+++ b/src/routes/(main)/directory/[[id]]/DirectoryEntries/SubDirectory.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
   import { ActionEntryButton } from "$lib/components/atoms";
   import { DirectoryEntryLabel } from "$lib/components/molecules";
-  import type { SubDirectoryInfo } from "$lib/modules/filesystem2.svelte";
+  import type { SubDirectoryInfo } from "$lib/modules/filesystem";
   import type { SelectedEntry } from "../service.svelte";
 
   import IconMoreVert from "~icons/material-symbols/more-vert";
diff --git a/src/routes/(main)/home/+page.svelte b/src/routes/(main)/home/+page.svelte
index 21c3695..3d595b8 100644
--- a/src/routes/(main)/home/+page.svelte
+++ b/src/routes/(main)/home/+page.svelte
@@ -2,7 +2,7 @@
   import { onMount } from "svelte";
   import { goto } from "$app/navigation";
   import { EntryButton, FileThumbnailButton } from "$lib/components/atoms";
-  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem2.svelte";
+  import { getFileInfo, type FileInfo } from "$lib/modules/filesystem";
   import { masterKeyStore } from "$lib/stores";
   import { requestFreshMediaFilesRetrieval } from "./service";