diff --git a/src/application/dto/bucket.ts b/src/application/dto/bucket.ts
deleted file mode 100644
index e6f2736..0000000
--- a/src/application/dto/bucket.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-/**
- * Input for creating a new bucket.
- */
-export interface CreateBucketInput {
-  /** Bucket name (must match S3 naming rules: 3-63 chars, lowercase, no underscore) */
-  name: string;
-}
-
-/**
- * Single bucket representation returned by bucket endpoints.
- */
-export interface BucketResponse {
-  /** Bucket UUID */
-  id: string;
-  /** Bucket name */
-  name: string;
-  /** ISO-8601 timestamp of when the bucket was created */
-  createdAt: string;
-  /** Number of non-deleted objects in the bucket */
-  objectCount?: number;
-}
-
-/**
- * Response payload for the list-buckets endpoint.
- */
-export interface BucketListResponse {
-  /** Array of buckets */
-  buckets: BucketResponse[];
-}
-
-/**
- * Response payload for bucket creation.
- */
-export interface CreateBucketResponse {
-  /** Bucket UUID */
-  id: string;
-  /** Bucket name */
-  name: string;
-}
-
-/**
- * Response payload for bucket deletion.
- */
-export interface DeleteBucketResponse {
-  /** Whether the deletion succeeded */
-  success: boolean;
-}
diff --git a/src/application/dto/file.ts b/src/application/dto/file.ts
deleted file mode 100644
index 7bb9d2a..0000000
--- a/src/application/dto/file.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-/**
- * Public file information response returned by the file-info endpoint.
- * Mirrors the JSON shape of GET /file/:publicId/info.
- */
-export interface FileInfoResponse {
-  /** Public, shareable identifier (nanoid) */
-  public_id: string;
-  /** Stored file name */
-  file_name: string;
-  /** MIME type of the stored file */
-  mime_type: string;
-  /** File size in bytes */
-  size_bytes: number;
-  /** High-level file category (e.g. "document", "photo") */
-  file_type: string;
-  /** ISO-8601 timestamp of when the file record was created */
-  created_at: string;
-}
-
-/**
- * Summary-level file metadata used internally for constructing
- * upload responses and object listing entries.
- */
-export interface FileMetadata {
-  /** Public, shareable identifier (nanoid) */
-  publicId: string;
-  /** Telegram file identifier used to retrieve the file from Telegram CDN */
-  telegramFileId: string;
-  /** Telegram unique file identifier (persists across re‑uploads) */
-  telegramFileUniqueId: string;
-  /** Chat ID where the file or archive was stored */
-  storageChatId: number;
-  /** Message ID of the stored file or archive */
-  storageMessageId: number;
-  /** Stored file name */
-  fileName: string;
-  /** MIME type of the stored file */
-  mimeType: string;
-  /** File size in bytes */
-  sizeBytes: number;
-  /** High-level file category */
-  fileType: string;
-  /** Telegram user ID of the uploader; 0 when unknown or system */
-  uploaderId: number;
-  /** Timestamp of file record creation */
-  createdAt: Date | string | number;
-}
-
-/**
- * Upload response shape returned to API callers.
- * Mirrors the JSON output of the /api/upload endpoint.
- */
-export interface UploadResponse {
-  /** Public, shareable identifier */
-  public_id: string;
-  /** Stored file name */
-  file_name: string;
-  /** MIME type */
-  mime_type: string;
-  /** File size in bytes */
-  size_bytes: number;
-  /** High-level file category */
-  file_type: string;
-  /** ISO-8601 creation timestamp */
-  created_at: string;
-  /** Public download URL */
-  download_url: string;
-}
diff --git a/src/application/dto/s3.ts b/src/application/dto/s3.ts
deleted file mode 100644
index 61d72a7..0000000
--- a/src/application/dto/s3.ts
+++ /dev/null
@@ -1,87 +0,0 @@
-/**
- * A single S3 object as it appears in listing results.
- */
-export interface S3ObjectResponse {
-  /** The object key (full path within the bucket) */
-  key: string;
-  /** Stored file name (basename of the key) */
-  fileName: string;
-  /** MIME type of the stored object */
-  mimeType: string;
-  /** Object size in bytes */
-  sizeBytes: number;
-  /** High-level file category */
-  fileType: string;
-  /** SHA-256 hex digest of the object content */
-  etag: string | null;
-  /** ISO-8601 timestamp of last modification */
-  lastModified: string;
-  /** Public download URL */
-  downloadUrl: string;
-}
-
-/**
- * Response payload for S3 ListObjectsV1 / ListObjectsV2.
- */
-export interface S3ListObjectsResponse {
-  /** Array of object summaries */
-  objects: S3ObjectResponse[];
-  /** Common prefixes when a delimiter was used (e.g. "folder/" entries) */
-  prefixes: string[];
-  /** Whether more results are available */
-  isTruncated: boolean;
-  /** Token to pass as continuation-token to retrieve the next page */
-  nextContinuationToken: string | null;
-}
-
-/**
- * Input for the copy-object operation (Web API v1).
- */
-export interface S3CopyObjectInput {
-  /** Source object key within the same or source bucket */
-  sourceKey: string;
-  /** Destination bucket name; defaults to the source bucket when omitted */
-  destBucket?: string;
-  /** Destination object key */
-  destKey: string;
-}
-
-/**
- * Response payload for the copy-object operation.
- */
-export interface S3CopyObjectResponse {
-  /** Source object key that was copied */
-  sourceKey: string;
-  /** Destination object key */
-  destKey: string;
-  /** Destination bucket name */
-  destBucket: string;
-}
-
-/**
- * Summary of a multipart upload in listing results.
- */
-export interface S3MultipartUploadResponse {
-  /** The object key being uploaded */
-  key: string;
-  /** Upload identifier (nanoid) */
-  uploadId: string;
-  /** ISO-8601 timestamp when the upload was initiated */
-  initiatedAt: Date;
-  /** Identifier string of the upload initiator */
-  initiatedBy: string;
-}
-
-/**
- * Summary of a single part within a multipart upload.
- */
-export interface S3MultipartPartResponse {
-  /** 1-indexed part number */
-  partNumber: number;
-  /** ETag of the part content */
-  etag: string;
-  /** Part size in bytes */
-  sizeBytes: number;
-  /** ISO-8601 timestamp when the part was stored */
-  createdAt: Date;
-}