feat: enhance backup process with lease management and attachment deletion

- Implemented a backup runner lease mechanism to prevent concurrent backup executions.
- Added `deleteAllAttachmentsForCiphers` function to delete attachments for multiple ciphers efficiently.
- Introduced `bulkDeleteAttachmentsByIds` method in storage to handle batch deletion of attachments.
- Updated backup execution logic to utilize the new lease management and ensure timely updates during the backup process.
- Refactored cipher deletion to handle attachments more effectively.
- Improved website icon loading with a dedicated caching mechanism for better performance.
- Added new index on `ciphers` table for `folder_id` to optimize queries related to folder management.
- Enhanced response handling for CORS policy to allow credentials for specific origins.

src/services/storage.ts

@@ -51,6 +51,7 @@ import {
 } from './storage-cipher-repo';
 import {
   addAttachmentToCipher as attachStoredAttachmentToCipher,
+  bulkDeleteAttachmentsByIds as deleteStoredAttachmentsByIds,
   deleteAllAttachmentsByCipher as deleteStoredAttachmentsByCipher,
   deleteAttachment as deleteStoredAttachment,
   getAttachment as findStoredAttachment,
@@ -107,7 +108,7 @@ import {
 
 const TWO_FACTOR_REMEMBER_TTL_MS = 30 * 24 * 60 * 60 * 1000;
 const STORAGE_SCHEMA_VERSION_KEY = 'schema.version';
-const STORAGE_SCHEMA_VERSION = '2026-04-22';
+const STORAGE_SCHEMA_VERSION = '2026-04-28';
 
 // D1-backed storage.
 // Contract:
@@ -339,7 +340,6 @@ export class StorageService {
       userId,
       ids,
       this.sqlChunkSize.bind(this),
-      this.saveCipher.bind(this),
       this.updateRevisionDate.bind(this)
     );
   }
@@ -347,7 +347,7 @@ export class StorageService {
   // Clear folder references from all ciphers owned by the user.
   // Without this, deleting a folder leaves stale folderId values in cipher JSON.
   async clearFolderFromCiphers(userId: string, folderId: string): Promise<void> {
-    await clearStoredFolderFromCiphers(this.db, userId, folderId, this.saveCipher.bind(this));
+    await clearStoredFolderFromCiphers(this.db, userId, folderId);
   }
 
   async getAllFolders(userId: string): Promise<Folder[]> {
@@ -372,6 +372,10 @@ export class StorageService {
     await deleteStoredAttachment(this.db, id);
   }
 
+  async bulkDeleteAttachmentsByIds(ids: string[]): Promise<void> {
+    await deleteStoredAttachmentsByIds(this.db, this.sqlChunkSize.bind(this), ids);
+  }
+
   async getAttachmentsByCipher(cipherId: string): Promise<Attachment[]> {
     return listStoredAttachmentsByCipher(this.db, cipherId);
   }