Enhance DocumentSchema and MinioService to support document folder creation. Update document creation logic to include folder setup in Minio after document creation. Refactor createDocumentFolder method to initialize a default page in the document folder. This improves document management and organization within the Minio storage system.

src/Minio/minio.service.ts

@@ -81,9 +81,15 @@ export class MinioService {
   async deleteFile(id: string, category: string) {
     return await this.minioClient.removeObject(this.configService.get('BUCKET_NAME') ?? 'epess', `${category}/${id}`)
   }
-  // create a folder for a document pattern epess/documents/<id>/<page>
+  // create a folder for a document pattern epess/documents/<id>/<page> and add page 0 to default
   async createDocumentFolder(id: string) {
-    return await this.minioClient.putObject(this.configService.get('BUCKET_NAME') ?? 'epess', `documents/${id}`, '')
+    const emptyDelta = JSON.stringify(new Delta().insert('\n'))
+    const result = await this.minioClient.putObject(
+      this.configService.get('BUCKET_NAME') ?? 'epess',
+      `documents/${id}/0`,
+      emptyDelta,
+    )
+    return result
   }
 
   async upsertDocumentPage(id: string, page: number, delta: Delta) {