Add Advanced Export System with Custom Formats

[llinsss]

Problem

Current export system only supports basic CSV/PDF. Need advanced export with custom formats, scheduled exports, and cloud storage integration.

Proposed Solution

Build comprehensive export system with multiple formats, templates, scheduling, and S3/cloud storage.

Technical Implementation

New Files:

• backend/services/AdvancedExportService.js - Advanced export service
• backend/services/export/ExcelGenerator.js - Excel export
• backend/services/export/JsonExporter.js - JSON export
• backend/services/export/XmlExporter.js - XML export
• backend/services/export/CloudStorageService.js - S3/cloud integration
• backend/services/export/ScheduledExportService.js - Scheduled exports
• backend/models/ExportTemplate.js - Custom template model
• backend/models/ScheduledExport.js - Scheduled export model
• backend/controllers/advancedExportController.js - Export endpoints
• backend/routes/advancedExports.js - Export routes
• backend/migrations/20260327000014_create_export_templates.js - Migration
• backend/migrations/20260327000015_create_scheduled_exports.js - Migration
• backend/workers/scheduledExport.js - Export worker
• backend/tests/advancedExport.test.js - Test suite

Modify:

• backend/services/ExportService.js - Integrate advanced features
• backend/services/CsvGenerator.js - Add custom templates
• backend/services/PdfGenerator.js - Add custom templates
• backend/controllers/exportController.js - Add format options
• backend/.env.example - Add S3/cloud credentials

Export Formats

const EXPORT_FORMATS = {
  CSV: 'csv',
  EXCEL: 'xlsx',
  PDF: 'pdf',
  JSON: 'json',
  XML: 'xml'
};

// Custom template example
{
  name: "Monthly Financial Report",
  format: "excel",
  columns: [
    "date",
    "transaction_id",
    "type",
    "amount",
    "currency",
    "status",
    "fee",
    "net_amount"
  ],
  filters: {
    dateRange: "last_month",
    status: "completed",
    minAmount: 100
  },
  groupBy: "date",
  aggregations: {
    totalAmount: "sum",
    averageAmount: "avg",
    transactionCount: "count"
  }
}

Acceptance Criteria

• Support CSV, Excel, PDF, JSON, XML formats
• Custom export templates
• Scheduled exports (daily, weekly, monthly)
• Cloud storage integration (S3, Google Cloud)
• Email delivery of exports
• Large dataset handling (streaming)
• Export history tracking
• Test coverage > 80%

Priority

Medium - Important for business reporting