# 🚀 Master Data Export - Quick Start Guide

## ✨ What's New?

**Export ALL master data** (3M+ records) smoothly with one click!

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## 📍 Where to Find It

**Admin Panel** → **Master Data** → Click **"Export All Data"** button (green, top-right)

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## 🎯 How It Works

1. **Click** "Export All Data" button
2. **Wait** for progress bar to complete (shows real-time progress)
3. **Download** starts automatically when done!

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## ⚡ Features

✅ **Fast**: Batch processing (50K records per batch)  
✅ **Smooth**: Real-time progress tracking  
✅ **Smart**: Memory efficient for large datasets  
✅ **Safe**: No server storage needed  
✅ **Complete**: Exports ALL fields including custom fields  

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## 📊 Export Time Estimates

| Records | Time | File Size |
|---------|------|-----------|
| 100K    | ~10 sec | ~15 MB |
| 1M      | ~1 min | ~150 MB |
| 3M      | ~3 min | ~450 MB |

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## 📥 CSV Format

```
ID, Mobile, Name, Email, Address, Custom Field 1, Custom Field 2, Custom Field 3, Status, Uploaded At
```

**File Name**: `master_data_2025-12-18_3000000_records.csv`

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## ⚠️ Important Notes

- ⏳ **Don't close the browser** during export
- 🖥️ **Desktop recommended** for large exports (3M+)
- 📶 **Stable internet** required
- 💾 **Check disk space** before exporting large datasets

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## 🐛 Troubleshooting

**Problem**: Export stuck at 0%  
**Solution**: Refresh page and try again

**Problem**: File not downloading  
**Solution**: Check browser download settings/permissions

**Problem**: Export fails midway  
**Solution**: Check internet connection, try again

**Problem**: Browser freezes  
**Solution**: Close other tabs, increase browser memory

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## 🎨 What You'll See

1. **Modal appears** with title "Exporting Master Data"
2. **Progress bar** shows percentage and batch info
3. **Status message** updates in real-time
4. **Success message** when complete
5. **File downloads** automatically
6. **Modal closes** after 2 seconds

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## 🔧 For Developers

**Backend Routes**:
- `GET /admin/master_data_count` - Get total count
- `GET /admin/master_data_export_batch?offset=0&limit=50000` - Get batch

**Frontend Functions**:
- `exportMasterData()` - Start export
- `startBatchExport()` - Process batches
- `generateCSV()` - Create file
- `resetExport()` - Cleanup

**Batch Size**: 50,000 records per batch (configurable)

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## 📱 Support

Need help? Check [EXPORT_FEATURE_DOCUMENTATION.md](EXPORT_FEATURE_DOCUMENTATION.md) for detailed information.

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**Happy Exporting! 🎉**
