1000 Group Document Metrics Date Format Fix Bfaa8533

# Group Document Metrics Date Format Fix

**Version:** 0.230.048  
**Fixed in:** 0.230.048

## Issue Description

Group document metrics in the Control Center were displaying "Last Day: 0" (count format) instead of "Last Day: 09/02/2025" (date format) like user document metrics. The user requested that group metrics follow the same format as user metrics showing actual dates instead of counts.

## Root Cause Analysis

The backend was providing two different data structures:
- **Users**: `last_day_upload` (singular) - a date string like "09/02/2025" 
- **Groups**: `last_day_uploads` (plural) - a count like `0` or `1`

The frontend group metrics function was using the count-based field instead of calculating and displaying the actual date of the last upload.

## Technical Solution

### Backend Changes (`route_backend_control_center.py`)

Added `last_day_upload` calculation logic to the `enhance_group_with_activity()` function:

1. **Query for Most Recent Upload**: Added database query to find the most recent document upload for each group
2. **Date Format Conversion**: Added logic to convert various date formats (ISO, date-only) to MM/DD/YYYY format
3. **Error Handling**: Added proper error handling for invalid dates with fallback to 'Never'
4. **Debug Logging**: Added comprehensive debug logging for troubleshooting

```python
# Calculate last_day_upload date string (matching user format)
last_upload_query = """
    SELECT TOP 1 c.upload_date, c.created_at, c.modified_at
    FROM c 
    WHERE c.group_id = @group_id 
    ORDER BY c.upload_date DESC, c.created_at DESC, c.modified_at DESC
"""
# ... date parsing and formatting logic
enhanced['activity']['document_metrics']['last_day_upload'] = last_day_upload
```

### Frontend Changes (`control-center.js`)

Updated `renderGroupDocumentMetrics()` function:

1. **Field Change**: Changed from `docMetrics.last_day_uploads` (count) to `docMetrics.last_day_upload` (date string)
2. **Display Logic**: Updated to show date strings like "09/02/2025" or "Never" instead of counts
3. **Validation Logic**: Updated empty state detection to check for 'Never' instead of count === 0

```javascript
const lastDayUpload = docMetrics.last_day_upload || 'Never';
// Display: <div><strong>Last Day:</strong> ${lastDayUpload}</div>
```

## Expected Display Format

Groups now display document metrics in the same format as users:

```
Last Day: 09/02/2025
Total Docs: 1
AI Search: 400 KB  
Storage: 815.6 KB
(Enhanced)
```

## Testing

Created comprehensive functional test (`test_group_document_metrics_display.py`) that validates:

- ✅ Backend provides `last_day_upload` field for groups
- ✅ Frontend JavaScript uses correct field name
- ✅ HTML template calls updated function  
- ✅ API endpoint structure supports new field

## Files Modified

1. **Backend**: `application/single_app/route_backend_control_center.py` - Added date calculation logic
2. **Frontend JS**: `application/single_app/static/js/control-center.js` - Updated display function
3. **Config**: `application/single_app/config.py` - Version increment to 0.230.048
4. **Test**: `functional_tests/test_group_document_metrics_display.py` - Validation test

## Validation Results

All functional tests pass ✅:
- Backend Group Metrics Logic: PASSED
- Control Center JavaScript Structure: PASSED  
- Control Center HTML Structure: PASSED
- Group Document Metrics API Structure: PASSED

The fix ensures group document metrics now display in the exact same format as user document metrics, showing actual dates instead of counts for the "Last Day" field.