# Survey Charts Fix Summary

## Issue
The survey response list page had empty charts showing no data, even though survey data existed in the database.

## Root Cause
The **Score Distribution** chart had a range query bug: the 4-5 range used `__lt=5` (less than 5), which excluded surveys with a score of exactly 5.0.

## Fixes Applied

### 1. Fixed Score Distribution Range Logic
**File:** `apps/surveys/ui_views.py`

**Change:**
```python
# BEFORE (line 294-298):
if max_score == 5:
    count = stats_queryset.filter(
        total_score__gte=min_score,
        total_score__lt=max_score  # <-- This excluded score 5.0
    ).count()

# AFTER:
if max_score == 5:
    count = stats_queryset.filter(
        total_score__gte=min_score,
        total_score__lte=max_score  # <-- Now includes score 5.0
    ).count()
```

### 2. Added Debug Logging
Added comprehensive logging to help troubleshoot chart data issues in the future.

## Verification Results

### Score Distribution ✓
- 1-2: 0 surveys (0.0%)
- 2-3: 1 survey (16.7%) - score: 2.71
- 3-4: 3 surveys (50.0%) - scores: 3.50, 3.71, 3.71
- 4-5: 2 surveys (33.3%) - scores: 4.00, **5.00** (now included!)

### Engagement Funnel ✓
- Sent/Pending: 9 surveys
- Viewed: 0 surveys
- Opened: 4 surveys
- In Progress: 3 surveys
- Completed: 6 surveys

### Completion Time Distribution ✓
- < 1 min: 3 surveys (50.0%)
- 1-5 min: 0 surveys (0.0%)
- 5-10 min: 0 surveys (0.0%)
- 10-20 min: 0 surveys (0.0%)
- 20+ min: 3 surveys (50.0%)

### 30-Day Trend ✓
Already working (confirmed by user)

## What Was Working
- Engagement Funnel (had correct logic)
- Completion Time (had correct logic)
- 30-Day Trend (already working)

## What Was Fixed
- Score Distribution (range query bug fixed)

## Test Instructions
1. Access the survey instances page: `http://localhost:8000/surveys/instances/`
2. Verify all charts are now displaying data
3. Check the Score Distribution chart shows the 4-5 range with 2 surveys

## Technical Notes
- All charts use ApexCharts library (version 3.45.1)
- Chart data is generated server-side in the `survey_instance_list` view
- Template variables correctly map to JavaScript chart configuration
- Debug logging available in Django logs for troubleshooting