Fix v1.1.0: Analytics, Sessions, and Error Handling Improvements

DEBUG.md

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+# Debugging the Spelling Practice App
+
+This document provides guidance on debugging and testing the app's data handling functionality.
+
+## Testing Tools
+
+### 1. API Test Page
+
+A user-friendly interface for testing the API endpoints:
+
+- **URL**: http://localhost:3000/api-test.html
+- **Features**:
+  - Test the `/getResults` endpoint to retrieve session data
+  - Create and save new test sessions with customizable parameters
+  - View session details for specific users
+
+### 2. Test Script
+
+A Node.js script to verify the saveResults endpoint functionality:
+
+```bash
+node test-save-results.js
+```
+
+This script:
+1. Verifies the server is running
+2. Creates a test session for "testuser"
+3. Validates the session was saved correctly
+4. Shows summary information about the saved session
+
+## Common Issues
+
+### File Access Issues
+
+If you're experiencing issues with data storage or retrieval:
+
+1. **Check file permissions**:
+   - Make sure the `data` directory is writable by the Node.js process
+   - In Docker environments, ensure volume mounts are set up correctly
+
+2. **Verify file formats**:
+   - The app expects JSON files in a specific format
+   - If manually editing files, validate the JSON structure before restarting
+
+3. **Inspect server logs**:
+   - The server outputs detailed logs with emoji indicators
+   - Look for error messages marked with ❌
+
+### Session Data Troubleshooting
+
+If sessions aren't appearing correctly:
+
+1. **Format compatibility**:
+   - The app supports multiple data formats for backward compatibility
+   - Session data may use either `timestamp` or `date` fields
+   - Word data may be in `answers` or `words` arrays
+
+2. **Data verification flow**:
+   - Save a session using the API test page
+   - Check the response from the `/saveResults` endpoint
+   - Verify data using the `/getResults` endpoint
+   - Confirm it appears in the UI
+
+## Server Recovery
+
+If the server stops working:
+
+1. **Restart the server**:
+   ```bash
+   node server.js
+   ```
+
+2. **Check for errors in the logs**
+
+3. **Data integrity check**:
+   - Inspect JSON files in the `data` directory for formatting issues
+   - Restore from backups or seed files if needed
+
+## Recent Fixes
+
+- Added backup data display when `results.json` can't be read
+- Improved error handling in saveResults endpoint
+- Created helper functions to handle different session data formats
+- Added SVG clipping paths to fix analytics graph display issues