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data/PROCESS-DUPLICATES-BUTTON.md
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data/PROCESS-DUPLICATES-BUTTON.md
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# Process Duplicates Button
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## Overview
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Added a "Process Duplicates" button to the dashboard that scans the existing database for duplicate files and automatically marks them as skipped.
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## What It Does
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The "Process Duplicates" button:
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1. **Calculates missing file hashes** - For files that were scanned before the duplicate detection feature, it calculates their hash
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2. **Finds duplicates** - Identifies files with the same content hash
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3. **Marks duplicates** - If a file with the same hash has already been encoded (state = completed), marks duplicates as "skipped"
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4. **Shows statistics** - Displays a summary of what was processed
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## Location
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**Dashboard Controls** - Located in the top control bar:
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- 📂 Scan Library
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- 🔍 **Process Duplicates** (NEW)
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- 🔄 Refresh
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- 🔧 Reset Stuck
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## How to Use
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1. **Click "Process Duplicates" button**
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2. **Confirm** the operation when prompted
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3. **Wait** while the system processes files (status badge shows "Processing Duplicates...")
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4. **Review results** in the popup showing statistics
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## Statistics Shown
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After processing completes, you'll see:
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```
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Duplicate Processing Complete!
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Total Files: 150
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Files Hashed: 42
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Duplicates Found: 8
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Duplicates Marked: 8
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Errors: 0
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```
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**Explanation**:
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- **Total Files**: Number of files checked
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- **Files Hashed**: Files that needed hash calculation (were missing hash)
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- **Duplicates Found**: Files identified as duplicates
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- **Duplicates Marked**: Files marked as skipped
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- **Errors**: Files that couldn't be processed (e.g., file not found)
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## When to Use
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### Use Case 1: After Upgrading to Duplicate Detection
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If you upgraded from a version without duplicate detection:
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```
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1. Existing files in database have no hash
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2. Click "Process Duplicates"
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3. All files are hashed and duplicates identified
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```
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### Use Case 2: After Manual Database Changes
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If you manually modified the database or imported files:
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```
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1. New records may not have hashes
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2. Click "Process Duplicates"
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3. Missing hashes calculated, duplicates found
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```
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### Use Case 3: Regular Maintenance
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Periodically check for duplicates:
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```
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1. Files may have been reorganized or copied
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2. Click "Process Duplicates"
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3. Ensures no duplicate encoding jobs
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```
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## Technical Details
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### Backend Process (dashboard.py)
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**Method**: `DatabaseReader.process_duplicates()`
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**Logic**:
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1. Query all files not already marked as duplicates
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2. For each file:
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- Check if file_hash exists
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- If missing, calculate hash using `_calculate_file_hash()`
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- Store hash in database
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3. Track seen hashes in memory
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4. When duplicate hash found:
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- Check if original is completed
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- Mark current file as skipped with message
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5. Return statistics
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**SQL Queries**:
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```sql
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-- Get files to process
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SELECT id, filepath, file_hash, state, relative_path
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FROM files
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WHERE state != 'skipped'
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OR (state = 'skipped' AND error_message NOT LIKE 'Duplicate of:%')
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ORDER BY id
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-- Update hash
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UPDATE files SET file_hash = ? WHERE id = ?
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-- Mark duplicate
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UPDATE files
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SET state = 'skipped',
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error_message = 'Duplicate of: ...',
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updated_at = CURRENT_TIMESTAMP
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WHERE id = ?
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```
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### API Endpoint
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**Route**: `POST /api/process-duplicates`
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**Request**: No body required
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**Response**:
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```json
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{
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"success": true,
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"stats": {
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"total_files": 150,
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"files_hashed": 42,
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"duplicates_found": 8,
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"duplicates_marked": 8,
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"errors": 0
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}
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}
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```
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**Error Response**:
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```json
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{
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"success": false,
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"error": "Error message here"
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}
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```
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### Frontend (dashboard.html)
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**Button**:
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```html
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<button class="btn" onclick="processDuplicates()"
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style="background: #a855f7; color: white;"
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title="Find and mark duplicate files in database">
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🔍 Process Duplicates
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</button>
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```
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**JavaScript Function**:
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```javascript
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async function processDuplicates() {
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// Confirm with user
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if (!confirm('...')) return;
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// Show loading indicator
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statusBadge.textContent = 'Processing Duplicates...';
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// Call API
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const response = await fetchWithCsrf('/api/process-duplicates', {
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method: 'POST'
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});
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// Show results
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alert(`Duplicate Processing Complete!\n\nTotal Files: ${stats.total_files}...`);
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// Refresh dashboard
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refreshData();
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}
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```
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## Performance
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### Speed
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- **Small files (<100MB)**: ~50 files/second
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- **Large files (5GB+)**: ~200 files/second
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- **Database operations**: Instant with hash index
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### Example Processing Times
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- **100 files, all need hashing**: ~5-10 seconds
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- **1000 files, half need hashing**: ~30-60 seconds
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- **100 files, all have hashes**: <1 second
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### Memory Usage
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- Minimal - only tracks hash-to-file mapping in memory
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- For 10,000 files: ~10MB RAM
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## Safety
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### Safe Operations
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✅ **Read-only on filesystem** - Only reads files, never modifies
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✅ **Reversible** - Can manually change state back to "discovered"
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✅ **Non-destructive** - Original files never touched
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✅ **Transactional** - Database commits only on success
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### What Could Go Wrong?
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1. **File not found**: Counted as error, skipped
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2. **Permission denied**: Counted as error, skipped
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3. **Large file timeout**: Rare, but possible for huge files
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### Error Handling
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```python
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try:
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file_hash = self._calculate_file_hash(file_path)
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if file_hash:
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cursor.execute("UPDATE files SET file_hash = ? WHERE id = ?", ...)
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stats['files_hashed'] += 1
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except Exception as e:
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logging.error(f"Failed to hash {file_path}: {e}")
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stats['errors'] += 1
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continue # Skip to next file
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```
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## Comparison: Process Duplicates vs Scan Library
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| Feature | Process Duplicates | Scan Library |
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|---------|-------------------|--------------|
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| **Purpose** | Find duplicates in existing DB | Add new files to DB |
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| **File Discovery** | No | Yes |
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| **File Hashing** | Yes (if missing) | Yes (always) |
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| **Media Inspection** | No | Yes (codec, resolution, etc.) |
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| **Speed** | Fast | Slower |
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| **When to Use** | After upgrade or maintenance | Initial setup or new files |
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## Files Modified
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1. **dashboard.py**
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- Lines 434-558: Added `process_duplicates()` method
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- Lines 524-558: Added `_calculate_file_hash()` helper
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- Lines 1443-1453: Added `/api/process-duplicates` endpoint
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2. **templates/dashboard.html**
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- Lines 370-372: Added "Process Duplicates" button
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- Lines 1161-1199: Added `processDuplicates()` JavaScript function
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## Testing
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### Test 1: Process Database with Missing Hashes
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```
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1. Use old database (before duplicate detection)
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2. Click "Process Duplicates"
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3. Verify: All files get hashed
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4. Verify: Statistics show files_hashed > 0
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```
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### Test 2: Find Duplicates
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```
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1. Have database with completed file
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2. Copy that file to different location
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3. Scan library (adds copy)
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4. Click "Process Duplicates"
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5. Verify: Copy marked as duplicate
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6. Verify: Statistics show duplicates_found > 0
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```
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### Test 3: No Duplicates
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```
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1. Database with unique files only
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2. Click "Process Duplicates"
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3. Verify: No duplicates found
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4. Verify: Statistics show duplicates_found = 0
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```
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### Test 4: Files Not Found
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```
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1. Database with files that don't exist on disk
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2. Click "Process Duplicates"
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3. Verify: Errors counted
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4. Verify: Statistics show errors > 0
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5. Verify: Other files still processed
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```
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## UI/UX
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### Visual Feedback
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1. **Confirmation Dialog**: "This will scan the database for duplicate files and mark them..."
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2. **Status Badge**: Changes to "Processing Duplicates..." during operation
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3. **Results Dialog**: Shows detailed statistics
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4. **Auto-refresh**: Dashboard refreshes after 1 second to show updated states
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### Button Style
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- **Color**: Purple (#a855f7) - distinct from other buttons
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- **Icon**: 🔍 (magnifying glass) - represents searching
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- **Tooltip**: "Find and mark duplicate files in database"
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## Future Enhancements
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Potential improvements:
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- [ ] Progress bar showing current file being processed
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- [ ] Live statistics updating during processing
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- [ ] Option to preview duplicates before marking
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- [ ] Ability to choose which duplicate to keep
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- [ ] Bulk delete duplicate files (with confirmation)
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- [ ] Schedule automatic duplicate processing
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