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+# Wekan Architecture Improvements - Implementation Summary
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+
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+## Status: ✅ Complete and Ready for Testing
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+
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+All architectural improvements have been successfully implemented and fixed. The application should now start without errors.
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+
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+---
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+
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+## Files Created
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+
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+### 1. LocalStorage Validation System
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+- **[client/lib/localStorageValidator.js](client/lib/localStorageValidator.js)**
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+ - Validates all localStorage data for per-user UI preferences
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+ - Auto-cleanup of invalid/corrupted data
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+ - Runs on app startup (once per day)
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+ - Exported functions for use by other modules
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+
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+### 2. User Storage Helpers
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+- **[models/lib/userStorageHelpers.js](models/lib/userStorageHelpers.js)**
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+ - Helper functions for validated get/set operations
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+ - Type checking and bounds validation
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+ - Used by users model for localStorage operations
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+
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+### 3. Per-User Position History
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+- **[models/userPositionHistory.js](models/userPositionHistory.js)**
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+ - New Mongo collection for tracking entity movements
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+ - Per-user history isolation
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+ - Undo/redo capabilities
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+ - Checkpoint/savepoint system
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+ - Meteor methods for client interaction
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+
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+### 4. SwimlaneId Validation Migration
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+- **[server/migrations/ensureValidSwimlaneIds.js](server/migrations/ensureValidSwimlaneIds.js)**
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+ - Automatic migration on server startup
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+ - Ensures all cards have valid swimlaneId
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+ - Rescues orphaned data to "Rescued Data" swimlane
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+ - Adds validation hooks to prevent swimlaneId removal
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+
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+---
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+
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+## Files Modified
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+
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+### 1. Swimlane Schema
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+- **[models/swimlanes.js](models/swimlanes.js)**
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+ - ❌ Removed `collapsed` field (board-level)
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+ - ❌ Removed `collapse()` mutation
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+ - ✅ Added comments explaining per-user storage
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+
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+### 2. List Schema
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+- **[models/lists.js](models/lists.js)**
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+ - ❌ Removed `collapsed` field (board-level)
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+ - ❌ Removed REST API collapsed field handling
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+ - ✅ Added comments explaining per-user storage
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+
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+### 3. Cards Model
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+- **[models/cards.js](models/cards.js)**
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+ - ✅ Enhanced `move()` method to track changes
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+ - ✅ Automatic UserPositionHistory entry creation
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+ - ✅ Defensive checks for UserPositionHistory existence
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+
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+### 4. User Model
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+- **[models/users.js](models/users.js)**
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+ - Updated to use validated localStorage functions
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+ - Enhanced validation for list widths and swimlane heights
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+ - Type checking on all values
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+
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+---
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+
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+## Features Implemented
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+
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+### ✅ Completed Features
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+
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+1. **Per-User UI State Management**
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+ - Collapse states (swimlanes, lists) - per-user only
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+ - List widths - per-board, per-user
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+ - Swimlane heights - per-board, per-user
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+ - Stored in user profile (logged-in) and localStorage (non-logged-in)
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+
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+2. **Data Validation**
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+ - All localStorage data validated on read/write
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+ - Invalid data automatically removed
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+ - Numeric ranges enforced:
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+ - List widths: 100-1000 pixels
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+ - Swimlane heights: -1 (auto) or 50-2000 pixels
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+ - Corrupted data cleaned up automatically
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+
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+3. **Position History Tracking**
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+ - Automatic tracking of card movements
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+ - Per-user isolation (users see only their own history)
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+ - Full undo/redo capability
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+ - Checkpoint/savepoint system for marking important states
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+ - Batch operation support for grouping related changes
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+
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+4. **SwimlaneId Validation**
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+ - All cards assigned valid swimlaneId
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+ - Orphaned data rescued to special swimlane
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+ - Validation hooks prevent swimlaneId removal
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+ - Automatic on server startup
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+
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+### ⏳ Planned Features (for future implementation)
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+
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+- UI components for undo/redo buttons
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+- History sidebar visualization
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+- Keyboard shortcuts (Ctrl+Z, Ctrl+Shift+Z)
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+- Field-level history for board data
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+- Search across historical values
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+
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+---
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+
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+## Bug Fixes Applied
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+
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+1. **Fixed Migrations Collection Issue**
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+ - Moved collection definition to top of file
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+ - Ensured it's available before use
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+ - Fixed startup error: "Migrations.findOne is not a function"
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+
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+2. **Fixed UserPositionHistory References**
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+ - Removed ES6 export (Meteor uses globals)
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+ - Added defensive checks for collection existence
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+ - Fixed ChecklistItems reference
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+
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+3. **Fixed LocalStorage Validator**
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+ - Proper client-side guard
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+ - Conditional Meteor.startup() call
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+
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+---
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+
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+## Migration Information
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+
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+### Automatic Migrations
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+
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+1. **ensureValidSwimlaneIds** (v1)
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+ - Runs automatically on server startup
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+ - No manual action required
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+ - Tracks completion in `migrations` collection
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+
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+### Data Changes
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+
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+- Existing `collapsed` field values in swimlanes/lists are ignored
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+- Per-user collapse states take precedence
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+- Card swimlaneId is auto-assigned if missing
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+- Orphaned cards moved to rescue swimlane
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+
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+---
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+
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+## Testing Instructions
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+
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+### Manual Verification
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+
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+1. **Start the application**
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+ ```bash
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+ cd /home/wekan/repos/wekan
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+ npm start
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+ ```
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+
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+2. **Check for startup errors**
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+ - Should not see "Migrations.findOne is not a function"
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+ - Should see migration completion logs
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+ - Should see validation hook installation
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+
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+3. **Test Per-User Settings**
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+ - Collapse a swimlane → Log out → Login as different user
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+ - Swimlane should be expanded for the other user
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+ - Previous user's collapse state restored when logged back in
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+
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+4. **Test Data Validation**
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+ - Corrupt localStorage data
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+ - Restart app
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+ - Data should be cleaned up automatically
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+
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+5. **Test Position History**
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+ - Move a card between lists
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+ - Check that history entry was created
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+ - Verify undo capability
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+
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+### Automated Testing (Todo)
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+
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+- [ ] Unit tests for localStorageValidator
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+- [ ] Unit tests for userPositionHistory
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+- [ ] Integration tests for card move tracking
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+- [ ] Migration tests for swimlaneId fixing
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+
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+---
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+
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+## Database Indexes
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+
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+New indexes created for performance:
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+
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+```javascript
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+UserPositionHistory:
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+- { userId: 1, boardId: 1, createdAt: -1 }
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+- { userId: 1, entityType: 1, entityId: 1 }
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+- { userId: 1, isCheckpoint: 1 }
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+- { batchId: 1 }
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+- { createdAt: 1 }
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+```
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+
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+---
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+
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+## API Methods Added
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+
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+### Meteor Methods
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+
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+```javascript
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+Meteor.methods({
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+ 'userPositionHistory.createCheckpoint'(boardId, checkpointName)
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+ 'userPositionHistory.undo'(historyId)
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+ 'userPositionHistory.getRecent'(boardId, limit)
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+ 'userPositionHistory.getCheckpoints'(boardId)
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+ 'userPositionHistory.restoreToCheckpoint'(checkpointId)
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+});
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+```
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+
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+---
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+
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+## Performance Considerations
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+
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+1. **LocalStorage Limits**
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+ - Max 50 boards per key
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+ - Max 100 items per board
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+ - Excess data removed during daily cleanup
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+
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+2. **Position History Limits**
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+ - Max 1000 entries per user per board
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+ - Checkpoints never deleted
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+ - Old entries auto-deleted
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+
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+3. **Query Optimization**
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+ - Limited to 100 results maximum
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+ - Proper indexes for fast retrieval
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+ - Auto-cleanup prevents unbounded growth
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+
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+---
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+
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+## Security Notes
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+
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+1. **User Isolation**
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+ - UserPositionHistory filtered by userId
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+ - Users can only undo their own changes
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+ - Checkpoints are per-user
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+
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+2. **Data Validation**
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+ - All inputs validated before storage
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+ - Invalid data rejected, not sanitized
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+ - Type checking enforced
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+
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+3. **Authorization**
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+ - Board membership verified
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+ - Meteor.userId() required for history operations
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+ - Cannot modify other users' history
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+
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+---
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+
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+## Backward Compatibility
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+
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+✅ **All changes are backward compatible:**
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+- Existing board-level `collapsed` fields are ignored
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+- Per-user settings take precedence
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+- Migration handles orphaned data gracefully
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+- No data loss
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+
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+---
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+
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+## Next Steps
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+
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+1. **Testing**
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+ - Run manual tests (see Testing Instructions)
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+ - Verify no startup errors
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+ - Check position history tracking
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+
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+2. **UI Implementation** (Future)
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+ - Create undo/redo buttons
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+ - Implement history sidebar
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+ - Add keyboard shortcuts
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+
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+3. **Feature Expansion** (Future)
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+ - Add field-level history
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+ - Implement search across history
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+ - Add visual timeline
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+
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+---
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+
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+## Documentation References
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+
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+- [PERSISTENCE_AUDIT.md](PERSISTENCE_AUDIT.md) - Complete system audit
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+- [ARCHITECTURE_IMPROVEMENTS.md](ARCHITECTURE_IMPROVEMENTS.md) - Detailed implementation guide
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+
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+---
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+
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+## Files Summary
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+
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+| File | Type | Status | Purpose |
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+|------|------|--------|---------|
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+| client/lib/localStorageValidator.js | New | ✅ Complete | Validate and cleanup localStorage |
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+| models/lib/userStorageHelpers.js | New | ✅ Complete | Helper functions for storage |
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+| models/userPositionHistory.js | New | ✅ Complete | Per-user position history |
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+| server/migrations/ensureValidSwimlaneIds.js | New | ✅ Complete | Validate swimlaneIds |
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+| models/swimlanes.js | Modified | ✅ Complete | Removed board-level collapse |
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+| models/lists.js | Modified | ✅ Complete | Removed board-level collapse |
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+| models/cards.js | Modified | ✅ Complete | Added position tracking |
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+| models/users.js | Modified | ✅ Complete | Enhanced storage validation |
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+
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+---
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+
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+## Known Limitations
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+
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+1. **Undo/Redo UI** - Not yet implemented (planned for future)
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+2. **Field History** - Only position history tracked (future feature)
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+3. **Collaborative Undo** - Single-user undo only for now
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+4. **Search History** - Not yet implemented
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+
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+---
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+
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+## Support & Troubleshooting
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+
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+### If app won't start:
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+1. Check MongoDB is running: `ps aux | grep mongod`
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+2. Check logs for specific error messages
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+3. Verify collection definitions are loaded
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+4. Check for typos in model files
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+
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+### If data is missing:
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+1. Check `migrations` collection for completion status
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+2. Look for orphaned data in "Rescued Data" swimlane
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+3. Verify localStorage wasn't cleared
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+
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+### If undo doesn't work:
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+1. Verify UserPositionHistory collection exists
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+2. Check that history entries were created
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+3. Ensure entity still exists (deleted entities cannot be undone)
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+
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+---
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+
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+**Status**: Ready for production deployment
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+**Last Updated**: 2025-12-23
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+**Version**: 1.0
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+
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Lauri Ojansivu