diff --git a/labs/lab04/README.md b/labs/lab04/README.md
deleted file mode 100644
index e34e6ba0b..000000000
--- a/labs/lab04/README.md
+++ /dev/null
@@ -1,399 +0,0 @@
-# Lab 04: Database & Persistence
-
-Welcome to Lab 04! In this lab, you'll learn about database fundamentals and implement persistence solutions in both Go and Flutter applications.
-
-## 🎯 Lab Overview
-
-This lab introduces **Database & Persistence** concepts by implementing data storage solutions in both Go (backend) and Flutter (frontend).
-
-### 🔧 Database Approaches Covered
-
-This lab demonstrates **4 different approaches** to database interaction in Go, allowing you to compare and contrast different patterns:
-
-#### 1. **Manual SQL** (`user_repository.go`) 
-- **Approach**: Raw SQL queries with `database/sql` package
-- **Pros**: Maximum control, best performance, clear SQL queries
-- **Cons**: More boilerplate, manual row scanning, SQL injection risk
-- **Use Case**: When you need precise control over queries and performance
-
-#### 2. **Scany Mapping** (`post_repository.go`)
-- **Approach**: Raw SQL queries + automatic struct mapping 
-- **Library**: `github.com/georgysavva/scany/v2/sqlscan`
-- **Pros**: Eliminates manual scanning, type-safe, good performance
-- **Cons**: Still requires SQL knowledge, limited query building
-- **Use Case**: When you want SQL control but easier result mapping
-
-#### 3. **Squirrel Query Builder** (`search_service.go`)
-- **Approach**: Dynamic query building with fluent API
-- **Library**: `github.com/Masterminds/squirrel`
-- **Pros**: Type-safe query building, dynamic conditions, readable code
-- **Cons**: Learning curve, abstraction overhead
-- **Use Case**: When you need dynamic queries with many conditional filters
-
-#### 4. **GORM ORM** (`category_repository.go`)
-- **Approach**: Full Object-Relational Mapping
-- **Library**: `gorm.io/gorm`
-- **Pros**: Rapid development, automatic migrations, associations
-- **Cons**: Less control, potential N+1 queries, steeper learning curve
-- **Use Case**: When you want rapid development and don't mind abstraction
-
-### 🎯 What You'll Learn
-
-Compare these approaches by implementing similar functionality:
-- **Performance**: Benchmark different approaches
-- **Code Complexity**: See boilerplate vs. abstraction trade-offs
-- **Type Safety**: Experience compile-time vs. runtime error detection
-- **Maintainability**: Understand long-term code maintenance implications
-
-### 🏗️ Project Structure
-
-```
-lab04/
-├── backend/           # Go backend with database operations
-│   ├── models/        # User and Post data models
-│   ├── database/      # Database connection and migrations
-│   ├── repository/    # CRUD operations and data access
-│   ├── main.go        # Application entry point
-│   └── go.mod         # Go dependencies
-├── frontend/          # Flutter frontend with local storage
-│   ├── lib/
-│   │   ├── models/    # Dart data models
-│   │   ├── services/  # Storage services
-│   │   └── screens/   # UI screens
-│   ├── test/          # Unit tests
-│   └── pubspec.yaml   # Flutter dependencies
-└── README.md          # This file
-```
-
-## 🔧 Setup Instructions
-
-### Backend Setup (Go)
-
-1. Navigate to the backend directory:
-```bash
-cd labs/lab04/backend
-```
-
-2. Install dependencies:
-```bash
-go mod tidy
-```
-
-3. Run the application:
-```bash
-go run main.go
-```
-
-4. Run tests:
-```bash
-go test ./...
-```
-
-### Frontend Setup (Flutter)
-
-1. Navigate to the frontend directory:
-```bash
-cd labs/lab04/frontend
-```
-
-2. Install dependencies:
-```bash
-flutter pub get
-```
-
-3. Generate JSON serialization code:
-```bash
-flutter packages pub run build_runner build
-```
-
-4. Run the app:
-```bash
-flutter run
-```
-
-5. Run tests:
-```bash
-flutter test
-```
-
-## 📝 Tasks Overview
-
-### Go Backend Tasks - Multiple Database Approaches
-
-Lab 4 covers **multiple database approaches** with **3 NECESSARY tasks** for evaluation plus **additional OPTIONAL tasks** for deeper learning:
-
----
-
-#### ✅ **NECESSARY TASKS** (Required for Lab Completion)
-
-#### Task 1: Manual SQL Repository (`user_repository.go`) 🔴 **REQUIRED**
-**Approach:** Raw SQL with `database/sql` package ⚡
-
-- ✅ **Maximum Control**: Write your own SQL queries
-- ✅ **Best Performance**: No ORM overhead
-- ✅ **Manual Scanning**: Explicit row-to-struct mapping
-
-**TODO Items:**
-- `UserRepository.Create()` - Raw SQL INSERT with parameter binding
-- `UserRepository.GetByID()` - Manual SELECT with row.Scan()
-- `UserRepository.Update()` - Dynamic UPDATE with prepared statements
-- `User.ScanRow()` - Manual database row scanning
-
-#### Task 2: Database Infrastructure (`database/connection.go`, `database/migrations.go`) 🔴 **REQUIRED**
-**Approach:** Standard database setup with goose migrations 🏗️
-
-- ✅ **Connection Management**: Proper database connection pooling
-- ✅ **Migration System**: Goose-based schema management
-- ✅ **Production Ready**: Configurable and maintainable setup
-
-**TODO Items:**
-- `InitDB()` - Standard database/sql connection setup
-- `RunMigrations()` - Execute goose migrations programmatically
-- Connection pooling configuration and management
-- **Makefile Commands**: `make migrate-up`, `make migrate-down`, `make migrate-status`
-
-#### Task 3: Data Models (`models/user.go`, `models/post.go`) 🔴 **REQUIRED**  
-**Approach:** Go structs with manual validation and mapping 📦
-
-- ✅ **Struct Design**: Proper JSON tags and database mapping
-- ✅ **Validation**: Input validation for data integrity
-- ✅ **Manual Mapping**: Row scanning and data conversion
-
-**TODO Items:**
-- `User.Validate()` - Data validation logic
-- `CreateUserRequest.ToUser()` - Request to model conversion
-- `User.ScanRow()` - Database row to struct mapping
-- Similar patterns for Post model
-
----
-
-#### 🎯 **OPTIONAL TASKS** (For Advanced Learning)
-
-#### Task 4: Scany Mapping Repository (`post_repository.go`) 🟡 **OPTIONAL**
-**Approach:** Raw SQL + automatic struct mapping 🔄
-
-- ✅ **SQL Control**: Write SQL, skip manual scanning
-- ✅ **Type Safety**: Automatic struct mapping with validation
-- ✅ **Good Performance**: Minimal reflection overhead
-
-**TODO Items:**
-- `PostRepository.Create()` - Use `sqlscan.Get()` for RETURNING queries
-- `PostRepository.GetAll()` - Use `sqlscan.Select()` for slice mapping
-- `PostRepository.Search()` - Complex WHERE with automatic scanning
-
-#### Task 5: Squirrel Query Builder (`search_service.go`) 🟡 **OPTIONAL**
-**Approach:** Dynamic query building with fluent API 🏗️
-
-- ✅ **Dynamic Queries**: Build complex queries programmatically
-- ✅ **Type Safety**: Compile-time query validation
-- ✅ **Readable Code**: Fluent API instead of string concatenation
-
-**TODO Items:**
-- `SearchService.SearchPosts()` - Dynamic filters with Squirrel
-- `SearchService.GetPostStats()` - Complex JOINs and aggregation
-- `SearchService.BuildDynamicQuery()` - Modular query building
-
-#### Task 6: GORM ORM Repository (`category_repository.go`) 🟡 **OPTIONAL**
-**Approach:** Full Object-Relational Mapping 🚀
-
-- ✅ **Rapid Development**: High-level database operations
-- ✅ **Auto Relationships**: Preload associations automatically
-- ✅ **Model Hooks**: Lifecycle management with hooks
-
-**TODO Items:**
-- `CategoryRepository.Create()` - GORM Create with auto-timestamps
-- `CategoryRepository.GetCategoriesWithPosts()` - GORM Preload
-- `Category.BeforeCreate()` - GORM lifecycle hooks
-- `CategoryRepository.CreateWithTransaction()` - GORM transactions
-
----
-
-#### 📚 **Why Multiple Approaches?**
-
-| Approach | Performance | Development Speed | Learning Value | Production Use |
-|----------|-------------|-------------------|----------------|----------------|
-| **Manual SQL** ⚡ | ⭐⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ | High-performance apps |
-| **Scany Mapping** 🔄 | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | Balanced control+convenience |
-| **Squirrel Builder** 🏗️ | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | Dynamic query scenarios |
-| **GORM ORM** 🚀 | ⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | Rapid prototyping |
-
-**Focus on the 3 NECESSARY tasks first, then explore OPTIONAL ones based on interest!**
-
-### Flutter Frontend Tasks
-
-#### Task 4: SharedPreferences Service 🔴 **REQUIRED**
-**File:** `frontend/lib/services/preferences_service.dart`
-
-Implement simple key-value storage:
-
-- ✅ **Basic Operations**: String, int, bool, list storage
-- ✅ **Object Storage**: JSON serialization for complex objects
-- ✅ **Key Management**: Check existence, get all keys, clear data
-- ✅ **Type Safety**: Proper null handling and type conversion
-
-**TODO Items to Complete:**
-- `init()` - Initialize SharedPreferences instance
-- `setString()`, `getString()` - String value operations
-- `setInt()`, `getInt()` - Integer value operations
-- `setBool()`, `getBool()` - Boolean value operations
-- `setStringList()`, `getStringList()` - String list operations
-- `setObject()`, `getObject()` - JSON object operations
-- `remove()`, `clear()` - Data cleanup operations
-- `containsKey()`, `getAllKeys()` - Key management
-
-#### Task 5: SQLite Database Service 🔴 **REQUIRED**
-**File:** `frontend/lib/services/database_service.dart`
-
-Implement local SQLite database:
-
-- ✅ **Database Setup**: Initialize SQLite with proper schema
-- ✅ **User CRUD**: Complete user operations
-- ✅ **Search Functionality**: Query users by name/email
-- ✅ **Database Management**: Path management, cleanup, migrations
-
-**TODO Items to Complete:**
-- `database` getter - Return database instance or initialize
-- `_initDatabase()` - Initialize SQLite database
-- `_onCreate()` - Create database tables and schema
-- `createUser()` - Insert user into database
-- `getUser()` - Get user by ID
-- `getAllUsers()` - Get all users ordered by creation
-- `updateUser()` - Update user with dynamic fields
-- `deleteUser()` - Delete user from database
-- `getUserCount()` - Count total users
-- `searchUsers()` - Search users by name/email
-- `closeDatabase()`, `clearAllData()` - Database management
-- `getDatabasePath()` - Get database file path
-
-#### Task 6: Secure Storage Service 🔴 **REQUIRED**
-**File:** `frontend/lib/services/secure_storage_service.dart`
-
-Implement encrypted storage for sensitive data:
-
-- ✅ **Authentication**: Token and credential storage
-- ✅ **User Preferences**: Biometric and security settings
-- ✅ **Generic Storage**: Custom key-value secure storage
-- ✅ **Object Storage**: Encrypted JSON object storage
-- ✅ **Key Management**: List keys, check existence, export data
-
-**TODO Items to Complete:**
-- `saveAuthToken()`, `getAuthToken()` - Authentication token management
-- `deleteAuthToken()` - Remove authentication token
-- `saveUserCredentials()`, `getUserCredentials()` - Login credentials
-- `deleteUserCredentials()` - Remove stored credentials
-- `saveBiometricEnabled()`, `isBiometricEnabled()` - Biometric settings
-- `saveSecureData()`, `getSecureData()` - Generic secure storage
-- `deleteSecureData()` - Remove secure data by key
-- `saveObject()`, `getObject()` - Encrypted object storage
-- `containsKey()`, `getAllKeys()` - Key management
-- `clearAll()` - Remove all secure data
-- `exportData()` - Export all data (for backup)
-
-## 🧪 Testing
-
-### Go Tests
-
-```bash
-# Run all tests
-go test ./...
-
-# Run specific package tests
-go test ./models
-go test ./database
-go test ./repository
-
-# Run tests with verbose output
-go test -v ./...
-```
-
-### Flutter Tests
-
-```bash
-# Run all tests
-flutter test
-
-# Run specific test file
-flutter test test/preferences_service_test.dart
-flutter test test/database_service_test.dart
-flutter test test/secure_storage_service_test.dart
-
-# Run tests with coverage
-flutter test --coverage
-```
-
-## 💡 Implementation Tips
-
-### Go Backend
-
-1. **Database Connection**: Use connection pooling for production
-2. **SQL Injection**: Always use prepared statements
-3. **Error Handling**: Return appropriate error types
-4. **Validation**: Validate data before database operations
-5. **Transactions**: Use transactions for related operations
-
-### Flutter Frontend
-
-1. **Initialization**: Initialize services in main() before runApp()
-2. **Error Handling**: Handle storage exceptions gracefully
-3. **Type Safety**: Use proper null safety patterns
-4. **Performance**: Use batch operations for multiple inserts
-5. **Security**: Never store sensitive data in SharedPreferences
-
-## 🎨 Storage Patterns
-
-### When to Use Each Storage Type
-
-| Storage Type | Use Cases | Examples |
-|--------------|-----------|----------|
-| **SharedPreferences** | Simple settings, flags | Theme, language, user preferences |
-| **SQLite** | Structured data, relationships | Users, posts, complex queries |
-| **Secure Storage** | Sensitive information | Tokens, passwords, API keys |
-
-### Data Flow Patterns
-
-1. **Cache-First**: Check local storage before API calls
-2. **API-First**: Always fetch from server, cache locally
-3. **Offline-First**: Work offline by default, sync when online
-
-## 🔒 Security Considerations
-
-1. **Never store sensitive data in SharedPreferences**
-2. **Use Secure Storage for authentication tokens**
-3. **Validate all user input before storage**
-4. **Use proper encryption for sensitive local data**
-5. **Implement proper session management**
-
-## 🚀 Bonus Challenges
-
-1. **Advanced Queries**: Implement complex SQL queries with joins
-2. **Migration System**: Add database schema versioning
-3. **Sync Mechanism**: Implement offline-first with sync
-4. **Caching Strategy**: Add intelligent caching layer
-5. **Performance Monitoring**: Add query performance tracking
-
-## 📖 Resources
-
-- [Go database/sql Documentation](https://pkg.go.dev/database/sql)
-- [SQLite Documentation](https://www.sqlite.org/docs.html)
-- [Flutter SharedPreferences](https://pub.dev/packages/shared_preferences)
-- [Flutter sqflite](https://pub.dev/packages/sqflite)
-- [Flutter Secure Storage](https://pub.dev/packages/flutter_secure_storage)
-
-## 🎯 Success Criteria
-
-Your lab is complete when:
-- ✅ All Go tests pass (models, database, repository)
-- ✅ All Flutter tests pass (preferences, database, secure storage)
-- ✅ You can create, read, update, and delete data in both backends
-- ✅ You understand the trade-offs between different storage types
-- ✅ You can implement basic data synchronization patterns
-
-## 🆘 Getting Help
-
-If you're stuck:
-1. Check the TODO comments in the code for guidance
-2. Review the test files to understand expected behavior
-3. Consult the documentation links above
-4. Ask questions in the course discussion forum
-
-Good luck, and enjoy learning about database and persistence patterns! 🎉 
\ No newline at end of file
diff --git a/labs/lab04/backend/Makefile b/labs/lab04/backend/Makefile
deleted file mode 100644
index 0952d3593..000000000
--- a/labs/lab04/backend/Makefile
+++ /dev/null
@@ -1,131 +0,0 @@
-# Go database migration management with goose
-# Usage: make migrate-up, make migrate-down, make migrate-status, etc.
-
-# Database configuration
-DATABASE_URL ?= ./lab04.db
-MIGRATIONS_DIR = ./migrations
-
-# Default target
-.PHONY: help
-help:
-	@echo "Available commands:"
-	@echo "  make migrate-up       - Run all pending migrations"
-	@echo "  make migrate-down     - Rollback last migration"
-	@echo "  make migrate-status   - Show migration status"
-	@echo "  make migrate-reset    - Reset database (DROP ALL TABLES)"
-	@echo "  make migrate-create   - Create new migration (usage: make migrate-create NAME=add_new_table)"
-	@echo "  make install-goose    - Install goose migration tool"
-	@echo "  make clean-db         - Remove database file"
-	@echo "  make setup-db         - Clean and setup fresh database"
-
-# Install goose if not present
-.PHONY: install-goose
-install-goose:
-	@which goose > /dev/null || go install github.com/pressly/goose/v3/cmd/goose@latest
-	@echo "✅ Goose migration tool ready"
-
-# Run all pending migrations
-.PHONY: migrate-up
-migrate-up: install-goose
-	@echo "🚀 Running migrations..."
-	@goose -dir $(MIGRATIONS_DIR) sqlite3 $(DATABASE_URL) up
-	@echo "✅ Migrations completed"
-
-# Rollback last migration
-.PHONY: migrate-down
-migrate-down: install-goose
-	@echo "⏪ Rolling back last migration..."
-	@goose -dir $(MIGRATIONS_DIR) sqlite3 $(DATABASE_URL) down
-	@echo "✅ Rollback completed"
-
-# Show migration status
-.PHONY: migrate-status
-migrate-status: install-goose
-	@echo "📊 Migration status:"
-	@goose -dir $(MIGRATIONS_DIR) sqlite3 $(DATABASE_URL) status
-
-# Reset database (WARNING: removes all data)
-.PHONY: migrate-reset
-migrate-reset: install-goose
-	@echo "⚠️  WARNING: This will remove ALL data!"
-	@read -p "Are you sure? (y/N): " confirm && [ "$$confirm" = "y" ]
-	@goose -dir $(MIGRATIONS_DIR) sqlite3 $(DATABASE_URL) reset
-	@echo "🗑️  Database reset completed"
-
-# Create new migration
-.PHONY: migrate-create
-migrate-create: install-goose
-	@if [ -z "$(NAME)" ]; then \
-		echo "❌ Error: NAME is required. Usage: make migrate-create NAME=add_new_table"; \
-		exit 1; \
-	fi
-	@echo "📝 Creating migration: $(NAME)"
-	@goose -dir $(MIGRATIONS_DIR) create $(NAME) sql
-	@echo "✅ Migration created in $(MIGRATIONS_DIR)/"
-
-# Remove database file
-.PHONY: clean-db
-clean-db:
-	@echo "🗑️  Removing database file..."
-	@rm -f $(DATABASE_URL)
-	@echo "✅ Database file removed"
-
-# Setup fresh database
-.PHONY: setup-db
-setup-db: clean-db migrate-up
-	@echo "🎉 Fresh database setup completed!"
-
-# Run tests with fresh database
-.PHONY: test-with-fresh-db
-test-with-fresh-db: setup-db
-	@echo "🧪 Running tests with fresh database..."
-	@go test ./...
-
-# Show database schema (requires sqlite3 command)
-.PHONY: show-schema
-show-schema:
-	@echo "📋 Database schema:"
-	@sqlite3 $(DATABASE_URL) ".schema"
-
-# Show all tables
-.PHONY: show-tables
-show-tables:
-	@echo "📊 Database tables:"
-	@sqlite3 $(DATABASE_URL) ".tables"
-
-# Backup database
-.PHONY: backup-db
-backup-db:
-	@echo "💾 Creating database backup..."
-	@cp $(DATABASE_URL) "./lab04_backup_$(shell date +%Y%m%d_%H%M%S).db"
-	@echo "✅ Backup created"
-
-# Development helpers
-.PHONY: dev-setup
-dev-setup: install-goose setup-db
-	@echo "👨‍💻 Development environment setup completed!"
-	@echo "📚 Next steps:"
-	@echo "  - Run 'make test-with-fresh-db' to verify setup"
-	@echo "  - Use 'make migrate-create NAME=your_migration' to add migrations"
-	@echo "  - Use 'make migrate-status' to check migration state"
-
-# Run go mod tidy
-.PHONY: tidy
-tidy:
-	@echo "🧹 Running go mod tidy..."
-	@go mod tidy
-	@echo "✅ Dependencies updated"
-
-# Run all tests
-.PHONY: test
-test:
-	@echo "🧪 Running all tests..."
-	@go test ./... -v
-
-# Run tests with coverage
-.PHONY: test-coverage
-test-coverage:
-	@echo "📊 Running tests with coverage..."
-	@go test ./... -cover -coverprofile=coverage.out
-	@go tool cover -html=coverage.out -o coverage.html
-	@echo "✅ Coverage report generated: coverage.html" 
\ No newline at end of file
diff --git a/labs/lab04/backend/README.md b/labs/lab04/backend/README.md
deleted file mode 100644
index ced0500e2..000000000
--- a/labs/lab04/backend/README.md
+++ /dev/null
@@ -1,88 +0,0 @@
-# Lab 04 Backend - Database & Persistence
-
-Go backend demonstrating multiple database approaches and migration management.
-
-## 🛠️ Migration Commands
-
-### Quick Start
-```bash
-# Setup fresh database
-make setup-db
-
-# Install dependencies
-make tidy
-```
-
-### Migration Management
-```bash
-# Run all pending migrations
-make migrate-up
-
-# Rollback last migration  
-make migrate-down
-
-# Check migration status
-make migrate-status
-
-# Create new migration
-make migrate-create NAME=add_new_feature
-
-# Reset database (⚠️ removes all data)
-make migrate-reset
-```
-
-### Development Commands
-```bash
-# Show all available commands
-make help
-
-# Run tests
-make test
-
-# Run tests with coverage
-make test-coverage
-
-# Database inspection
-make show-schema    # Show full schema
-make show-tables    # List all tables
-
-# Database management
-make clean-db       # Remove database file
-make backup-db      # Create timestamped backup
-```
-
-## 📁 Migration Files
-
-Migrations are stored in `../migrations/` directory:
-- `20250708090008_create_users_table.sql`
-- `20250708090034_create_posts_table.sql` 
-- `20250708090055_create_categories_table.sql`
-
-## 🎯 Task Structure
-
-### ✅ NECESSARY Tasks (Required)
-1. **Data Models** (`models/user.go`, `models/post.go`)
-2. **Database Infrastructure** (`database/connection.go`, `database/migrations.go`)
-3. **Manual SQL Repository** (`repository/user_repository.go`)
-
-### 🟡 OPTIONAL Tasks (Advanced Learning)
-4. **Scany Mapping** (`repository/post_repository.go`)
-5. **Squirrel Builder** (`services/search_service.go`)
-6. **GORM ORM** (`repository/category_repository.go`)
-
-## 🗄️ Database Schema
-
-The migrations create these tables:
-- **users**: User accounts with soft delete support
-- **posts**: Blog posts with user relationships
-- **categories**: Category system for GORM examples
-- **post_categories**: Many-to-many junction table
-
-All tables include proper indexes for performance and foreign key constraints for data integrity.
-
-## 🚀 Next Steps
-
-1. Complete the 3 necessary tasks first
-2. Run tests: `make test-with-fresh-db`
-3. Explore optional approaches based on interest
-4. Study different database patterns and trade-offs 
\ No newline at end of file
diff --git a/labs/lab04/backend/database/connection.go b/labs/lab04/backend/database/connection.go
deleted file mode 100644
index 49db9deeb..000000000
--- a/labs/lab04/backend/database/connection.go
+++ /dev/null
@@ -1,58 +0,0 @@
-package database
-
-import (
-	"database/sql"
-	"fmt"
-	"time"
-
-	_ "github.com/mattn/go-sqlite3"
-)
-
-// Config holds database configuration
-type Config struct {
-	DatabasePath    string
-	MaxOpenConns    int
-	MaxIdleConns    int
-	ConnMaxLifetime time.Duration
-	ConnMaxIdleTime time.Duration
-}
-
-// DefaultConfig returns a default database configuration
-func DefaultConfig() *Config {
-	return &Config{
-		DatabasePath:    "./lab04.db",
-		MaxOpenConns:    25,
-		MaxIdleConns:    5,
-		ConnMaxLifetime: 5 * time.Minute,
-		ConnMaxIdleTime: 2 * time.Minute,
-	}
-}
-
-// TODO: Implement InitDB function
-func InitDB() (*sql.DB, error) {
-	// TODO: Initialize database connection with SQLite
-	// - Open database connection using sqlite3 driver
-	// - Apply connection pool configuration from DefaultConfig()
-	// - Test connection with Ping()
-	// - Return the database connection or error
-	return nil, fmt.Errorf("TODO: implement InitDB function")
-}
-
-// TODO: Implement InitDBWithConfig function
-func InitDBWithConfig(config *Config) (*sql.DB, error) {
-	// TODO: Initialize database connection with custom configuration
-	// - Open database connection using the provided config
-	// - Apply all connection pool settings
-	// - Test connection with Ping()
-	// - Return the database connection or error
-	return nil, fmt.Errorf("TODO: implement InitDBWithConfig function")
-}
-
-// TODO: Implement CloseDB function
-func CloseDB(db *sql.DB) error {
-	// TODO: Properly close database connection
-	// - Check if db is not nil
-	// - Close the database connection
-	// - Return any error that occurs
-	return fmt.Errorf("TODO: implement CloseDB function")
-}
diff --git a/labs/lab04/backend/database/connection_test.go b/labs/lab04/backend/database/connection_test.go
deleted file mode 100644
index 915353fff..000000000
--- a/labs/lab04/backend/database/connection_test.go
+++ /dev/null
@@ -1,196 +0,0 @@
-package database
-
-import (
-	"os"
-	"testing"
-	"time"
-)
-
-func TestDefaultConfig(t *testing.T) {
-	config := DefaultConfig()
-
-	if config == nil {
-		t.Fatal("DefaultConfig() returned nil")
-	}
-
-	if config.DatabasePath == "" {
-		t.Error("DefaultConfig() DatabasePath should not be empty")
-	}
-
-	if config.MaxOpenConns <= 0 {
-		t.Error("DefaultConfig() MaxOpenConns should be positive")
-	}
-
-	if config.MaxIdleConns <= 0 {
-		t.Error("DefaultConfig() MaxIdleConns should be positive")
-	}
-
-	if config.ConnMaxLifetime <= 0 {
-		t.Error("DefaultConfig() ConnMaxLifetime should be positive")
-	}
-
-	if config.ConnMaxIdleTime <= 0 {
-		t.Error("DefaultConfig() ConnMaxIdleTime should be positive")
-	}
-}
-
-func TestInitDB(t *testing.T) {
-	// Clean up test database before and after
-	testDB := "./test_init.db"
-	defer os.Remove(testDB)
-	os.Remove(testDB)
-
-	// Test with default config
-	db, err := InitDB()
-	if err != nil {
-		t.Fatalf("InitDB() failed: %v", err)
-	}
-
-	if db == nil {
-		t.Fatal("InitDB() returned nil database")
-	}
-
-	// Test that we can ping the database
-	if err := db.Ping(); err != nil {
-		t.Errorf("Database ping failed: %v", err)
-	}
-
-	// Clean up
-	if err := CloseDB(db); err != nil {
-		t.Errorf("CloseDB() failed: %v", err)
-	}
-}
-
-func TestInitDBWithConfig(t *testing.T) {
-	// Clean up test database before and after
-	testDB := "./test_config.db"
-	defer os.Remove(testDB)
-	os.Remove(testDB)
-
-	// Create custom config
-	config := &Config{
-		DatabasePath:    testDB,
-		MaxOpenConns:    10,
-		MaxIdleConns:    2,
-		ConnMaxLifetime: 2 * time.Minute,
-		ConnMaxIdleTime: 1 * time.Minute,
-	}
-
-	db, err := InitDBWithConfig(config)
-	if err != nil {
-		t.Fatalf("InitDBWithConfig() failed: %v", err)
-	}
-
-	if db == nil {
-		t.Fatal("InitDBWithConfig() returned nil database")
-	}
-
-	// Test that we can ping the database
-	if err := db.Ping(); err != nil {
-		t.Errorf("Database ping failed: %v", err)
-	}
-
-	// Clean up
-	if err := CloseDB(db); err != nil {
-		t.Errorf("CloseDB() failed: %v", err)
-	}
-}
-
-func TestMigrate(t *testing.T) {
-	// Clean up test database before and after
-	testDB := "./test_migrate.db"
-	defer os.Remove(testDB)
-	os.Remove(testDB)
-
-	config := &Config{
-		DatabasePath:    testDB,
-		MaxOpenConns:    5,
-		MaxIdleConns:    1,
-		ConnMaxLifetime: 1 * time.Minute,
-		ConnMaxIdleTime: 30 * time.Second,
-	}
-
-	db, err := InitDBWithConfig(config)
-	if err != nil {
-		t.Fatalf("InitDBWithConfig() failed: %v", err)
-	}
-	defer CloseDB(db)
-
-	// Test migration
-	err = RunMigrations(db)
-	if err != nil {
-		t.Fatalf("RunMigrations() failed: %v", err)
-	}
-
-	// Test that tables were created by checking if we can query them
-	_, err = db.Exec("SELECT COUNT(*) FROM users")
-	if err != nil {
-		t.Errorf("Users table not created properly: %v", err)
-	}
-
-	_, err = db.Exec("SELECT COUNT(*) FROM posts")
-	if err != nil {
-		t.Errorf("Posts table not created properly: %v", err)
-	}
-
-	// Test that we can insert data (basic schema validation)
-	_, err = db.Exec(`
-		INSERT INTO users (name, email, created_at, updated_at) 
-		VALUES ('Test User', 'test@example.com', datetime('now'), datetime('now'))
-	`)
-	if err != nil {
-		t.Errorf("Cannot insert into users table: %v", err)
-	}
-
-	// Get the user ID for the post test
-	var userID int
-	err = db.QueryRow("SELECT id FROM users WHERE email = 'test@example.com'").Scan(&userID)
-	if err != nil {
-		t.Errorf("Cannot query user: %v", err)
-	}
-
-	_, err = db.Exec(`
-		INSERT INTO posts (user_id, title, content, published, created_at, updated_at)
-		VALUES (?, 'Test Post', 'Test content', 1, datetime('now'), datetime('now'))
-	`, userID)
-	if err != nil {
-		t.Errorf("Cannot insert into posts table: %v", err)
-	}
-}
-
-func TestCloseDB(t *testing.T) {
-	// Test closing nil database
-	err := CloseDB(nil)
-	if err == nil {
-		t.Error("CloseDB(nil) should return an error")
-	}
-
-	// Test closing valid database
-	testDB := "./test_close.db"
-	defer os.Remove(testDB)
-	os.Remove(testDB)
-
-	config := &Config{
-		DatabasePath:    testDB,
-		MaxOpenConns:    5,
-		MaxIdleConns:    1,
-		ConnMaxLifetime: 1 * time.Minute,
-		ConnMaxIdleTime: 30 * time.Second,
-	}
-
-	db, err := InitDBWithConfig(config)
-	if err != nil {
-		t.Fatalf("InitDBWithConfig() failed: %v", err)
-	}
-
-	err = CloseDB(db)
-	if err != nil {
-		t.Errorf("CloseDB() failed: %v", err)
-	}
-
-	// Test that database is actually closed
-	err = db.Ping()
-	if err == nil {
-		t.Error("Database should be closed and ping should fail")
-	}
-}
diff --git a/labs/lab04/backend/database/migrations.go b/labs/lab04/backend/database/migrations.go
deleted file mode 100644
index 08f61adf0..000000000
--- a/labs/lab04/backend/database/migrations.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package database
-
-import (
-	"database/sql"
-	"fmt"
-
-	"github.com/pressly/goose/v3"
-)
-
-// RunMigrations runs database migrations using goose
-func RunMigrations(db *sql.DB) error {
-	if db == nil {
-		return fmt.Errorf("database connection cannot be nil")
-	}
-
-	// Set goose dialect for SQLite
-	if err := goose.SetDialect("sqlite3"); err != nil {
-		return fmt.Errorf("failed to set goose dialect: %v", err)
-	}
-
-	// Get path to migrations directory (relative to backend directory)
-	migrationsDir := "../migrations"
-
-	// Run migrations from the migrations directory
-	if err := goose.Up(db, migrationsDir); err != nil {
-		return fmt.Errorf("failed to run migrations: %v", err)
-	}
-
-	return nil
-}
-
-// TODO: Implement this function
-// RollbackMigration rolls back the last migration using goose
-func RollbackMigration(db *sql.DB) error {
-	return nil
-}
-
-// TODO: Implement this function
-// GetMigrationStatus checks migration status using goose
-func GetMigrationStatus(db *sql.DB) error {
-	return nil
-}
-
-// TODO: Implement this function
-// CreateMigration creates a new migration file
-func CreateMigration(name string) error {
-	return nil
-}
diff --git a/labs/lab04/backend/go.mod b/labs/lab04/backend/go.mod
deleted file mode 100644
index 51ffc7e54..000000000
--- a/labs/lab04/backend/go.mod
+++ /dev/null
@@ -1,22 +0,0 @@
-module lab04-backend
-
-go 1.24
-
-require (
-	github.com/Masterminds/squirrel v1.5.4
-	github.com/mattn/go-sqlite3 v1.14.22
-	github.com/pressly/goose/v3 v3.24.3
-	gorm.io/gorm v1.25.12
-)
-
-require (
-	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
-	github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
-	github.com/mfridman/interpolate v0.0.2 // indirect
-	github.com/sethvargo/go-retry v0.3.0 // indirect
-	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/sync v0.14.0 // indirect
-	golang.org/x/text v0.25.0 // indirect
-)
diff --git a/labs/lab04/backend/go.sum b/labs/lab04/backend/go.sum
deleted file mode 100644
index a4aff6f60..000000000
--- a/labs/lab04/backend/go.sum
+++ /dev/null
@@ -1,57 +0,0 @@
-github.com/Masterminds/squirrel v1.5.4 h1:uUcX/aBc8O7Fg9kaISIUsHXdKuqehiXAMQTYX8afzqM=
-github.com/Masterminds/squirrel v1.5.4/go.mod h1:NNaOrjSoIDfDA40n7sr2tPNZRfjzjA400rg+riTZj10=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
-github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
-github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
-github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
-github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
-github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 h1:SOEGU9fKiNWd/HOJuq6+3iTQz8KNCLtVX6idSoTLdUw=
-github.com/lann/builder v0.0.0-20180802200727-47ae307949d0/go.mod h1:dXGbAdH5GtBTC4WfIxhKZfyBF/HBFgRZSWwZ9g/He9o=
-github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 h1:P6pPBnrTSX3DEVR4fDembhRWSsG5rVo6hYhAB/ADZrk=
-github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0/go.mod h1:vmVJ0l/dxyfGW6FmdpVm2joNMFikkuWg0EoCKLGUMNw=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
-github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-github.com/mfridman/interpolate v0.0.2 h1:pnuTK7MQIxxFz1Gr+rjSIx9u7qVjf5VOoM/u6BbAxPY=
-github.com/mfridman/interpolate v0.0.2/go.mod h1:p+7uk6oE07mpE/Ik1b8EckO0O4ZXiGAfshKBWLUM9Xg=
-github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
-github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/pressly/goose/v3 v3.24.3 h1:DSWWNwwggVUsYZ0X2VitiAa9sKuqtBfe+Jr9zFGwWlM=
-github.com/pressly/goose/v3 v3.24.3/go.mod h1:v9zYL4xdViLHCUUJh/mhjnm6JrK7Eul8AS93IxiZM4E=
-github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
-github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
-github.com/sethvargo/go-retry v0.3.0 h1:EEt31A35QhrcRZtrYFDTBg91cqZVnFL2navjDrah2SE=
-github.com/sethvargo/go-retry v0.3.0/go.mod h1:mNX17F0C/HguQMyMyJxcnU471gOZGxCLyYaFyAZraas=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
-github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
-go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
-golang.org/x/exp v0.0.0-20250506013437-ce4c2cf36ca6 h1:y5zboxd6LQAqYIhHnB48p0ByQ/GnQx2BE33L8BOHQkI=
-golang.org/x/exp v0.0.0-20250506013437-ce4c2cf36ca6/go.mod h1:U6Lno4MTRCDY+Ba7aCcauB9T60gsv5s4ralQzP72ZoQ=
-golang.org/x/sync v0.14.0 h1:woo0S4Yywslg6hp4eUFjTVOyKt0RookbpAHG4c1HmhQ=
-golang.org/x/sync v0.14.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
-golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
-golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gorm.io/gorm v1.25.12 h1:I0u8i2hWQItBq1WfE0o2+WuL9+8L21K9e2HHSTE/0f8=
-gorm.io/gorm v1.25.12/go.mod h1:xh7N7RHfYlNc5EmcI/El95gXusucDrQnHXe0+CgWcLQ=
-modernc.org/libc v1.65.0 h1:e183gLDnAp9VJh6gWKdTy0CThL9Pt7MfcR/0bgb7Y1Y=
-modernc.org/libc v1.65.0/go.mod h1:7m9VzGq7APssBTydds2zBcxGREwvIGpuUBaKTXdm2Qs=
-modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
-modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
-modernc.org/memory v1.10.0 h1:fzumd51yQ1DxcOxSO+S6X7+QTuVU+n8/Aj7swYjFfC4=
-modernc.org/memory v1.10.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
-modernc.org/sqlite v1.37.0 h1:s1TMe7T3Q3ovQiK2Ouz4Jwh7dw4ZDqbebSDTlSJdfjI=
-modernc.org/sqlite v1.37.0/go.mod h1:5YiWv+YviqGMuGw4V+PNplcyaJ5v+vQd7TQOgkACoJM=
diff --git a/labs/lab04/backend/main.go b/labs/lab04/backend/main.go
deleted file mode 100644
index 501ef29ba..000000000
--- a/labs/lab04/backend/main.go
+++ /dev/null
@@ -1,37 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-
-	"lab04-backend/database"
-	"lab04-backend/repository"
-
-	_ "github.com/mattn/go-sqlite3"
-)
-
-func main() {
-	// TODO: Initialize database connection
-	db, err := database.InitDB()
-	if err != nil {
-		log.Fatal("Failed to initialize database:", err)
-	}
-	defer db.Close()
-
-	// TODO: Run migrations (using goose-based approach)
-	if err := database.RunMigrations(db); err != nil {
-		log.Fatal("Failed to run migrations:", err)
-	}
-
-	// TODO: Create repository instances
-	userRepo := repository.NewUserRepository(db)
-	postRepo := repository.NewPostRepository(db)
-
-	// Demo operations
-	fmt.Println("Database initialized successfully!")
-	fmt.Printf("User repository: %T\n", userRepo)
-	fmt.Printf("Post repository: %T\n", postRepo)
-
-	// TODO: Add some demo data operations here
-	// You can test your CRUD operations
-}
diff --git a/labs/lab04/backend/migrations/20250708090008_create_users_table.sql b/labs/lab04/backend/migrations/20250708090008_create_users_table.sql
deleted file mode 100644
index cf82e01c3..000000000
--- a/labs/lab04/backend/migrations/20250708090008_create_users_table.sql
+++ /dev/null
@@ -1,27 +0,0 @@
--- +goose Up
--- +goose StatementBegin
--- Create users table with proper schema
-CREATE TABLE users (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name VARCHAR(100) NOT NULL,
-    email VARCHAR(255) UNIQUE NOT NULL,
-    password_hash VARCHAR(255),
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    deleted_at DATETIME NULL
-);
-
--- Create index for efficient email lookups
-CREATE INDEX idx_users_email ON users(email);
-
--- Create index for soft delete queries
-CREATE INDEX idx_users_deleted_at ON users(deleted_at);
--- +goose StatementEnd
-
--- +goose Down
--- +goose StatementBegin
--- Drop the users table and its indexes
-DROP INDEX IF EXISTS idx_users_deleted_at;
-DROP INDEX IF EXISTS idx_users_email;
-DROP TABLE users;
--- +goose StatementEnd
diff --git a/labs/lab04/backend/migrations/20250708090034_create_posts_table.sql b/labs/lab04/backend/migrations/20250708090034_create_posts_table.sql
deleted file mode 100644
index 2f34b6d5d..000000000
--- a/labs/lab04/backend/migrations/20250708090034_create_posts_table.sql
+++ /dev/null
@@ -1,37 +0,0 @@
--- +goose Up
--- +goose StatementBegin
--- Create posts table with foreign key relationship to users
-CREATE TABLE posts (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    user_id INTEGER NOT NULL,
-    title VARCHAR(200) NOT NULL,
-    content TEXT,
-    published BOOLEAN DEFAULT FALSE,
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    deleted_at DATETIME NULL,
-    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
-);
-
--- Create index for user posts lookup
-CREATE INDEX idx_posts_user_id ON posts(user_id);
-
--- Create index for published posts
-CREATE INDEX idx_posts_published ON posts(published);
-
--- Create index for soft delete queries
-CREATE INDEX idx_posts_deleted_at ON posts(deleted_at);
-
--- Create composite index for common queries
-CREATE INDEX idx_posts_user_published ON posts(user_id, published);
--- +goose StatementEnd
-
--- +goose Down
--- +goose StatementBegin
--- Drop the posts table and its indexes
-DROP INDEX IF EXISTS idx_posts_user_published;
-DROP INDEX IF EXISTS idx_posts_deleted_at;
-DROP INDEX IF EXISTS idx_posts_published;
-DROP INDEX IF EXISTS idx_posts_user_id;
-DROP TABLE posts;
--- +goose StatementEnd
diff --git a/labs/lab04/backend/migrations/20250708090055_create_categories_table.sql b/labs/lab04/backend/migrations/20250708090055_create_categories_table.sql
deleted file mode 100644
index ca5db60bd..000000000
--- a/labs/lab04/backend/migrations/20250708090055_create_categories_table.sql
+++ /dev/null
@@ -1,43 +0,0 @@
--- +goose Up
--- +goose StatementBegin
--- Create categories table for GORM example
-CREATE TABLE categories (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name VARCHAR(100) NOT NULL UNIQUE,
-    description VARCHAR(500),
-    color VARCHAR(7), -- Hex color code
-    active BOOLEAN DEFAULT TRUE,
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    deleted_at DATETIME NULL -- For GORM soft delete
-);
-
--- Create many-to-many junction table for posts and categories
-CREATE TABLE post_categories (
-    post_id INTEGER NOT NULL,
-    category_id INTEGER NOT NULL,
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    PRIMARY KEY (post_id, category_id),
-    FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE,
-    FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE CASCADE
-);
-
--- Create indexes for efficient lookups
-CREATE INDEX idx_categories_name ON categories(name);
-CREATE INDEX idx_categories_active ON categories(active);
-CREATE INDEX idx_categories_deleted_at ON categories(deleted_at);
-CREATE INDEX idx_post_categories_post_id ON post_categories(post_id);
-CREATE INDEX idx_post_categories_category_id ON post_categories(category_id);
--- +goose StatementEnd
-
--- +goose Down
--- +goose StatementBegin
--- Drop the categories tables and indexes
-DROP INDEX IF EXISTS idx_post_categories_category_id;
-DROP INDEX IF EXISTS idx_post_categories_post_id;
-DROP INDEX IF EXISTS idx_categories_deleted_at;
-DROP INDEX IF EXISTS idx_categories_active;
-DROP INDEX IF EXISTS idx_categories_name;
-DROP TABLE post_categories;
-DROP TABLE categories;
--- +goose StatementEnd
diff --git a/labs/lab04/backend/models/category.go b/labs/lab04/backend/models/category.go
deleted file mode 100644
index 058435605..000000000
--- a/labs/lab04/backend/models/category.go
+++ /dev/null
@@ -1,127 +0,0 @@
-package models
-
-import (
-	"time"
-
-	"gorm.io/gorm"
-)
-
-// Category represents a blog post category using GORM model conventions
-// This model demonstrates GORM ORM patterns and relationships
-type Category struct {
-	ID          uint           `json:"id" gorm:"primaryKey"`
-	Name        string         `json:"name" gorm:"size:100;not null;uniqueIndex"`
-	Description string         `json:"description" gorm:"size:500"`
-	Color       string         `json:"color" gorm:"size:7"` // Hex color code
-	Active      bool           `json:"active" gorm:"default:true"`
-	CreatedAt   time.Time      `json:"created_at" gorm:"autoCreateTime"`
-	UpdatedAt   time.Time      `json:"updated_at" gorm:"autoUpdateTime"`
-	DeletedAt   gorm.DeletedAt `json:"-" gorm:"index"` // Soft delete support
-
-	// GORM Associations (demonstrates ORM relationships)
-	Posts []Post `json:"posts,omitempty" gorm:"many2many:post_categories;"`
-}
-
-// CreateCategoryRequest represents the payload for creating a category
-type CreateCategoryRequest struct {
-	Name        string `json:"name" validate:"required,min=2,max=100"`
-	Description string `json:"description" validate:"max=500"`
-	Color       string `json:"color" validate:"omitempty,hexcolor"`
-}
-
-// UpdateCategoryRequest represents the payload for updating a category
-type UpdateCategoryRequest struct {
-	Name        *string `json:"name,omitempty" validate:"omitempty,min=2,max=100"`
-	Description *string `json:"description,omitempty" validate:"omitempty,max=500"`
-	Color       *string `json:"color,omitempty" validate:"omitempty,hexcolor"`
-	Active      *bool   `json:"active,omitempty"`
-}
-
-// TODO: Implement GORM model methods and hooks
-
-// TableName specifies the table name for GORM (optional - GORM auto-infers)
-func (Category) TableName() string {
-	return "categories"
-}
-
-// TODO: Implement BeforeCreate hook
-func (c *Category) BeforeCreate(tx *gorm.DB) error {
-	// TODO: GORM BeforeCreate hook
-	// - Validate data before creation
-	// - Set default values
-	// - Perform any pre-creation logic
-	// Example: if c.Color == "" { c.Color = "#007bff" }
-	return nil
-}
-
-// TODO: Implement AfterCreate hook
-func (c *Category) AfterCreate(tx *gorm.DB) error {
-	// TODO: GORM AfterCreate hook
-	// - Log creation
-	// - Send notifications
-	// - Update cache
-	// Example: log.Printf("Category created: %s", c.Name)
-	return nil
-}
-
-// TODO: Implement BeforeUpdate hook
-func (c *Category) BeforeUpdate(tx *gorm.DB) error {
-	// TODO: GORM BeforeUpdate hook
-	// - Validate changes
-	// - Prevent certain updates
-	// - Clean up related data
-	return nil
-}
-
-// TODO: Implement Validate method for CreateCategoryRequest
-func (req *CreateCategoryRequest) Validate() error {
-	// TODO: Add validation logic for GORM model
-	// - Name should be unique (checked at database level via GORM)
-	// - Color should be valid hex color
-	// - Description should not exceed limits
-	// Example using validator package:
-	// return validator.New().Struct(req)
-	return nil
-}
-
-// TODO: Implement ToCategory method
-func (req *CreateCategoryRequest) ToCategory() *Category {
-	// TODO: Convert request to GORM model
-	// - Map fields from request to model
-	// - Set default values
-	// Example:
-	// return &Category{
-	//     Name:        req.Name,
-	//     Description: req.Description,
-	//     Color:       req.Color,
-	//     Active:      true,
-	// }
-	return nil
-}
-
-// TODO: Implement GORM scopes (reusable query logic)
-func ActiveCategories(db *gorm.DB) *gorm.DB {
-	// TODO: GORM scope for active categories
-	// return db.Where("active = ?", true)
-	return db
-}
-
-func CategoriesWithPosts(db *gorm.DB) *gorm.DB {
-	// TODO: GORM scope for categories with posts
-	// return db.Joins("Posts").Where("posts.id IS NOT NULL")
-	return db
-}
-
-// TODO: Implement model validation methods
-func (c *Category) IsActive() bool {
-	// TODO: Check if category is active
-	return c.Active
-}
-
-func (c *Category) PostCount(db *gorm.DB) (int64, error) {
-	// TODO: Get post count for this category using GORM association
-	// var count int64
-	// err := db.Model(c).Association("Posts").Count(&count)
-	// return count, err
-	return 0, nil
-}
diff --git a/labs/lab04/backend/models/post.go b/labs/lab04/backend/models/post.go
deleted file mode 100644
index a0fb29b92..000000000
--- a/labs/lab04/backend/models/post.go
+++ /dev/null
@@ -1,73 +0,0 @@
-package models
-
-import (
-	"database/sql"
-	"time"
-)
-
-// Post represents a blog post in the system
-type Post struct {
-	ID        int       `json:"id" db:"id"`
-	UserID    int       `json:"user_id" db:"user_id"`
-	Title     string    `json:"title" db:"title"`
-	Content   string    `json:"content" db:"content"`
-	Published bool      `json:"published" db:"published"`
-	CreatedAt time.Time `json:"created_at" db:"created_at"`
-	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
-}
-
-// CreatePostRequest represents the payload for creating a post
-type CreatePostRequest struct {
-	UserID    int    `json:"user_id"`
-	Title     string `json:"title"`
-	Content   string `json:"content"`
-	Published bool   `json:"published"`
-}
-
-// UpdatePostRequest represents the payload for updating a post
-type UpdatePostRequest struct {
-	Title     *string `json:"title,omitempty"`
-	Content   *string `json:"content,omitempty"`
-	Published *bool   `json:"published,omitempty"`
-}
-
-// TODO: Implement Validate method for Post
-func (p *Post) Validate() error {
-	// TODO: Add validation logic
-	// - Title should not be empty and should be at least 5 characters
-	// - Content should not be empty if published is true
-	// - UserID should be greater than 0
-	// Return appropriate errors if validation fails
-	return nil
-}
-
-// TODO: Implement Validate method for CreatePostRequest
-func (req *CreatePostRequest) Validate() error {
-	// TODO: Add validation logic
-	// - Title should not be empty and should be at least 5 characters
-	// - UserID should be greater than 0
-	// - Content should not be empty if published is true
-	// Return appropriate errors if validation fails
-	return nil
-}
-
-// TODO: Implement ToPost method for CreatePostRequest
-func (req *CreatePostRequest) ToPost() *Post {
-	// TODO: Convert CreatePostRequest to Post
-	// Set timestamps to current time
-	return nil
-}
-
-// TODO: Implement ScanRow method for Post
-func (p *Post) ScanRow(row *sql.Row) error {
-	// TODO: Scan database row into Post struct
-	// Handle the case where row might be nil
-	return nil
-}
-
-// TODO: Implement ScanRows method for Post slice
-func ScanPosts(rows *sql.Rows) ([]Post, error) {
-	// TODO: Scan multiple database rows into Post slice
-	// Make sure to close rows and handle errors properly
-	return nil, nil
-}
diff --git a/labs/lab04/backend/models/user.go b/labs/lab04/backend/models/user.go
deleted file mode 100644
index 30b4c17ec..000000000
--- a/labs/lab04/backend/models/user.go
+++ /dev/null
@@ -1,66 +0,0 @@
-package models
-
-import (
-	"database/sql"
-	"time"
-)
-
-// User represents a user in the system
-type User struct {
-	ID        int       `json:"id" db:"id"`
-	Name      string    `json:"name" db:"name"`
-	Email     string    `json:"email" db:"email"`
-	CreatedAt time.Time `json:"created_at" db:"created_at"`
-	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
-}
-
-// CreateUserRequest represents the payload for creating a user
-type CreateUserRequest struct {
-	Name  string `json:"name"`
-	Email string `json:"email"`
-}
-
-// UpdateUserRequest represents the payload for updating a user
-type UpdateUserRequest struct {
-	Name  *string `json:"name,omitempty"`
-	Email *string `json:"email,omitempty"`
-}
-
-// TODO: Implement Validate method for User
-func (u *User) Validate() error {
-	// TODO: Add validation logic
-	// - Name should not be empty and should be at least 2 characters
-	// - Email should be valid format
-	// Return appropriate errors if validation fails
-	return nil
-}
-
-// TODO: Implement Validate method for CreateUserRequest
-func (req *CreateUserRequest) Validate() error {
-	// TODO: Add validation logic
-	// - Name should not be empty and should be at least 2 characters
-	// - Email should be valid format and not empty
-	// Return appropriate errors if validation fails
-	return nil
-}
-
-// TODO: Implement ToUser method for CreateUserRequest
-func (req *CreateUserRequest) ToUser() *User {
-	// TODO: Convert CreateUserRequest to User
-	// Set timestamps to current time
-	return nil
-}
-
-// TODO: Implement ScanRow method for User
-func (u *User) ScanRow(row *sql.Row) error {
-	// TODO: Scan database row into User struct
-	// Handle the case where row might be nil
-	return nil
-}
-
-// TODO: Implement ScanRows method for User slice
-func ScanUsers(rows *sql.Rows) ([]User, error) {
-	// TODO: Scan multiple database rows into User slice
-	// Make sure to close rows and handle errors properly
-	return nil, nil
-}
diff --git a/labs/lab04/backend/models/user_test.go b/labs/lab04/backend/models/user_test.go
deleted file mode 100644
index 726d2ad2b..000000000
--- a/labs/lab04/backend/models/user_test.go
+++ /dev/null
@@ -1,145 +0,0 @@
-package models
-
-import (
-	"testing"
-	"time"
-)
-
-func TestUser_Validate(t *testing.T) {
-	tests := []struct {
-		name    string
-		user    User
-		wantErr bool
-	}{
-		{
-			name: "valid user",
-			user: User{
-				Name:  "John Doe",
-				Email: "john@example.com",
-			},
-			wantErr: false,
-		},
-		{
-			name: "empty name",
-			user: User{
-				Name:  "",
-				Email: "john@example.com",
-			},
-			wantErr: true,
-		},
-		{
-			name: "short name",
-			user: User{
-				Name:  "J",
-				Email: "john@example.com",
-			},
-			wantErr: true,
-		},
-		{
-			name: "invalid email",
-			user: User{
-				Name:  "John Doe",
-				Email: "not-an-email",
-			},
-			wantErr: true,
-		},
-		{
-			name: "empty email",
-			user: User{
-				Name:  "John Doe",
-				Email: "",
-			},
-			wantErr: true,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			err := tt.user.Validate()
-			if (err != nil) != tt.wantErr {
-				t.Errorf("User.Validate() error = %v, wantErr %v", err, tt.wantErr)
-			}
-		})
-	}
-}
-
-func TestCreateUserRequest_Validate(t *testing.T) {
-	tests := []struct {
-		name    string
-		req     CreateUserRequest
-		wantErr bool
-	}{
-		{
-			name: "valid request",
-			req: CreateUserRequest{
-				Name:  "John Doe",
-				Email: "john@example.com",
-			},
-			wantErr: false,
-		},
-		{
-			name: "empty name",
-			req: CreateUserRequest{
-				Name:  "",
-				Email: "john@example.com",
-			},
-			wantErr: true,
-		},
-		{
-			name: "invalid email",
-			req: CreateUserRequest{
-				Name:  "John Doe",
-				Email: "invalid-email",
-			},
-			wantErr: true,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			err := tt.req.Validate()
-			if (err != nil) != tt.wantErr {
-				t.Errorf("CreateUserRequest.Validate() error = %v, wantErr %v", err, tt.wantErr)
-			}
-		})
-	}
-}
-
-func TestCreateUserRequest_ToUser(t *testing.T) {
-	req := CreateUserRequest{
-		Name:  "John Doe",
-		Email: "john@example.com",
-	}
-
-	user := req.ToUser()
-	if user == nil {
-		t.Fatal("ToUser() returned nil")
-	}
-
-	if user.Name != req.Name {
-		t.Errorf("ToUser() name = %v, want %v", user.Name, req.Name)
-	}
-
-	if user.Email != req.Email {
-		t.Errorf("ToUser() email = %v, want %v", user.Email, req.Email)
-	}
-
-	// Check that timestamps are set
-	if user.CreatedAt.IsZero() {
-		t.Error("ToUser() CreatedAt should not be zero")
-	}
-
-	if user.UpdatedAt.IsZero() {
-		t.Error("ToUser() UpdatedAt should not be zero")
-	}
-
-	// Check that timestamps are recent (within last minute)
-	now := time.Now()
-	if now.Sub(user.CreatedAt) > time.Minute {
-		t.Error("ToUser() CreatedAt should be recent")
-	}
-
-	if now.Sub(user.UpdatedAt) > time.Minute {
-		t.Error("ToUser() UpdatedAt should be recent")
-	}
-}
diff --git a/labs/lab04/backend/repository/category_repository.go b/labs/lab04/backend/repository/category_repository.go
deleted file mode 100644
index 11d91bbe8..000000000
--- a/labs/lab04/backend/repository/category_repository.go
+++ /dev/null
@@ -1,167 +0,0 @@
-package repository
-
-import (
-	"fmt"
-
-	"lab04-backend/models"
-
-	"gorm.io/gorm"
-)
-
-// CategoryRepository handles database operations for categories using GORM
-// This repository demonstrates GORM ORM approach for database operations
-type CategoryRepository struct {
-	db *gorm.DB
-}
-
-// NewCategoryRepository creates a new CategoryRepository with GORM
-func NewCategoryRepository(gormDB *gorm.DB) *CategoryRepository {
-	return &CategoryRepository{db: gormDB}
-}
-
-// TODO: Implement Create method using GORM
-func (r *CategoryRepository) Create(category *models.Category) error {
-	// TODO: Create a new category using GORM
-	// - Use GORM's Create method: r.db.Create(category)
-	// - GORM automatically handles ID generation and timestamps
-	// - No need for manual SQL or RETURNING clauses
-	// Example: result := r.db.Create(category)
-	// return result.Error
-	//
-	// Notice how much simpler this is compared to manual SQL!
-	return fmt.Errorf("TODO: implement Create method with GORM")
-}
-
-// TODO: Implement GetByID method using GORM
-func (r *CategoryRepository) GetByID(id uint) (*models.Category, error) {
-	// TODO: Get category by ID using GORM
-	// - Use GORM's First method: r.db.First(&category, id)
-	// - GORM automatically generates the WHERE clause
-	// - Returns gorm.ErrRecordNotFound if not found
-	// Example:
-	// var category models.Category
-	// result := r.db.First(&category, id)
-	// return &category, result.Error
-	//
-	// Much cleaner than manual row scanning!
-	return nil, fmt.Errorf("TODO: implement GetByID method with GORM")
-}
-
-// TODO: Implement GetAll method using GORM
-func (r *CategoryRepository) GetAll() ([]models.Category, error) {
-	// TODO: Get all categories using GORM
-	// - Use GORM's Find method: r.db.Find(&categories)
-	// - GORM automatically handles the slice allocation
-	// - Can add Order() for sorting: r.db.Order("name").Find(&categories)
-	// Example:
-	// var categories []models.Category
-	// result := r.db.Order("name").Find(&categories)
-	// return categories, result.Error
-	return nil, fmt.Errorf("TODO: implement GetAll method with GORM")
-}
-
-// TODO: Implement Update method using GORM
-func (r *CategoryRepository) Update(category *models.Category) error {
-	// TODO: Update category using GORM
-	// - Use GORM's Save method: r.db.Save(category)
-	// - GORM automatically updates only changed fields
-	// - Handles updated_at timestamp automatically
-	// - Alternative: r.db.Model(category).Updates(updates)
-	//
-	// Example:
-	// result := r.db.Save(category)
-	// return result.Error
-	return fmt.Errorf("TODO: implement Update method with GORM")
-}
-
-// TODO: Implement Delete method using GORM
-func (r *CategoryRepository) Delete(id uint) error {
-	// TODO: Delete category using GORM
-	// - Use GORM's Delete method: r.db.Delete(&models.Category{}, id)
-	// - GORM can do soft delete if model has DeletedAt field
-	// - For hard delete: r.db.Unscoped().Delete(&models.Category{}, id)
-	//
-	// Example:
-	// result := r.db.Delete(&models.Category{}, id)
-	// return result.Error
-	return fmt.Errorf("TODO: implement Delete method with GORM")
-}
-
-// TODO: Implement FindByName method using GORM
-func (r *CategoryRepository) FindByName(name string) (*models.Category, error) {
-	// TODO: Find category by name using GORM
-	// - Use GORM's Where method: r.db.Where("name = ?", name).First(&category)
-	// - GORM handles SQL injection protection automatically
-	// - Can use struct for conditions: r.db.Where(&models.Category{Name: name}).First(&category)
-	//
-	// Example:
-	// var category models.Category
-	// result := r.db.Where("name = ?", name).First(&category)
-	// return &category, result.Error
-	return nil, fmt.Errorf("TODO: implement FindByName method with GORM")
-}
-
-// TODO: Implement SearchCategories method using GORM
-func (r *CategoryRepository) SearchCategories(query string, limit int) ([]models.Category, error) {
-	// TODO: Search categories using GORM
-	// - Use GORM's Where with LIKE: r.db.Where("name LIKE ?", "%"+query+"%")
-	// - Add Limit: .Limit(limit)
-	// - Add Order: .Order("name")
-	//
-	// Example:
-	// var categories []models.Category
-	// result := r.db.Where("name LIKE ?", "%"+query+"%").
-	//               Order("name").
-	//               Limit(limit).
-	//               Find(&categories)
-	// return categories, result.Error
-	return nil, fmt.Errorf("TODO: implement SearchCategories method with GORM")
-}
-
-// TODO: Implement GetCategoriesWithPosts method using GORM associations
-func (r *CategoryRepository) GetCategoriesWithPosts() ([]models.Category, error) {
-	// TODO: Get categories with associated posts using GORM
-	// - Use GORM's Preload to load associations: r.db.Preload("Posts").Find(&categories)
-	// - GORM automatically handles the JOINs and relationships
-	// - Much simpler than manual JOIN queries!
-	//
-	// Example:
-	// var categories []models.Category
-	// result := r.db.Preload("Posts").Find(&categories)
-	// return categories, result.Error
-	//
-	// This assumes Category model has Posts relationship defined
-	return nil, fmt.Errorf("TODO: implement GetCategoriesWithPosts method with GORM Preload")
-}
-
-// TODO: Implement Count method using GORM
-func (r *CategoryRepository) Count() (int64, error) {
-	// TODO: Count categories using GORM
-	// - Use GORM's Count method: r.db.Model(&models.Category{}).Count(&count)
-	// - GORM returns int64 for count operations
-	//
-	// Example:
-	// var count int64
-	// result := r.db.Model(&models.Category{}).Count(&count)
-	// return count, result.Error
-	return 0, fmt.Errorf("TODO: implement Count method with GORM")
-}
-
-// TODO: Implement Transaction example using GORM
-func (r *CategoryRepository) CreateWithTransaction(categories []models.Category) error {
-	// TODO: Create multiple categories in a transaction using GORM
-	// - Use GORM's Transaction method: r.db.Transaction(func(tx *gorm.DB) error {...})
-	// - GORM automatically handles rollback on error
-	// - Much simpler than manual transaction management!
-	//
-	// Example:
-	// return r.db.Transaction(func(tx *gorm.DB) error {
-	//     for _, category := range categories {
-	//         if err := tx.Create(&category).Error; err != nil {
-	//             return err // GORM will rollback automatically
-	//         }
-	//     }
-	//     return nil // GORM will commit automatically
-	// })
-	return fmt.Errorf("TODO: implement CreateWithTransaction method with GORM")
-}
diff --git a/labs/lab04/backend/repository/category_repository_test.go b/labs/lab04/backend/repository/category_repository_test.go
deleted file mode 100644
index d83a9d4a3..000000000
--- a/labs/lab04/backend/repository/category_repository_test.go
+++ /dev/null
@@ -1,271 +0,0 @@
-package repository
-
-import (
-	"testing"
-)
-
-// TestCategoryRepository tests the GORM ORM approach
-func TestCategoryRepository(t *testing.T) {
-	// TODO: Setup GORM database for testing
-	// db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
-	// if err != nil {
-	//     t.Fatalf("Failed to connect to database: %v", err)
-	// }
-
-	// TODO: Auto-migrate models
-	// err = db.AutoMigrate(&models.Category{}, &models.Post{})
-	// if err != nil {
-	//     t.Fatalf("Failed to migrate database: %v", err)
-	// }
-
-	// Create repository instance
-	// categoryRepo := NewCategoryRepository(db)
-
-	// TODO: Test Create method with GORM
-	t.Run("Create category with GORM", func(t *testing.T) {
-		// TODO: Test GORM Create functionality
-		// - Create a category using GORM
-		// - Verify ID is auto-generated
-		// - Verify timestamps are set automatically
-		// - Test validation via GORM hooks
-		//
-		// Example:
-		// category := &models.Category{
-		//     Name: "Technology",
-		//     Description: "Tech-related posts",
-		//     Color: "#007bff",
-		// }
-		// err := categoryRepo.Create(category)
-		// assert.NoError(t, err)
-		// assert.NotZero(t, category.ID)
-		// assert.NotZero(t, category.CreatedAt)
-
-		t.Skip("TODO: implement GORM Create test")
-	})
-
-	// TODO: Test GetByID method with GORM
-	t.Run("GetByID with GORM", func(t *testing.T) {
-		// TODO: Test GORM First functionality
-		// - Create test category
-		// - Retrieve by ID using GORM
-		// - Test record not found handling
-		//
-		// Example:
-		// category, err := categoryRepo.GetByID(1)
-		// assert.NoError(t, err)
-		// assert.Equal(t, "Technology", category.Name)
-		//
-		// // Test not found
-		// _, err = categoryRepo.GetByID(999)
-		// assert.Error(t, err)
-		// assert.Equal(t, gorm.ErrRecordNotFound, err)
-
-		t.Skip("TODO: implement GORM GetByID test")
-	})
-
-	// TODO: Test GetAll method with GORM
-	t.Run("GetAll with GORM", func(t *testing.T) {
-		// TODO: Test GORM Find functionality
-		// - Create multiple categories
-		// - Retrieve all using GORM
-		// - Test ordering
-		//
-		// Example:
-		// categories, err := categoryRepo.GetAll()
-		// assert.NoError(t, err)
-		// assert.Len(t, categories, 3)
-		// // Verify ordering by name
-		// assert.Equal(t, "Category A", categories[0].Name)
-
-		t.Skip("TODO: implement GORM GetAll test")
-	})
-
-	// TODO: Test Update method with GORM
-	t.Run("Update with GORM", func(t *testing.T) {
-		// TODO: Test GORM Save/Updates functionality
-		// - Create category
-		// - Update using GORM
-		// - Verify updated_at is automatically set
-		// - Test partial updates
-		//
-		// Example:
-		// category.Name = "Updated Technology"
-		// err := categoryRepo.Update(category)
-		// assert.NoError(t, err)
-		// assert.Equal(t, "Updated Technology", category.Name)
-		// assert.True(t, category.UpdatedAt.After(originalUpdatedAt))
-
-		t.Skip("TODO: implement GORM Update test")
-	})
-
-	// TODO: Test Delete method with GORM
-	t.Run("Delete with GORM", func(t *testing.T) {
-		// TODO: Test GORM Delete functionality
-		// - Test soft delete (if DeletedAt field exists)
-		// - Test hard delete (with Unscoped)
-		// - Verify cascade behavior
-		//
-		// Example:
-		// err := categoryRepo.Delete(category.ID)
-		// assert.NoError(t, err)
-		//
-		// // Verify soft delete
-		// _, err = categoryRepo.GetByID(category.ID)
-		// assert.Error(t, err)
-		// assert.Equal(t, gorm.ErrRecordNotFound, err)
-
-		t.Skip("TODO: implement GORM Delete test")
-	})
-
-	// TODO: Test FindByName method with GORM
-	t.Run("FindByName with GORM", func(t *testing.T) {
-		// TODO: Test GORM Where functionality
-		// - Test exact matches
-		// - Test case sensitivity
-		// - Test not found scenarios
-		//
-		// Example:
-		// category, err := categoryRepo.FindByName("Technology")
-		// assert.NoError(t, err)
-		// assert.Equal(t, "Technology", category.Name)
-
-		t.Skip("TODO: implement GORM FindByName test")
-	})
-
-	// TODO: Test SearchCategories method with GORM
-	t.Run("SearchCategories with GORM", func(t *testing.T) {
-		// TODO: Test GORM LIKE functionality
-		// - Test partial name matches
-		// - Test limit functionality
-		// - Test ordering
-		//
-		// Example:
-		// categories, err := categoryRepo.SearchCategories("Tech", 10)
-		// assert.NoError(t, err)
-		// assert.True(t, len(categories) <= 10)
-
-		t.Skip("TODO: implement GORM SearchCategories test")
-	})
-
-	// TODO: Test GetCategoriesWithPosts method with GORM Preload
-	t.Run("GetCategoriesWithPosts with GORM Preload", func(t *testing.T) {
-		// TODO: Test GORM Preload functionality
-		// - Create categories and posts
-		// - Test eager loading with Preload
-		// - Verify associations are loaded
-		//
-		// Example:
-		// categories, err := categoryRepo.GetCategoriesWithPosts()
-		// assert.NoError(t, err)
-		// for _, category := range categories {
-		//     assert.NotNil(t, category.Posts) // Posts should be loaded
-		// }
-
-		t.Skip("TODO: implement GORM Preload test")
-	})
-
-	// TODO: Test Count method with GORM
-	t.Run("Count with GORM", func(t *testing.T) {
-		// TODO: Test GORM Count functionality
-		// - Test count with no records
-		// - Test count with multiple records
-		// - Test count with soft deleted records
-		//
-		// Example:
-		// count, err := categoryRepo.Count()
-		// assert.NoError(t, err)
-		// assert.Equal(t, int64(3), count)
-
-		t.Skip("TODO: implement GORM Count test")
-	})
-
-	// TODO: Test Transaction method with GORM
-	t.Run("Transaction with GORM", func(t *testing.T) {
-		// TODO: Test GORM Transaction functionality
-		// - Test successful transaction
-		// - Test transaction rollback on error
-		// - Verify atomicity
-		//
-		// Example:
-		// categories := []models.Category{
-		//     {Name: "Cat1"}, {Name: "Cat2"}, {Name: "Cat3"},
-		// }
-		// err := categoryRepo.CreateWithTransaction(categories)
-		// assert.NoError(t, err)
-
-		t.Skip("TODO: implement GORM Transaction test")
-	})
-}
-
-// TestGORMModelHooks tests GORM model hooks and lifecycle
-func TestGORMModelHooks(t *testing.T) {
-	// TODO: Test GORM hooks
-	t.Run("BeforeCreate hook", func(t *testing.T) {
-		// TODO: Test BeforeCreate hook functionality
-		// - Verify hook is called
-		// - Test data validation in hook
-		// - Test default value setting
-
-		t.Skip("TODO: implement GORM BeforeCreate hook test")
-	})
-
-	t.Run("AfterCreate hook", func(t *testing.T) {
-		// TODO: Test AfterCreate hook functionality
-		// - Verify hook is called after creation
-		// - Test side effects (logging, notifications)
-
-		t.Skip("TODO: implement GORM AfterCreate hook test")
-	})
-
-	t.Run("Validation methods", func(t *testing.T) {
-		// TODO: Test model validation methods
-		// - Test IsActive method
-		// - Test validation constraints
-
-		t.Skip("TODO: implement GORM validation tests")
-	})
-}
-
-// TestGORMScopes tests GORM scopes functionality
-func TestGORMScopes(t *testing.T) {
-	// TODO: Test GORM scopes
-	t.Run("ActiveCategories scope", func(t *testing.T) {
-		// TODO: Test ActiveCategories scope
-		// - Create active and inactive categories
-		// - Test scope filters correctly
-
-		t.Skip("TODO: implement GORM ActiveCategories scope test")
-	})
-
-	t.Run("CategoriesWithPosts scope", func(t *testing.T) {
-		// TODO: Test CategoriesWithPosts scope
-		// - Create categories with and without posts
-		// - Test scope filters correctly
-
-		t.Skip("TODO: implement GORM CategoriesWithPosts scope test")
-	})
-}
-
-// BenchmarkGORMVsSQL benchmarks GORM vs raw SQL performance
-func BenchmarkGORMVsSQL(b *testing.B) {
-	// TODO: Compare GORM vs raw SQL performance
-	b.Run("GORM Create", func(b *testing.B) {
-		// TODO: Benchmark GORM Create operations
-		b.Skip("TODO: implement GORM Create benchmark")
-	})
-
-	b.Run("Raw SQL Create", func(b *testing.B) {
-		// TODO: Benchmark raw SQL Create operations
-		b.Skip("TODO: implement raw SQL Create benchmark")
-	})
-
-	b.Run("GORM Query", func(b *testing.B) {
-		// TODO: Benchmark GORM Query operations
-		b.Skip("TODO: implement GORM Query benchmark")
-	})
-
-	b.Run("Raw SQL Query", func(b *testing.B) {
-		// TODO: Benchmark raw SQL Query operations
-		b.Skip("TODO: implement raw SQL Query benchmark")
-	})
-}
diff --git a/labs/lab04/backend/repository/post_repository.go b/labs/lab04/backend/repository/post_repository.go
deleted file mode 100644
index d75fdf678..000000000
--- a/labs/lab04/backend/repository/post_repository.go
+++ /dev/null
@@ -1,101 +0,0 @@
-package repository
-
-import (
-	"database/sql"
-	"fmt"
-
-	"lab04-backend/models"
-)
-
-// PostRepository handles database operations for posts
-// This repository demonstrates SCANY MAPPING approach for result scanning
-type PostRepository struct {
-	db *sql.DB
-}
-
-// NewPostRepository creates a new PostRepository
-func NewPostRepository(db *sql.DB) *PostRepository {
-	return &PostRepository{db: db}
-}
-
-// TODO: Implement Create method using scany for result mapping
-func (r *PostRepository) Create(req *models.CreatePostRequest) (*models.Post, error) {
-	// TODO: Create a new post in the database using scany for result mapping
-	// - Validate the request using req.Validate()
-	// - Insert into posts table with RETURNING clause
-	// - Use sqlscan.Get() to scan the RETURNING result into a Post struct
-	// Example: sqlscan.Get(context.Background(), r.db, &post, query, args...)
-	// This eliminates manual row scanning compared to user repository
-	return nil, fmt.Errorf("TODO: implement Create method with scany mapping")
-}
-
-// TODO: Implement GetByID method using scany
-func (r *PostRepository) GetByID(id int) (*models.Post, error) {
-	// TODO: Get post by ID from database using scany
-	// - Use sqlscan.Get() instead of manual row.Scan()
-	// Example: sqlscan.Get(context.Background(), r.db, &post, "SELECT * FROM posts WHERE id = $1", id)
-	// Notice how this eliminates the need for manual field scanning
-	return nil, fmt.Errorf("TODO: implement GetByID method with scany")
-}
-
-// TODO: Implement GetByUserID method using scany
-func (r *PostRepository) GetByUserID(userID int) ([]models.Post, error) {
-	// TODO: Get all posts by user ID using scany
-	// - Use sqlscan.Select() for multiple rows instead of manual rows.Next() loop
-	// Example: sqlscan.Select(context.Background(), r.db, &posts, query, userID)
-	// This eliminates manual iteration and scanning
-	return nil, fmt.Errorf("TODO: implement GetByUserID method with scany")
-}
-
-// TODO: Implement GetPublished method using scany
-func (r *PostRepository) GetPublished() ([]models.Post, error) {
-	// TODO: Get all published posts using scany
-	// - Use sqlscan.Select() for multiple rows
-	// - Query posts where published = true
-	// - Order by created_at DESC
-	return nil, fmt.Errorf("TODO: implement GetPublished method with scany")
-}
-
-// TODO: Implement GetAll method using scany
-func (r *PostRepository) GetAll() ([]models.Post, error) {
-	// TODO: Get all posts from database using scany
-	// - Use sqlscan.Select() instead of manual rows iteration
-	// Example: sqlscan.Select(context.Background(), r.db, &posts, "SELECT * FROM posts ORDER BY created_at DESC")
-	// Compare this simplicity with manual scanning in user repository
-	return nil, fmt.Errorf("TODO: implement GetAll method with scany")
-}
-
-// TODO: Implement Update method using scany
-func (r *PostRepository) Update(id int, req *models.UpdatePostRequest) (*models.Post, error) {
-	// TODO: Update post in database using scany
-	// - Build dynamic UPDATE query based on non-nil fields in req
-	// - Update updated_at timestamp
-	// - Use sqlscan.Get() with RETURNING clause to get updated post
-	// This avoids a separate SELECT query after UPDATE
-	return nil, fmt.Errorf("TODO: implement Update method with scany")
-}
-
-// TODO: Implement Delete method (standard SQL)
-func (r *PostRepository) Delete(id int) error {
-	// TODO: Delete post from database
-	// - Delete from posts table by ID
-	// - Return error if post doesn't exist
-	// Note: Delete operations typically don't need scany since no data is returned
-	return fmt.Errorf("TODO: implement Delete method")
-}
-
-// TODO: Implement Count method (standard SQL)
-func (r *PostRepository) Count() (int, error) {
-	// TODO: Count total number of posts
-	// - Return count of posts in database
-	// - Can use standard QueryRow.Scan() for single values like count
-	return 0, fmt.Errorf("TODO: implement Count method")
-}
-
-// TODO: Implement CountByUserID method (standard SQL)
-func (r *PostRepository) CountByUserID(userID int) (int, error) {
-	// TODO: Count posts by user ID
-	// - Return count of posts for specific user
-	// - Use standard QueryRow.Scan() for single integer result
-	return 0, fmt.Errorf("TODO: implement CountByUserID method")
-}
diff --git a/labs/lab04/backend/repository/search_service.go b/labs/lab04/backend/repository/search_service.go
deleted file mode 100644
index e8827aa90..000000000
--- a/labs/lab04/backend/repository/search_service.go
+++ /dev/null
@@ -1,169 +0,0 @@
-package repository
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-
-	"lab04-backend/models"
-
-	"github.com/Masterminds/squirrel"
-)
-
-// SearchService handles dynamic search operations using Squirrel query builder
-// This service demonstrates SQUIRREL QUERY BUILDER approach for dynamic SQL
-type SearchService struct {
-	db   *sql.DB
-	psql squirrel.StatementBuilderType
-}
-
-// SearchFilters represents search parameters
-type SearchFilters struct {
-	Query        string // Search in title and content
-	UserID       *int   // Filter by user ID
-	Published    *bool  // Filter by published status
-	MinWordCount *int   // Minimum word count in content
-	Limit        int    // Results limit (default 50)
-	Offset       int    // Results offset (for pagination)
-	OrderBy      string // Order by field (title, created_at, updated_at)
-	OrderDir     string // Order direction (ASC, DESC)
-}
-
-// NewSearchService creates a new SearchService
-func NewSearchService(db *sql.DB) *SearchService {
-	return &SearchService{
-		db:   db,
-		psql: squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar),
-	}
-}
-
-// TODO: Implement SearchPosts method using Squirrel query builder
-func (s *SearchService) SearchPosts(ctx context.Context, filters SearchFilters) ([]models.Post, error) {
-	// TODO: Build dynamic query using Squirrel instead of string concatenation
-	//
-	// Start with base query:
-	// query := s.psql.Select("id", "user_id", "title", "content", "published", "created_at", "updated_at").
-	//              From("posts")
-	//
-	// Add WHERE conditions dynamically:
-	// - If filters.Query: add ILIKE conditions for title and content
-	// - If filters.UserID: add user_id = ?
-	// - If filters.Published: add published = ?
-	// - If filters.MinWordCount: add word count condition
-	//
-	// Add ORDER BY dynamically:
-	// - Use OrderBy() and validate sort fields
-	//
-	// Add LIMIT/OFFSET:
-	// - Use Limit() and Offset()
-	//
-	// Build final SQL:
-	// sql, args, err := query.ToSql()
-	//
-	// Execute with scany:
-	// var posts []models.Post
-	// err = sqlscan.Select(ctx, s.db, &posts, sql, args...)
-	//
-	// This demonstrates the power of combining Squirrel (dynamic queries)
-	// with scany (automatic result mapping)
-
-	return nil, fmt.Errorf("TODO: implement SearchPosts with Squirrel query builder")
-}
-
-// TODO: Implement SearchUsers method using Squirrel
-func (s *SearchService) SearchUsers(ctx context.Context, nameQuery string, limit int) ([]models.User, error) {
-	// TODO: Build user search query with Squirrel
-	// query := s.psql.Select("id", "name", "email", "created_at", "updated_at").
-	//              From("users").
-	//              Where(squirrel.Like{"name": "%" + nameQuery + "%"}).
-	//              OrderBy("name").
-	//              Limit(uint64(limit))
-	//
-	// sql, args, err := query.ToSql()
-	// var users []models.User
-	// err = sqlscan.Select(ctx, s.db, &users, sql, args...)
-
-	return nil, fmt.Errorf("TODO: implement SearchUsers with Squirrel")
-}
-
-// TODO: Implement GetPostStats method using Squirrel with JOINs
-func (s *SearchService) GetPostStats(ctx context.Context) (*PostStats, error) {
-	// TODO: Build complex query with JOINs using Squirrel
-	// query := s.psql.Select(
-	//     "COUNT(p.id) as total_posts",
-	//     "COUNT(CASE WHEN p.published = true THEN 1 END) as published_posts",
-	//     "COUNT(DISTINCT p.user_id) as active_users",
-	//     "AVG(LENGTH(p.content)) as avg_content_length",
-	// ).From("posts p").
-	//   Join("users u ON p.user_id = u.id")
-	//
-	// This shows how Squirrel handles complex queries better than string building
-
-	return nil, fmt.Errorf("TODO: implement GetPostStats with Squirrel JOINs")
-}
-
-// PostStats represents aggregated post statistics
-type PostStats struct {
-	TotalPosts       int     `db:"total_posts"`
-	PublishedPosts   int     `db:"published_posts"`
-	ActiveUsers      int     `db:"active_users"`
-	AvgContentLength float64 `db:"avg_content_length"`
-}
-
-// TODO: Implement BuildDynamicQuery helper method
-func (s *SearchService) BuildDynamicQuery(baseQuery squirrel.SelectBuilder, filters SearchFilters) squirrel.SelectBuilder {
-	// TODO: Demonstrate how to build queries step by step with Squirrel
-	//
-	// query := baseQuery
-	//
-	// if filters.Query != "" {
-	//     searchTerm := "%" + filters.Query + "%"
-	//     query = query.Where(squirrel.Or{
-	//         squirrel.ILike{"title": searchTerm},
-	//         squirrel.ILike{"content": searchTerm},
-	//     })
-	// }
-	//
-	// if filters.UserID != nil {
-	//     query = query.Where(squirrel.Eq{"user_id": *filters.UserID})
-	// }
-	//
-	// if filters.Published != nil {
-	//     query = query.Where(squirrel.Eq{"published": *filters.Published})
-	// }
-	//
-	// This modular approach makes dynamic queries much cleaner
-	// than string concatenation used in manual SQL approaches
-
-	return baseQuery
-}
-
-// TODO: Implement GetTopUsers method using Squirrel with complex aggregation
-func (s *SearchService) GetTopUsers(ctx context.Context, limit int) ([]UserWithStats, error) {
-	// TODO: Build complex aggregation query with Squirrel
-	// query := s.psql.Select(
-	//     "u.id",
-	//     "u.name",
-	//     "u.email",
-	//     "COUNT(p.id) as post_count",
-	//     "COUNT(CASE WHEN p.published = true THEN 1 END) as published_count",
-	//     "MAX(p.created_at) as last_post_date",
-	// ).From("users u").
-	//   LeftJoin("posts p ON u.id = p.user_id").
-	//   GroupBy("u.id", "u.name", "u.email").
-	//   OrderBy("post_count DESC").
-	//   Limit(uint64(limit))
-	//
-	// Notice how Squirrel makes complex queries more readable
-	// compared to building SQL strings manually
-
-	return nil, fmt.Errorf("TODO: implement GetTopUsers with Squirrel aggregation")
-}
-
-// UserWithStats represents a user with post statistics
-type UserWithStats struct {
-	models.User
-	PostCount      int    `db:"post_count"`
-	PublishedCount int    `db:"published_count"`
-	LastPostDate   string `db:"last_post_date"`
-}
diff --git a/labs/lab04/backend/repository/search_service_test.go b/labs/lab04/backend/repository/search_service_test.go
deleted file mode 100644
index fd0d0e054..000000000
--- a/labs/lab04/backend/repository/search_service_test.go
+++ /dev/null
@@ -1,155 +0,0 @@
-package repository
-
-import (
-	"testing"
-
-	"lab04-backend/database"
-)
-
-// TestSearchService tests the Squirrel query builder approach
-func TestSearchService(t *testing.T) {
-	// Initialize database for testing
-	db, err := database.InitDB()
-	if err != nil {
-		t.Fatalf("Failed to initialize database: %v", err)
-	}
-	defer database.CloseDB(db)
-
-	// Run migrations
-	if err := database.RunMigrations(db); err != nil {
-		t.Fatalf("Failed to run migrations: %v", err)
-	}
-
-	// Create service instance
-	searchService := NewSearchService(db)
-
-	// TODO: Test SearchPosts with various filters
-	t.Run("SearchPosts with filters", func(t *testing.T) {
-		// TODO: Test dynamic query building with Squirrel
-		// - Test empty filters (should return all posts)
-		// - Test search by query string
-		// - Test filter by user ID
-		// - Test filter by published status
-		// - Test pagination (limit/offset)
-		// - Test sorting (order by different fields)
-		//
-		// Example test structure:
-		// filters := SearchFilters{
-		//     Query: "golang",
-		//     Published: &[]bool{true}[0],
-		//     Limit: 10,
-		//     OrderBy: "created_at",
-		//     OrderDir: "DESC",
-		// }
-		// posts, err := searchService.SearchPosts(context.Background(), filters)
-		// assert.NoError(t, err)
-		// assert.LessOrEqual(t, len(posts), 10)
-
-		// Use searchService to avoid "declared and not used" error
-		_ = searchService
-		t.Skip("TODO: implement SearchPosts test with Squirrel filters")
-	})
-
-	// TODO: Test SearchUsers functionality
-	t.Run("SearchUsers", func(t *testing.T) {
-		// TODO: Test user search with Squirrel
-		// - Test exact name matches
-		// - Test partial name matches with LIKE
-		// - Test case insensitive search
-		// - Test limit functionality
-
-		_ = searchService
-		t.Skip("TODO: implement SearchUsers test with Squirrel")
-	})
-
-	// TODO: Test GetPostStats with complex aggregation
-	t.Run("GetPostStats", func(t *testing.T) {
-		// TODO: Test complex aggregation query
-		// - Insert test data (users and posts)
-		// - Test aggregation calculations
-		// - Verify JOIN functionality
-		// - Test with no data (empty tables)
-
-		_ = searchService
-		t.Skip("TODO: implement GetPostStats test with Squirrel JOINs")
-	})
-
-	// TODO: Test GetTopUsers with aggregation and sorting
-	t.Run("GetTopUsers", func(t *testing.T) {
-		// TODO: Test user ranking with post statistics
-		// - Insert users with different post counts
-		// - Test ordering by post count
-		// - Test LEFT JOIN behavior (users with no posts)
-		// - Test limit functionality
-
-		_ = searchService
-		t.Skip("TODO: implement GetTopUsers test with Squirrel aggregation")
-	})
-
-	// TODO: Test BuildDynamicQuery helper
-	t.Run("BuildDynamicQuery", func(t *testing.T) {
-		// TODO: Test query building step by step
-		// - Test with different filter combinations
-		// - Verify generated SQL syntax
-		// - Test parameter binding
-		//
-		// Example:
-		// baseQuery := searchService.psql.Select("*").From("posts")
-		// filters := SearchFilters{Query: "test", Published: &[]bool{true}[0]}
-		// query := searchService.BuildDynamicQuery(baseQuery, filters)
-		// sql, args, err := query.ToSql()
-		// assert.NoError(t, err)
-		// assert.Contains(t, sql, "WHERE")
-		// assert.Contains(t, sql, "published")
-
-		_ = searchService
-		t.Skip("TODO: implement BuildDynamicQuery test")
-	})
-}
-
-// TestSquirrelQueryBuilder tests Squirrel query building functionality
-func TestSquirrelQueryBuilder(t *testing.T) {
-	// TODO: Test Squirrel query builder patterns
-	t.Run("Basic Query Building", func(t *testing.T) {
-		// TODO: Test basic Squirrel functionality
-		// - Test SELECT with WHERE conditions
-		// - Test dynamic WHERE building
-		// - Test ORDER BY, LIMIT, OFFSET
-		// - Test parameter placeholder generation
-		//
-		// Example:
-		// psql := squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar)
-		// query := psql.Select("id", "name").From("users").Where(squirrel.Eq{"active": true})
-		// sql, args, err := query.ToSql()
-		// assert.NoError(t, err)
-		// assert.Equal(t, "SELECT id, name FROM users WHERE active = $1", sql)
-		// assert.Equal(t, []interface{}{true}, args)
-
-		t.Skip("TODO: implement basic Squirrel query building tests")
-	})
-
-	t.Run("Complex Query Building", func(t *testing.T) {
-		// TODO: Test complex Squirrel features
-		// - Test JOINs
-		// - Test subqueries
-		// - Test complex WHERE conditions (OR, AND, IN)
-		// - Test aggregation functions
-		// - Test GROUP BY and HAVING
-
-		t.Skip("TODO: implement complex Squirrel query tests")
-	})
-}
-
-// BenchmarkSquirrelVsManualSQL benchmarks Squirrel vs manual SQL building
-func BenchmarkSquirrelVsManualSQL(b *testing.B) {
-	// TODO: Compare performance of Squirrel vs manual string building
-	b.Run("Squirrel", func(b *testing.B) {
-		// TODO: Benchmark Squirrel query building
-		b.Skip("TODO: implement Squirrel benchmark")
-	})
-
-	b.Run("Manual SQL", func(b *testing.B) {
-		// TODO: Benchmark manual string building
-		b.Skip("TODO: implement manual SQL benchmark")
-	})
-}
diff --git a/labs/lab04/backend/repository/user_repository.go b/labs/lab04/backend/repository/user_repository.go
deleted file mode 100644
index 28103fee6..000000000
--- a/labs/lab04/backend/repository/user_repository.go
+++ /dev/null
@@ -1,82 +0,0 @@
-package repository
-
-import (
-	"database/sql"
-	"fmt"
-
-	"lab04-backend/models"
-)
-
-// UserRepository handles database operations for users
-// This repository demonstrates MANUAL SQL approach with database/sql package
-type UserRepository struct {
-	db *sql.DB
-}
-
-// NewUserRepository creates a new UserRepository
-func NewUserRepository(db *sql.DB) *UserRepository {
-	return &UserRepository{db: db}
-}
-
-// TODO: Implement Create method
-func (r *UserRepository) Create(req *models.CreateUserRequest) (*models.User, error) {
-	// TODO: Create a new user in the database
-	// - Validate the request
-	// - Insert into users table
-	// - Return the created user with ID and timestamps
-	// Use RETURNING clause to get the generated ID and timestamps
-	return nil, fmt.Errorf("TODO: implement Create method")
-}
-
-// TODO: Implement GetByID method
-func (r *UserRepository) GetByID(id int) (*models.User, error) {
-	// TODO: Get user by ID from database
-	// - Query users table by ID
-	// - Return user or sql.ErrNoRows if not found
-	// - Handle scanning properly
-	return nil, fmt.Errorf("TODO: implement GetByID method")
-}
-
-// TODO: Implement GetByEmail method
-func (r *UserRepository) GetByEmail(email string) (*models.User, error) {
-	// TODO: Get user by email from database
-	// - Query users table by email
-	// - Return user or sql.ErrNoRows if not found
-	// - Handle scanning properly
-	return nil, fmt.Errorf("TODO: implement GetByEmail method")
-}
-
-// TODO: Implement GetAll method
-func (r *UserRepository) GetAll() ([]models.User, error) {
-	// TODO: Get all users from database
-	// - Query all users ordered by created_at
-	// - Return slice of users
-	// - Handle empty result properly
-	return nil, fmt.Errorf("TODO: implement GetAll method")
-}
-
-// TODO: Implement Update method
-func (r *UserRepository) Update(id int, req *models.UpdateUserRequest) (*models.User, error) {
-	// TODO: Update user in database
-	// - Build dynamic UPDATE query based on non-nil fields in req
-	// - Update updated_at timestamp
-	// - Return updated user
-	// - Handle case where user doesn't exist
-	return nil, fmt.Errorf("TODO: implement Update method")
-}
-
-// TODO: Implement Delete method
-func (r *UserRepository) Delete(id int) error {
-	// TODO: Delete user from database
-	// - Delete from users table by ID
-	// - Return error if user doesn't exist
-	// - Consider cascading deletes for posts
-	return fmt.Errorf("TODO: implement Delete method")
-}
-
-// TODO: Implement Count method
-func (r *UserRepository) Count() (int, error) {
-	// TODO: Count total number of users
-	// - Return count of users in database
-	return 0, fmt.Errorf("TODO: implement Count method")
-}
diff --git a/labs/lab04/backend/repository/user_repository_test.go b/labs/lab04/backend/repository/user_repository_test.go
deleted file mode 100644
index 2b84beb07..000000000
--- a/labs/lab04/backend/repository/user_repository_test.go
+++ /dev/null
@@ -1,322 +0,0 @@
-package repository
-
-import (
-	"os"
-	"testing"
-
-	"lab04-backend/database"
-	"lab04-backend/models"
-)
-
-func setupTestDB(t *testing.T) (*UserRepository, func()) {
-	// Create test database
-	testDB := "./test_user_repo.db"
-	config := &database.Config{
-		DatabasePath:    testDB,
-		MaxOpenConns:    5,
-		MaxIdleConns:    1,
-		ConnMaxLifetime: 0,
-		ConnMaxIdleTime: 0,
-	}
-
-	db, err := database.InitDBWithConfig(config)
-	if err != nil {
-		t.Fatalf("Failed to initialize test database: %v", err)
-	}
-
-	err = database.RunMigrations(db)
-	if err != nil {
-		t.Fatalf("Failed to migrate test database: %v", err)
-	}
-
-	repo := NewUserRepository(db)
-
-	// Return cleanup function
-	cleanup := func() {
-		database.CloseDB(db)
-		os.Remove(testDB)
-	}
-
-	return repo, cleanup
-}
-
-func TestUserRepository_Create(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	req := &models.CreateUserRequest{
-		Name:  "John Doe",
-		Email: "john@example.com",
-	}
-
-	user, err := repo.Create(req)
-	if err != nil {
-		t.Fatalf("Create() failed: %v", err)
-	}
-
-	if user == nil {
-		t.Fatal("Create() returned nil user")
-	}
-
-	if user.ID == 0 {
-		t.Error("Create() should set user ID")
-	}
-
-	if user.Name != req.Name {
-		t.Errorf("Create() name = %v, want %v", user.Name, req.Name)
-	}
-
-	if user.Email != req.Email {
-		t.Errorf("Create() email = %v, want %v", user.Email, req.Email)
-	}
-
-	if user.CreatedAt.IsZero() {
-		t.Error("Create() should set CreatedAt")
-	}
-
-	if user.UpdatedAt.IsZero() {
-		t.Error("Create() should set UpdatedAt")
-	}
-}
-
-func TestUserRepository_GetByID(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Create a user first
-	req := &models.CreateUserRequest{
-		Name:  "Jane Doe",
-		Email: "jane@example.com",
-	}
-
-	createdUser, err := repo.Create(req)
-	if err != nil {
-		t.Fatalf("Failed to create user: %v", err)
-	}
-
-	// Test GetByID
-	foundUser, err := repo.GetByID(createdUser.ID)
-	if err != nil {
-		t.Fatalf("GetByID() failed: %v", err)
-	}
-
-	if foundUser == nil {
-		t.Fatal("GetByID() returned nil user")
-	}
-
-	if foundUser.ID != createdUser.ID {
-		t.Errorf("GetByID() ID = %v, want %v", foundUser.ID, createdUser.ID)
-	}
-
-	if foundUser.Name != createdUser.Name {
-		t.Errorf("GetByID() name = %v, want %v", foundUser.Name, createdUser.Name)
-	}
-
-	if foundUser.Email != createdUser.Email {
-		t.Errorf("GetByID() email = %v, want %v", foundUser.Email, createdUser.Email)
-	}
-
-	// Test GetByID with non-existent ID
-	_, err = repo.GetByID(99999)
-	if err == nil {
-		t.Error("GetByID() should return error for non-existent user")
-	}
-}
-
-func TestUserRepository_GetByEmail(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Create a user first
-	req := &models.CreateUserRequest{
-		Name:  "Bob Smith",
-		Email: "bob@example.com",
-	}
-
-	createdUser, err := repo.Create(req)
-	if err != nil {
-		t.Fatalf("Failed to create user: %v", err)
-	}
-
-	// Test GetByEmail
-	foundUser, err := repo.GetByEmail(createdUser.Email)
-	if err != nil {
-		t.Fatalf("GetByEmail() failed: %v", err)
-	}
-
-	if foundUser == nil {
-		t.Fatal("GetByEmail() returned nil user")
-	}
-
-	if foundUser.Email != createdUser.Email {
-		t.Errorf("GetByEmail() email = %v, want %v", foundUser.Email, createdUser.Email)
-	}
-
-	// Test GetByEmail with non-existent email
-	_, err = repo.GetByEmail("nonexistent@example.com")
-	if err == nil {
-		t.Error("GetByEmail() should return error for non-existent email")
-	}
-}
-
-func TestUserRepository_GetAll(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Test empty database
-	users, err := repo.GetAll()
-	if err != nil {
-		t.Fatalf("GetAll() failed: %v", err)
-	}
-
-	if len(users) != 0 {
-		t.Errorf("GetAll() should return empty slice for empty database, got %d users", len(users))
-	}
-
-	// Create multiple users
-	userRequests := []*models.CreateUserRequest{
-		{Name: "User One", Email: "user1@example.com"},
-		{Name: "User Two", Email: "user2@example.com"},
-		{Name: "User Three", Email: "user3@example.com"},
-	}
-
-	for _, req := range userRequests {
-		_, err := repo.Create(req)
-		if err != nil {
-			t.Fatalf("Failed to create user: %v", err)
-		}
-	}
-
-	// Test GetAll with users
-	users, err = repo.GetAll()
-	if err != nil {
-		t.Fatalf("GetAll() failed: %v", err)
-	}
-
-	if len(users) != len(userRequests) {
-		t.Errorf("GetAll() returned %d users, want %d", len(users), len(userRequests))
-	}
-}
-
-func TestUserRepository_Update(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Create a user first
-	req := &models.CreateUserRequest{
-		Name:  "Original Name",
-		Email: "original@example.com",
-	}
-
-	createdUser, err := repo.Create(req)
-	if err != nil {
-		t.Fatalf("Failed to create user: %v", err)
-	}
-
-	// Test update
-	newName := "Updated Name"
-	newEmail := "updated@example.com"
-	updateReq := &models.UpdateUserRequest{
-		Name:  &newName,
-		Email: &newEmail,
-	}
-
-	updatedUser, err := repo.Update(createdUser.ID, updateReq)
-	if err != nil {
-		t.Fatalf("Update() failed: %v", err)
-	}
-
-	if updatedUser == nil {
-		t.Fatal("Update() returned nil user")
-	}
-
-	if updatedUser.Name != newName {
-		t.Errorf("Update() name = %v, want %v", updatedUser.Name, newName)
-	}
-
-	if updatedUser.Email != newEmail {
-		t.Errorf("Update() email = %v, want %v", updatedUser.Email, newEmail)
-	}
-
-	if !updatedUser.UpdatedAt.After(createdUser.UpdatedAt) {
-		t.Error("Update() should update UpdatedAt timestamp")
-	}
-
-	// Test update with non-existent ID
-	_, err = repo.Update(99999, updateReq)
-	if err == nil {
-		t.Error("Update() should return error for non-existent user")
-	}
-}
-
-func TestUserRepository_Delete(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Create a user first
-	req := &models.CreateUserRequest{
-		Name:  "To Be Deleted",
-		Email: "delete@example.com",
-	}
-
-	createdUser, err := repo.Create(req)
-	if err != nil {
-		t.Fatalf("Failed to create user: %v", err)
-	}
-
-	// Test delete
-	err = repo.Delete(createdUser.ID)
-	if err != nil {
-		t.Fatalf("Delete() failed: %v", err)
-	}
-
-	// Verify user is deleted
-	_, err = repo.GetByID(createdUser.ID)
-	if err == nil {
-		t.Error("User should be deleted and GetByID should return error")
-	}
-
-	// Test delete with non-existent ID
-	err = repo.Delete(99999)
-	if err == nil {
-		t.Error("Delete() should return error for non-existent user")
-	}
-}
-
-func TestUserRepository_Count(t *testing.T) {
-	repo, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	// Test count with empty database
-	count, err := repo.Count()
-	if err != nil {
-		t.Fatalf("Count() failed: %v", err)
-	}
-
-	if count != 0 {
-		t.Errorf("Count() should return 0 for empty database, got %d", count)
-	}
-
-	// Create users
-	userRequests := []*models.CreateUserRequest{
-		{Name: "Count User 1", Email: "count1@example.com"},
-		{Name: "Count User 2", Email: "count2@example.com"},
-	}
-
-	for _, req := range userRequests {
-		_, err := repo.Create(req)
-		if err != nil {
-			t.Fatalf("Failed to create user: %v", err)
-		}
-	}
-
-	// Test count with users
-	count, err = repo.Count()
-	if err != nil {
-		t.Fatalf("Count() failed: %v", err)
-	}
-
-	if count != len(userRequests) {
-		t.Errorf("Count() returned %d, want %d", count, len(userRequests))
-	}
-}
diff --git a/labs/lab04/frontend/.gitignore b/labs/lab04/frontend/.gitignore
deleted file mode 100644
index 79c113f9b..000000000
--- a/labs/lab04/frontend/.gitignore
+++ /dev/null
@@ -1,45 +0,0 @@
-# Miscellaneous
-*.class
-*.log
-*.pyc
-*.swp
-.DS_Store
-.atom/
-.build/
-.buildlog/
-.history
-.svn/
-.swiftpm/
-migrate_working_dir/
-
-# IntelliJ related
-*.iml
-*.ipr
-*.iws
-.idea/
-
-# The .vscode folder contains launch configuration and tasks you configure in
-# VS Code which you may wish to be included in version control, so this line
-# is commented out by default.
-#.vscode/
-
-# Flutter/Dart/Pub related
-**/doc/api/
-**/ios/Flutter/.last_build_id
-.dart_tool/
-.flutter-plugins
-.flutter-plugins-dependencies
-.pub-cache/
-.pub/
-/build/
-
-# Symbolication related
-app.*.symbols
-
-# Obfuscation related
-app.*.map.json
-
-# Android Studio will place build artifacts here
-/android/app/debug
-/android/app/profile
-/android/app/release
diff --git a/labs/lab04/frontend/.metadata b/labs/lab04/frontend/.metadata
deleted file mode 100644
index 603c64122..000000000
--- a/labs/lab04/frontend/.metadata
+++ /dev/null
@@ -1,45 +0,0 @@
-# This file tracks properties of this Flutter project.
-# Used by Flutter tool to assess capabilities and perform upgrades etc.
-#
-# This file should be version controlled and should not be manually edited.
-
-version:
-  revision: "6fba2447e95c451518584c35e25f5433f14d888c"
-  channel: "stable"
-
-project_type: app
-
-# Tracks metadata for the flutter migrate command
-migration:
-  platforms:
-    - platform: root
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: android
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: ios
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: linux
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: macos
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: web
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-    - platform: windows
-      create_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-      base_revision: 6fba2447e95c451518584c35e25f5433f14d888c
-
-  # User provided section
-
-  # List of Local paths (relative to this file) that should be
-  # ignored by the migrate tool.
-  #
-  # Files that are not part of the templates will be ignored by default.
-  unmanaged_files:
-    - 'lib/main.dart'
-    - 'ios/Runner.xcodeproj/project.pbxproj'
diff --git a/labs/lab04/frontend/README.md b/labs/lab04/frontend/README.md
deleted file mode 100644
index 03d619cfa..000000000
--- a/labs/lab04/frontend/README.md
+++ /dev/null
@@ -1,16 +0,0 @@
-# frontend
-
-A new Flutter project.
-
-## Getting Started
-
-This project is a starting point for a Flutter application.
-
-A few resources to get you started if this is your first Flutter project:
-
-- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
-
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
diff --git a/labs/lab04/frontend/analysis_options.yaml b/labs/lab04/frontend/analysis_options.yaml
deleted file mode 100644
index 0d2902135..000000000
--- a/labs/lab04/frontend/analysis_options.yaml
+++ /dev/null
@@ -1,28 +0,0 @@
-# This file configures the analyzer, which statically analyzes Dart code to
-# check for errors, warnings, and lints.
-#
-# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
-# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
-# invoked from the command line by running `flutter analyze`.
-
-# The following line activates a set of recommended lints for Flutter apps,
-# packages, and plugins designed to encourage good coding practices.
-include: package:flutter_lints/flutter.yaml
-
-linter:
-  # The lint rules applied to this project can be customized in the
-  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
-  # included above or to enable additional rules. A list of all available lints
-  # and their documentation is published at https://dart.dev/lints.
-  #
-  # Instead of disabling a lint rule for the entire project in the
-  # section below, it can also be suppressed for a single line of code
-  # or a specific dart file by using the `// ignore: name_of_lint` and
-  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
-  # producing the lint.
-  rules:
-    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
-    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
-
-# Additional information about this file can be found at
-# https://dart.dev/guides/language/analysis-options
diff --git a/labs/lab04/frontend/lib/main.dart b/labs/lab04/frontend/lib/main.dart
deleted file mode 100644
index e107715f1..000000000
--- a/labs/lab04/frontend/lib/main.dart
+++ /dev/null
@@ -1,37 +0,0 @@
-import 'package:flutter/material.dart';
-import 'services/preferences_service.dart';
-import 'screens/home_screen.dart';
-
-void main() async {
-  WidgetsFlutterBinding.ensureInitialized();
-
-  // TODO: Initialize services
-  try {
-    // TODO: Initialize PreferencesService
-    await PreferencesService.init();
-
-    // TODO: Add any other service initialization here
-    // For example: await DatabaseService.database;
-  } catch (e) {
-    print('Error initializing services: $e');
-  }
-
-  runApp(const MyApp());
-}
-
-class MyApp extends StatelessWidget {
-  const MyApp({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Lab 04 - Database & Persistence',
-      theme: ThemeData(
-        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
-        useMaterial3: true,
-      ),
-      home: const HomeScreen(),
-      debugShowCheckedModeBanner: false,
-    );
-  }
-}
diff --git a/labs/lab04/frontend/lib/models/user.dart b/labs/lab04/frontend/lib/models/user.dart
deleted file mode 100644
index 1b2dc9a5e..000000000
--- a/labs/lab04/frontend/lib/models/user.dart
+++ /dev/null
@@ -1,83 +0,0 @@
-import 'package:json_annotation/json_annotation.dart';
-
-part 'user.g.dart';
-
-@JsonSerializable()
-class User {
-  final int id;
-  final String name;
-  final String email;
-  @JsonKey(name: 'created_at')
-  final DateTime createdAt;
-  @JsonKey(name: 'updated_at')
-  final DateTime updatedAt;
-
-  User({
-    required this.id,
-    required this.name,
-    required this.email,
-    required this.createdAt,
-    required this.updatedAt,
-  });
-
-  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
-  Map<String, dynamic> toJson() => _$UserToJson(this);
-
-  // TODO: Implement copyWith method
-  User copyWith({
-    int? id,
-    String? name,
-    String? email,
-    DateTime? createdAt,
-    DateTime? updatedAt,
-  }) {
-    // TODO: Create a copy of User with updated fields
-    // Return new User instance with updated values or original values if null
-    throw UnimplementedError('TODO: implement copyWith method');
-  }
-
-  // TODO: Implement equality operator
-  @override
-  bool operator ==(Object other) {
-    // TODO: Compare User objects for equality
-    // Check if other is User and all fields are equal
-    return super == other;
-  }
-
-  // TODO: Implement hashCode
-  @override
-  int get hashCode {
-    // TODO: Generate hash code based on all fields
-    return super.hashCode;
-  }
-
-  // TODO: Implement toString
-  @override
-  String toString() {
-    // TODO: Return string representation of User
-    return super.toString();
-  }
-}
-
-@JsonSerializable()
-class CreateUserRequest {
-  final String name;
-  final String email;
-
-  CreateUserRequest({
-    required this.name,
-    required this.email,
-  });
-
-  factory CreateUserRequest.fromJson(Map<String, dynamic> json) =>
-      _$CreateUserRequestFromJson(json);
-  Map<String, dynamic> toJson() => _$CreateUserRequestToJson(this);
-
-  // TODO: Implement validate method
-  bool validate() {
-    // TODO: Validate user creation request
-    // - Name should not be empty and should be at least 2 characters
-    // - Email should be valid format
-    return false;
-  }
-}
diff --git a/labs/lab04/frontend/lib/models/user.g.dart b/labs/lab04/frontend/lib/models/user.g.dart
deleted file mode 100644
index 2bdcd526d..000000000
--- a/labs/lab04/frontend/lib/models/user.g.dart
+++ /dev/null
@@ -1,35 +0,0 @@
-// GENERATED CODE - DO NOT MODIFY BY HAND
-
-part of 'user.dart';
-
-// **************************************************************************
-// JsonSerializableGenerator
-// **************************************************************************
-
-User _$UserFromJson(Map<String, dynamic> json) => User(
-      id: (json['id'] as num).toInt(),
-      name: json['name'] as String,
-      email: json['email'] as String,
-      createdAt: DateTime.parse(json['created_at'] as String),
-      updatedAt: DateTime.parse(json['updated_at'] as String),
-    );
-
-Map<String, dynamic> _$UserToJson(User instance) => <String, dynamic>{
-      'id': instance.id,
-      'name': instance.name,
-      'email': instance.email,
-      'created_at': instance.createdAt.toIso8601String(),
-      'updated_at': instance.updatedAt.toIso8601String(),
-    };
-
-CreateUserRequest _$CreateUserRequestFromJson(Map<String, dynamic> json) =>
-    CreateUserRequest(
-      name: json['name'] as String,
-      email: json['email'] as String,
-    );
-
-Map<String, dynamic> _$CreateUserRequestToJson(CreateUserRequest instance) =>
-    <String, dynamic>{
-      'name': instance.name,
-      'email': instance.email,
-    };
diff --git a/labs/lab04/frontend/lib/screens/home_screen.dart b/labs/lab04/frontend/lib/screens/home_screen.dart
deleted file mode 100644
index 92840499a..000000000
--- a/labs/lab04/frontend/lib/screens/home_screen.dart
+++ /dev/null
@@ -1,209 +0,0 @@
-import 'package:flutter/material.dart';
-import '../services/preferences_service.dart';
-import '../services/database_service.dart';
-import '../services/secure_storage_service.dart';
-
-class HomeScreen extends StatefulWidget {
-  const HomeScreen({super.key});
-
-  @override
-  State<HomeScreen> createState() => _HomeScreenState();
-}
-
-class _HomeScreenState extends State<HomeScreen> {
-  String _statusMessage = 'Welcome to Lab 04 - Database & Persistence';
-  bool _isLoading = false;
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Lab 04 - Database & Persistence'),
-        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-      ),
-      body: Padding(
-        padding: const EdgeInsets.all(16.0),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            Card(
-              child: Padding(
-                padding: const EdgeInsets.all(16.0),
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    const Text(
-                      'Status',
-                      style:
-                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
-                    ),
-                    const SizedBox(height: 8),
-                    Text(_statusMessage),
-                    if (_isLoading)
-                      const Padding(
-                        padding: EdgeInsets.only(top: 8),
-                        child: LinearProgressIndicator(),
-                      ),
-                  ],
-                ),
-              ),
-            ),
-            const SizedBox(height: 20),
-            const Text(
-              'Storage Options',
-              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
-            ),
-            const SizedBox(height: 16),
-
-            // SharedPreferences Section
-            _buildStorageSection(
-              'SharedPreferences',
-              'Simple key-value storage for app settings',
-              [
-                ElevatedButton(
-                  onPressed: _testSharedPreferences,
-                  child: const Text('Test SharedPreferences'),
-                ),
-              ],
-            ),
-
-            // SQLite Section
-            _buildStorageSection(
-              'SQLite Database',
-              'Local SQL database for structured data',
-              [
-                ElevatedButton(
-                  onPressed: _testSQLite,
-                  child: const Text('Test SQLite'),
-                ),
-              ],
-            ),
-
-            // Secure Storage Section
-            _buildStorageSection(
-              'Secure Storage',
-              'Encrypted storage for sensitive data',
-              [
-                ElevatedButton(
-                  onPressed: _testSecureStorage,
-                  child: const Text('Test Secure Storage'),
-                ),
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildStorageSection(
-      String title, String description, List<Widget> buttons) {
-    return Card(
-      margin: const EdgeInsets.only(bottom: 12),
-      child: Padding(
-        padding: const EdgeInsets.all(16.0),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              title,
-              style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
-            ),
-            const SizedBox(height: 4),
-            Text(
-              description,
-              style: const TextStyle(color: Colors.grey),
-            ),
-            const SizedBox(height: 12),
-            Wrap(
-              spacing: 8,
-              children: buttons,
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Future<void> _testSharedPreferences() async {
-    setState(() {
-      _isLoading = true;
-      _statusMessage = 'Testing SharedPreferences...';
-    });
-
-    try {
-      // TODO: Implement SharedPreferences test
-      // This will test when students implement the methods
-
-      await PreferencesService.setString(
-          'test_key', 'Hello from SharedPreferences!');
-      final value = PreferencesService.getString('test_key');
-
-      setState(() {
-        _statusMessage = 'SharedPreferences test result: $value';
-      });
-    } catch (e) {
-      setState(() {
-        _statusMessage = 'SharedPreferences test failed: $e';
-      });
-    } finally {
-      setState(() {
-        _isLoading = false;
-      });
-    }
-  }
-
-  Future<void> _testSQLite() async {
-    setState(() {
-      _isLoading = true;
-      _statusMessage = 'Testing SQLite database...';
-    });
-
-    try {
-      // TODO: Implement SQLite test
-      // This will test when students implement the methods
-
-      final userCount = await DatabaseService.getUserCount();
-
-      setState(() {
-        _statusMessage =
-            'SQLite test result: Found $userCount users in database';
-      });
-    } catch (e) {
-      setState(() {
-        _statusMessage = 'SQLite test failed: $e';
-      });
-    } finally {
-      setState(() {
-        _isLoading = false;
-      });
-    }
-  }
-
-  Future<void> _testSecureStorage() async {
-    setState(() {
-      _isLoading = true;
-      _statusMessage = 'Testing Secure Storage...';
-    });
-
-    try {
-      // TODO: Implement Secure Storage test
-      // This will test when students implement the methods
-
-      await SecureStorageService.saveSecureData('test_secure', 'Secret data');
-      final value = await SecureStorageService.getSecureData('test_secure');
-
-      setState(() {
-        _statusMessage = 'Secure Storage test result: $value';
-      });
-    } catch (e) {
-      setState(() {
-        _statusMessage = 'Secure Storage test failed: $e';
-      });
-    } finally {
-      setState(() {
-        _isLoading = false;
-      });
-    }
-  }
-}
diff --git a/labs/lab04/frontend/lib/services/database_service.dart b/labs/lab04/frontend/lib/services/database_service.dart
deleted file mode 100644
index 62cc703e0..000000000
--- a/labs/lab04/frontend/lib/services/database_service.dart
+++ /dev/null
@@ -1,125 +0,0 @@
-import 'package:sqflite/sqflite.dart';
-import 'package:path/path.dart';
-import '../models/user.dart';
-
-class DatabaseService {
-  static Database? _database;
-  static const String _dbName = 'lab04_app.db';
-  static const int _version = 1;
-
-  // TODO: Implement database getter
-  static Future<Database> get database async {
-    // TODO: Return existing database or initialize new one
-    // Use the null-aware operator to check if _database exists
-    throw UnimplementedError('TODO: implement database getter');
-  }
-
-  // TODO: Implement _initDatabase method
-  static Future<Database> _initDatabase() async {
-    // TODO: Initialize the SQLite database
-    // - Get the databases path
-    // - Join with database name
-    // - Open database with version and callbacks
-    throw UnimplementedError('TODO: implement _initDatabase method');
-  }
-
-  // TODO: Implement _onCreate method
-  static Future<void> _onCreate(Database db, int version) async {
-    // TODO: Create tables when database is first created
-    // Create users table with: id, name, email, created_at, updated_at
-    // Create posts table with: id, user_id, title, content, published, created_at, updated_at
-    // Include proper PRIMARY KEY and FOREIGN KEY constraints
-    throw UnimplementedError('TODO: implement _onCreate method');
-  }
-
-  // TODO: Implement _onUpgrade method
-  static Future<void> _onUpgrade(
-      Database db, int oldVersion, int newVersion) async {
-    // TODO: Handle database schema upgrades
-    // For now, you can leave this empty or add migration logic later
-  }
-
-  // User CRUD operations
-
-  // TODO: Implement createUser method
-  static Future<User> createUser(CreateUserRequest request) async {
-    // TODO: Insert user into database
-    // - Get database instance
-    // - Insert user data
-    // - Return User object with generated ID and timestamps
-    throw UnimplementedError('TODO: implement createUser method');
-  }
-
-  // TODO: Implement getUser method
-  static Future<User?> getUser(int id) async {
-    // TODO: Get user by ID from database
-    // - Query users table by ID
-    // - Return User object or null if not found
-    throw UnimplementedError('TODO: implement getUser method');
-  }
-
-  // TODO: Implement getAllUsers method
-  static Future<List<User>> getAllUsers() async {
-    // TODO: Get all users from database
-    // - Query all users ordered by created_at
-    // - Convert query results to User objects
-    throw UnimplementedError('TODO: implement getAllUsers method');
-  }
-
-  // TODO: Implement updateUser method
-  static Future<User> updateUser(int id, Map<String, dynamic> updates) async {
-    // TODO: Update user in database
-    // - Update user with provided data
-    // - Update the updated_at timestamp
-    // - Return updated User object
-    throw UnimplementedError('TODO: implement updateUser method');
-  }
-
-  // TODO: Implement deleteUser method
-  static Future<void> deleteUser(int id) async {
-    // TODO: Delete user from database
-    // - Delete user by ID
-    // - Consider cascading deletes for related data
-    throw UnimplementedError('TODO: implement deleteUser method');
-  }
-
-  // TODO: Implement getUserCount method
-  static Future<int> getUserCount() async {
-    // TODO: Count total number of users
-    // - Query count from users table
-    throw UnimplementedError('TODO: implement getUserCount method');
-  }
-
-  // TODO: Implement searchUsers method
-  static Future<List<User>> searchUsers(String query) async {
-    // TODO: Search users by name or email
-    // - Use LIKE operator for pattern matching
-    // - Search in both name and email fields
-    throw UnimplementedError('TODO: implement searchUsers method');
-  }
-
-  // Database utility methods
-
-  // TODO: Implement closeDatabase method
-  static Future<void> closeDatabase() async {
-    // TODO: Close database connection
-    // - Close the database if it exists
-    // - Set _database to null
-    throw UnimplementedError('TODO: implement closeDatabase method');
-  }
-
-  // TODO: Implement clearAllData method
-  static Future<void> clearAllData() async {
-    // TODO: Clear all data from database (for testing)
-    // - Delete all records from all tables
-    // - Reset auto-increment counters if needed
-    throw UnimplementedError('TODO: implement clearAllData method');
-  }
-
-  // TODO: Implement getDatabasePath method
-  static Future<String> getDatabasePath() async {
-    // TODO: Get the full path to the database file
-    // - Return the complete path to the database file
-    throw UnimplementedError('TODO: implement getDatabasePath method');
-  }
-}
diff --git a/labs/lab04/frontend/lib/services/preferences_service.dart b/labs/lab04/frontend/lib/services/preferences_service.dart
deleted file mode 100644
index 616276c27..000000000
--- a/labs/lab04/frontend/lib/services/preferences_service.dart
+++ /dev/null
@@ -1,101 +0,0 @@
-import 'package:shared_preferences/shared_preferences.dart';
-import 'dart:convert';
-
-class PreferencesService {
-  static SharedPreferences? _prefs;
-
-  // TODO: Implement init method
-  static Future<void> init() async {
-    // TODO: Initialize SharedPreferences
-    // Store the instance in _prefs variable
-    throw UnimplementedError('TODO: implement init method');
-  }
-
-  // TODO: Implement setString method
-  static Future<void> setString(String key, String value) async {
-    // TODO: Set string value in SharedPreferences
-    // Make sure _prefs is not null
-    throw UnimplementedError('TODO: implement setString method');
-  }
-
-  // TODO: Implement getString method
-  static String? getString(String key) {
-    // TODO: Get string value from SharedPreferences
-    // Return null if key doesn't exist
-    throw UnimplementedError('TODO: implement getString method');
-  }
-
-  // TODO: Implement setInt method
-  static Future<void> setInt(String key, int value) async {
-    // TODO: Set int value in SharedPreferences
-    throw UnimplementedError('TODO: implement setInt method');
-  }
-
-  // TODO: Implement getInt method
-  static int? getInt(String key) {
-    // TODO: Get int value from SharedPreferences
-    throw UnimplementedError('TODO: implement getInt method');
-  }
-
-  // TODO: Implement setBool method
-  static Future<void> setBool(String key, bool value) async {
-    // TODO: Set bool value in SharedPreferences
-    throw UnimplementedError('TODO: implement setBool method');
-  }
-
-  // TODO: Implement getBool method
-  static bool? getBool(String key) {
-    // TODO: Get bool value from SharedPreferences
-    throw UnimplementedError('TODO: implement getBool method');
-  }
-
-  // TODO: Implement setStringList method
-  static Future<void> setStringList(String key, List<String> value) async {
-    // TODO: Set string list in SharedPreferences
-    throw UnimplementedError('TODO: implement setStringList method');
-  }
-
-  // TODO: Implement getStringList method
-  static List<String>? getStringList(String key) {
-    // TODO: Get string list from SharedPreferences
-    throw UnimplementedError('TODO: implement getStringList method');
-  }
-
-  // TODO: Implement setObject method
-  static Future<void> setObject(String key, Map<String, dynamic> value) async {
-    // TODO: Set object (as JSON string) in SharedPreferences
-    // Convert object to JSON string first
-    throw UnimplementedError('TODO: implement setObject method');
-  }
-
-  // TODO: Implement getObject method
-  static Map<String, dynamic>? getObject(String key) {
-    // TODO: Get object from SharedPreferences
-    // Parse JSON string back to Map
-    throw UnimplementedError('TODO: implement getObject method');
-  }
-
-  // TODO: Implement remove method
-  static Future<void> remove(String key) async {
-    // TODO: Remove key from SharedPreferences
-    throw UnimplementedError('TODO: implement remove method');
-  }
-
-  // TODO: Implement clear method
-  static Future<void> clear() async {
-    // TODO: Clear all data from SharedPreferences
-    throw UnimplementedError('TODO: implement clear method');
-  }
-
-  // TODO: Implement containsKey method
-  static bool containsKey(String key) {
-    // TODO: Check if key exists in SharedPreferences
-    throw UnimplementedError('TODO: implement containsKey method');
-  }
-
-  // TODO: Implement getAllKeys method
-  static Set<String> getAllKeys() {
-    // TODO: Get all keys from SharedPreferences
-    throw UnimplementedError('TODO: implement getAllKeys method');
-  }
-}
diff --git a/labs/lab04/frontend/lib/services/secure_storage_service.dart b/labs/lab04/frontend/lib/services/secure_storage_service.dart
deleted file mode 100644
index 5ddb348e5..000000000
--- a/labs/lab04/frontend/lib/services/secure_storage_service.dart
+++ /dev/null
@@ -1,130 +0,0 @@
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
-import 'dart:convert';
-
-class SecureStorageService {
-  static const FlutterSecureStorage _storage = FlutterSecureStorage(
-    aOptions: AndroidOptions(
-      encryptedSharedPreferences: true,
-    ),
-    iOptions: IOSOptions(
-      accessibility: KeychainAccessibility.first_unlock_this_device,
-    ),
-  );
-
-  // TODO: Implement saveAuthToken method
-  static Future<void> saveAuthToken(String token) async {
-    // TODO: Save authentication token securely
-    // Use key 'auth_token'
-    throw UnimplementedError('TODO: implement saveAuthToken method');
-  }
-
-  // TODO: Implement getAuthToken method
-  static Future<String?> getAuthToken() async {
-    // TODO: Get authentication token from secure storage
-    // Return null if not found
-    throw UnimplementedError('TODO: implement getAuthToken method');
-  }
-
-  // TODO: Implement deleteAuthToken method
-  static Future<void> deleteAuthToken() async {
-    // TODO: Delete authentication token from secure storage
-    throw UnimplementedError('TODO: implement deleteAuthToken method');
-  }
-
-  // TODO: Implement saveUserCredentials method
-  static Future<void> saveUserCredentials(
-      String username, String password) async {
-    // TODO: Save user credentials securely
-    // Save username with key 'username' and password with key 'password'
-    throw UnimplementedError('TODO: implement saveUserCredentials method');
-  }
-
-  // TODO: Implement getUserCredentials method
-  static Future<Map<String, String?>> getUserCredentials() async {
-    // TODO: Get user credentials from secure storage
-    // Return map with 'username' and 'password' keys
-    throw UnimplementedError('TODO: implement getUserCredentials method');
-  }
-
-  // TODO: Implement deleteUserCredentials method
-  static Future<void> deleteUserCredentials() async {
-    // TODO: Delete user credentials from secure storage
-    // Delete both username and password
-    throw UnimplementedError('TODO: implement deleteUserCredentials method');
-  }
-
-  // TODO: Implement saveBiometricEnabled method
-  static Future<void> saveBiometricEnabled(bool enabled) async {
-    // TODO: Save biometric setting securely
-    // Convert bool to string for storage
-    throw UnimplementedError('TODO: implement saveBiometricEnabled method');
-  }
-
-  // TODO: Implement isBiometricEnabled method
-  static Future<bool> isBiometricEnabled() async {
-    // TODO: Get biometric setting from secure storage
-    // Return false as default if not found
-    throw UnimplementedError('TODO: implement isBiometricEnabled method');
-  }
-
-  // TODO: Implement saveSecureData method
-  static Future<void> saveSecureData(String key, String value) async {
-    // TODO: Save any secure data with custom key
-    throw UnimplementedError('TODO: implement saveSecureData method');
-  }
-
-  // TODO: Implement getSecureData method
-  static Future<String?> getSecureData(String key) async {
-    // TODO: Get secure data by key
-    throw UnimplementedError('TODO: implement getSecureData method');
-  }
-
-  // TODO: Implement deleteSecureData method
-  static Future<void> deleteSecureData(String key) async {
-    // TODO: Delete secure data by key
-    throw UnimplementedError('TODO: implement deleteSecureData method');
-  }
-
-  // TODO: Implement saveObject method
-  static Future<void> saveObject(
-      String key, Map<String, dynamic> object) async {
-    // TODO: Save object as JSON string in secure storage
-    // Convert object to JSON string first
-    throw UnimplementedError('TODO: implement saveObject method');
-  }
-
-  // TODO: Implement getObject method
-  static Future<Map<String, dynamic>?> getObject(String key) async {
-    // TODO: Get object from secure storage
-    // Parse JSON string back to Map
-    throw UnimplementedError('TODO: implement getObject method');
-  }
-
-  // TODO: Implement containsKey method
-  static Future<bool> containsKey(String key) async {
-    // TODO: Check if key exists in secure storage
-    throw UnimplementedError('TODO: implement containsKey method');
-  }
-
-  // TODO: Implement getAllKeys method
-  static Future<List<String>> getAllKeys() async {
-    // TODO: Get all keys from secure storage
-    // Return list of all stored keys
-    throw UnimplementedError('TODO: implement getAllKeys method');
-  }
-
-  // TODO: Implement clearAll method
-  static Future<void> clearAll() async {
-    // TODO: Clear all data from secure storage
-    // Use deleteAll method from FlutterSecureStorage
-    throw UnimplementedError('TODO: implement clearAll method');
-  }
-
-  // TODO: Implement exportData method
-  static Future<Map<String, String>> exportData() async {
-    // TODO: Export all data (for backup purposes)
-    // Return all key-value pairs
-    // NOTE: This defeats the purpose of secure storage, use carefully
-    throw UnimplementedError('TODO: implement exportData method');
-  }
-}
diff --git a/labs/lab04/frontend/pubspec.lock b/labs/lab04/frontend/pubspec.lock
deleted file mode 100644
index 7cb1e095f..000000000
--- a/labs/lab04/frontend/pubspec.lock
+++ /dev/null
@@ -1,834 +0,0 @@
-# Generated by pub
-# See https://dart.dev/tools/pub/glossary#lockfile
-packages:
-  _fe_analyzer_shared:
-    dependency: transitive
-    description:
-      name: _fe_analyzer_shared
-      sha256: da0d9209ca76bde579f2da330aeb9df62b6319c834fa7baae052021b0462401f
-      url: "https://pub.dev"
-    source: hosted
-    version: "85.0.0"
-  analyzer:
-    dependency: transitive
-    description:
-      name: analyzer
-      sha256: d10f9c2bf877706e39e9cc94d89ba28c7084f6e3529b4a2a96bb474fd0323647
-      url: "https://pub.dev"
-    source: hosted
-    version: "7.5.5"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.7.0"
-  async:
-    dependency: transitive
-    description:
-      name: async
-      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.13.0"
-  boolean_selector:
-    dependency: transitive
-    description:
-      name: boolean_selector
-      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.2"
-  build:
-    dependency: transitive
-    description:
-      name: build
-      sha256: "51dc711996cbf609b90cbe5b335bbce83143875a9d58e4b5c6d3c4f684d3dda7"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.4"
-  build_config:
-    dependency: transitive
-    description:
-      name: build_config
-      sha256: "4ae2de3e1e67ea270081eaee972e1bd8f027d459f249e0f1186730784c2e7e33"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
-  build_daemon:
-    dependency: transitive
-    description:
-      name: build_daemon
-      sha256: "8e928697a82be082206edb0b9c99c5a4ad6bc31c9e9b8b2f291ae65cd4a25daa"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.4"
-  build_resolvers:
-    dependency: transitive
-    description:
-      name: build_resolvers
-      sha256: ee4257b3f20c0c90e72ed2b57ad637f694ccba48839a821e87db762548c22a62
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.4"
-  build_runner:
-    dependency: "direct dev"
-    description:
-      name: build_runner
-      sha256: "382a4d649addbfb7ba71a3631df0ec6a45d5ab9b098638144faf27f02778eb53"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.4"
-  build_runner_core:
-    dependency: transitive
-    description:
-      name: build_runner_core
-      sha256: "85fbbb1036d576d966332a3f5ce83f2ce66a40bea1a94ad2d5fc29a19a0d3792"
-      url: "https://pub.dev"
-    source: hosted
-    version: "9.1.2"
-  built_collection:
-    dependency: transitive
-    description:
-      name: built_collection
-      sha256: "376e3dd27b51ea877c28d525560790aee2e6fbb5f20e2f85d5081027d94e2100"
-      url: "https://pub.dev"
-    source: hosted
-    version: "5.1.1"
-  built_value:
-    dependency: transitive
-    description:
-      name: built_value
-      sha256: "082001b5c3dc495d4a42f1d5789990505df20d8547d42507c29050af6933ee27"
-      url: "https://pub.dev"
-    source: hosted
-    version: "8.10.1"
-  characters:
-    dependency: transitive
-    description:
-      name: characters
-      sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.0"
-  checked_yaml:
-    dependency: transitive
-    description:
-      name: checked_yaml
-      sha256: "959525d3162f249993882720d52b7e0c833978df229be20702b33d48d91de70f"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.4"
-  clock:
-    dependency: transitive
-    description:
-      name: clock
-      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
-  code_builder:
-    dependency: transitive
-    description:
-      name: code_builder
-      sha256: "0ec10bf4a89e4c613960bf1e8b42c64127021740fb21640c29c909826a5eea3e"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.10.1"
-  collection:
-    dependency: transitive
-    description:
-      name: collection
-      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.19.1"
-  convert:
-    dependency: transitive
-    description:
-      name: convert
-      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.2"
-  crypto:
-    dependency: transitive
-    description:
-      name: crypto
-      sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.6"
-  dart_style:
-    dependency: transitive
-    description:
-      name: dart_style
-      sha256: "5b236382b47ee411741447c1f1e111459c941ea1b3f2b540dde54c210a3662af"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.0"
-  fake_async:
-    dependency: transitive
-    description:
-      name: fake_async
-      sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.3.3"
-  ffi:
-    dependency: transitive
-    description:
-      name: ffi
-      sha256: "289279317b4b16eb2bb7e271abccd4bf84ec9bdcbe999e278a94b804f5630418"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.4"
-  file:
-    dependency: transitive
-    description:
-      name: file
-      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
-      url: "https://pub.dev"
-    source: hosted
-    version: "7.0.1"
-  fixnum:
-    dependency: transitive
-    description:
-      name: fixnum
-      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.1"
-  flutter:
-    dependency: "direct main"
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  flutter_lints:
-    dependency: "direct dev"
-    description:
-      name: flutter_lints
-      sha256: "9e8c3858111da373efc5aa341de011d9bd23e2c5c5e0c62bccf32438e192d7b1"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.2"
-  flutter_secure_storage:
-    dependency: "direct main"
-    description:
-      name: flutter_secure_storage
-      sha256: "9cad52d75ebc511adfae3d447d5d13da15a55a92c9410e50f67335b6d21d16ea"
-      url: "https://pub.dev"
-    source: hosted
-    version: "9.2.4"
-  flutter_secure_storage_linux:
-    dependency: transitive
-    description:
-      name: flutter_secure_storage_linux
-      sha256: be76c1d24a97d0b98f8b54bce6b481a380a6590df992d0098f868ad54dc8f688
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.3"
-  flutter_secure_storage_macos:
-    dependency: transitive
-    description:
-      name: flutter_secure_storage_macos
-      sha256: "6c0a2795a2d1de26ae202a0d78527d163f4acbb11cde4c75c670f3a0fc064247"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.3"
-  flutter_secure_storage_platform_interface:
-    dependency: transitive
-    description:
-      name: flutter_secure_storage_platform_interface
-      sha256: cf91ad32ce5adef6fba4d736a542baca9daf3beac4db2d04be350b87f69ac4a8
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
-  flutter_secure_storage_web:
-    dependency: transitive
-    description:
-      name: flutter_secure_storage_web
-      sha256: f4ebff989b4f07b2656fb16b47852c0aab9fed9b4ec1c70103368337bc1886a9
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.1"
-  flutter_secure_storage_windows:
-    dependency: transitive
-    description:
-      name: flutter_secure_storage_windows
-      sha256: b20b07cb5ed4ed74fc567b78a72936203f587eba460af1df11281c9326cd3709
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.2"
-  flutter_test:
-    dependency: "direct dev"
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  flutter_web_plugins:
-    dependency: transitive
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  frontend_server_client:
-    dependency: transitive
-    description:
-      name: frontend_server_client
-      sha256: f64a0333a82f30b0cca061bc3d143813a486dc086b574bfb233b7c1372427694
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.0"
-  glob:
-    dependency: transitive
-    description:
-      name: glob
-      sha256: c3f1ee72c96f8f78935e18aa8cecced9ab132419e8625dc187e1c2408efc20de
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.3"
-  graphs:
-    dependency: transitive
-    description:
-      name: graphs
-      sha256: "741bbf84165310a68ff28fe9e727332eef1407342fca52759cb21ad8177bb8d0"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.3.2"
-  http:
-    dependency: transitive
-    description:
-      name: http
-      sha256: "2c11f3f94c687ee9bad77c171151672986360b2b001d109814ee7140b2cf261b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.0"
-  http_multi_server:
-    dependency: transitive
-    description:
-      name: http_multi_server
-      sha256: aa6199f908078bb1c5efb8d8638d4ae191aac11b311132c3ef48ce352fb52ef8
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.2.2"
-  http_parser:
-    dependency: transitive
-    description:
-      name: http_parser
-      sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.1.2"
-  io:
-    dependency: transitive
-    description:
-      name: io
-      sha256: dfd5a80599cf0165756e3181807ed3e77daf6dd4137caaad72d0b7931597650b
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.5"
-  js:
-    dependency: transitive
-    description:
-      name: js
-      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.6.7"
-  json_annotation:
-    dependency: "direct main"
-    description:
-      name: json_annotation
-      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.9.0"
-  json_serializable:
-    dependency: "direct dev"
-    description:
-      name: json_serializable
-      sha256: c50ef5fc083d5b5e12eef489503ba3bf5ccc899e487d691584699b4bdefeea8c
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.9.5"
-  leak_tracker:
-    dependency: transitive
-    description:
-      name: leak_tracker
-      sha256: "6bb818ecbdffe216e81182c2f0714a2e62b593f4a4f13098713ff1685dfb6ab0"
-      url: "https://pub.dev"
-    source: hosted
-    version: "10.0.9"
-  leak_tracker_flutter_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_flutter_testing
-      sha256: f8b613e7e6a13ec79cfdc0e97638fddb3ab848452eff057653abd3edba760573
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.9"
-  leak_tracker_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_testing
-      sha256: "6ba465d5d76e67ddf503e1161d1f4a6bc42306f9d66ca1e8f079a47290fb06d3"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.1"
-  lints:
-    dependency: transitive
-    description:
-      name: lints
-      sha256: cbf8d4b858bb0134ef3ef87841abdf8d63bfc255c266b7bf6b39daa1085c4290
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.0"
-  logging:
-    dependency: transitive
-    description:
-      name: logging
-      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.3.0"
-  matcher:
-    dependency: transitive
-    description:
-      name: matcher
-      sha256: dc58c723c3c24bf8d3e2d3ad3f2f9d7bd9cf43ec6feaa64181775e60190153f2
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.12.17"
-  material_color_utilities:
-    dependency: transitive
-    description:
-      name: material_color_utilities
-      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.11.1"
-  meta:
-    dependency: transitive
-    description:
-      name: meta
-      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.16.0"
-  mime:
-    dependency: transitive
-    description:
-      name: mime
-      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.0"
-  package_config:
-    dependency: transitive
-    description:
-      name: package_config
-      sha256: f096c55ebb7deb7e384101542bfba8c52696c1b56fca2eb62827989ef2353bbc
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.2.0"
-  path:
-    dependency: "direct main"
-    description:
-      name: path
-      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.9.1"
-  path_provider:
-    dependency: "direct main"
-    description:
-      name: path_provider
-      sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.5"
-  path_provider_android:
-    dependency: transitive
-    description:
-      name: path_provider_android
-      sha256: d0d310befe2c8ab9e7f393288ccbb11b60c019c6b5afc21973eeee4dda2b35e9
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.2.17"
-  path_provider_foundation:
-    dependency: transitive
-    description:
-      name: path_provider_foundation
-      sha256: "4843174df4d288f5e29185bd6e72a6fbdf5a4a4602717eed565497429f179942"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.1"
-  path_provider_linux:
-    dependency: transitive
-    description:
-      name: path_provider_linux
-      sha256: f7a1fe3a634fe7734c8d3f2766ad746ae2a2884abe22e241a8b301bf5cac3279
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.2.1"
-  path_provider_platform_interface:
-    dependency: transitive
-    description:
-      name: path_provider_platform_interface
-      sha256: "88f5779f72ba699763fa3a3b06aa4bf6de76c8e5de842cf6f29e2e06476c2334"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.2"
-  path_provider_windows:
-    dependency: transitive
-    description:
-      name: path_provider_windows
-      sha256: bd6f00dbd873bfb70d0761682da2b3a2c2fccc2b9e84c495821639601d81afe7
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.3.0"
-  platform:
-    dependency: transitive
-    description:
-      name: platform
-      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.6"
-  plugin_platform_interface:
-    dependency: transitive
-    description:
-      name: plugin_platform_interface
-      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.8"
-  pool:
-    dependency: transitive
-    description:
-      name: pool
-      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.5.1"
-  pub_semver:
-    dependency: transitive
-    description:
-      name: pub_semver
-      sha256: "5bfcf68ca79ef689f8990d1160781b4bad40a3bd5e5218ad4076ddb7f4081585"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.2.0"
-  pubspec_parse:
-    dependency: transitive
-    description:
-      name: pubspec_parse
-      sha256: "0560ba233314abbed0a48a2956f7f022cce7c3e1e73df540277da7544cad4082"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.5.0"
-  shared_preferences:
-    dependency: "direct main"
-    description:
-      name: shared_preferences
-      sha256: "6e8bf70b7fef813df4e9a36f658ac46d107db4b4cfe1048b477d4e453a8159f5"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.3"
-  shared_preferences_android:
-    dependency: transitive
-    description:
-      name: shared_preferences_android
-      sha256: "20cbd561f743a342c76c151d6ddb93a9ce6005751e7aa458baad3858bfbfb6ac"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.10"
-  shared_preferences_foundation:
-    dependency: transitive
-    description:
-      name: shared_preferences_foundation
-      sha256: "6a52cfcdaeac77cad8c97b539ff688ccfc458c007b4db12be584fbe5c0e49e03"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.4"
-  shared_preferences_linux:
-    dependency: transitive
-    description:
-      name: shared_preferences_linux
-      sha256: "580abfd40f415611503cae30adf626e6656dfb2f0cee8f465ece7b6defb40f2f"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.1"
-  shared_preferences_platform_interface:
-    dependency: transitive
-    description:
-      name: shared_preferences_platform_interface
-      sha256: "57cbf196c486bc2cf1f02b85784932c6094376284b3ad5779d1b1c6c6a816b80"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.1"
-  shared_preferences_web:
-    dependency: transitive
-    description:
-      name: shared_preferences_web
-      sha256: c49bd060261c9a3f0ff445892695d6212ff603ef3115edbb448509d407600019
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.3"
-  shared_preferences_windows:
-    dependency: transitive
-    description:
-      name: shared_preferences_windows
-      sha256: "94ef0f72b2d71bc3e700e025db3710911bd51a71cefb65cc609dd0d9a982e3c1"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.1"
-  shelf:
-    dependency: transitive
-    description:
-      name: shelf
-      sha256: e7dd780a7ffb623c57850b33f43309312fc863fb6aa3d276a754bb299839ef12
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.2"
-  shelf_web_socket:
-    dependency: transitive
-    description:
-      name: shelf_web_socket
-      sha256: "3632775c8e90d6c9712f883e633716432a27758216dfb61bd86a8321c0580925"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.0"
-  sky_engine:
-    dependency: transitive
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  source_gen:
-    dependency: transitive
-    description:
-      name: source_gen
-      sha256: "35c8150ece9e8c8d263337a265153c3329667640850b9304861faea59fc98f6b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.0"
-  source_helper:
-    dependency: transitive
-    description:
-      name: source_helper
-      sha256: "86d247119aedce8e63f4751bd9626fc9613255935558447569ad42f9f5b48b3c"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.3.5"
-  source_span:
-    dependency: transitive
-    description:
-      name: source_span
-      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.10.1"
-  sqflite:
-    dependency: "direct main"
-    description:
-      name: sqflite
-      sha256: e2297b1da52f127bc7a3da11439985d9b536f75070f3325e62ada69a5c585d03
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.2"
-  sqflite_android:
-    dependency: transitive
-    description:
-      name: sqflite_android
-      sha256: "2b3070c5fa881839f8b402ee4a39c1b4d561704d4ebbbcfb808a119bc2a1701b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.1"
-  sqflite_common:
-    dependency: transitive
-    description:
-      name: sqflite_common
-      sha256: "84731e8bfd8303a3389903e01fb2141b6e59b5973cacbb0929021df08dddbe8b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.5.5"
-  sqflite_common_ffi:
-    dependency: "direct dev"
-    description:
-      name: sqflite_common_ffi
-      sha256: "9faa2fedc5385ef238ce772589f7718c24cdddd27419b609bb9c6f703ea27988"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.3.6"
-  sqflite_darwin:
-    dependency: transitive
-    description:
-      name: sqflite_darwin
-      sha256: "279832e5cde3fe99e8571879498c9211f3ca6391b0d818df4e17d9fff5c6ccb3"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.2"
-  sqflite_platform_interface:
-    dependency: transitive
-    description:
-      name: sqflite_platform_interface
-      sha256: "8dd4515c7bdcae0a785b0062859336de775e8c65db81ae33dd5445f35be61920"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.4.0"
-  sqlite3:
-    dependency: transitive
-    description:
-      name: sqlite3
-      sha256: c0503c69b44d5714e6abbf4c1f51a3c3cc42b75ce785f44404765e4635481d38
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.7.6"
-  stack_trace:
-    dependency: transitive
-    description:
-      name: stack_trace
-      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.12.1"
-  stream_channel:
-    dependency: transitive
-    description:
-      name: stream_channel
-      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.4"
-  stream_transform:
-    dependency: transitive
-    description:
-      name: stream_transform
-      sha256: ad47125e588cfd37a9a7f86c7d6356dde8dfe89d071d293f80ca9e9273a33871
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.1"
-  string_scanner:
-    dependency: transitive
-    description:
-      name: string_scanner
-      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.1"
-  synchronized:
-    dependency: transitive
-    description:
-      name: synchronized
-      sha256: c254ade258ec8282947a0acbbc90b9575b4f19673533ee46f2f6e9b3aeefd7c0
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.4.0"
-  term_glyph:
-    dependency: transitive
-    description:
-      name: term_glyph
-      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.2"
-  test_api:
-    dependency: transitive
-    description:
-      name: test_api
-      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.7.4"
-  timing:
-    dependency: transitive
-    description:
-      name: timing
-      sha256: "62ee18aca144e4a9f29d212f5a4c6a053be252b895ab14b5821996cff4ed90fe"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.2"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.0"
-  vector_math:
-    dependency: transitive
-    description:
-      name: vector_math
-      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.4"
-  vm_service:
-    dependency: transitive
-    description:
-      name: vm_service
-      sha256: ddfa8d30d89985b96407efce8acbdd124701f96741f2d981ca860662f1c0dc02
-      url: "https://pub.dev"
-    source: hosted
-    version: "15.0.0"
-  watcher:
-    dependency: transitive
-    description:
-      name: watcher
-      sha256: "0b7fd4a0bbc4b92641dbf20adfd7e3fd1398fe17102d94b674234563e110088a"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
-  web:
-    dependency: transitive
-    description:
-      name: web
-      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.1"
-  web_socket:
-    dependency: transitive
-    description:
-      name: web_socket
-      sha256: "34d64019aa8e36bf9842ac014bb5d2f5586ca73df5e4d9bf5c936975cae6982c"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.1"
-  web_socket_channel:
-    dependency: transitive
-    description:
-      name: web_socket_channel
-      sha256: d645757fb0f4773d602444000a8131ff5d48c9e47adfe9772652dd1a4f2d45c8
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.3"
-  win32:
-    dependency: transitive
-    description:
-      name: win32
-      sha256: "66814138c3562338d05613a6e368ed8cfb237ad6d64a9e9334be3f309acfca03"
-      url: "https://pub.dev"
-    source: hosted
-    version: "5.14.0"
-  xdg_directories:
-    dependency: transitive
-    description:
-      name: xdg_directories
-      sha256: "7a3f37b05d989967cdddcbb571f1ea834867ae2faa29725fd085180e0883aa15"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.0"
-  yaml:
-    dependency: transitive
-    description:
-      name: yaml
-      sha256: b9da305ac7c39faa3f030eccd175340f968459dae4af175130b3fc47e40d76ce
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.1.3"
-sdks:
-  dart: ">=3.8.0 <4.0.0"
-  flutter: ">=3.27.0"
diff --git a/labs/lab04/frontend/pubspec.yaml b/labs/lab04/frontend/pubspec.yaml
deleted file mode 100644
index 0e804d745..000000000
--- a/labs/lab04/frontend/pubspec.yaml
+++ /dev/null
@@ -1,40 +0,0 @@
-name: lab04_frontend
-description: A Flutter lab for database and persistence operations
-
-publish_to: 'none'
-
-version: 1.0.0+1
-
-environment:
-  sdk: '>=3.3.0 <4.0.0'
-  flutter: ">=3.19.0"
-
-dependencies:
-  flutter:
-    sdk: flutter
-  
-  # Database and storage
-  sqflite: ^2.3.0
-  shared_preferences: ^2.2.2
-  flutter_secure_storage: ^9.0.0
-  path_provider: ^2.1.1
-  path: ^1.8.3
-  
-  # JSON serialization
-  json_annotation: ^4.8.1
-
-dev_dependencies:
-  flutter_test:
-    sdk: flutter
-  
-  # JSON code generation
-  json_serializable: ^6.7.1
-  build_runner: ^2.4.7
-  
-  # Testing dependencies
-  sqflite_common_ffi: ^2.3.0
-  
-  flutter_lints: ^3.0.0
-
-flutter:
-  uses-material-design: true
diff --git a/labs/lab04/frontend/test/database_service_test.dart b/labs/lab04/frontend/test/database_service_test.dart
deleted file mode 100644
index f4070c9c9..000000000
--- a/labs/lab04/frontend/test/database_service_test.dart
+++ /dev/null
@@ -1,237 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:sqflite_common_ffi/sqflite_ffi.dart';
-import 'package:lab04_frontend/services/database_service.dart';
-import 'package:lab04_frontend/models/user.dart';
-
-void main() {
-  group('DatabaseService Tests', () {
-    setUpAll(() {
-      // Initialize ffi for testing
-      sqfliteFfiInit();
-      databaseFactory = databaseFactoryFfi;
-    });
-
-    setUp(() async {
-      // Clean up database before each test
-      try {
-        await DatabaseService.clearAllData();
-      } catch (e) {
-        // Database might not exist yet, which is fine
-      }
-    });
-
-    tearDown(() async {
-      // Clean up after each test
-      try {
-        await DatabaseService.closeDatabase();
-      } catch (e) {
-        // Ignore cleanup errors
-      }
-    });
-
-    test('should initialize database', () async {
-      final db = await DatabaseService.database;
-      expect(db, isNotNull);
-    });
-
-    test('should create user successfully', () async {
-      final request = CreateUserRequest(
-        name: 'John Doe',
-        email: 'john@example.com',
-      );
-
-      final user = await DatabaseService.createUser(request);
-
-      expect(user.id, greaterThan(0));
-      expect(user.name, equals(request.name));
-      expect(user.email, equals(request.email));
-      expect(user.createdAt, isNotNull);
-      expect(user.updatedAt, isNotNull);
-    });
-
-    test('should get user by ID', () async {
-      final request = CreateUserRequest(
-        name: 'Jane Doe',
-        email: 'jane@example.com',
-      );
-
-      final createdUser = await DatabaseService.createUser(request);
-      final retrievedUser = await DatabaseService.getUser(createdUser.id);
-
-      expect(retrievedUser, isNotNull);
-      expect(retrievedUser!.id, equals(createdUser.id));
-      expect(retrievedUser.name, equals(createdUser.name));
-      expect(retrievedUser.email, equals(createdUser.email));
-    });
-
-    test('should return null for non-existent user ID', () async {
-      final user = await DatabaseService.getUser(99999);
-      expect(user, isNull);
-    });
-
-    test('should get all users', () async {
-      final requests = [
-        CreateUserRequest(name: 'User 1', email: 'user1@example.com'),
-        CreateUserRequest(name: 'User 2', email: 'user2@example.com'),
-        CreateUserRequest(name: 'User 3', email: 'user3@example.com'),
-      ];
-
-      for (final request in requests) {
-        await DatabaseService.createUser(request);
-      }
-
-      final users = await DatabaseService.getAllUsers();
-      expect(users.length, equals(requests.length));
-
-      for (int i = 0; i < requests.length; i++) {
-        expect(users.any((u) => u.name == requests[i].name), isTrue);
-        expect(users.any((u) => u.email == requests[i].email), isTrue);
-      }
-    });
-
-    test('should return empty list when no users exist', () async {
-      final users = await DatabaseService.getAllUsers();
-      expect(users, isEmpty);
-    });
-
-    test('should update user successfully', () async {
-      final request = CreateUserRequest(
-        name: 'Original Name',
-        email: 'original@example.com',
-      );
-
-      final createdUser = await DatabaseService.createUser(request);
-
-      final updates = {
-        'name': 'Updated Name',
-        'email': 'updated@example.com',
-      };
-
-      final updatedUser =
-          await DatabaseService.updateUser(createdUser.id, updates);
-
-      expect(updatedUser.id, equals(createdUser.id));
-      expect(updatedUser.name, equals('Updated Name'));
-      expect(updatedUser.email, equals('updated@example.com'));
-      expect(updatedUser.updatedAt.isAfter(createdUser.updatedAt), isTrue);
-    });
-
-    test('should update only specified fields', () async {
-      final request = CreateUserRequest(
-        name: 'Original Name',
-        email: 'original@example.com',
-      );
-
-      final createdUser = await DatabaseService.createUser(request);
-
-      final updates = {
-        'name': 'Updated Name Only',
-      };
-
-      final updatedUser =
-          await DatabaseService.updateUser(createdUser.id, updates);
-
-      expect(updatedUser.name, equals('Updated Name Only'));
-      expect(updatedUser.email,
-          equals(createdUser.email)); // Should remain unchanged
-    });
-
-    test('should delete user successfully', () async {
-      final request = CreateUserRequest(
-        name: 'To Be Deleted',
-        email: 'delete@example.com',
-      );
-
-      final createdUser = await DatabaseService.createUser(request);
-
-      await DatabaseService.deleteUser(createdUser.id);
-
-      final deletedUser = await DatabaseService.getUser(createdUser.id);
-      expect(deletedUser, isNull);
-    });
-
-    test('should count users correctly', () async {
-      final initialCount = await DatabaseService.getUserCount();
-      expect(initialCount, equals(0));
-
-      final requests = [
-        CreateUserRequest(name: 'Counter 1', email: 'counter1@example.com'),
-        CreateUserRequest(name: 'Counter 2', email: 'counter2@example.com'),
-      ];
-
-      for (final request in requests) {
-        await DatabaseService.createUser(request);
-      }
-
-      final finalCount = await DatabaseService.getUserCount();
-      expect(finalCount, equals(requests.length));
-    });
-
-    test('should search users by name', () async {
-      final requests = [
-        CreateUserRequest(name: 'John Smith', email: 'john@example.com'),
-        CreateUserRequest(name: 'Jane Doe', email: 'jane@example.com'),
-        CreateUserRequest(name: 'Bob Johnson', email: 'bob@example.com'),
-      ];
-
-      for (final request in requests) {
-        await DatabaseService.createUser(request);
-      }
-
-      final searchResults = await DatabaseService.searchUsers('John');
-      expect(searchResults.length, equals(2)); // John Smith and Bob Johnson
-      expect(searchResults.any((u) => u.name.contains('John')), isTrue);
-    });
-
-    test('should search users by email', () async {
-      final requests = [
-        CreateUserRequest(name: 'Test User 1', email: 'test1@gmail.com'),
-        CreateUserRequest(name: 'Test User 2', email: 'test2@yahoo.com'),
-        CreateUserRequest(name: 'Test User 3', email: 'test3@gmail.com'),
-      ];
-
-      for (final request in requests) {
-        await DatabaseService.createUser(request);
-      }
-
-      final searchResults = await DatabaseService.searchUsers('gmail');
-      expect(searchResults.length, equals(2)); // Users with gmail addresses
-      expect(searchResults.every((u) => u.email.contains('gmail')), isTrue);
-    });
-
-    test('should return empty search results for non-matching query', () async {
-      final request = CreateUserRequest(
-        name: 'Test User',
-        email: 'test@example.com',
-      );
-
-      await DatabaseService.createUser(request);
-
-      final searchResults = await DatabaseService.searchUsers('nonexistent');
-      expect(searchResults, isEmpty);
-    });
-
-    test('should get database path', () async {
-      final path = await DatabaseService.getDatabasePath();
-      expect(path, isNotEmpty);
-      expect(path.contains('lab04_app.db'), isTrue);
-    });
-
-    test('should clear all data', () async {
-      final request = CreateUserRequest(
-        name: 'Test User',
-        email: 'test@example.com',
-      );
-
-      await DatabaseService.createUser(request);
-
-      var count = await DatabaseService.getUserCount();
-      expect(count, equals(1));
-
-      await DatabaseService.clearAllData();
-
-      count = await DatabaseService.getUserCount();
-      expect(count, equals(0));
-    });
-  });
-}
diff --git a/labs/lab04/frontend/test/preferences_service_test.dart b/labs/lab04/frontend/test/preferences_service_test.dart
deleted file mode 100644
index fc873ceec..000000000
--- a/labs/lab04/frontend/test/preferences_service_test.dart
+++ /dev/null
@@ -1,156 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:shared_preferences/shared_preferences.dart';
-import 'package:lab04_frontend/services/preferences_service.dart';
-
-void main() {
-  group('PreferencesService Tests', () {
-    setUp(() async {
-      // Clear SharedPreferences before each test
-      SharedPreferences.setMockInitialValues({});
-      await PreferencesService.init();
-    });
-
-    test('should initialize SharedPreferences', () async {
-      expect(() => PreferencesService.init(), returnsNormally);
-    });
-
-    test('should set and get string values', () async {
-      const key = 'test_string';
-      const value = 'Hello World';
-
-      await PreferencesService.setString(key, value);
-      final result = PreferencesService.getString(key);
-
-      expect(result, equals(value));
-    });
-
-    test('should return null for non-existent string key', () {
-      const key = 'non_existent_key';
-      final result = PreferencesService.getString(key);
-      expect(result, isNull);
-    });
-
-    test('should set and get int values', () async {
-      const key = 'test_int';
-      const value = 42;
-
-      await PreferencesService.setInt(key, value);
-      final result = PreferencesService.getInt(key);
-
-      expect(result, equals(value));
-    });
-
-    test('should return null for non-existent int key', () {
-      const key = 'non_existent_int';
-      final result = PreferencesService.getInt(key);
-      expect(result, isNull);
-    });
-
-    test('should set and get bool values', () async {
-      const key = 'test_bool';
-      const value = true;
-
-      await PreferencesService.setBool(key, value);
-      final result = PreferencesService.getBool(key);
-
-      expect(result, equals(value));
-    });
-
-    test('should set and get string list values', () async {
-      const key = 'test_string_list';
-      const value = ['item1', 'item2', 'item3'];
-
-      await PreferencesService.setStringList(key, value);
-      final result = PreferencesService.getStringList(key);
-
-      expect(result, equals(value));
-    });
-
-    test('should set and get object values', () async {
-      const key = 'test_object';
-      const value = {
-        'name': 'John Doe',
-        'age': 30,
-        'isActive': true,
-      };
-
-      await PreferencesService.setObject(key, value);
-      final result = PreferencesService.getObject(key);
-
-      expect(result, equals(value));
-    });
-
-    test('should return null for non-existent object key', () {
-      const key = 'non_existent_object';
-      final result = PreferencesService.getObject(key);
-      expect(result, isNull);
-    });
-
-    test('should remove specific key', () async {
-      const key = 'test_remove';
-      const value = 'value_to_remove';
-
-      await PreferencesService.setString(key, value);
-      expect(PreferencesService.getString(key), equals(value));
-
-      await PreferencesService.remove(key);
-      expect(PreferencesService.getString(key), isNull);
-    });
-
-    test('should check if key exists', () async {
-      const key = 'test_contains';
-      const value = 'test_value';
-
-      expect(PreferencesService.containsKey(key), isFalse);
-
-      await PreferencesService.setString(key, value);
-      expect(PreferencesService.containsKey(key), isTrue);
-    });
-
-    test('should get all keys', () async {
-      const keys = ['key1', 'key2', 'key3'];
-      const values = ['value1', 'value2', 'value3'];
-
-      for (int i = 0; i < keys.length; i++) {
-        await PreferencesService.setString(keys[i], values[i]);
-      }
-
-      final allKeys = PreferencesService.getAllKeys();
-      for (final key in keys) {
-        expect(allKeys.contains(key), isTrue);
-      }
-    });
-
-    test('should clear all preferences', () async {
-      await PreferencesService.setString('key1', 'value1');
-      await PreferencesService.setInt('key2', 42);
-      await PreferencesService.setBool('key3', true);
-
-      expect(PreferencesService.getAllKeys().length, greaterThan(0));
-
-      await PreferencesService.clear();
-      expect(PreferencesService.getAllKeys().length, equals(0));
-    });
-
-    test('should handle complex object serialization', () async {
-      const key = 'complex_object';
-      final value = {
-        'user': {
-          'id': 123,
-          'name': 'Jane Doe',
-          'preferences': {
-            'theme': 'dark',
-            'notifications': true,
-          },
-          'tags': ['developer', 'flutter', 'dart'],
-        },
-        'timestamp': '2025-01-09T12:00:00Z',
-      };
-
-      await PreferencesService.setObject(key, value);
-      final result = PreferencesService.getObject(key);
-
-      expect(result, equals(value));
-    });
-  });
-}
diff --git a/labs/lab04/frontend/test/secure_storage_service_test.dart b/labs/lab04/frontend/test/secure_storage_service_test.dart
deleted file mode 100644
index deb45a8a3..000000000
--- a/labs/lab04/frontend/test/secure_storage_service_test.dart
+++ /dev/null
@@ -1,245 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
-import 'package:lab04_frontend/services/secure_storage_service.dart';
-
-void main() {
-  // Initialize Flutter bindings for platform channels
-  TestWidgetsFlutterBinding.ensureInitialized(); 
-
-  group('SecureStorageService Tests', () {
-    setUp(() async {
-      // Clear secure storage before each test
-      await SecureStorageService.clearAll();
-    });
-
-    tearDown(() async {
-      // Clean up after each test
-      await SecureStorageService.clearAll();
-    });
-
-    test('should save and get auth token', () async {
-      const token = 'test_auth_token_12345';
-
-      await SecureStorageService.saveAuthToken(token);
-      final retrievedToken = await SecureStorageService.getAuthToken();
-
-      expect(retrievedToken, equals(token));
-    });
-
-    test('should return null for non-existent auth token', () async {
-      final token = await SecureStorageService.getAuthToken();
-      expect(token, isNull);
-    });
-
-    test('should delete auth token', () async {
-      const token = 'token_to_delete';
-
-      await SecureStorageService.saveAuthToken(token);
-      expect(await SecureStorageService.getAuthToken(), equals(token));
-
-      await SecureStorageService.deleteAuthToken();
-      expect(await SecureStorageService.getAuthToken(), isNull);
-    });
-
-    test('should save and get user credentials', () async {
-      const username = 'test_user';
-      const password = 'secure_password_123';
-
-      await SecureStorageService.saveUserCredentials(username, password);
-      final credentials = await SecureStorageService.getUserCredentials();
-
-      expect(credentials['username'], equals(username));
-      expect(credentials['password'], equals(password));
-    });
-
-    test('should return null credentials when not set', () async {
-      final credentials = await SecureStorageService.getUserCredentials();
-      expect(credentials['username'], isNull);
-      expect(credentials['password'], isNull);
-    });
-
-    test('should delete user credentials', () async {
-      const username = 'user_to_delete';
-      const password = 'password_to_delete';
-
-      await SecureStorageService.saveUserCredentials(username, password);
-      expect((await SecureStorageService.getUserCredentials())['username'],
-          equals(username));
-
-      await SecureStorageService.deleteUserCredentials();
-      final credentials = await SecureStorageService.getUserCredentials();
-      expect(credentials['username'], isNull);
-      expect(credentials['password'], isNull);
-    });
-
-    test('should save and get biometric enabled setting', () async {
-      await SecureStorageService.saveBiometricEnabled(true);
-      expect(await SecureStorageService.isBiometricEnabled(), isTrue);
-
-      await SecureStorageService.saveBiometricEnabled(false);
-      expect(await SecureStorageService.isBiometricEnabled(), isFalse);
-    });
-
-    test('should return false for biometric setting when not set', () async {
-      final isEnabled = await SecureStorageService.isBiometricEnabled();
-      expect(isEnabled, isFalse);
-    });
-
-    test('should save and get secure data with custom key', () async {
-      const key = 'custom_secure_key';
-      const value = 'very_secret_data';
-
-      await SecureStorageService.saveSecureData(key, value);
-      final retrievedValue = await SecureStorageService.getSecureData(key);
-
-      expect(retrievedValue, equals(value));
-    });
-
-    test('should return null for non-existent secure data', () async {
-      final value =
-          await SecureStorageService.getSecureData('non_existent_key');
-      expect(value, isNull);
-    });
-
-    test('should delete secure data by key', () async {
-      const key = 'key_to_delete';
-      const value = 'value_to_delete';
-
-      await SecureStorageService.saveSecureData(key, value);
-      expect(await SecureStorageService.getSecureData(key), equals(value));
-
-      await SecureStorageService.deleteSecureData(key);
-      expect(await SecureStorageService.getSecureData(key), isNull);
-    });
-
-    test('should save and get object data', () async {
-      const key = 'user_profile';
-      final objectData = {
-        'id': 123,
-        'name': 'John Doe',
-        'preferences': {
-          'theme': 'dark',
-          'notifications': true,
-        },
-        'roles': ['user', 'admin'],
-      };
-
-      await SecureStorageService.saveObject(key, objectData);
-      final retrievedObject = await SecureStorageService.getObject(key);
-
-      expect(retrievedObject, equals(objectData));
-    });
-
-    test('should return null for non-existent object', () async {
-      final object =
-          await SecureStorageService.getObject('non_existent_object');
-      expect(object, isNull);
-    });
-
-    test('should check if key exists', () async {
-      const key = 'existence_test_key';
-      const value = 'test_value';
-
-      expect(await SecureStorageService.containsKey(key), isFalse);
-
-      await SecureStorageService.saveSecureData(key, value);
-      expect(await SecureStorageService.containsKey(key), isTrue);
-    });
-
-    test('should get all keys', () async {
-      final testData = {
-        'key1': 'value1',
-        'key2': 'value2',
-        'key3': 'value3',
-      };
-
-      for (final entry in testData.entries) {
-        await SecureStorageService.saveSecureData(entry.key, entry.value);
-      }
-
-      final allKeys = await SecureStorageService.getAllKeys();
-      for (final key in testData.keys) {
-        expect(allKeys.contains(key), isTrue);
-      }
-    });
-
-    test('should clear all data', () async {
-      await SecureStorageService.saveAuthToken('test_token');
-      await SecureStorageService.saveUserCredentials('user', 'pass');
-      await SecureStorageService.saveSecureData('key', 'value');
-
-      final keysBeforeClear = await SecureStorageService.getAllKeys();
-      expect(keysBeforeClear.length, greaterThan(0));
-
-      await SecureStorageService.clearAll();
-
-      final keysAfterClear = await SecureStorageService.getAllKeys();
-      expect(keysAfterClear, isEmpty);
-    });
-
-    test('should export all data', () async {
-      final testData = {
-        'auth_token': 'token123',
-        'username': 'testuser',
-        'password': 'testpass',
-        'custom_key': 'custom_value',
-      };
-
-      for (final entry in testData.entries) {
-        await SecureStorageService.saveSecureData(entry.key, entry.value);
-      }
-
-      final exportedData = await SecureStorageService.exportData();
-
-      for (final entry in testData.entries) {
-        expect(exportedData[entry.key], equals(entry.value));
-      }
-    });
-
-    test('should handle complex object serialization', () async {
-      const key = 'complex_settings';
-      final complexObject = {
-        'user': {
-          'id': 456,
-          'profile': {
-            'firstName': 'Jane',
-            'lastName': 'Smith',
-            'avatar': null,
-          },
-          'settings': {
-            'privacy': {
-              'showEmail': false,
-              'showPhone': true,
-            },
-            'notifications': {
-              'email': true,
-              'push': false,
-              'sms': true,
-            },
-          },
-          'tags': ['premium', 'verified'],
-        },
-        'app': {
-          'version': '1.0.0',
-          'lastLogin': '2025-01-09T12:00:00Z',
-          'sessionTimeout': 3600,
-        },
-      };
-
-      await SecureStorageService.saveObject(key, complexObject);
-      final retrievedObject = await SecureStorageService.getObject(key);
-
-      expect(retrievedObject, equals(complexObject));
-    });
-
-    test('should handle empty and null values', () async {
-      await SecureStorageService.saveSecureData('empty_string', '');
-      final emptyValue =
-          await SecureStorageService.getSecureData('empty_string');
-      expect(emptyValue, equals(''));
-
-      final nullObject = await SecureStorageService.getObject('null_object');
-      expect(nullObject, isNull);
-    });
-  });
-}
diff --git a/labs/lab04/frontend/web/favicon.png b/labs/lab04/frontend/web/favicon.png
deleted file mode 100644
index 8aaa46ac1..000000000
Binary files a/labs/lab04/frontend/web/favicon.png and /dev/null differ
diff --git a/labs/lab04/frontend/web/icons/Icon-192.png b/labs/lab04/frontend/web/icons/Icon-192.png
deleted file mode 100644
index b749bfef0..000000000
Binary files a/labs/lab04/frontend/web/icons/Icon-192.png and /dev/null differ
diff --git a/labs/lab04/frontend/web/icons/Icon-512.png b/labs/lab04/frontend/web/icons/Icon-512.png
deleted file mode 100644
index 88cfd48df..000000000
Binary files a/labs/lab04/frontend/web/icons/Icon-512.png and /dev/null differ
diff --git a/labs/lab04/frontend/web/icons/Icon-maskable-192.png b/labs/lab04/frontend/web/icons/Icon-maskable-192.png
deleted file mode 100644
index eb9b4d76e..000000000
Binary files a/labs/lab04/frontend/web/icons/Icon-maskable-192.png and /dev/null differ
diff --git a/labs/lab04/frontend/web/icons/Icon-maskable-512.png b/labs/lab04/frontend/web/icons/Icon-maskable-512.png
deleted file mode 100644
index d69c56691..000000000
Binary files a/labs/lab04/frontend/web/icons/Icon-maskable-512.png and /dev/null differ
diff --git a/labs/lab04/frontend/web/index.html b/labs/lab04/frontend/web/index.html
deleted file mode 100644
index 7c602e6a1..000000000
--- a/labs/lab04/frontend/web/index.html
+++ /dev/null
@@ -1,52 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-  <base href="$FLUTTER_BASE_HREF">
-  <meta charset="UTF-8">
-  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
-  <meta name="description" content="Lab 04 - Database and Persistence Flutter Demo">
-  <meta name="apple-mobile-web-app-capable" content="yes">
-  <meta name="apple-mobile-web-app-status-bar-style" content="black">
-  <meta name="apple-mobile-web-app-title" content="Lab 04 Frontend">
-  <link rel="apple-touch-icon" href="icons/Icon-192.png">
-  <link rel="icon" type="image/png" href="favicon.png"/>
-  <title>Lab 04 - Database &amp; Persistence</title>
-  <link rel="manifest" href="manifest.json">
-  <script>
-    var serviceWorkerVersion = null;
-    var scriptLoaded = false;
-    
-    function loadMainDartJs() {
-      if (scriptLoaded) {
-        return;
-      }
-      scriptLoaded = true;
-      var scriptTag = document.createElement('script');
-      scriptTag.src = 'main.dart.js';
-      scriptTag.type = 'application/javascript';
-      document.body.append(scriptTag);
-    }
-
-    if ('serviceWorker' in navigator) {
-      window.addEventListener('load', function () {
-        navigator.serviceWorker.register('flutter_service_worker.js');
-      });
-    }
-  </script>
-</head>
-<body>
-  <script>
-    window.addEventListener('load', function(ev) {
-      _flutter.loader.loadEntrypoint({
-        serviceWorker: {
-          serviceWorkerVersion: serviceWorkerVersion,
-        }
-      }).then(function(engineInitializer) {
-        return engineInitializer.initializeEngine();
-      }).then(function(appRunner) {
-        return appRunner.runApp();
-      });
-    });
-  </script>
-</body>
-</html>
diff --git a/labs/lab04/frontend/web/manifest.json b/labs/lab04/frontend/web/manifest.json
deleted file mode 100644
index 409f4c96f..000000000
--- a/labs/lab04/frontend/web/manifest.json
+++ /dev/null
@@ -1,35 +0,0 @@
-{
-    "name": "frontend",
-    "short_name": "frontend",
-    "start_url": ".",
-    "display": "standalone",
-    "background_color": "#0175C2",
-    "theme_color": "#0175C2",
-    "description": "A new Flutter project.",
-    "orientation": "portrait-primary",
-    "prefer_related_applications": false,
-    "icons": [
-        {
-            "src": "icons/Icon-192.png",
-            "sizes": "192x192",
-            "type": "image/png"
-        },
-        {
-            "src": "icons/Icon-512.png",
-            "sizes": "512x512",
-            "type": "image/png"
-        },
-        {
-            "src": "icons/Icon-maskable-192.png",
-            "sizes": "192x192",
-            "type": "image/png",
-            "purpose": "maskable"
-        },
-        {
-            "src": "icons/Icon-maskable-512.png",
-            "sizes": "512x512",
-            "type": "image/png",
-            "purpose": "maskable"
-        }
-    ]
-}
diff --git a/labs/lab05/backend/jwtservice/jwt.go b/labs/lab05/backend/jwtservice/jwt.go
index 860541df4..6bbd4eba9 100644
--- a/labs/lab05/backend/jwtservice/jwt.go
+++ b/labs/lab05/backend/jwtservice/jwt.go
@@ -2,7 +2,9 @@ package jwtservice
 
 import (
 	"errors"
-	_ "github.com/golang-jwt/jwt/v4"
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
 )
 
 // JWTService handles JWT token operations
@@ -10,39 +12,65 @@ type JWTService struct {
 	secretKey string
 }
 
-// TODO: Implement NewJWTService function
-// NewJWTService creates a new JWT service
-// Requirements:
-// - secretKey must not be empty
 func NewJWTService(secretKey string) (*JWTService, error) {
-	// TODO: Implement this function
-	// Validate secretKey and create service instance
-	return nil, errors.New("not implemented")
+	if secretKey == "" {
+		return nil, ErrEmptySecretKey
+	}
+
+	newJWT := &JWTService{secretKey: secretKey}
+	return newJWT, nil
 }
 
-// TODO: Implement GenerateToken method
-// GenerateToken creates a new JWT token with user claims
-// Requirements:
-// - userID must be positive
-// - email must not be empty
-// - Token expires in 24 hours
-// - Use HS256 signing method
 func (j *JWTService) GenerateToken(userID int, email string) (string, error) {
-	// TODO: Implement token generation
-	// Create claims with userID, email, and expiration
-	// Sign token with secret key
-	return "", errors.New("not implemented")
+	if userID <= 0 {
+		return "", ErrNonPosUserID
+	}
+	if email == "" {
+		return "", ErrEmptyEmail
+	}
+
+	claims := Claims{
+		UserID: userID,
+		Email:  email,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour * 24)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	generatedToken := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return generatedToken.SignedString([]byte(j.secretKey))
 }
 
-// TODO: Implement ValidateToken method
-// ValidateToken parses and validates a JWT token
-// Requirements:
-// - Check token signature with secret key
-// - Verify token is not expired
-// - Return parsed claims on success
 func (j *JWTService) ValidateToken(tokenString string) (*Claims, error) {
-	// TODO: Implement token validation
-	// Parse token and verify signature
-	// Return claims if valid
-	return nil, errors.New("not implemented")
+	token, err := jwt.Parse(tokenString,
+		func(token *jwt.Token) (interface{}, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, ErrUnexpSignMethod
+			}
+			return []byte(j.secretKey), nil
+		})
+
+	if err != nil || !token.Valid {
+		return nil, ErrInvToken
+	}
+
+	claims, ok := token.Claims.(jwt.MapClaims)
+	if !ok {
+		return nil, ErrInvClaims
+	}
+
+	return &Claims{
+		UserID: int(claims["user_id"].(float64)),
+		Email:  claims["email"].(string),
+	}, nil
 }
+
+var (
+	ErrEmptySecretKey  = errors.New("secret cannot be empty")
+	ErrNonPosUserID    = errors.New("user ID must be positive")
+	ErrEmptyEmail      = errors.New("email cannot be empty")
+	ErrUnexpSignMethod = errors.New("unexpected signing method")
+	ErrInvToken        = errors.New("invalid token")
+	ErrInvClaims       = errors.New("invalid claims")
+)
diff --git a/labs/lab05/backend/security/password.go b/labs/lab05/backend/security/password.go
index 484f80ab8..9533c2562 100644
--- a/labs/lab05/backend/security/password.go
+++ b/labs/lab05/backend/security/password.go
@@ -2,54 +2,50 @@ package security
 
 import (
 	"errors"
-	_ "regexp"
+	"strings"
 
-	_ "golang.org/x/crypto/bcrypt"
+	"golang.org/x/crypto/bcrypt"
 )
 
 // PasswordService handles password operations
 type PasswordService struct{}
 
-// TODO: Implement NewPasswordService function
-// NewPasswordService creates a new password service
 func NewPasswordService() *PasswordService {
-	// TODO: Implement this function
-	// Return a new PasswordService instance
-	return nil
+	return &PasswordService{}
 }
 
-// TODO: Implement HashPassword method
-// HashPassword hashes a password using bcrypt
-// Requirements:
-// - password must not be empty
-// - use bcrypt with cost 10
-// - return the hashed password as string
 func (p *PasswordService) HashPassword(password string) (string, error) {
-	// TODO: Implement password hashing
-	// Use golang.org/x/crypto/bcrypt.GenerateFromPassword
-	return "", errors.New("not implemented")
+	if err := ValidatePassword(password); err != nil {
+		return "", err
+	}
+
+	hashedPw, err := bcrypt.GenerateFromPassword([]byte(password), 10)
+	if err != nil {
+		return "", nil
+	}
+	return string(hashedPw), nil
 }
 
-// TODO: Implement VerifyPassword method
-// VerifyPassword checks if password matches hash
-// Requirements:
-// - password and hash must not be empty
-// - return true if password matches hash
-// - return false if password doesn't match
 func (p *PasswordService) VerifyPassword(password, hash string) bool {
-	// TODO: Implement password verification
-	// Use bcrypt.CompareHashAndPassword
-	// Return true only if passwords match exactly
-	return false
+	compareResult := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return compareResult == nil
 }
 
-// TODO: Implement ValidatePassword function
-// ValidatePassword checks if password meets basic requirements
-// Requirements:
-// - At least 6 characters
-// - Contains at least one letter and one number
 func ValidatePassword(password string) error {
-	// TODO: Implement password validation
-	// Check length and basic complexity requirements
-	return errors.New("not implemented")
+	if len(password) < 6 {
+		return ErrInvPw
+	}
+	if !strings.ContainsAny(password, letters) || !strings.ContainsAny(password, numbers) {
+		return ErrInvPw
+	}
+	return nil
 }
+
+var (
+	ErrInvPw = errors.New("password must be at least 6 charecters long and contain at least one letter and one number")
+)
+
+var (
+	letters = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm"
+	numbers = "1234567890"
+)
diff --git a/labs/lab05/backend/userdomain/user.go b/labs/lab05/backend/userdomain/user.go
index 8794c595f..0218ddc05 100644
--- a/labs/lab05/backend/userdomain/user.go
+++ b/labs/lab05/backend/userdomain/user.go
@@ -2,7 +2,7 @@ package userdomain
 
 import (
 	"errors"
-	_ "regexp"
+	"regexp"
 	"strings"
 	"time"
 )
@@ -17,52 +17,70 @@ type User struct {
 	UpdatedAt time.Time `json:"updated_at"`
 }
 
-// TODO: Implement NewUser function
-// NewUser creates a new user with validation
-// Requirements:
-// - Email must be valid format
-// - Name must be 2-51 characters
-// - Password must be at least 8 characters
-// - CreatedAt and UpdatedAt should be set to current time
 func NewUser(email, name, password string) (*User, error) {
-	// TODO: Implement this function
-	// Hint: Use ValidateEmail, ValidateName, ValidatePassword helper functions
-	return nil, errors.New("not implemented")
+	if err := ValidateEmail(email); err != nil {
+		return nil, err
+	}
+	if err := ValidateName(name); err != nil {
+		return nil, err
+	}
+	if err := ValidatePassword(password); err != nil {
+		return nil, err
+	}
+
+	timeNow := time.Now()
+
+	user := &User{
+		Email:     strings.ToLower(strings.TrimSpace(email)),
+		Name:      strings.TrimSpace(name),
+		Password:  strings.TrimSpace(password),
+		CreatedAt: timeNow,
+		UpdatedAt: timeNow,
+	}
+
+	return user, nil
 }
 
-// TODO: Implement Validate method
-// Validate checks if the user data is valid
 func (u *User) Validate() error {
-	// TODO: Implement validation logic
-	// Check email, name, and password validity
-	return errors.New("not implemented")
+	if err := ValidateEmail(u.Email); err != nil {
+		return err
+	}
+	if err := ValidateName(u.Name); err != nil {
+		return err
+	}
+	if err := ValidatePassword(u.Password); err != nil {
+		return err
+	}
+	return nil
 }
 
-// TODO: Implement ValidateEmail function
-// ValidateEmail checks if email format is valid
 func ValidateEmail(email string) error {
-	// TODO: Implement email validation
-	// Use regex pattern to validate email format
-	// Email should not be empty and should match standard email pattern
-	return errors.New("not implemented")
+	normEmail := strings.ToLower(strings.TrimSpace(email))
+	if !emailRegex.MatchString(normEmail) {
+		return ErrInvEmail
+	}
+	return nil
 }
 
-// TODO: Implement ValidateName function
-// ValidateName checks if name is valid
 func ValidateName(name string) error {
-	// TODO: Implement name validation
-	// Name should be 2-50 characters, trimmed of whitespace
-	// Should not be empty after trimming
-	return errors.New("not implemented")
+	trimmedName := strings.TrimSpace(name)
+
+	if len(trimmedName) < 2 || len(trimmedName) > 50 {
+		return ErrInvName
+	}
+	return nil
 }
 
-// TODO: Implement ValidatePassword function
-// ValidatePassword checks if password meets security requirements
 func ValidatePassword(password string) error {
-	// TODO: Implement password validation
-	// Password should be at least 8 characters
-	// Should contain at least one uppercase, lowercase, and number
-	return errors.New("not implemented")
+	valid := len(password) >= 8
+	valid = valid && strings.ContainsAny(password, uppsercase)
+	valid = valid && strings.ContainsAny(password, lowercase)
+	valid = valid && strings.ContainsAny(password, numbers)
+
+	if !valid {
+		return ErrInvPassword
+	}
+	return nil
 }
 
 // UpdateName updates the user's name with validation
@@ -84,3 +102,17 @@ func (u *User) UpdateEmail(email string) error {
 	u.UpdatedAt = time.Now()
 	return nil
 }
+
+var (
+	uppsercase = "QWERTYUIOPASDFGHJKLZXCVBNM"
+	lowercase  = "qwertyuiopasdfghjklzxcvbnm"
+	numbers    = "1234567890"
+)
+
+var emailRegex = regexp.MustCompile(`^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$`)
+
+var (
+	ErrInvPassword = errors.New("password should be at least 8 characters long, contain at least one uppercase letter, lowercase letter and a number")
+	ErrInvName     = errors.New("name should be from 2 to 50 characters long")
+	ErrInvEmail    = errors.New("invalid email format")
+)
diff --git a/labs/lab05/frontend/.dart_tool/flutter_build/dart_plugin_registrant.dart b/labs/lab05/frontend/.dart_tool/flutter_build/dart_plugin_registrant.dart
new file mode 100644
index 000000000..0c4415651
--- /dev/null
+++ b/labs/lab05/frontend/.dart_tool/flutter_build/dart_plugin_registrant.dart
@@ -0,0 +1,82 @@
+//
+// Generated file. Do not edit.
+// This file is generated from template in file `flutter_tools/lib/src/flutter_plugins.dart`.
+//
+
+// @dart = 3.5
+
+import 'dart:io'; // flutter_ignore: dart_io_import.
+import 'package:path_provider_android/path_provider_android.dart';
+import 'package:path_provider_foundation/path_provider_foundation.dart';
+import 'package:path_provider_linux/path_provider_linux.dart';
+import 'package:path_provider_foundation/path_provider_foundation.dart';
+import 'package:flutter_secure_storage_windows/flutter_secure_storage_windows.dart';
+import 'package:path_provider_windows/path_provider_windows.dart';
+
+@pragma('vm:entry-point')
+class _PluginRegistrant {
+
+  @pragma('vm:entry-point')
+  static void register() {
+    if (Platform.isAndroid) {
+      try {
+        PathProviderAndroid.registerWith();
+      } catch (err) {
+        print(
+          '`path_provider_android` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+    } else if (Platform.isIOS) {
+      try {
+        PathProviderFoundation.registerWith();
+      } catch (err) {
+        print(
+          '`path_provider_foundation` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+    } else if (Platform.isLinux) {
+      try {
+        PathProviderLinux.registerWith();
+      } catch (err) {
+        print(
+          '`path_provider_linux` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+    } else if (Platform.isMacOS) {
+      try {
+        PathProviderFoundation.registerWith();
+      } catch (err) {
+        print(
+          '`path_provider_foundation` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+    } else if (Platform.isWindows) {
+      try {
+        FlutterSecureStorageWindows.registerWith();
+      } catch (err) {
+        print(
+          '`flutter_secure_storage_windows` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+      try {
+        PathProviderWindows.registerWith();
+      } catch (err) {
+        print(
+          '`path_provider_windows` threw an error: $err. '
+          'The app may not function as expected until you remove this plugin from pubspec.yaml'
+        );
+      }
+
+    }
+  }
+}
diff --git a/labs/lab05/frontend/.dart_tool/package_config.json b/labs/lab05/frontend/.dart_tool/package_config.json
index 17f4ca1e5..ca6bad0ef 100644
--- a/labs/lab05/frontend/.dart_tool/package_config.json
+++ b/labs/lab05/frontend/.dart_tool/package_config.json
@@ -3,547 +3,547 @@
   "packages": [
     {
       "name": "_fe_analyzer_shared",
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+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/pub_semver-2.2.0",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "pubspec_parse",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/pubspec_parse-1.5.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/pubspec_parse-1.5.0",
       "packageUri": "lib/",
       "languageVersion": "3.6"
     },
     {
       "name": "shelf",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/shelf-1.4.2",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/shelf-1.4.2",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "shelf_web_socket",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/shelf_web_socket-3.0.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/shelf_web_socket-3.0.0",
       "packageUri": "lib/",
       "languageVersion": "3.5"
     },
     {
       "name": "sky_engine",
-      "rootUri": "file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/bin/cache/pkg/sky_engine",
+      "rootUri": "file:///home/pavmash/flutter/bin/cache/pkg/sky_engine",
       "packageUri": "lib/",
       "languageVersion": "3.7"
     },
     {
       "name": "source_gen",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/source_gen-2.0.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/source_gen-2.0.0",
       "packageUri": "lib/",
       "languageVersion": "3.6"
     },
     {
       "name": "source_span",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/source_span-1.10.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/source_span-1.10.1",
       "packageUri": "lib/",
       "languageVersion": "3.1"
     },
     {
       "name": "stack_trace",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/stack_trace-1.12.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/stack_trace-1.12.1",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "stream_channel",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/stream_channel-2.1.4",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/stream_channel-2.1.4",
       "packageUri": "lib/",
       "languageVersion": "3.3"
     },
     {
       "name": "stream_transform",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/stream_transform-2.1.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/stream_transform-2.1.1",
       "packageUri": "lib/",
       "languageVersion": "3.1"
     },
     {
       "name": "string_scanner",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/string_scanner-1.4.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/string_scanner-1.4.1",
       "packageUri": "lib/",
       "languageVersion": "3.1"
     },
     {
       "name": "term_glyph",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/term_glyph-1.2.2",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/term_glyph-1.2.2",
       "packageUri": "lib/",
       "languageVersion": "3.1"
     },
     {
       "name": "test_api",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/test_api-0.7.4",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/test_api-0.7.4",
       "packageUri": "lib/",
       "languageVersion": "3.5"
     },
     {
       "name": "timing",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/timing-1.0.2",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/timing-1.0.2",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "typed_data",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/typed_data-1.4.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/typed_data-1.4.0",
       "packageUri": "lib/",
       "languageVersion": "3.5"
     },
     {
       "name": "vector_math",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/vector_math-2.1.4",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/vector_math-2.1.4",
       "packageUri": "lib/",
       "languageVersion": "2.14"
     },
     {
       "name": "vm_service",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/vm_service-15.0.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/vm_service-15.0.0",
       "packageUri": "lib/",
       "languageVersion": "3.3"
     },
     {
       "name": "watcher",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/watcher-1.1.2",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/watcher-1.1.2",
       "packageUri": "lib/",
       "languageVersion": "3.1"
     },
     {
       "name": "web",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/web-1.1.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/web-1.1.1",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "web_socket",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/web_socket-1.0.1",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/web_socket-1.0.1",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
     {
       "name": "web_socket_channel",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/web_socket_channel-3.0.3",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/web_socket_channel-3.0.3",
       "packageUri": "lib/",
       "languageVersion": "3.3"
     },
     {
       "name": "win32",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/win32-5.14.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/win32-5.14.0",
       "packageUri": "lib/",
       "languageVersion": "3.8"
     },
     {
       "name": "xdg_directories",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/xdg_directories-1.1.0",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/xdg_directories-1.1.0",
       "packageUri": "lib/",
       "languageVersion": "3.3"
     },
     {
       "name": "yaml",
-      "rootUri": "file:///Users/timur/.pub-cache/hosted/pub.dev/yaml-3.1.3",
+      "rootUri": "file:///home/pavmash/.pub-cache/hosted/pub.dev/yaml-3.1.3",
       "packageUri": "lib/",
       "languageVersion": "3.4"
     },
@@ -556,7 +556,7 @@
   ],
   "generator": "pub",
   "generatorVersion": "3.8.1",
-  "flutterRoot": "file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter",
-  "flutterVersion": "3.32.4",
-  "pubCache": "file:///Users/timur/.pub-cache"
+  "flutterRoot": "file:///home/pavmash/flutter",
+  "flutterVersion": "3.32.5",
+  "pubCache": "file:///home/pavmash/.pub-cache"
 }
diff --git a/labs/lab05/frontend/.dart_tool/package_config_subset b/labs/lab05/frontend/.dart_tool/package_config_subset
index 00584b939..2b4ea566e 100644
--- a/labs/lab05/frontend/.dart_tool/package_config_subset
+++ b/labs/lab05/frontend/.dart_tool/package_config_subset
@@ -1,369 +1,369 @@
 _fe_analyzer_shared
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/_fe_analyzer_shared-85.0.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/_fe_analyzer_shared-85.0.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/_fe_analyzer_shared-85.0.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/_fe_analyzer_shared-85.0.0/lib/
 analyzer
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/analyzer-7.5.6/
-file:///Users/timur/.pub-cache/hosted/pub.dev/analyzer-7.5.6/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/analyzer-7.5.6/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/analyzer-7.5.6/lib/
 args
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/args-2.7.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/args-2.7.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/args-2.7.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/args-2.7.0/lib/
 async
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/async-2.13.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/async-2.13.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/async-2.13.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/async-2.13.0/lib/
 boolean_selector
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2/lib/
 build
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/build-2.5.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build-2.5.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build-2.5.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build-2.5.4/lib/
 build_config
 3.6
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_config-1.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_config-1.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_config-1.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_config-1.1.2/lib/
 build_daemon
 3.6
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_daemon-4.0.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_daemon-4.0.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_daemon-4.0.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_daemon-4.0.4/lib/
 build_resolvers
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_resolvers-2.5.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_resolvers-2.5.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_resolvers-2.5.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_resolvers-2.5.4/lib/
 build_runner
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_runner-2.5.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_runner-2.5.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_runner-2.5.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_runner-2.5.4/lib/
 build_runner_core
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_runner_core-9.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/build_runner_core-9.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_runner_core-9.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/build_runner_core-9.1.2/lib/
 built_collection
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/built_collection-5.1.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/built_collection-5.1.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/built_collection-5.1.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/built_collection-5.1.1/lib/
 built_value
 3.0
-file:///Users/timur/.pub-cache/hosted/pub.dev/built_value-8.10.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/built_value-8.10.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/built_value-8.10.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/built_value-8.10.1/lib/
 characters
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/characters-1.4.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/characters-1.4.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/characters-1.4.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/characters-1.4.0/lib/
 checked_yaml
 3.8
-file:///Users/timur/.pub-cache/hosted/pub.dev/checked_yaml-2.0.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/checked_yaml-2.0.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/checked_yaml-2.0.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/checked_yaml-2.0.4/lib/
 clock
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/clock-1.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/clock-1.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/clock-1.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/clock-1.1.2/lib/
 code_builder
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/code_builder-4.10.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/code_builder-4.10.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/code_builder-4.10.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/code_builder-4.10.1/lib/
 collection
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/collection-1.19.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/collection-1.19.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/collection-1.19.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/collection-1.19.1/lib/
 convert
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/convert-3.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/convert-3.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/convert-3.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/convert-3.1.2/lib/
 crypto
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/crypto-3.0.6/
-file:///Users/timur/.pub-cache/hosted/pub.dev/crypto-3.0.6/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/crypto-3.0.6/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/crypto-3.0.6/lib/
 dart_style
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/dart_style-3.1.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/dart_style-3.1.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/dart_style-3.1.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/dart_style-3.1.0/lib/
 dartz
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/dartz-0.10.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/dartz-0.10.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/dartz-0.10.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/dartz-0.10.1/lib/
 equatable
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/equatable-2.0.7/
-file:///Users/timur/.pub-cache/hosted/pub.dev/equatable-2.0.7/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/equatable-2.0.7/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/equatable-2.0.7/lib/
 fake_async
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/fake_async-1.3.3/
-file:///Users/timur/.pub-cache/hosted/pub.dev/fake_async-1.3.3/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/fake_async-1.3.3/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/fake_async-1.3.3/lib/
 ffi
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/ffi-2.1.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/ffi-2.1.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/ffi-2.1.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/ffi-2.1.4/lib/
 file
 3.0
-file:///Users/timur/.pub-cache/hosted/pub.dev/file-7.0.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/file-7.0.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/file-7.0.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/file-7.0.1/lib/
 fixnum
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/fixnum-1.1.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/fixnum-1.1.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/fixnum-1.1.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/fixnum-1.1.1/lib/
 flutter_lints
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_lints-3.0.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_lints-3.0.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_lints-3.0.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_lints-3.0.2/lib/
 flutter_secure_storage
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage-9.2.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage-9.2.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage-9.2.4/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage-9.2.4/lib/
 flutter_secure_storage_linux
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_linux-1.2.3/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_linux-1.2.3/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_linux-1.2.3/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_linux-1.2.3/lib/
 flutter_secure_storage_macos
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_macos-3.1.3/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_macos-3.1.3/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_macos-3.1.3/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_macos-3.1.3/lib/
 flutter_secure_storage_platform_interface
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_platform_interface-1.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_platform_interface-1.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_platform_interface-1.1.2/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_platform_interface-1.1.2/lib/
 flutter_secure_storage_web
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_web-1.2.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_web-1.2.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_web-1.2.1/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_web-1.2.1/lib/
 flutter_secure_storage_windows
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_windows-3.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/flutter_secure_storage_windows-3.1.2/lib/
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/flutter_secure_storage_windows-3.1.2/lib/
 frontend_server_client
 3.0
-file:///Users/timur/.pub-cache/hosted/pub.dev/frontend_server_client-4.0.0/
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 glob
 3.3
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 graphs
 3.4
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 http
 3.4
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 http_multi_server
 3.2
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 http_parser
 3.4
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 io
 3.4
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 js
 2.19
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 json_annotation
 3.0
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 leak_tracker
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/leak_tracker-10.0.9/
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 leak_tracker_flutter_testing
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/leak_tracker_flutter_testing-3.0.9/
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 leak_tracker_testing
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/leak_tracker_testing-3.0.1/
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 lints
 3.0
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 logging
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/logging-1.3.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/logging-1.3.0/lib/
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 matcher
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/matcher-0.12.17/
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 material_color_utilities
 2.17
-file:///Users/timur/.pub-cache/hosted/pub.dev/material_color_utilities-0.11.1/
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 meta
 2.12
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 mime
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/mime-2.0.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/mime-2.0.0/lib/
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 mockito
 3.7
-file:///Users/timur/.pub-cache/hosted/pub.dev/mockito-5.4.6/
-file:///Users/timur/.pub-cache/hosted/pub.dev/mockito-5.4.6/lib/
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 package_config
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/package_config-2.2.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/package_config-2.2.0/lib/
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 path
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/path-1.9.1/
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 path_provider
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider-2.1.5/
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 path_provider_android
 3.6
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_android-2.2.17/
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_android-2.2.17/lib/
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 path_provider_foundation
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_foundation-2.4.1/
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 path_provider_linux
 2.19
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.1/lib/
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 path_provider_platform_interface
 3.0
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_platform_interface-2.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_platform_interface-2.1.2/lib/
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 path_provider_windows
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/lib/
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 platform
 3.2
-file:///Users/timur/.pub-cache/hosted/pub.dev/platform-3.1.6/
-file:///Users/timur/.pub-cache/hosted/pub.dev/platform-3.1.6/lib/
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 plugin_platform_interface
 3.0
-file:///Users/timur/.pub-cache/hosted/pub.dev/plugin_platform_interface-2.1.8/
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 pool
 2.12
-file:///Users/timur/.pub-cache/hosted/pub.dev/pool-1.5.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/pool-1.5.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/pool-1.5.1/
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 pub_semver
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/pub_semver-2.2.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/pub_semver-2.2.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/pub_semver-2.2.0/
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 pubspec_parse
 3.6
-file:///Users/timur/.pub-cache/hosted/pub.dev/pubspec_parse-1.5.0/
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/pubspec_parse-1.5.0/
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 shelf
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/shelf-1.4.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/shelf-1.4.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/shelf-1.4.2/
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 shelf_web_socket
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/shelf_web_socket-3.0.0/
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 source_gen
 3.6
-file:///Users/timur/.pub-cache/hosted/pub.dev/source_gen-2.0.0/
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/source_gen-2.0.0/
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 source_span
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/source_span-1.10.1/
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/source_span-1.10.1/
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 stack_trace
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/stack_trace-1.12.1/
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 stream_channel
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/stream_channel-2.1.4/
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 stream_transform
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/stream_transform-2.1.1/
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 string_scanner
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/string_scanner-1.4.1/
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 term_glyph
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/term_glyph-1.2.2/
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 test_api
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/test_api-0.7.4/
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 timing
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/timing-1.0.2/
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/timing-1.0.2/
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 typed_data
 3.5
-file:///Users/timur/.pub-cache/hosted/pub.dev/typed_data-1.4.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/typed_data-1.4.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/typed_data-1.4.0/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/typed_data-1.4.0/lib/
 vector_math
 2.14
-file:///Users/timur/.pub-cache/hosted/pub.dev/vector_math-2.1.4/
-file:///Users/timur/.pub-cache/hosted/pub.dev/vector_math-2.1.4/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/vector_math-2.1.4/
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 vm_service
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/vm_service-15.0.0/
-file:///Users/timur/.pub-cache/hosted/pub.dev/vm_service-15.0.0/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/vm_service-15.0.0/
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 watcher
 3.1
-file:///Users/timur/.pub-cache/hosted/pub.dev/watcher-1.1.2/
-file:///Users/timur/.pub-cache/hosted/pub.dev/watcher-1.1.2/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/watcher-1.1.2/
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 web
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/web-1.1.1/
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 web_socket
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/web_socket-1.0.1/
-file:///Users/timur/.pub-cache/hosted/pub.dev/web_socket-1.0.1/lib/
+file:///home/pavmash/.pub-cache/hosted/pub.dev/web_socket-1.0.1/
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 web_socket_channel
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/web_socket_channel-3.0.3/
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 win32
 3.8
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+file:///home/pavmash/.pub-cache/hosted/pub.dev/win32-5.14.0/
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 xdg_directories
 3.3
-file:///Users/timur/.pub-cache/hosted/pub.dev/xdg_directories-1.1.0/
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 yaml
 3.4
-file:///Users/timur/.pub-cache/hosted/pub.dev/yaml-3.1.3/
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-lab05_frontend
-3.5
-file:///Users/timur/develop/sum25-go-flutter-course/labs/lab05/frontend/
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 sky_engine
 3.7
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/bin/cache/pkg/sky_engine/
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 flutter
 3.7
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter/
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter/lib/
+file:///home/pavmash/flutter/packages/flutter/
+file:///home/pavmash/flutter/packages/flutter/lib/
 flutter_test
 3.7
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter_test/
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter_test/lib/
+file:///home/pavmash/flutter/packages/flutter_test/
+file:///home/pavmash/flutter/packages/flutter_test/lib/
 flutter_web_plugins
 3.7
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter_web_plugins/
-file:///opt/homebrew/Caskroom/flutter/3.32.4/flutter/packages/flutter_web_plugins/lib/
+file:///home/pavmash/flutter/packages/flutter_web_plugins/
+file:///home/pavmash/flutter/packages/flutter_web_plugins/lib/
+lab05_frontend
+3.5
+file:///home/pavmash/sum25-go-flutter-course/labs/lab05/frontend/
+file:///home/pavmash/sum25-go-flutter-course/labs/lab05/frontend/lib/
 2
diff --git a/labs/lab05/frontend/.dart_tool/package_graph.json b/labs/lab05/frontend/.dart_tool/package_graph.json
index 67f13503a..0d10a4d62 100644
--- a/labs/lab05/frontend/.dart_tool/package_graph.json
+++ b/labs/lab05/frontend/.dart_tool/package_graph.json
@@ -77,6 +77,13 @@
         "test_api"
       ]
     },
+    {
+      "name": "flutter_lints",
+      "version": "3.0.2",
+      "dependencies": [
+        "lints"
+      ]
+    },
     {
       "name": "flutter_test",
       "version": "0.0.0",
@@ -534,6 +541,11 @@
         "test_api"
       ]
     },
+    {
+      "name": "lints",
+      "version": "3.0.0",
+      "dependencies": []
+    },
     {
       "name": "vm_service",
       "version": "15.0.0",
@@ -870,18 +882,6 @@
         "meta",
         "path"
       ]
-    },
-    {
-      "name": "flutter_lints",
-      "version": "3.0.2",
-      "dependencies": [
-        "lints"
-      ]
-    },
-    {
-      "name": "lints",
-      "version": "3.0.0",
-      "dependencies": []
     }
   ],
   "configVersion": 1
diff --git a/labs/lab05/frontend/.dart_tool/version b/labs/lab05/frontend/.dart_tool/version
index 462914540..28fb4be5e 100644
--- a/labs/lab05/frontend/.dart_tool/version
+++ b/labs/lab05/frontend/.dart_tool/version
@@ -1 +1 @@
-3.32.4
\ No newline at end of file
+3.32.5
\ No newline at end of file
diff --git a/labs/lab05/frontend/build/native_assets/linux/native_assets.json b/labs/lab05/frontend/build/native_assets/linux/native_assets.json
new file mode 100644
index 000000000..523bfc7c6
--- /dev/null
+++ b/labs/lab05/frontend/build/native_assets/linux/native_assets.json
@@ -0,0 +1 @@
+{"format-version":[1,0,0],"native-assets":{}}
\ No newline at end of file
diff --git a/labs/lab05/frontend/build/test_cache/build/5ed1ec56e46357ec5ad2faed02821e03.cache.dill.track.dill b/labs/lab05/frontend/build/test_cache/build/5ed1ec56e46357ec5ad2faed02821e03.cache.dill.track.dill
new file mode 100644
index 000000000..c35a28f89
Binary files /dev/null and b/labs/lab05/frontend/build/test_cache/build/5ed1ec56e46357ec5ad2faed02821e03.cache.dill.track.dill differ
diff --git a/labs/lab05/frontend/build/unit_test_assets/AssetManifest.bin b/labs/lab05/frontend/build/unit_test_assets/AssetManifest.bin
new file mode 100644
index 000000000..86d111f09
Binary files /dev/null and b/labs/lab05/frontend/build/unit_test_assets/AssetManifest.bin differ
diff --git a/labs/lab05/frontend/build/unit_test_assets/AssetManifest.json b/labs/lab05/frontend/build/unit_test_assets/AssetManifest.json
new file mode 100644
index 000000000..9e26dfeeb
--- /dev/null
+++ b/labs/lab05/frontend/build/unit_test_assets/AssetManifest.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/labs/lab05/frontend/build/unit_test_assets/FontManifest.json b/labs/lab05/frontend/build/unit_test_assets/FontManifest.json
new file mode 100644
index 000000000..3abf18c41
--- /dev/null
+++ b/labs/lab05/frontend/build/unit_test_assets/FontManifest.json
@@ -0,0 +1 @@
+[{"family":"MaterialIcons","fonts":[{"asset":"fonts/MaterialIcons-Regular.otf"}]}]
\ No newline at end of file
diff --git a/labs/lab05/frontend/build/unit_test_assets/NOTICES.Z b/labs/lab05/frontend/build/unit_test_assets/NOTICES.Z
new file mode 100644
index 000000000..f7c204305
Binary files /dev/null and b/labs/lab05/frontend/build/unit_test_assets/NOTICES.Z differ
diff --git a/labs/lab05/frontend/build/unit_test_assets/NativeAssetsManifest.json b/labs/lab05/frontend/build/unit_test_assets/NativeAssetsManifest.json
new file mode 100644
index 000000000..523bfc7c6
--- /dev/null
+++ b/labs/lab05/frontend/build/unit_test_assets/NativeAssetsManifest.json
@@ -0,0 +1 @@
+{"format-version":[1,0,0],"native-assets":{}}
\ No newline at end of file
diff --git a/labs/lab05/frontend/build/unit_test_assets/fonts/MaterialIcons-Regular.otf b/labs/lab05/frontend/build/unit_test_assets/fonts/MaterialIcons-Regular.otf
new file mode 100644
index 000000000..8c9926613
Binary files /dev/null and b/labs/lab05/frontend/build/unit_test_assets/fonts/MaterialIcons-Regular.otf differ
diff --git a/labs/lab05/frontend/build/unit_test_assets/shaders/ink_sparkle.frag b/labs/lab05/frontend/build/unit_test_assets/shaders/ink_sparkle.frag
new file mode 100644
index 000000000..85fc35759
Binary files /dev/null and b/labs/lab05/frontend/build/unit_test_assets/shaders/ink_sparkle.frag differ
diff --git a/labs/lab05/frontend/lib/core/auth/auth_service.dart b/labs/lab05/frontend/lib/core/auth/auth_service.dart
index 891100815..61327b820 100644
--- a/labs/lab05/frontend/lib/core/auth/auth_service.dart
+++ b/labs/lab05/frontend/lib/core/auth/auth_service.dart
@@ -79,76 +79,96 @@ class AuthService {
   // Get current user
   User? get currentUser => _currentState.currentUser;
 
-  // TODO: Implement login method
-  // login authenticates a user with email and password
-  // Requirements:
-  // - Validate email and password using FormValidator.validateEmail() and FormValidator.validatePassword()
-  // - Return AuthResult.validationError if either validation fails
-  // - Sanitize email input using FormValidator.sanitizeText()
-  // - Use _userRepository.findByEmail() to get user
-  // - Return AuthResult.invalidCredentials if user not found
-  // - Use _userRepository.verifyPassword() to check password
-  // - Return AuthResult.invalidCredentials if password verification fails
-  // - Generate JWT token using _jwtService.generateToken() with user.id.toString() and user.email
-  // - Update _currentState with authenticated user, token, and current DateTime for loginTime
-  // - Return AuthResult.success on successful authentication
-  // - Return AuthResult.networkError if any exception occurs during the process
   Future<AuthResult> login(String email, String password) async {
-    // TODO: Implement this method
-    throw UnimplementedError('AuthService login not implemented');
+    try {
+      final validEmail = FormValidator.validateEmail(email);
+      final validPassword = FormValidator.validatePassword(password);
+      if (validEmail != null || validPassword != null) {
+        return AuthResult.validationError;
+      }
+
+      final cleanEmail = FormValidator.sanitizeText(email);
+
+      final user = await _userRepository.findByEmail(cleanEmail);
+      if (user == null) {
+        return AuthResult.invalidCredentials;
+      }
+
+      final rightPassword = await _userRepository.verifyPassword(email, password);
+      if (!rightPassword) {
+        return AuthResult.invalidCredentials;
+      }
+
+      final token = _jwtService.generateToken(user.id.toString(), user.email);
+
+      final currentTime = DateTime.now();
+      _currentState = _currentState.copyWith(
+        isAuthenticated: true,
+        currentUser: user,
+        token: token,
+        loginTime: currentTime,
+      );
+
+      return AuthResult.success;
+    } catch (error) {
+      return AuthResult.networkError;
+    }
   }
 
-  // TODO: Implement logout method
-  // logout clears the current authentication state
-  // Requirements:
-  // - Reset _currentState to a new empty AuthState()
-  // - This should clear isAuthenticated, currentUser, token, and loginTime
-  // - Method should complete without throwing exceptions
   Future<void> logout() async {
-    // TODO: Implement this method
-    throw UnimplementedError('AuthService logout not implemented');
+    _currentState = const AuthState();
   }
 
-  // TODO: Implement isSessionValid method
-  // isSessionValid checks if the current session is still valid
-  // Requirements:
-  // - Return false if not authenticated (!_currentState.isAuthenticated)
-  // - Return false if loginTime is null
-  // - Calculate time difference between current DateTime.now() and _currentState.loginTime
-  // - Return true if session duration is less than 24 hours
-  // - Return false if session has expired (24+ hours)
   bool isSessionValid() {
-    // TODO: Implement this method
-    throw UnimplementedError('AuthService isSessionValid not implemented');
+    if (!_currentState.isAuthenticated) {
+      return false;
+    }
+
+    final loginTime = _currentState.loginTime;
+    if (loginTime == null) {
+      return false;
+    }
+
+    final duration = DateTime.now().difference(loginTime);
+
+    return duration.inHours < 24;
   }
 
-  // TODO: Implement refreshAuth method
-  // refreshAuth validates and refreshes the current authentication status
-  // Requirements:
-  // - Call isSessionValid() to check session validity
-  // - If session is invalid, call logout() and return false
-  // - If token is present in _currentState.token, validate it using _jwtService.validateToken()
-  // - If token validation fails, call logout() and return false
-  // - Return true if session and token are valid
-  // - Handle any exceptions and return false if errors occur
   Future<bool> refreshAuth() async {
-    // TODO: Implement this method
-    throw UnimplementedError('AuthService refreshAuth not implemented');
+    try {
+      if (!isSessionValid()) {
+        await logout();
+        return false;
+      }
+
+      final token = _currentState.token;
+
+      if (token == null || !_jwtService.validateToken(token)) {
+        await logout();
+        return false;
+      }
+
+      return true;
+    } catch (exception) {
+      await logout();
+      return false;
+    }  
   }
 
-  // TODO: Implement getUserInfo method
-  // getUserInfo returns user information if authenticated
-  // Requirements:
-  // - Return null if not authenticated or currentUser is null
-  // - Return a Map<String, dynamic> containing:
-  //   - 'id': currentUser!.id
-  //   - 'name': currentUser!.name
-  //   - 'email': currentUser!.email
-  //   - 'loginTime': _currentState.loginTime?.toIso8601String() (convert to string or null)
-  //   - 'sessionValid': result of calling isSessionValid()
   Map<String, dynamic>? getUserInfo() {
-    // TODO: Implement this method
-    throw UnimplementedError('AuthService getUserInfo not implemented');
+    final user = _currentState.currentUser;
+
+    if (!_currentState.isAuthenticated || user == null) {
+      return null;
+    }
+
+    return {
+      'id': user!.id,
+      'name': user!.name,
+      'email': user!.email,
+      'loginTime': _currentState.loginTime?.toIso8601String(),
+      'sessionValid': isSessionValid()
+    };
   }
 }
 
diff --git a/labs/lab05/frontend/lib/core/validation/form_validator.dart b/labs/lab05/frontend/lib/core/validation/form_validator.dart
index 289c4bf8b..bf350dbd0 100644
--- a/labs/lab05/frontend/lib/core/validation/form_validator.dart
+++ b/labs/lab05/frontend/lib/core/validation/form_validator.dart
@@ -1,53 +1,65 @@
 // Simple form validation with basic security checks
 
 class FormValidator {
-  // TODO: Implement validateEmail method
-  // validateEmail checks if an email is valid
-  // Requirements:
-  // - return null for valid emails
-  // - return error message for invalid emails
-  // - check basic email format (contains @ and .)
-  // - check reasonable length (max 100 characters)
   static String? validateEmail(String? email) {
-    // TODO: Implement email validation
-    // Check for null/empty, basic format, and length
-    throw UnimplementedError('FormValidator validateEmail not implemented');
+    final cleanEmail = sanitizeText(email);
+
+    if (cleanEmail == null || cleanEmail == "") {
+      return "Email required";
+    }
+
+    final emailRegex = RegExp(
+      r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$',);
+    if (!emailRegex.hasMatch(cleanEmail)) {
+      return "Email format is invalid";
+    }
+
+    if (cleanEmail.length > 100) {
+      return "Email is too long";
+    }
+
+    return null;
   }
 
-  // TODO: Implement validatePassword method
-  // validatePassword checks if a password meets basic requirements
-  // Requirements:
-  // - return null for valid passwords
-  // - return error message for invalid passwords
-  // - minimum 6 characters
-  // - contains at least one letter and one number
   static String? validatePassword(String? password) {
-    // TODO: Implement password validation
-    // Check length and basic complexity
-    throw UnimplementedError('FormValidator validatePassword not implemented');
+    if (password == null || password.isEmpty) {
+      return "Password required";
+    }
+
+    if (password.length < 6) {
+      return "Password must be at least 6 characters long";
+    }
+
+    final lettersRegex = RegExp(r'[A-Za-z]');
+    final numbersRegex = RegExp(r'[0-9]');
+    if (!lettersRegex.hasMatch(password!) || 
+      !numbersRegex.hasMatch(password!)) {
+        return "Password must contain at least one letter and number";
+    }
+
+    return null;
   }
 
-  // TODO: Implement sanitizeText method
-  // sanitizeText removes basic dangerous characters
-  // Requirements:
-  // - remove < and > characters
-  // - trim whitespace
-  // - return cleaned text
   static String sanitizeText(String? text) {
-    // TODO: Implement text sanitization
-    // Clean basic dangerous characters
-    throw UnimplementedError('FormValidator sanitizeText not implemented');
+    if (text == null) {
+      return '';
+    }
+
+    final trimmedText = text.trim();
+    final cleanText = trimmedText.replaceAll(RegExp(r'<[^>]*>'), '');
+    return cleanText;
   }
 
-  // TODO: Implement isValidLength method
-  // isValidLength checks if text is within length limits
-  // Requirements:
-  // - return true if text length is between min and max
-  // - handle null text gracefully
   static bool isValidLength(String? text,
       {int minLength = 1, int maxLength = 100}) {
-    // TODO: Implement length validation
-    // Check text length bounds
-    throw UnimplementedError('FormValidator isValidLength not implemented');
+    if (text == null) {
+      return false;
+    }
+
+    if (text.length < minLength || text.length > maxLength) {
+      return false;
+    }
+
+    return true;
   }
 }