diff --git a/package.json b/package.json
new file mode 100644
index 0000000000..11eff3bfa3
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+ "name": "code-challenge",
+ "version": "1.0.0",
+ "description": "Note that if you fork this repository, your responses may be publicly linked to this repo. Please submit your application along with the solutions attached or linked.",
+ "homepage": "https://github.com/thphucle/code-challenge#readme",
+ "bugs": {
+ "url": "https://github.com/thphucle/code-challenge/issues"
+ },
+ "repository": {
+ "type": "git",
+ "url": "git+https://github.com/thphucle/code-challenge.git"
+ },
+ "license": "ISC",
+ "author": "",
+ "type": "commonjs",
+ "main": "index.js",
+ "scripts": {
+ "test": "echo \"Error: no test specified\" && exit 1"
+ }
+}
diff --git a/readme.md b/readme.md
index 1ff4bc95b4..2f34808113 100644
--- a/readme.md
+++ b/readme.md
@@ -1,10 +1,73 @@
# 99Tech Code Challenge #1 #
-Note that if you fork this repository, your responses may be publicly linked to this repo.
-Please submit your application along with the solutions attached or linked.
+# Problem 4: Three Ways to Sum to n
-It is important that you minimally attempt the problems, even if you do not arrive at a working solution.
+**Location**: `src/problem4/`
-## Submission ##
-You can either provide a link to an online repository, attach the solution in your application, or whichever method you prefer.
-We're cool as long as we can view your solution without any pain.
+This problem implements three unique approaches to calculate the summation of integers from 1 to n:
+
+- **Implementation A**: Recursive approach
+- **Implementation B**: Iterative/Loop approach
+- **Implementation C**: Mathematical formula approach
+
+---
+
+# Problem 5: A Crude Server
+
+**Location**: `src/problem5/`
+
+An Express backend with TypeScript providing RESTful CRUD operations for resource management using SQLite.
+
+**Features**:
+
+- CRUD operations (Create, Read, Update, Delete)
+- Full TypeScript type safety
+- SQLite database for persistence
+- Filtering & search capabilities
+- Pagination support (limit and offset)
+- Comprehensive error handling
+- CORS support
+
+**Project Structure**:
+
+```
+src/
+├── server.ts # Main Express server entry point
+├── controllers/ # Business logic for CRUD operations
+├── database/ # SQLite database configuration
+├── middlewares/ # Error handling middleware
+├── repositories/ # SQL command execution layer
+├── routes/ # API route definitions
+└── types/ # TypeScript type definitions
+```
+
+**How to run**:
+
+1. Navigate to `src/problem5/`
+2. Install dependencies: `npm install`
+3. Configure environment variables (see README.md for details)
+4. Build TypeScript: `npm run build` (if applicable)
+5. Start the server: `npm start`
+6. Test API endpoints with your preferred HTTP client (Postman, curl, etc.)
+
+**API Endpoints**:
+
+- `GET /resource` - Get all resources with optional filtering and pagination
+- `POST /resource` - Create a new resource
+- `GET /resource/:id` - Get a specific resource
+- `PUT /resource/:id` - Update a resource
+- `DELETE /resource/:id` - Delete a resource
+
+---
+
+# Problem 6: Scoreboard API Service - Architecture
+
+**Location**: `src/problem6/`
+
+A specification about backend service designed to manage user scores and provide real-time leaderboard updates using Redis and PostgreSQL.
+
+**Core Components**:
+
+- `LeaderboardService.ts` - Manages leaderboard operations
+- `RedisClient.ts` - Redis connection
+- `README.md` - The final specification
diff --git a/src/problem2/index.html b/src/problem2/index.html
deleted file mode 100644
index 4058a68bff..0000000000
--- a/src/problem2/index.html
+++ /dev/null
@@ -1,27 +0,0 @@
-
-
-
-
- Fancy Form
-
-
-
-
-
-
-
-
-
-
-
-
-
diff --git a/src/problem2/script.js b/src/problem2/script.js
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/src/problem2/style.css b/src/problem2/style.css
deleted file mode 100644
index 915af91c72..0000000000
--- a/src/problem2/style.css
+++ /dev/null
@@ -1,8 +0,0 @@
-body {
- display: flex;
- flex-direction: row;
- align-items: center;
- justify-content: center;
- min-width: 360px;
- font-family: Arial, Helvetica, sans-serif;
-}
diff --git a/src/problem3/.keep b/src/problem3/.keep
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/src/problem4/README.md b/src/problem4/README.md
new file mode 100644
index 0000000000..f149d43bf0
--- /dev/null
+++ b/src/problem4/README.md
@@ -0,0 +1,123 @@
+# Problem 4: Three Ways to Sum to n
+
+## Problem Description
+
+Provide 3 unique implementations of a function that calculates the summation of all integers from 1 to n.
+
+### Specifications
+
+- **Input**: `n` - any integer
+- **Output**: summation to n (e.g., `sum_to_n(5) === 1 + 2 + 3 + 4 + 5 === 15`)
+- **Assumptions**:
+ - Result will always be less than `Number.MAX_SAFE_INTEGER`
+ - Negative integers should return 0
+ - Non-integer inputs should be truncated to the nearest lower integer
+
+---
+
+## Implementation A: Recursion
+
+```typescript
+function sum_to_n_a(n: number): number {
+ if (n < 0)
+ return 0;
+
+ n = Math.trunc(n);
+
+ if (n <= 1)
+ return n;
+ else
+ return n + sum_to_n_a(n - 1);
+}
+```
+
+### Complexity Analysis
+
+| Metric | Value |
+|-------- |-------|
+| **Time Complexity** | O(n) |
+| **Space Complexity** | O(n) |
+
+### Efficiency Comment
+
+Least efficient due to function call overhead and risk of stack overflow for large n values. However, it is elegant and easy to understand. Not recommended for production use with large inputs.
+
+---
+
+## Implementation B: Loop (Iterative)
+
+```typescript
+function sum_to_n_b(n: number): number {
+ if (n < 0)
+ return 0;
+
+ n = Math.trunc(n);
+
+ let sum: number = 0;
+
+ for (let i = 1; i <= n; i++)
+ sum += i;
+
+ return sum;
+}
+```
+
+### Complexity Analysis
+
+| Metric | Value |
+|-------- |-------|
+| **Time Complexity** | O(n) |
+| **Space Complexity** | O(1) |
+
+### Efficiency Comment
+
+More efficient than recursion. No stack overflow risk. Provides a good balance between readability and performance for moderate values of n. Suitable for general use cases.
+
+---
+
+## Implementation C: Mathematical Formula
+
+```typescript
+function sum_to_n_c(n: number): number {
+ if (n < 0)
+ return 0;
+
+ n = Math.trunc(n);
+
+ return (n * (n + 1)) / 2;
+}
+```
+
+### Complexity Analysis
+
+| Metric | Value |
+|-------- |-------|
+| **Time Complexity** | O(1) |
+| **Space Complexity** | O(1) |
+
+### Efficiency Comment
+
+**Most efficient**. Uses the mathematical formula for arithmetic series: n(n+1)/2. Delivers instant results regardless of input size with no loops or recursion. Recommended for production use.
+
+---
+
+## Summary Comparison
+
+| Method | Time | Space | Best For |
+|-------- |------|------- |---------- |
+| **Recursion** | O(n) | O(n) | Educational purposes, small n values |
+| **Loop** | O(n) | O(1) | Balanced approach, moderate n values |
+| **Formula** | O(1) | O(1) | **Production code, optimal solution** |
+
+---
+
+## Example Usage
+
+```typescript
+console.log(sum_to_n_a(5)); // Output: 15
+console.log(sum_to_n_b(5)); // Output: 15
+console.log(sum_to_n_c(5)); // Output: 15
+
+console.log(sum_to_n_a(-3)); // Output: 0
+console.log(sum_to_n_b(3.7)); // Output: 6 (truncates to 3)
+```
diff --git a/src/problem5/.gitignore b/src/problem5/.gitignore
new file mode 100644
index 0000000000..419f8b3e29
--- /dev/null
+++ b/src/problem5/.gitignore
@@ -0,0 +1,6 @@
+node_modules/
+dist/
+*.log
+.env
+.DS_Store
+resources.db
diff --git a/src/problem5/README.md b/src/problem5/README.md
new file mode 100644
index 0000000000..527c958a95
--- /dev/null
+++ b/src/problem5/README.md
@@ -0,0 +1,409 @@
+# Express CRUD Backend Server
+
+A Express backend with TypeScript that provides RESTful CRUD operations for resource management.
+The server uses SQLite for data persistence.
+
+## Features
+
+- **CRUD Operations**: Create, Read, Update, Delete resources
+- **TypeScript**: Full type safety with TypeScript
+- **SQLite Database**: Persistent data storage
+- **Filtering & Search**: Filter resources by category, status, and search by name/description
+- **Pagination**: Limit and offset support for listing resources
+- **Error Handling**: Comprehensive error handling and validation
+- **CORS Support**: Cross-Origin Resource Sharing enabled
+- **RESTful API**: Standard REST conventions
+
+## Project Structure
+
+``` graph
+problem5/
+├── src/
+│ ├── server.ts # Main Express server
+│ ├── controllers/
+│ │ └── resourceController.ts # CRUD operations logic
+│ ├── database/
+│ │ └── index.ts # SQLite database configuration
+│ ├── middlewares/
+│ │ └── errorHandler.ts # Error handling middleware
+│ ├── repositories/
+│ │ └── resourceRepository.ts # Repositories to run sql command
+│ ├── routes/
+│ │ └── resourceRoutes.ts # API route definitions
+│ └── types/
+│ └── index.ts # TypeScript type definitions
+├── package.json
+├── tsconfig.json
+├── .gitignore
+└── README.md
+```
+
+## Prerequisites
+
+- Node.js (v14 or higher)
+- npm or yarn
+
+## Configuration
+
+Set environment variables by creating a `.env` file or exporting them before running the server.
+
+The server uses environment variables for configuration:
+
+- `PORT`: Server port (default: `3000`)
+
+## Installation
+
+1. Navigate to the problem5 folder:
+
+ ```bash
+ cd src/problem5
+ ```
+
+2. Install dependencies:
+
+ ```bash
+ npm install
+ ```
+
+## Building & Running
+
+### Development Mode
+
+Start the server with hot-reload using ts-node:
+
+```bash
+npm run dev
+```
+
+This will start the server at `http://localhost:3000`.
+
+### Production Mode
+
+First, build the TypeScript to JavaScript:
+
+```bash
+npm run build
+```
+
+Then start the compiled server:
+
+```bash
+npm start
+```
+
+## API Endpoints
+
+### Base URL
+
+```url
+http://localhost:3000/api/resource
+```
+
+### 1. Create a Resource
+
+**Endpoint**: `POST /api/resource`
+
+**Request Body**:
+
+```json
+{
+ "name": "Resource Name",
+ "description": "Resource Description",
+ "category": "Category Name",
+ "status": "active"
+}
+```
+
+**Response** (201 Created):
+
+```json
+{
+ "success": true,
+ "data": {
+ "data": {
+ "id": 1,
+ "name": "Resource Name",
+ "description": "Resource Description",
+ "category": "Category Name",
+ "status": "active",
+ "createdAt": "2024-05-28T10:00:00.000Z",
+ "updatedAt": "2024-05-28T10:00:00.000Z"
+ }
+ },
+ "message": "Resource created successfully"
+}
+```
+
+### 2. List Resources with Filters
+
+**Endpoint**: `GET /api/resource`
+
+**Query Parameters**:
+
+- `category` (optional): Filter by category
+- `status` (optional): Filter by status (`active` or `inactive`)
+- `search` (optional): Search in name and description
+- `limit` (optional, default: 10): Number of results per page
+- `offset` (optional, default: 0): Pagination offset
+
+**Example**:
+
+```url
+GET /api/resource?category=electronics&status=active&search=laptop&limit=20&offset=0
+```
+
+**Response** (200 OK):
+
+```json
+{
+ "success": true,
+ "data": {
+ "total": 1,
+ "data": [
+ {
+ "id": 1,
+ "name": "Laptop",
+ "description": "High-performance laptop",
+ "category": "electronics",
+ "status": "active",
+ "createdAt": "2024-05-28T10:00:00.000Z",
+ "updatedAt": "2024-05-28T10:00:00.000Z"
+ }
+ ]
+ }
+ "message": "Retrieved 1 resources"
+}
+```
+
+### 3. Get Resource Details
+
+**Endpoint**: `GET /api/resource/:id`
+
+**Response** (200 OK):
+
+```json
+{
+ "success": true,
+ "data": {
+ "data": {
+ "id": 1,
+ "name": "Resource Name",
+ "description": "Resource Description",
+ "category": "Category Name",
+ "status": "active",
+ "createdAt": "2024-05-28T10:00:00.000Z",
+ "updatedAt": "2024-05-28T10:00:00.000Z"
+ }
+ },
+ "message": "Resource retrieved successfully"
+}
+```
+
+**Error Response** (404 Not Found):
+
+```json
+{
+ "success": false,
+ "error": "Resource not found"
+}
+```
+
+### 4. Update Resource
+
+**Endpoint**: `PUT /api/resource/:id`
+
+**Request Body** (all fields optional):
+
+```json
+{
+ "name": "Updated Name",
+ "description": "Updated Description",
+ "category": "Updated Category",
+ "status": "inactive"
+}
+```
+
+**Response** (200 OK):
+
+```json
+{
+ "success": true,
+ "data": {
+ "data": {
+ "id": 1,
+ "name": "Updated Name",
+ "description": "Updated Description",
+ "category": "Updated Category",
+ "status": "inactive",
+ "createdAt": "2024-05-28T10:00:00.000Z",
+ "updatedAt": "2024-05-28T10:30:00.000Z"
+ }
+ },
+ "message": "Resource updated successfully"
+}
+```
+
+### 5. Delete Resource
+
+**Endpoint**: `DELETE /api/resource/:id`
+
+**Response** (200 OK):
+
+```json
+{
+ "success": true,
+ "message": "Resource deleted successfully"
+}
+```
+
+**Error Response** (404 Not Found):
+
+```json
+{
+ "success": false,
+ "error": "Resource not found"
+}
+```
+
+### Health Check
+
+**Endpoint**: `GET /health`
+
+**Response** (200 OK):
+
+```json
+{
+ "success": true,
+ "message": "Server is running",
+ "timestamp": "2024-05-28T10:00:00.000Z"
+}
+```
+
+## Testing the API
+
+### Using cURL
+
+**Create a resource**:
+
+```bash
+curl -X POST http://localhost:3000/api/resource \
+ -H "Content-Type: application/json" \
+ -d '{
+ "name": "Laptop",
+ "description": "High-performance laptop",
+ "category": "electronics",
+ "status": "active"
+ }'
+```
+
+**List all resources**:
+
+```bash
+curl http://localhost:3000/api/resource
+```
+
+**Filter resources by category**:
+
+```bash
+curl "http://localhost:3000/api/resource?category=electronics"
+```
+
+**Search resources**:
+
+```bash
+curl "http://localhost:3000/api/resource?search=laptop"
+```
+
+**Get a specific resource**:
+
+```bash
+curl http://localhost:3000/api/resource/1
+```
+
+**Update a resource**:
+
+```bash
+curl -X PUT http://localhost:3000/api/resource/1 \
+ -H "Content-Type: application/json" \
+ -d '{
+ "status": "inactive"
+ }'
+```
+
+**Delete a resource**:
+
+```bash
+curl -X DELETE http://localhost:3000/api/resource/1
+```
+
+### Using Postman
+
+#### Create a Postman collection by below steps
+
+1. Import the endpoints listed above into Postman
+2. Set the request type (GET, POST, PUT, DELETE)
+3. Add appropriate headers (Content-Type: application/json for POST/PUT)
+4. Add request body where needed
+5. Send the request and view the response
+
+#### Import from my example Postman collection
+
+```url
+https://speeding-trinity-9694.postman.co/workspace/My-Workspace~8a74d211-49df-43f3-808f-d866d7ad7556/folder/4360852-a4714a13-ed3d-4766-b44e-236f481dcd92?action=share&creator=4360852&ctx=documentation&active-environment=4360852-c5ccdcc2-640a-4d8f-a662-0640f14b1e60
+```
+
+## Error Handling
+
+The API returns appropriate HTTP status codes:
+
+- `200 OK`: Successful GET, PUT, DELETE
+- `201 Created`: Successful POST
+- `400 Bad Request`: Invalid input or missing required fields
+- `404 Not Found`: Resource doesn't exist
+- `500 Internal Server Error`: Server error
+
+All error responses follow this format, includes error code above:
+
+```json
+{
+ "success": false,
+ "error": "Error message describing the issue"
+}
+```
+
+## Database
+
+The server uses SQLite with the following schema:
+
+**resources table**:
+
+```sql
+CREATE TABLE resources (
+ id INTEGER PRIMARY KEY AUTOINCREMENT,
+ name TEXT NOT NULL,
+ description TEXT,
+ category TEXT,
+ status TEXT DEFAULT 'active',
+ createdAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+ updatedAt DATETIME DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+The database file (`resources.db`) is automatically created on the first run in the project root.
+
+## Troubleshooting
+
+### Port already in use
+
+If port 3000 is already in use, set a different PORT:
+
+```bash
+PORT=3001 npm run dev
+```
+
+### Database locked
+
+If you get a database locked error:
+
+1. Ensure only one server instance is running
+2. Delete `resources.db` and restart (this will clear all data)
diff --git a/src/problem5/package-lock.json b/src/problem5/package-lock.json
new file mode 100644
index 0000000000..2d73e7f446
--- /dev/null
+++ b/src/problem5/package-lock.json
@@ -0,0 +1,2683 @@
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+ "cors": "^2.8.5",
+ "express": "^4.18.2",
+ "sqlite3": "^5.1.6"
+ },
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+ "@types/express": "^4.17.17",
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+ }
+ },
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+ "license": "MIT",
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+ "rimraf": "^3.0.2"
+ },
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+ }
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+ "node_modules/@tootallnate/once": {
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+ "optional": true,
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+ }
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+ "optional": true,
+ "dependencies": {
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+ }
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+ "license": "MIT",
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+ "license": "ISC",
+ "optional": true,
+ "dependencies": {
+ "isexe": "^2.0.0"
+ },
+ "bin": {
+ "node-which": "bin/node-which"
+ },
+ "engines": {
+ "node": ">= 8"
+ }
+ },
+ "node_modules/wide-align": {
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+ "license": "ISC",
+ "optional": true,
+ "dependencies": {
+ "string-width": "^1.0.2 || 2 || 3 || 4"
+ }
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+ "license": "ISC"
+ },
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+ "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+ "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+ "license": "ISC"
+ },
+ "node_modules/yn": {
+ "version": "3.1.1",
+ "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+ "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=6"
+ }
+ }
+ }
+}
diff --git a/src/problem5/package.json b/src/problem5/package.json
new file mode 100644
index 0000000000..10a9715d5f
--- /dev/null
+++ b/src/problem5/package.json
@@ -0,0 +1,29 @@
+{
+ "name": "problem5",
+ "version": "1.0.0",
+ "description": "Express backend with CRUD operations using TypeScript",
+ "main": "dist/server.js",
+ "scripts": {
+ "start": "node dist/server.js",
+ "dev": "ts-node src/server.ts",
+ "build": "tsc",
+ "clean": "rm -rf dist"
+ },
+ "keywords": ["express", "crud", "typescript"],
+ "author": "",
+ "license": "ISC",
+ "dependencies": {
+ "express": "^4.18.2",
+ "sqlite3": "^5.1.6",
+ "cors": "^2.8.5",
+ "body-parser": "^1.20.2"
+ },
+ "devDependencies": {
+ "@types/express": "^4.17.17",
+ "@types/node": "^20.3.1",
+ "@types/cors": "^2.8.13",
+ "typescript": "^5.1.3",
+ "ts-node": "^10.9.1",
+ "@types/sqlite3": "^3.1.8"
+ }
+}
diff --git a/src/problem5/src/controllers/resourceController.ts b/src/problem5/src/controllers/resourceController.ts
new file mode 100644
index 0000000000..390845e974
--- /dev/null
+++ b/src/problem5/src/controllers/resourceController.ts
@@ -0,0 +1,236 @@
+import { Request, Response } from 'express';
+import * as resourceRepository from '../repositories/resourceRepository';
+import { Resource, CreateResourceRequest, UpdateResourceRequest, ResourceFilter, ApiResponse } from '../types';
+
+// Create
+export async function createResource(req: Request, res: Response): Promise {
+ try {
+ const { name, description, category, status = 'active' } = req.body as CreateResourceRequest;
+
+ if (!name || !name.trim()) {
+ res.status(400).json({
+ success: false,
+ error: 'Name is required and cannot be empty',
+ } as ApiResponse);
+ return;
+ }
+ const result = await resourceRepository.createResource(name.trim(), description || '', category || '', status);
+
+ const resource = await resourceRepository.getResourceById(result.id);
+
+ res.status(201).json({
+ success: true,
+ data: { data: resource },
+ message: 'Resource created successfully',
+ } as ApiResponse);
+ } catch (error) {
+ console.error('Error creating resource:', error);
+ res.status(500).json({
+ success: false,
+ error: 'Internal server error',
+ } as ApiResponse);
+ }
+}
+
+// List
+export async function listResources(req: Request, res: Response): Promise {
+ try {
+ const { query, params, limit, offset } = prepareQueryParam(req);
+ const { data: resources, total } = await resourceRepository.listResources(query, params, limit, offset);
+
+ res.json({
+ success: true,
+ data: {
+ total,
+ data: resources,
+ },
+ message: `Retrieved ${resources.length} resources`,
+ } as ApiResponse);
+ } catch (error) {
+ console.error('Error listing resources:', error);
+ res.status(500).json({
+ success: false,
+ error: 'Internal server error',
+ } as ApiResponse);
+ }
+}
+
+// Get by ID
+export async function getResource(req: Request, res: Response): Promise {
+ try {
+ const { id } = req.params;
+
+ const numId = parseInt(id, 10);
+ if (isNaN(numId)) {
+ res.status(400).json({
+ success: false,
+ error: 'Invalid resource ID',
+ } as ApiResponse);
+ return;
+ }
+
+ const resource = await resourceRepository.getResourceById(numId);
+ if (!resource) {
+ res.status(404).json({
+ success: false,
+ error: 'Resource not found',
+ } as ApiResponse);
+ return;
+ }
+
+ res.json({
+ success: true,
+ data: { data: resource },
+ message: 'Resource retrieved successfully',
+ } as ApiResponse);
+ } catch (error) {
+ console.error('Error getting resource:', error);
+ res.status(500).json({
+ success: false,
+ error: 'Internal server error',
+ } as ApiResponse);
+ }
+}
+
+// Update
+export async function updateResource(req: Request, res: Response): Promise {
+ try {
+ const { id } = req.params;
+ const updates = req.body as UpdateResourceRequest;
+ const { numId, success, error, errorCode } = await validateResource(id);
+
+ if (!success) {
+ res.status(errorCode || 500).json({
+ success: false,
+ error: error || 'Internal server error',
+ } as ApiResponse);
+ return;
+ }
+
+ // Dynamic update query
+ const fields: string[] = [];
+ const params: any[] = [];
+
+ if (updates.name !== undefined) {
+ if (!updates.name.trim()) {
+ res.status(400).json({
+ success: false,
+ error: 'Name cannot be empty',
+ } as ApiResponse);
+ return;
+ }
+ fields.push('name = ?');
+ params.push(updates.name.trim());
+ }
+
+ if (updates.description !== undefined) {
+ fields.push('description = ?');
+ params.push(updates.description);
+ }
+
+ if (updates.category !== undefined) {
+ fields.push('category = ?');
+ params.push(updates.category);
+ }
+
+ if (updates.status !== undefined) {
+ fields.push('status = ?');
+ params.push(updates.status);
+ }
+
+ if (fields.length === 0) {
+ res.status(400).json({
+ success: false,
+ error: 'No fields to update',
+ } as ApiResponse);
+ return;
+ }
+
+ fields.push('updatedAt = CURRENT_TIMESTAMP');
+
+ await resourceRepository.updateResource(numId, { fields, params });
+
+ const updated_resource = await resourceRepository.getResourceById(numId);
+
+ res.json({
+ success: true,
+ data: { data: updated_resource },
+ message: 'Resource updated successfully',
+ } as ApiResponse);
+ } catch (error) {
+ console.error('Error updating resource:', error);
+ res.status(500).json({
+ success: false,
+ error: 'Internal server error',
+ } as ApiResponse);
+ }
+}
+
+// Delete
+export async function deleteResource(req: Request, res: Response): Promise {
+ try {
+ const { id } = req.params;
+ const { numId, success, error, errorCode } = await validateResource(id);
+ if (!success) {
+ res.status(errorCode || 500).json({
+ success: false,
+ error: error || 'Internal server error',
+ } as ApiResponse);
+ return;
+ }
+
+ await resourceRepository.deleteResource(numId);
+
+ res.json({
+ success: true,
+ message: 'Resource deleted successfully',
+ } as ApiResponse);
+ } catch (error) {
+ console.error('Error deleting resource:', error);
+ res.status(500).json({
+ success: false,
+ error: 'Internal server error',
+ } as ApiResponse);
+ }
+}
+
+// Prepare query parameters
+function prepareQueryParam(req: Request) {
+ const { category, status, search, limit = 10, offset = 0 } = req.query as ResourceFilter;
+
+ let query = 'SELECT * FROM resources WHERE 1=1';
+ const params: any[] = [];
+
+ if (category) {
+ query += ' AND category = ?';
+ params.push(category);
+ }
+
+ if (status) {
+ query += ' AND status = ?';
+ params.push(status);
+ }
+
+ if (search) {
+ query += ' AND (name LIKE ? OR description LIKE ?)';
+ const search_term = `%${search}%`;
+ params.push(search_term, search_term);
+ }
+
+ return { query, params, limit, offset };
+}
+
+// Validate resource existence
+async function validateResource(id: string): Promise<{ numId: number; success: boolean; error?: string, errorCode?: number }> {
+ const numId = parseInt(id, 10);
+ if (isNaN(numId)) {
+ return { numId: NaN, success: false, error: 'Invalid resource ID', errorCode: 400 };
+ }
+
+ const existing = await resourceRepository.getResourceById(numId);
+ if (!existing) {
+ return { numId, success: false, error: 'Resource not found', errorCode: 404 };
+ }
+
+ return { numId, success: true };
+}
\ No newline at end of file
diff --git a/src/problem5/src/database/index.ts b/src/problem5/src/database/index.ts
new file mode 100644
index 0000000000..70600aa783
--- /dev/null
+++ b/src/problem5/src/database/index.ts
@@ -0,0 +1,102 @@
+import sqlite3 from 'sqlite3';
+import path from 'path';
+
+const DB_PATH = path.join(__dirname, '../../resources.db');
+
+let db: sqlite3.Database;
+
+export function initializeDatabase(): Promise {
+ return new Promise((resolve, reject) => {
+ db = new sqlite3.Database(DB_PATH, (err) => {
+ if (err) {
+ reject(err);
+ }
+ console.log('Connected to SQLite database');
+ createTables()
+ .then(() => resolve())
+ .catch(reject);
+ });
+ });
+}
+
+function createTables(): Promise {
+ return new Promise((resolve, reject) => {
+ db.serialize(() => {
+ db.run(`
+ CREATE TABLE IF NOT EXISTS resources (
+ id INTEGER PRIMARY KEY AUTOINCREMENT,
+ name TEXT NOT NULL,
+ description TEXT,
+ category TEXT,
+ status TEXT DEFAULT 'active',
+ createdAt DATETIME DEFAULT CURRENT_TIMESTAMP,
+ updatedAt DATETIME DEFAULT CURRENT_TIMESTAMP
+ );
+ `,
+ function (err){
+ if (err) {
+ reject(err);
+ }
+ console.log('Resources table created or already exists');
+ resolve();
+ }
+ );
+ });
+ });
+}
+
+export function getDatabase(): sqlite3.Database {
+ if (!db) {
+ throw new Error('Database not initialized. Call initializeDatabase() first.');
+ }
+ return db;
+}
+
+export function run(sql: string, params: any[] = []): Promise<{ id: number; changes: number }> {
+ return new Promise((resolve, reject) => {
+ db.run(sql, params, function (err) {
+ if (err) {
+ reject(err);
+ }
+ resolve({ id: this.lastID, changes: this.changes });
+ });
+ });
+}
+
+export function get(sql: string, params: any[] = []): Promise {
+ return new Promise((resolve, reject) => {
+ db.get(sql, params, (err, row) => {
+ if (err) {
+ reject(err);
+ }
+ resolve(row);
+ });
+ });
+}
+
+export function all(sql: string, params: any[] = []): Promise {
+ return new Promise((resolve, reject) => {
+ db.all(sql, params, (err, rows) => {
+ if (err) {
+ reject(err);
+ }
+ resolve(rows || []);
+ });
+ });
+}
+
+export function closeDatabase(): Promise {
+ return new Promise((resolve, reject) => {
+ if (db) {
+ db.close((err) => {
+ if (err) {
+ reject(err);
+ }
+ console.log('Database connection closed');
+ resolve();
+ });
+ } else {
+ resolve();
+ }
+ });
+}
diff --git a/src/problem5/src/middlewares/errorHandler.ts b/src/problem5/src/middlewares/errorHandler.ts
new file mode 100644
index 0000000000..bc20d9cee8
--- /dev/null
+++ b/src/problem5/src/middlewares/errorHandler.ts
@@ -0,0 +1,20 @@
+import { Request, Response, NextFunction } from 'express';
+
+export function errorHandler(err: any, req: Request, res: Response, next: NextFunction): void {
+ console.error('Error:', err);
+
+ const statusCode = err.statusCode || 500;
+ const message = err.message || 'Internal server error';
+
+ res.status(statusCode).json({
+ success: false,
+ error: message,
+ });
+}
+
+export function notFoundHandler(req: Request, res: Response): void {
+ res.status(404).json({
+ success: false,
+ error: 'Route not found',
+ });
+}
diff --git a/src/problem5/src/repositories/resourceRepository.ts b/src/problem5/src/repositories/resourceRepository.ts
new file mode 100644
index 0000000000..794d424353
--- /dev/null
+++ b/src/problem5/src/repositories/resourceRepository.ts
@@ -0,0 +1,43 @@
+import * as db from '../database';
+import { Resource } from '../types';
+
+export async function createResource(name: string, description?: string, category?: string, status?: string): Promise<{ id: number }> {
+ const result = await db.run(`
+ INSERT INTO resources (name, description, category, status)
+ VALUES (?, ?, ?, ?);
+ `,
+ [name, description, category, status]
+ );
+ return { id: result.id };
+}
+
+export async function listResources(query: string, params: any[], limit: number, offset: number): Promise<{ data: Resource[]; total: number }> {
+ const count_result = await db.get(
+ query.replace('SELECT *', 'SELECT COUNT(*) as count'),
+ params
+ );
+ const total = count_result?.count || 0;
+
+ query += ' ORDER BY createdAt DESC LIMIT ? OFFSET ?';
+
+ params.push(limit, offset);
+
+ const data = await db.all(query, params);
+
+ return { data, total };
+}
+
+export async function getResourceById(id: number): Promise {
+ const resource = await db.get('SELECT * FROM resources WHERE id = ?', [id]);
+ return resource;
+}
+
+export async function updateResource(id: number, updates: { fields: string[], params: any[] }): Promise {
+ updates.params.push(id);
+ const query = `UPDATE resources SET ${updates.fields.join(', ')} WHERE id = ?`;
+ await db.run(query, updates.params);
+}
+
+export async function deleteResource(id: number): Promise {
+ await db.run('DELETE FROM resources WHERE id = ?', [id]);
+}
diff --git a/src/problem5/src/routes/resourceRoutes.ts b/src/problem5/src/routes/resourceRoutes.ts
new file mode 100644
index 0000000000..a28b3a8d7d
--- /dev/null
+++ b/src/problem5/src/routes/resourceRoutes.ts
@@ -0,0 +1,13 @@
+import { Router } from 'express';
+import * as resourceController from '../controllers/resourceController';
+
+const router = Router();
+
+// CRUD Routes
+router.post('/', resourceController.createResource);
+router.get('/', resourceController.listResources);
+router.get('/:id', resourceController.getResource);
+router.put('/:id', resourceController.updateResource);
+router.delete('/:id', resourceController.deleteResource);
+
+export default router;
diff --git a/src/problem5/src/server.ts b/src/problem5/src/server.ts
new file mode 100644
index 0000000000..41e5d0b9f2
--- /dev/null
+++ b/src/problem5/src/server.ts
@@ -0,0 +1,59 @@
+import express, { Request, Response, NextFunction } from 'express';
+import cors from 'cors';
+import bodyParser from 'body-parser';
+import * as database from './database';
+import resourceRoutes from './routes/resourceRoutes';
+import { errorHandler, notFoundHandler } from './middlewares/errorHandler';
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// Middleware
+app.use(cors());
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+app.use((req: Request, res: Response, next: NextFunction) => {
+ console.log(`${new Date().toISOString()} - ${req.method} ${req.path}`);
+ next();
+});
+
+// Health check
+app.get('/health', (req: Request, res: Response) => {
+ res.json({
+ success: true,
+ message: 'Server is running',
+ timestamp: new Date().toISOString(),
+ });
+});
+
+// Routes
+app.use('/api/resource', resourceRoutes);
+
+// Error handler
+app.use(notFoundHandler);
+app.use(errorHandler);
+
+// Start server
+async function startServer(): Promise {
+ try {
+ await database.initializeDatabase();
+ console.log('Database initialized successfully');
+
+ app.listen(PORT, () => {
+ console.log(`Server is running on http://localhost:${PORT}`);
+ console.log(`Health check: http://localhost:${PORT}/health`);
+ console.log(`API base: http://localhost:${PORT}/api/resource`);
+ });
+ } catch (error) {
+ console.error('Failed to start server:', error);
+ process.exit(1);
+ }
+}
+
+process.on('SIGINT', async () => {
+ console.log('Shutting down gracefully...');
+ await database.closeDatabase();
+ process.exit(0);
+});
+
+startServer();
diff --git a/src/problem5/src/types/index.ts b/src/problem5/src/types/index.ts
new file mode 100644
index 0000000000..933ed88397
--- /dev/null
+++ b/src/problem5/src/types/index.ts
@@ -0,0 +1,41 @@
+export interface Resource {
+ id: number;
+ name: string;
+ description: string;
+ category: string;
+ status: 'active' | 'inactive';
+ createdAt: string;
+ updatedAt: string;
+}
+
+export interface CreateResourceRequest {
+ name: string;
+ description: string;
+ category: string;
+ status?: 'active' | 'inactive';
+}
+
+export interface UpdateResourceRequest {
+ name?: string;
+ description?: string;
+ category?: string;
+ status?: 'active' | 'inactive';
+}
+
+export interface ResourceFilter {
+ category?: string;
+ status?: 'active' | 'inactive';
+ search?: string;
+ limit?: number;
+ offset?: number;
+}
+
+export interface ApiResponse {
+ success: boolean;
+ data?: {
+ data: T;
+ total?: number;
+ };
+ error?: string;
+ message?: string;
+}
diff --git a/src/problem5/tsconfig.json b/src/problem5/tsconfig.json
new file mode 100644
index 0000000000..2e60854c7b
--- /dev/null
+++ b/src/problem5/tsconfig.json
@@ -0,0 +1,30 @@
+{
+ "compilerOptions": {
+ "target": "ES2020",
+ "module": "commonjs",
+ "lib": ["ES2020"],
+ "outDir": "./dist",
+ "rootDir": "./src",
+ "strict": true,
+ "esModuleInterop": true,
+ "skipLibCheck": true,
+ "forceConsistentCasingInFileNames": true,
+ "resolveJsonModule": true,
+ "declaration": true,
+ "declarationMap": true,
+ "sourceMap": true,
+ "noImplicitAny": true,
+ "strictNullChecks": true,
+ "strictFunctionTypes": true,
+ "strictBindCallApply": true,
+ "strictPropertyInitialization": true,
+ "noImplicitThis": true,
+ "alwaysStrict": true,
+ "noUnusedLocals": false,
+ "noUnusedParameters": false,
+ "noImplicitReturns": true,
+ "noFallthroughCasesInSwitch": true
+ },
+ "include": ["src/**/*"],
+ "exclude": ["node_modules", "dist"]
+}
diff --git a/src/problem6/.env b/src/problem6/.env
new file mode 100644
index 0000000000..9203b95a8e
--- /dev/null
+++ b/src/problem6/.env
@@ -0,0 +1,23 @@
+// API Configuration
+API_PORT=3000
+
+// Database Configuration (Audit Logs & User Accounts)
+DATABASE_URL=postgresql://user:pass@localhost:5432/scoreboard
+
+// Redis Configuration (Leaderboard - Primary Database)
+REDIS_URL=redis://localhost:6379
+LEADERBOARD_KEY=game:leaderboard
+PLAYER_META_PREFIX=player:meta:
+PLAYER_META_TTL_SECONDS=2592000 // 30 days
+
+// JWT Configuration
+JWT_SECRET=
+JWT_EXPIRY=3600 // 1 hour in seconds
+
+// Rate Limiting Configuration
+RATE_LIMIT_PER_MINUTE=100
+RATE_LIMIT_PER_IP=500 // global limit
+RATE_LIMIT_WINDOW=60 // seconds
+
+// Duplicate Action Detection (Using Redis)
+DUPLICATE_ACTION_WINDOW=300 // 5 minutes
\ No newline at end of file
diff --git a/src/problem1/.keep b/src/problem6/.keep
similarity index 100%
rename from src/problem1/.keep
rename to src/problem6/.keep
diff --git a/src/problem6/LeaderboardService.ts b/src/problem6/LeaderboardService.ts
new file mode 100644
index 0000000000..a1884947e6
--- /dev/null
+++ b/src/problem6/LeaderboardService.ts
@@ -0,0 +1,204 @@
+import Redis from 'ioredis';
+import WebSocket from 'ws';
+
+interface LeaderboardEntry {
+ rank: number;
+ username: string;
+ score: number;
+}
+
+interface PlayerStats {
+ username: string;
+ rank: number;
+ score: number;
+}
+
+interface PlayerMetadata {
+ [key: string]: string | number;
+}
+
+class LeaderboardService {
+ private readonly leaderboardKey: string;
+ private readonly playerMetaPrefix: string;
+ private readonly playerMetaTtlSeconds: number;
+ private readonly redis: Redis;
+ private readonly wss: WebSocket.Server;
+
+ constructor(redisCli: Redis, webSocketServer: WebSocket.Server) {
+ this.redis = redisCli;
+ this.wss = webSocketServer;
+ this.leaderboardKey = process.env.LEADERBOARD_KEY || "game:leaderboard";
+ this.playerMetaPrefix = process.env.PLAYER_META_PREFIX || "player:meta:";
+ this.playerMetaTtlSeconds = process.env.PLAYER_META_TTL_SECONDS || 60 * 60 * 24 * 30;
+ }
+
+ private getMetaKey(username: string): string {
+ return `${this.playerMetaPrefix}${username}`;
+ }
+
+ private toLeaderboardEntries(
+ rawEntries: (string | number)[],
+ startRank: number = 1
+ ): LeaderboardEntry[] {
+ const entries: LeaderboardEntry[] = [];
+
+ for (let i = 0; i < rawEntries.length; i += 2) {
+ entries.push({
+ rank: startRank + i / 2,
+ username: rawEntries[i] as string,
+ score: Number.parseInt(rawEntries[i + 1] as string, 10),
+ });
+ }
+
+ return entries;
+ }
+
+ private broadcastToClients(message: string): void {
+ this.wss.clients.forEach((client: any) => {
+ if (client.readyState === WebSocket.OPEN) {
+ client.send(message);
+ }
+ });
+ }
+
+ private createBroadcastMessage(type: string, data: any): string {
+ return JSON.stringify({
+ type,
+ data,
+ timestamp: Date.now(),
+ });
+ }
+
+
+ async setScore(username: string, score: number): Promise {
+ await this.redis.zadd(this.leaderboardKey, score, username);
+ }
+
+ async incrementScore(username: string, amount: number): Promise {
+ const newScore = await this.redis.zincrby(
+ this.leaderboardKey,
+ amount,
+ username
+ );
+ await this.broadcastLeaderboard();
+ await this.broadcastScoreChange(username, newScore);
+ }
+
+ async removePlayer(username: string): Promise {
+ await this.redis.zrem(this.leaderboardKey, username);
+ }
+
+ async resetLeaderboard(): Promise {
+ await this.redis.del(this.leaderboardKey);
+ }
+
+ async getTopN(limit: number = 10): Promise {
+ const rawEntries = await this.redis.zrange(
+ this.leaderboardKey,
+ 0,
+ limit - 1,
+ "REV",
+ "WITHSCORES"
+ );
+
+ return this.toLeaderboardEntries(rawEntries, 1);
+ }
+
+ async getRankRange(
+ fromRank: number,
+ toRank: number
+ ): Promise {
+ const rawEntries = await this.redis.zrange(
+ this.leaderboardKey,
+ fromRank - 1,
+ toRank - 1,
+ "REV",
+ "WITHSCORES"
+ );
+
+ return this.toLeaderboardEntries(rawEntries, fromRank);
+ }
+
+ async getPlayerStats(username: string): Promise {
+ const score = await this.redis.zscore(this.leaderboardKey, username);
+ if (score === null) {
+ return null;
+ }
+
+ let rank: number;
+
+ try {
+ const descendingRank = await this.redis.call(
+ "ZRANK",
+ this.leaderboardKey,
+ username,
+ "REV"
+ );
+ rank = (descendingRank as number) + 1;
+ } catch {
+ const [ascendingRank, totalPlayers] = await Promise.all([
+ this.redis.zrank(this.leaderboardKey, username),
+ this.redis.zcard(this.leaderboardKey),
+ ]);
+ rank = (totalPlayers as number) - (ascendingRank as number);
+ }
+
+ return {
+ username,
+ rank,
+ score: Number.parseInt(score as string, 10),
+ };
+ }
+
+ async getTotalPlayers(): Promise {
+ return this.redis.zcard(this.leaderboardKey) as Promise;
+ }
+
+ async getByScoreRange(
+ minScore: number,
+ maxScore: number
+ ): Promise {
+ const rawEntries = await this.redis.zrange(
+ this.leaderboardKey,
+ maxScore,
+ minScore,
+ "BYSCORE",
+ "REV",
+ "WITHSCORES"
+ );
+
+ return this.toLeaderboardEntries(rawEntries, 1);
+ }
+
+ async setPlayerMeta(
+ username: string,
+ metadata: PlayerMetadata
+ ): Promise {
+ if (!metadata || Object.keys(metadata).length === 0) {
+ return;
+ }
+
+ const metaKey = this.getMetaKey(username);
+ await this.redis.hset(metaKey, metadata);
+ await this.redis.expire(metaKey, this.playerMetaTtlSeconds);
+ }
+
+ async getPlayerMeta(username: string): Promise {
+ return this.redis.hgetall(
+ this.getMetaKey(username)
+ ) as Promise;
+ }
+
+ async broadcastLeaderboard(): Promise {
+ const leaderboard = await this.getTopN();
+ const message = this.createBroadcastMessage("LEADERBOARD_UPDATE", leaderboard);
+ this.broadcastToClients(message);
+ }
+
+ async broadcastScoreChange(username: string, newScore: number): Promise {
+ const message = this.createBroadcastMessage("SCORE_CHANGED", { username, newScore });
+ this.broadcastToClients(message);
+ }
+}
+
+export { LeaderboardService, LeaderboardEntry, PlayerStats, PlayerMetadata };
diff --git a/src/problem6/README.md b/src/problem6/README.md
new file mode 100644
index 0000000000..3c4431c014
--- /dev/null
+++ b/src/problem6/README.md
@@ -0,0 +1,880 @@
+# Scoreboard API Service - Specification
+
+## Overview
+
+The Scoreboard API Service is a backend module designed to manage user scores and provide real-time updates to a web-based scoreboard displaying the top 10 users. This specification outlines the architecture, API contracts, security measures, and implementation guidelines for the engineering team.
+
+### Key Features
+
+- Real-time score updates via WebSocket or polling
+- Secure score increment with authorization checks
+- Top 10 leaderboard retrieval
+- Prevention of unauthorized score manipulation
+- Audit logging for score changes
+- Rate limiting and DDoS protection
+
+### Architecture Highlights
+
+- **Redis as Primary Leaderboard Database:** Sorted Sets (ZSET) provide O(log N) operations, in-memory performance, and atomic operations for score updates
+- **PostgreSQL for Audit Logs:** Maintains full history of score changes for compliance and debugging
+- **Hybrid Database Strategy:** Fast leaderboard operations in Redis + reliable audit trail in PostgreSQL
+- **No Cache Invalidation:** Redis Sorted Sets serve as the single source of truth, eliminating cache coherency issues
+
+### Implementation Notes - Redis-Based Approach
+
+| Aspect | Traditional DB Approach | Redis Approach |
+|--------|------------------------|-----------------|
+| **Leaderboard Query** | `SELECT * FROM users ORDER BY score DESC LIMIT 10` (O(n log n)) | `ZRANGE game:leaderboard 0 9 REV WITHSCORES` (O(log n)) |
+| **Score Update** | Transaction with read lock + update | `ZINCRBY game:leaderboard 10 username` (atomic) |
+| **Response Time** | 50-200ms (disk I/O + sorting) | <5ms (in-memory) |
+| **Rank Lookup** | Complex query or separate index | `ZRANK game:leaderboard username REV` (O(log n)) |
+| **Cache Management** | Requires invalidation logic | N/A (single source of truth) |
+| **Consistency Model** | Strong consistency | Strong consistency (atomic operations) |
+| **Scalability** | Vertical (server hardware) | Horizontal (Redis cluster/replication) |
+
+### Why Redis Sorted Sets for Leaderboards?
+
+Redis Sorted Sets are purpose-built for ranking scenarios:
+
+- **Natural fit:** Members with scores, sorted by score automatically
+- **Atomic operations:** No race conditions, no need for complex locking
+- **Fast access patterns:** O(log n) for all operations (add, remove, rank, range)
+- **Built-in scoring:** Numeric scores with comparison built-in
+- **Perfect for real-time:** Sub-millisecond response times for any query
+
+---
+
+## System Architecture
+
+### High-Level Components
+
+```
+┌─────────────────────────────────────────────────────────┐
+│ Client (Website) │
+│ (Scoreboard Display + UI) │
+└────────────────────────┬────────────────────────────────┘
+ │
+ ┌──────────────────────────────┐
+ │ │
+ HTTP WebSocket
+ GET /leaderboard /ws/leaderboard
+ PUT /score/update │
+ │ │
+ │ │
+┌────────▼──────────────────────────────▼──────────────────┐
+│ Scoreboard API Service │
+│ ┌─────────────────────────────────────────────────────┐ │
+│ │ Authentication & Authorization │ │
+│ │ (JWT Validation, User Identity Verification) │ │
+│ └─────────────────────────────────────────────────────┘ │
+│ ┌─────────────────────────────────────────────────────┐ │
+│ │ Score Update Service │ │
+│ │ • Validate action completion │ │
+│ │ • Atomic score increment (ZINCRBY) │ │
+│ └─────────────────────────────────────────────────────┘ │
+│ ┌─────────────────────────────────────────────────────┐ │
+│ │ Leaderboard Service │ │
+│ │ • Fetch top N users (ZRANGE REV) │ │
+│ │ • Get player rank (ZRANK) │ │
+│ │ • Real-time broadcast │ │
+│ │ • Player metadata (HSET/HGETALL) │ │
+│ └─────────────────────────────────────────────────────┘ │
+│ ┌─────────────────────────────────────────────────────┐ │
+│ │ Audit & Logging Service │ │
+│ │ • Log score changes to PostgreSQL │ │
+│ │ • Track suspicious activities │ │
+│ │ • Compliance records │ │
+│ └─────────────────────────────────────────────────────┘ │
+└────────────────────┬─────────────────────────────────────┘
+ │
+ ┌───────────┴───────────┐
+ │ │
+ ▼ ▼
+ ┌─────────────────┐ ┌─────────────────┐
+ │PostgreSQL │ │Redis (Primary) │
+ │Database │ │Leaderboard │
+ │• User accounts │ │• Sorted Sets │
+ │• Audit logs │ │• Player metadata│
+ │• Metadata │ │• Real-time data │
+ └─────────────────┘ └─────────────────┘
+```
+
+---
+
+## API Endpoints
+
+### 1. **Get Leaderboard (Top 10)**
+
+**Endpoint:** `GET /api/leaderboard`
+
+**Description:** Retrieve the top 10 users with the highest scores.
+
+**Request:**
+
+```http
+GET /api/leaderboard HTTP/1.1
+```
+
+**Response (200 OK):**
+
+```json
+{
+ "success": true,
+ "data": {
+ "leaderboard": [
+ {
+ "rank": 1,
+ "userId": 1,
+ "username": "alice",
+ "score": 9850,
+ "lastUpdated": "2026-05-28T14:35:22Z"
+ },
+ {
+ "rank": 2,
+ "userId": 2,
+ "username": "bob",
+ "score": 9720,
+ "lastUpdated": "2026-05-28T14:30:10Z"
+ },
+ {
+ "rank": 3,
+ "userId": 3,
+ "username": "charlie",
+ "score": 9500,
+ "lastUpdated": "2026-05-28T14:20:05Z"
+ }
+ // ... 7 more users (up to rank 10)
+ ],
+ "generatedAt": "2026-05-28T14:36:00Z"
+ }
+}
+```
+
+---
+
+### 2. **Update User Score**
+
+**Endpoint:** `POST /api/score/update`
+
+**Description:** Increment a user's score upon action completion. This endpoint requires authentication and validates the action before updating the score.
+
+**Authentication:** Bearer Token (JWT)
+
+**Request:**
+
+```http
+POST /api/score/update HTTP/1.1
+Host: api.scoreboard.local
+Content-Type: application/json
+Authorization: Bearer
+
+{
+ "userId": 1,
+ "actionId": "action_update_score",
+ "actionTimestamp": "2026-05-28T14:35:15Z",
+ "point": 10,
+ "deviceInfo": {
+ "ip": "192.168.1.100",
+ "userAgent": "Mozilla/5.0..."
+ }
+}
+```
+
+**Response (200 OK):**
+
+```json
+{
+ "success": true,
+ "data": {
+ "userId": 1,
+ "newScore": 9850,
+ "scoreIncrement": 10,
+ "totalActionsCompleted": 985,
+ "leaderboardRank": 1,
+ "updatedAt": "2026-05-28T14:35:22Z"
+ }
+}
+```
+
+**Response (400 Bad Request):**
+
+```json
+{
+ "success": false,
+ "error": "Invalid action ID or missing required fields",
+ "code": "INVALID_REQUEST"
+}
+```
+
+**Response (401 Unauthorized):**
+
+```json
+{
+ "success": false,
+ "error": "Invalid or expired authentication token",
+ "code": "AUTH_FAILED"
+}
+```
+
+**Response (403 Forbidden):**
+
+```json
+{
+ "success": false,
+ "error": "User ID in token does not match request user ID",
+ "code": "USER_MISMATCH"
+}
+```
+
+**Response (409 Conflict):**
+
+```json
+{
+ "success": false,
+ "error": "Duplicate action submission detected",
+ "code": "DUPLICATE_ACTION"
+}
+```
+
+**Response (429 Too Many Requests):**
+
+```json
+{
+ "success": false,
+ "error": "Rate limit exceeded. Maximum 100 requests per minute",
+ "code": "RATE_LIMIT_EXCEEDED"
+}
+```
+
+---
+
+### 3. **WebSocket Connection (Real-time Updates)**
+
+**Endpoint:** `WS /ws/leaderboard`
+
+**Description:** Establish a WebSocket connection to receive real-time leaderboard updates when scores change.
+
+**Connection Request:**
+
+```javascript
+ws = new WebSocket('ws://api.scoreboard.local/ws/leaderboard?token=');
+
+ws.onopen = () => {
+ console.log('Connected to leaderboard updates');
+};
+
+ws.onmessage = (event) => {
+ const message = JSON.parse(event.data);
+ console.log('Leaderboard updated:', message);
+};
+```
+
+**Message Format (Leaderboard Update):**
+
+```json
+{
+ "type": "LEADERBOARD_UPDATE",
+ "timestamp": "2026-05-28T14:35:22Z",
+ "data": [
+ {
+ "rank": 1,
+ "userId": 1,
+ "username": "alice",
+ "score": 9850
+ },
+ // ... more users
+ ]
+}
+```
+
+**Message Format (Score Change):**
+
+```json
+{
+ "type": "SCORE_CHANGED",
+ "timestamp": "2026-05-28T14:35:22Z",
+ "data": {
+ "username": "alice",
+ "newScore": 9850,
+ }
+}
+```
+
+---
+
+## Database Schema
+
+### Redis Data Structures (Leaderboard - Primary Database)
+
+#### Sorted Set: Leaderboard Data
+
+```
+Key: game:leaderboard
+Type: Sorted Set (ZSET)
+Data: {username: score, username: score, ...}
+
+Example:
+ username: "alice" score: 9850
+ username: "bob" score: 9720
+ username: "charlie" score: 9500
+
+Useful Commands:
+ - ZADD game:leaderboard // Add/update score
+ - ZINCRBY game:leaderboard // Increment score (atomic)
+ - ZRANGE game:leaderboard 0 9 REV WITHSCORES // Get top 10
+ - ZRANK game:leaderboard REV // Get rank (1-indexed)
+ - ZSCORE game:leaderboard // Get user's score
+ - ZCARD game:leaderboard // Total players
+ - ZREM game:leaderboard // Remove player
+```
+
+#### Hash Set: Player Metadata (Optional)
+
+```
+Key: player:meta:{username}
+Type: Hash (HSET)
+Data: {field: value, field: value, ...}
+TTL: 1 days (automatically expires)
+
+Example for username "alice":
+Key: player:meta:alice
+Fields:
+ - email: alice@example.com
+ - region: US-East
+ - joinDate: 2024-01-15
+
+Useful Commands:
+ - HSET player:meta:alice field1 value1 field2 value2
+ - HGETALL player:meta:alice // Get all metadata
+ - EXPIRE player:meta:alice 2592000 // Set TTL (30 days)
+ - HDEL player:meta:alice field1 // Remove field
+```
+
+### PostgreSQL Database (Audit & Account Management)
+
+#### Users Table
+
+```sql
+CREATE TABLE users (
+ id INT PRIMARY KEY,
+ username VARCHAR(255) UNIQUE NOT NULL,
+ email VARCHAR(255) UNIQUE NOT NULL,
+ password_hash VARCHAR(255) NOT NULL,
+ created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+ updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+ is_active BOOLEAN DEFAULT true,
+ INDEX idx_username (username),
+ INDEX idx_created_at (created_at)
+);
+```
+
+#### Actions Table
+
+```sql
+CREATE TABLE actions (
+ id INT PRIMARY KEY,
+ user_id INT NOT NULL,
+ action_type VARCHAR(100) NOT NULL,
+ action_data JSON,
+ score_increment INT DEFAULT 10,
+ completed_at TIMESTAMP NOT NULL,
+ created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+ FOREIGN KEY (user_id) REFERENCES users(id),
+ INDEX idx_user_id (user_id),
+ INDEX idx_completed_at (completed_at DESC),
+ UNIQUE KEY unique_action_per_user (id, user_id)
+);
+```
+
+#### Score History Table (Audit Log)
+
+```sql
+CREATE TABLE score_history (
+ id INT PRIMARY KEY,
+ user_id INT NOT NULL,
+ action_id INT NOT NULL,
+ score_change INT NOT NULL,
+ new_score INT NOT NULL,
+ old_score INT NOT NULL,
+ username VARCHAR(255) NOT NULL,
+ change_reason VARCHAR(255),
+ ip_address VARCHAR(45),
+ user_agent VARCHAR(500),
+ created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+ FOREIGN KEY (user_id) REFERENCES users(id),
+ FOREIGN KEY (action_id) REFERENCES actions(id),
+ INDEX idx_user_id (user_id),
+ INDEX idx_created_at (created_at DESC),
+ INDEX idx_username (username)
+);
+```
+
+### Why Redis for Leaderboard?
+
+**Performance Benefits:**
+
+- O(log N) operations for sorted set queries (vs O(n log n) for SQL sorting)
+- In-memory storage = microsecond response times (vs milliseconds for disk I/O)
+- Atomic operations prevent race conditions
+- Natural data structure fit (sorted sets are perfect for leaderboards)
+- No complex joins or transactions needed
+
+**Trade-offs:**
+
+- Redis data persists in memory (use RDB snapshots or AOF for durability)
+- Limited to available RAM (but leaderboard is typically small data)
+- Audit logs still stored in PostgreSQL for compliance/history
+
+---
+
+## Security & Authorization
+
+### Authentication Flow
+
+1. **User Login:** User authenticates via login endpoint (not in this spec) and receives JWT token
+2. **Token Content:** JWT includes:
+ - `userId` - Unique user identifier
+ - `username` - Username
+ - `iat` - Issued at timestamp
+ - `exp` - Expiration timestamp (recommend: 1 hour)
+ - `scope` - Permissions (e.g., "score:update")
+
+### Authorization Checks
+
+**For Score Update Endpoint:**
+
+```
+1. Validate JWT token
+ - Check signature using secret key
+ - Verify token has not expired
+ - Return 401 if invalid/expired
+
+2. Verify user identity
+ - Extract userId from token
+ - Compare with userId in request body
+ - Return 403 if mismatch
+
+3. Rate limiting check
+ - Check if user exceeded rate limit (e.g., 100 requests/minute)
+ - Return 429 if exceeded
+
+4. Action validation
+ - Verify action exists and belongs to this user
+ - Check action was not already processed
+ - Return 409 if duplicate action detected
+
+5. Timestamp validation
+ - Verify actionTimestamp is within acceptable window (e.g., ±5 minutes)
+ - Prevent replay attacks
+ - Return 400 if timestamp is invalid
+
+6. IP/Device validation (optional)
+ - Compare current IP with user's profile
+ - Flag suspicious activities for audit log
+ - Allow but log if different from usual pattern
+```
+
+### Security Measures
+
+1. **Input Validation**
+ - Validate all input parameters against expected types/formats
+ - Sanitize strings to prevent injection attacks
+
+2. **Rate Limiting**
+ - Per-user rate limiting: 100 requests per minute
+ - Per-IP rate limiting: 500 requests per minute
+ - Use Redis or in-memory store to track request counts
+
+3. **Duplicate Detection**
+ - Track recently processed actionIds in Redis (TTL: 5 minutes)
+ - Prevent duplicate score increments from retry requests
+
+4. **Audit Logging**
+ - Log all score changes with full context
+ - Store IP address, user agent, timestamp
+ - Flag suspicious patterns (e.g., rapid score increases)
+
+5. **HTTPS Only**
+ - All endpoints must use HTTPS/WSS (WebSocket Secure)
+ - Enforce HTTPS redirect for HTTP requests
+
+6. **CORS Configuration**
+ - Restrict CORS to trusted domains only
+ - Set appropriate headers: `Access-Control-Allow-Origin`, `Access-Control-Allow-Methods`
+
+---
+
+## Execution Flow Diagrams
+
+### Score Update Flow
+
+```mermaid
+sequenceDiagram
+ participant Client as Client (Web)
+ participant API as Score Update API
+ participant Auth as Auth Service
+ participant Redis as Redis (Leaderboard DB)
+ participant PostgreSQL as PostgreSQL (Audit Log)
+ participant WS as WebSocket Handler
+
+ Client->>API: POST /api/score/update (with JWT)
+
+ API->>Auth: Validate JWT token
+ alt Token Invalid/Expired
+ Auth-->>API: 401 Unauthorized
+ API-->>Client: 401 Response
+ else Token Valid
+ Auth-->>API: Token verified
+
+ API->>PostgreSQL: Check action exists & not processed
+ alt Action Already Processed
+ PostgreSQL-->>API: Duplicate detected
+ API-->>Client: 409 Conflict
+ else Action Valid
+ PostgreSQL-->>API: Action retrieved
+
+ API->>API: Calculate score increment (10 points)
+
+ API->>Redis: ZINCRBY game:leaderboard 10 username
+ Redis-->>API: New score (atomic operation)
+
+ API->>Redis: ZRANK game:leaderboard username REV
+ Redis-->>API: User's rank
+
+ API->>PostgreSQL: Insert score history record (async/background)
+
+ API->>WS: Broadcast leaderboard update to all clients
+ WS-->>Client: WebSocket message (LEADERBOARD_UPDATE)
+
+ API-->>Client: 200 OK (new score + rank from Redis)
+ end
+ end
+```
+
+**Key Improvements with Redis:**
+
+- Score increment is atomic (no race conditions with ZINCRBY)
+- Rank lookup is instant with ZRANK REV
+- No cache invalidation needed
+- Direct read from primary source (Redis Sorted Set)
+
+### Leaderboard Retrieval Flow
+
+```mermaid
+sequenceDiagram
+ participant Client as Client (Web)
+ participant API as Leaderboard API
+ participant Redis as Redis (Primary DB)
+
+ Client->>API: GET /api/leaderboard
+
+ API->>Redis: ZRANGE game:leaderboard 0 9 REV WITHSCORES
+
+ Redis-->>API: Top 10 users with scores (microseconds)
+
+ API->>API: Format response
+
+ API-->>Client: 200 OK (fresh data from Redis)
+```
+
+**Note:** No caching layer needed - Redis Sorted Sets are optimized for this exact use case and provide sub-millisecond response times.
+
+### WebSocket Real-time Update Flow
+
+```mermaid
+sequenceDiagram
+ participant Client1 as Client 1
+ participant Client2 as Client 2
+ participant WSServer as WebSocket Server
+ participant API as Score Update API
+ participant Redis as Redis (Leaderboard DB)
+
+ Client1->>WSServer: WS /ws/leaderboard (subscribe)
+ WSServer-->>Client1: Connected
+ Client2->>WSServer: WS /ws/leaderboard (subscribe)
+ WSServer-->>Client2: Connected
+
+ Client1->>API: POST /api/score/update (user1 score +10)
+
+ API->>Redis: ZINCRBY game:leaderboard 10 username
+ Redis-->>API: New score
+
+ API->>Redis: ZRANGE game:leaderboard 0 9 REV WITHSCORES
+ Redis-->>API: Current top 10 data
+
+ API->>WSServer: Broadcast LEADERBOARD_UPDATE
+ WSServer-->>Client1: LEADERBOARD_UPDATE message
+ Client1->>Client1: Update UI with new leaderboard
+ WSServer-->>Client2: LEADERBOARD_UPDATE message
+ Client2->>Client2: Update UI with new leaderboard
+
+ API->>WSServer: Broadcast SCORE_CHANGED
+ WSServer-->>Client1: SCORE_CHANGED message
+ Client1->>Client1: Update UI with new score
+
+```
+
+**Benefits:**
+
+- Single source of truth (Redis, not fragmented cache + DB)
+- Consistent data across all clients
+- No cache coherency issues
+- Instant updates without synchronization delays
+
+---
+
+## Implementation Guidelines
+
+### Technology Stack (Recommendations)
+
+- **Framework:** Node.js (Express)
+- **Leaderboard Database:** Redis (Primary - Sorted Sets for leaderboard, Hashes for metadata)
+- **Audit & Account Database:** PostgreSQL (ACID transactions for audit logs and user accounts)
+- **Real-time Communication:** Socket.io or native WebSockets
+- **Authentication:** JWT with RS256 algorithm (asymmetric signing)
+- **Rate Limiting:** Redis (with sliding window algorithm)
+- **Implementation Reference:** See [LeaderboardService.ts](LeaderboardService.ts), [RedisCLient.ts](RedisCLient.ts) for implementation example
+
+### Configuration
+
+```bash
+// API Configuration
+API_PORT=3000
+
+// Database Configuration (Audit Logs & User Accounts)
+DATABASE_URL=postgresql://user:pass@localhost:5432/scoreboard
+
+// Redis Configuration (Leaderboard - Primary Database)
+REDIS_URL=redis://localhost:6379
+LEADERBOARD_KEY=game:leaderboard
+PLAYER_META_PREFIX=player:meta:
+PLAYER_META_TTL_SECONDS=2592000 // 30 days
+
+// JWT Configuration
+JWT_SECRET=
+JWT_EXPIRY=3600 // 1 hour in seconds
+
+// Rate Limiting Configuration
+RATE_LIMIT_PER_MINUTE=100
+RATE_LIMIT_PER_IP=500 // global limit
+RATE_LIMIT_WINDOW=60 // seconds
+
+// Duplicate Action Detection (Using Redis)
+DUPLICATE_ACTION_WINDOW=300 // 5 minutes
+```
+
+### Error Handling
+
+All error responses must follow this format:
+
+```json
+{
+ "success": false,
+ "error": "Human-readable error message",
+ "code": "ERROR_CODE",
+ "timestamp": "2026-05-28T14:35:22Z"
+}
+```
+
+### Logging
+
+Log all significant events:
+
+- User authentication (success/failure)
+- Score updates (userId, amount, timestamp)
+- Suspicious activities (duplicate actions, unusual patterns)
+- API errors and exceptions
+- Performance metrics (response times, cache hit rates)
+
+---
+
+## Improvement Suggestions & Considerations
+
+### 1. **Score Decay / Time-Based Ranking**
+
+**Current Issue:** Older high scores remain at the top indefinitely.
+
+**Suggestion:** Implement a score decay mechanism where scores gradually decrease over time, encouraging continuous engagement. Or use a time-weighted leaderboard (top scores in last 7 days).
+
+```
+Formula: adjusted_score = score * decay_factor ^ (days_since_update)
+where decay_factor = 0.95 (5% decay per day)
+```
+
+### 2. **Anti-Cheat Mechanisms**
+
+**Current Issue:** Specification assumes valid action completion, but doesn't validate actions on backend.
+
+**Suggestions:**
+
+- Implement server-side action validation
+- Track action completion patterns and flag anomalies (e.g., 1000 actions in 1 minute)
+- Use machine learning for fraud detection
+- Implement CAPTCHA for users with suspicious patterns
+
+### 3. **Tiered Scoring System**
+
+**Current Issue:** All actions give fixed score increment (10 points).
+
+**Suggestion:** Implement difficulty-based scoring:
+
+```
+- Easy action: +5 points
+- Medium action: +10 points
+- Hard action: +25 points
+- Rare achievement: +100 points
+```
+
+### 4. **Pagination for Leaderboard**
+
+**Current Issue:** Only returns top 10 users.
+
+**Suggestion:**
+
+- Add pagination support: `GET /api/leaderboard?page=1&limit=10`
+- Add user's current rank and nearby users: `GET /api/leaderboard/around-me`
+
+### 5. **Redis Persistence & Durability**
+
+**Current Implementation:** Redis stores leaderboard in memory.
+
+**Recommendation:**
+
+- Enable Redis RDB snapshots: `BGSAVE` every 60 seconds
+- Or enable AOF (Append-Only File) for write durability
+- Or use Redis replication with a secondary replica
+- Consider "redis:latest" with persistent volume for production
+
+```bash
+// Redis configuration for durability
+save 60 1000 // Snapshot every 60 sec if 1000 keys changed
+appendonly yes // Enable AOF
+appendfsync everysec // Fsync every second
+```
+
+### 6. **Multiple Leaderboards in Redis**
+
+**Suggestion:** Support multiple leaderboards using different keys:
+
+```javascript
+// Global leaderboard
+game:leaderboard:global
+
+// Season leaderboards
+game:leaderboard:season:season-1
+game:leaderboard:season:season-2
+
+// Team leaderboards
+game:leaderboard:team:team-001
+game:leaderboard:team:team-002
+
+// All commands work the same way with different keys
+ZADD game:leaderboard:season:season-1 100 username
+ZRANGE game:leaderboard:season:season-1 0 9 REV WITHSCORES
+```
+
+### 7. **Seasonal/Reset Mechanics**
+
+**Current Issue:** Leaderboard grows indefinitely without reset.
+
+**Suggestion:**
+
+- Reset leaderboard monthly/quarterly using separate Redis keys
+- Archive previous season leaderboards to PostgreSQL
+- Show "All-Time" vs "This Season" options
+
+```javascript
+// Season management
+game:leaderboard:2026-05 // Current season
+game:leaderboard:2026-04 // Previous season (archived to PostgreSQL)
+
+// At season end:
+// 1. Backup current leaderboard to PostgreSQL
+// 2. Create new leaderboard key for new season
+// 3. Keep old key for historical queries
+```
+
+### 8. **Data Consistency & Redis Replication**
+
+**Current Implementation:** Single Redis instance.
+
+**Recommendation for High Availability:**
+
+- Deploy Redis cluster with replication (primary + replicas)
+- Use Sentinel for automatic failover
+- Ensure RDB snapshots are replicated across nodes
+
+```
+ ┌─────────────────┐
+ │ Redis Primary │
+ │ (Leaderboard) │
+ └────────┬────────┘
+ │
+ ┌──────┴──────┐
+ │ │
+ ▼ ▼
+┌──────────┐ ┌──────────┐
+│ Replica 1│ │ Replica 2│
+└──────────┘ └──────────┘
+```
+
+### 9. **Performance Optimization**
+
+**Suggestions (Redis-specific):**
+
+- Monitor Redis memory usage (`INFO memory`)
+- Use Redis SCAN instead of KEYS for large datasets
+- Implement connection pooling to Redis
+- Use pipelining for batch operations to reduce network round trips
+- Monitor Redis CPU usage and response times
+
+```javascript
+// Pipelining example - reduces network round trips
+const pipeline = redisClient.pipeline();
+for (let i = 0; i < 100; i++) {
+ pipeline.zadd('game:leaderboard', score[i], username[i]);
+}
+await pipeline.exec();
+```
+
+### 10. **Testing Strategy**
+
+**Recommendations:**
+
+- Unit tests for leaderboard service (Redis operations)
+- Integration tests for API endpoints with real Redis
+- Load testing for concurrent score updates (ZINCRBY stress test)
+- Security testing (SQL injection, XSS, CSRF, JWT validation)
+- End-to-end tests for the full flow (Score update → WebSocket broadcast)
+- Redis failover tests (test behavior when Redis is unavailable)
+
+### 11. **Monitoring & Alerting**
+
+**Suggestions:**
+
+- Monitor API response times (target: <100ms for 95th percentile with Redis)
+- Alert on error rates exceeding threshold
+- Monitor Redis memory usage (alert if >80% of max memory)
+- Monitor Redis eviction policies
+- Alert on suspicious score patterns (e.g., 100 score increases in 1 second)
+- Track WebSocket connection counts and message volumes
+- Monitor PostgreSQL audit log write latency
+
+---
+
+## Summary
+
+This specification provides a robust, secure, and scalable foundation for the Scoreboard API Service using a hybrid architecture:
+
+**Redis Layer:** High-performance leaderboard operations (Sorted Sets)
+**PostgreSQL Layer:** Reliable audit logs and user account management
+
+The implementation should prioritize:
+
+1. **Security:** Strong authentication, authorization, and input validation
+2. **Performance:** Redis ZSET operations for instant leaderboard updates (<10ms)
+3. **Reliability:** Audit logging to PostgreSQL for compliance and debugging
+4. **Scalability:** Stateless API design with Redis replication for high availability
+5. **Data Integrity:** PostgreSQL transactions for account management + Redis atomicity for scores
+
+Follow the API contracts closely to ensure client compatibility. Implement all security measures to prevent unauthorized score manipulation.
diff --git a/src/problem6/RedisClient.ts b/src/problem6/RedisClient.ts
new file mode 100644
index 0000000000..2024b7fc84
--- /dev/null
+++ b/src/problem6/RedisClient.ts
@@ -0,0 +1,104 @@
+import Redis from "ioredis";
+
+class RedisClient {
+ private client: Redis;
+ private host: string;
+ private port: number;
+
+ constructor() {
+ this.host = process.env.REDIS_HOST || "127.0.0.1";
+ this.port = Number.parseInt(process.env.REDIS_PORT || "6379", 10);
+
+ this.client = new Redis({
+ host: this.host,
+ port: this.port,
+ lazyConnect: true,
+ retryStrategy: this.retryStrategy.bind(this),
+ });
+
+ this.setupEventHandlers();
+ }
+
+ private retryStrategy(retryCount: number): number | null {
+ if (retryCount > 5) {
+ console.error("Redis connection failed after 5 retries.");
+ console.error("Make sure your Redis server is running.");
+ return null;
+ }
+
+ return Math.min(retryCount * 300, 3000);
+ }
+
+ private setupEventHandlers(): void {
+ this.client.on("connect", () => {
+ console.log(`Redis connected at ${this.host}:${this.port}`);
+ });
+
+ this.client.on("error", (error) => {
+ console.error("Redis error:", error.message);
+ });
+ }
+
+ async connect(): Promise {
+ await this.client.connect();
+ }
+
+ async disconnect(): Promise {
+ await this.client.disconnect();
+ }
+
+ zadd(key: string, score: number, member: string): Promise {
+ return this.client.zadd(key, score, member);
+ }
+
+ zrange(
+ key: string,
+ start: number,
+ stop: number,
+ ...args: string[]
+ ): Promise<(string | number)[]> {
+ return this.client.zrange(key, start, stop, ...args);
+ }
+
+ zscore(key: string, member: string): Promise {
+ return this.client.zscore(key, member);
+ }
+
+ zincrby(key: string, increment: number, member: string): Promise {
+ return this.client.zincrby(key, increment, member);
+ }
+
+ zrem(key: string, member: string): Promise {
+ return this.client.zrem(key, member);
+ }
+
+ zrank(key: string, member: string): Promise {
+ return this.client.zrank(key, member);
+ }
+
+ zcard(key: string): Promise {
+ return this.client.zcard(key);
+ }
+
+ del(key: string): Promise {
+ return this.client.del(key);
+ }
+
+ hset(key: string, data: Record): Promise {
+ return this.client.hset(key, data);
+ }
+
+ hgetall(key: string): Promise> {
+ return this.client.hgetall(key);
+ }
+
+ expire(key: string, seconds: number): Promise {
+ return this.client.expire(key, seconds);
+ }
+
+ call(command: string, ...args: (string | number)[]): Promise {
+ return this.client.call(command, ...args);
+ }
+}
+
+export { RedisClient };
\ No newline at end of file