Migrate from Supabase to direct PostgreSQL connection

- Replace @supabase/supabase-js with native pg library
- Rewrite database.js to use PostgreSQL connection pool
- Update server.js with PostgreSQL connection testing
- Create postgres-schema.sql with complete database schema
- Add apply-schema.js script for easy schema deployment
- Update all documentation (README.md, DEPLOYMENT.md, deploy.sh)
- Remove Supabase-specific files and references
- Update db.config.example.js with PostgreSQL format

README.md

@@ -10,7 +10,7 @@ A beautiful, feature-rich implementation of the classic Connect-5 (Gomoku) game
 
 [![Node.js](https://img.shields.io/badge/Node.js-18+-green.svg)](https://nodejs.org/)
 [![Socket.io](https://img.shields.io/badge/Socket.io-4.0+-blue.svg)](https://socket.io/)
-[![Supabase](https://img.shields.io/badge/Supabase-PostgreSQL-3ECF8E.svg)](https://supabase.com/)
+[![PostgreSQL](https://img.shields.io/badge/PostgreSQL-3ECF8E.svg)](https://postgresql.org/)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 
 [Play Now](https://connect5.beyondcloud.technology/) • [Features](#features) • [Installation](#installation) • [Usage](#usage) • [Multiplayer](#multiplayer) • [Tech Stack](#tech-stack)
@@ -70,7 +70,7 @@ A beautiful, feature-rich implementation of the classic Connect-5 (Gomoku) game
 
 ### Prerequisites
 - **Node.js** 18+ ([Download](https://nodejs.org/))
-- **Supabase Account** (Free tier available at [supabase.com](https://supabase.com/))
+- **PostgreSQL** Database ([Download](https://www.postgresql.org/download/))
 - **Git** ([Download](https://git-scm.com/))
 
 ### Quick Start
@@ -84,12 +84,14 @@ cd Connect-5
 npm install
 
 # Configure database
-# 1. Create a Supabase project at https://supabase.com
+# 1. Ensure PostgreSQL is running and create the database:
+#    CREATE DATABASE connect5;
 # 2. Copy db.config.example.js to db.config.js
 cp db.config.example.js db.config.js
 
-# 3. Edit db.config.js with your Supabase credentials
-# 4. Run the SQL schema in Supabase SQL Editor (see SUPABASE_SETUP.md)
+# 3. Edit db.config.js with your PostgreSQL credentials
+# 4. Run the SQL schema
+psql -h HOST -U postgres -d connect5 -f postgres-schema.sql
 
 # Start the server
 npm start
@@ -97,7 +99,7 @@ npm start
 
 The server will start on **http://localhost:3000**
 
-For detailed setup instructions, see [SUPABASE_SETUP.md](SUPABASE_SETUP.md)
+For detailed setup instructions, see [README_DB_CONFIG.md](README_DB_CONFIG.md)
 
 ---
 
@@ -192,16 +194,16 @@ For detailed setup instructions, see [SUPABASE_SETUP.md](SUPABASE_SETUP.md)
 - **Supabase Client**: PostgreSQL database client with real-time capabilities
 
 ### Database
-- **Supabase**: Managed PostgreSQL database with real-time subscriptions
-- **Row Level Security**: Built-in security policies
-- **Auto-generated APIs**: RESTful and real-time APIs
+- **PostgreSQL**: Robust open-source relational database
+- **Connection Pooling**: Efficient connection management
+- **Native SQL**: Direct PostgreSQL queries for performance
 
 ### Dependencies
 ```json
 {
   "express": "^4.18.2",
   "socket.io": "^4.6.1",
-  "@supabase/supabase-js": "^2.39.0",
+  "pg": "^8.11.3",
   "bad-words": "^3.0.4",
   "cors": "^2.8.5",
   "nodemon": "^2.0.22"
@@ -221,7 +223,7 @@ Connect-5/
 ├── 🌐 multiplayer.js       # Multiplayer client logic
 ├── 🖼️ Logo.png             # BCT logo
 ├── 🔧 server.js            # Express & Socket.io server
-├── 💾 database.js          # MySQL connection & queries
+├── 💾 database.js          # PostgreSQL connection & queries
 ├── 🎯 gameManager.js       # Multiplayer game management
 ├── 📦 package.json         # Dependencies
 └── 📚 README.md            # This file
@@ -243,14 +245,16 @@ Edit `db.config.js`:
 
 ```javascript
 module.exports = {
-    supabaseUrl: 'https://your-project.supabase.co',
-    supabaseAnonKey: 'your-anon-key-here',
-    supabasePassword: 'your-database-password',
-    postgresConnectionString: 'postgresql://postgres:password@...'
+    HOST: 'your-postgres-host',
+    USER: 'postgres',
+    PASSWORD: 'your-database-password',
+    DB: 'connect5',
+    dialect: 'postgres',
+    pool: { max: 5, min: 0, acquire: 30000, idle: 10000 }
 };
 ```
 
-See [SUPABASE_SETUP.md](SUPABASE_SETUP.md) for detailed setup instructions.
+See [README_DB_CONFIG.md](README_DB_CONFIG.md) for detailed setup instructions.
 
 ### Server Configuration
 
@@ -272,7 +276,7 @@ sudo bash deploy.sh
 
 The script will:
 - ✅ Prompt for project directory
-- ✅ Request Supabase credentials
+- ✅ Request PostgreSQL credentials
 - ✅ Configure database connection
 - ✅ Install dependencies
 - ✅ Detect and configure web server (Nginx/Apache)
@@ -328,8 +332,8 @@ npm start
 ## 🐛 Troubleshooting
 
 ### Connection Refused Error
-**Problem**: Cannot connect to Supabase database  
-**Solution**: Verify credentials in `db.config.js` and check Supabase dashboard
+**Problem**: Cannot connect to PostgreSQL database  
+**Solution**: Verify credentials in `db.config.js` and check PostgreSQL is running
 
 ### Port Already in Use
 **Problem**: Port 3000 is already occupied  
@@ -345,7 +349,7 @@ npm start
 
 ### Database Disconnected
 **Problem**: Status bar shows "Disconnected"  
-**Solution**: Check `db.config.js` credentials and Supabase project status
+**Solution**: Check `db.config.js` credentials and PostgreSQL server status
 
 For more troubleshooting, see [DEPLOYMENT.md](DEPLOYMENT.md)