Migrate database from MySQL to Supabase PostgreSQL

- Added @supabase/supabase-js client library
- Rewrote database.js to use Supabase API
- Updated server.js health check for Supabase
- Updated db.config.example.js with Supabase format
- Created comprehensive SUPABASE_SETUP.md guide
- Added SQL schema files for easy deployment
- Updated README_DB_CONFIG.md for Supabase

Benefits:
- Managed PostgreSQL database
- Built-in Row Level Security
- Real-time capabilities
- Easy monitoring via dashboard
- Free tier for development

README_DB_CONFIG.md

@@ -1,125 +1,86 @@
-# Database Configuration Setup
+# Database Configuration Setup - Supabase
 
 ## Overview
 Database credentials are stored in a separate configuration file (`db.config.js`) that is **NOT committed to GitHub** for security reasons.
 
+This project now uses **Supabase** (PostgreSQL) instead of MySQL.
+
 ## Files
 
 ### 1. `db.config.example.js` (Committed to Git)
-Template file showing the required configuration structure.
+Template file showing the required Supabase configuration structure.
 
 ### 2. `db.config.js` (NOT Committed - in .gitignore)
-Contains actual database credentials. This file must be created manually.
+Contains actual Supabase credentials. This file must be created manually.
 
 ### 3. `.gitignore`
 Ensures `db.config.js` is never committed to the repository.
 
-## Setup Instructions
+## Quick Setup
 
-### For Local Development
+See **[SUPABASE_SETUP.md](SUPABASE_SETUP.md)** for detailed step-by-step instructions.
 
-1. **Copy the example file:**
-   ```bash
-   cp db.config.example.js db.config.js
-   ```
+### Quick Start
 
-2. **Edit `db.config.js` with your credentials:**
+1. **Create Supabase project** at [app.supabase.com](https://app.supabase.com)
+2. **Copy credentials** from Project Settings → API
+3. **Update `db.config.js`:**
    ```javascript
    module.exports = {
-       host: 'localhost',  // or your database host
-       user: 'your_username',
-       password: 'your_password',
-       database: 'appgconnect5_db',
-       waitForConnections: true,
-       connectionLimit: 10,
-       queueLimit: 0
+       supabaseUrl: 'https://xxxxx.supabase.co',
+       supabaseAnonKey: 'eyJhbGci...',
+       supabasePassword: 't1hWsackxbYzRIPD'
    };
    ```
-
-3. **Start the server:**
-   ```bash
-   npm start
-   ```
-
-### For Production Deployment
-
-1. **Pull the latest code on your server:**
-   ```bash
-   git pull origin main
-   ```
-
-2. **Create `db.config.js` on the production server:**
-   ```bash
-   nano db.config.js
-   # or
-   vi db.config.js
-   ```
-
-3. **Add your production database credentials:**
-   ```javascript
-   module.exports = {
-       host: 'your-production-db-host.com',
-       user: 'production_user',
-       password: 'secure_production_password',
-       database: 'appgconnect5_db',
-       waitForConnections: true,
-       connectionLimit: 10,
-       queueLimit: 0
-   };
-   ```
-
-4. **Save and restart the server:**
-   ```bash
-   pm2 restart connect5
-   # or your restart command
-   ```
+4. **Run SQL schema** in Supabase SQL Editor (see SUPABASE_SETUP.md)
+5. **Start server:** `npm start`
 
 ## Security Features
 
 ✅ **Credentials not in git** - `db.config.js` is in `.gitignore`  
 ✅ **Template provided** - `db.config.example.js` shows the structure  
-✅ **Comments in code** - Clear instructions in `database.js`  
+✅ **Supabase RLS** - Row Level Security policies protect data  
 ✅ **Separate config** - Easy to update without touching main code  
 
 ## Troubleshooting
 
 ### Error: Cannot find module './db.config.js'
 
-**Solution:** You need to create the `db.config.js` file:
+**Solution:** Create the `db.config.js` file:
 ```bash
 cp db.config.example.js db.config.js
-# Then edit with your credentials
+# Then edit with your Supabase credentials
 ```
 
-### Error: Access denied for user
+### Error: Invalid API key
 
 **Solution:** Check your credentials in `db.config.js`:
-- Verify username
-- Verify password  
-- Check host address
-- Ensure user has proper permissions
+- Verify `supabaseUrl` is correct
+- Verify `supabaseAnonKey` (should start with `eyJ...`)
+- Get credentials from Supabase dashboard → Project Settings → API
 
-### Connection timeout
+### Error: Table 'players' does not exist
 
 **Solution:**
-- Check if MySQL server is running
-- Verify firewall allows connection
-- Check host address is correct
+- Run the SQL schema in Supabase SQL Editor
+- See SUPABASE_SETUP.md Step 4 for the complete schema
 
 ## Important Notes
 
 ⚠️ **NEVER commit `db.config.js` to git**  
-⚠️ **Keep production credentials secure**  
-⚠️ **Use different credentials for dev/prod**  
-⚠️ **Regularly rotate passwords**  
+⚠️ **Keep credentials secure**  
+⚠️ **Use different projects for dev/prod**  
+⚠️ **The anon key is safe for client-side use** (protected by RLS)  
 
 ## File Structure
 
 ```
 Connect-5/
-├── db.config.example.js  ← Template (in git)
-├── db.config.js          ← Your credentials (NOT in git)
-├── .gitignore            ← Protects db.config.js
-├── database.js           ← Imports from db.config.js
-└── README_DB_CONFIG.md   ← This file
+├── db.config.example.js     ← Template (in git)
+├── db.config.js             ← Your credentials (NOT in git)
+├── .gitignore               ← Protects db.config.js
+├── database.js              ← Imports from db.config.js
+├── supabase-functions.sql   ← Helper functions for Supabase
+├── SUPABASE_SETUP.md        ← Detailed setup guide
+└── README_DB_CONFIG.md      ← This file
 ```