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

postgres-schema.sql

@@ -0,0 +1,117 @@
+-- ============================================
+-- Connect-5 PostgreSQL Database Schema
+-- Run this on your PostgreSQL server at:
+-- 202.171.184.108
+-- Database: connect5
+-- ============================================
+
+-- INSTRUCTIONS:
+-- 1. Connect to your PostgreSQL server
+-- 2. Ensure database 'connect5' exists (CREATE DATABASE connect5;)
+-- 3. Connect to the connect5 database
+-- 4. Run this entire script
+
+-- ============================================
+-- Create Tables
+-- ============================================
+
+-- Create players table
+CREATE TABLE IF NOT EXISTS players (
+    id BIGSERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    total_wins INT DEFAULT 0,
+    total_losses INT DEFAULT 0,
+    total_draws INT DEFAULT 0,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_username ON players(username);
+
+-- Create active sessions table
+CREATE TABLE IF NOT EXISTS active_sessions (
+    session_id VARCHAR(100) PRIMARY KEY,
+    player_id BIGINT NOT NULL,
+    username VARCHAR(50) NOT NULL,
+    connected_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    last_heartbeat TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    FOREIGN KEY (player_id) REFERENCES players(id) ON DELETE CASCADE
+);
+
+-- Create game state enum type
+DO $$ BEGIN
+    CREATE TYPE game_state_enum AS ENUM ('pending', 'active', 'completed', 'abandoned');
+EXCEPTION
+    WHEN duplicate_object THEN null;
+END $$;
+
+-- Create games table
+CREATE TABLE IF NOT EXISTS games (
+    id BIGSERIAL PRIMARY KEY,
+    player1_id BIGINT NOT NULL,
+    player2_id BIGINT NOT NULL,
+    player1_username VARCHAR(50) NOT NULL,
+    player2_username VARCHAR(50) NOT NULL,
+    board_size INT DEFAULT 15,
+    winner_id BIGINT,
+    game_state game_state_enum DEFAULT 'pending',
+    started_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    completed_at TIMESTAMP WITH TIME ZONE,
+    FOREIGN KEY (player1_id) REFERENCES players(id),
+    FOREIGN KEY (player2_id) REFERENCES players(id),
+    FOREIGN KEY (winner_id) REFERENCES players(id)
+);
+
+-- Create game moves table
+CREATE TABLE IF NOT EXISTS game_moves (
+    id BIGSERIAL PRIMARY KEY,
+    game_id BIGINT NOT NULL,
+    player_id BIGINT NOT NULL,
+    row_position INT NOT NULL,
+    col_position INT NOT NULL,
+    move_number INT NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    FOREIGN KEY (game_id) REFERENCES games(id) ON DELETE CASCADE,
+    FOREIGN KEY (player_id) REFERENCES players(id)
+);
+CREATE INDEX IF NOT EXISTS idx_game ON game_moves(game_id);
+
+-- ============================================
+-- Create Functions
+-- ============================================
+
+-- Function to increment wins
+CREATE OR REPLACE FUNCTION increment_wins(player_id_param BIGINT)
+RETURNS void AS $$
+BEGIN
+    UPDATE players SET total_wins = total_wins + 1 WHERE id = player_id_param;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Function to increment losses
+CREATE OR REPLACE FUNCTION increment_losses(player_id_param BIGINT)
+RETURNS void AS $$
+BEGIN
+    UPDATE players SET total_losses = total_losses + 1 WHERE id = player_id_param;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Function to increment draws
+CREATE OR REPLACE FUNCTION increment_draws(player_id_param BIGINT)
+RETURNS void AS $$
+BEGIN
+    UPDATE players SET total_draws = total_draws + 1 WHERE id = player_id_param;
+END;
+$$ LANGUAGE plpgsql;
+
+-- ============================================
+-- Verification
+-- ============================================
+
+-- Verify tables were created
+SELECT 
+    'Tables Created Successfully!' as status,
+    COUNT(*) as table_count 
+FROM information_schema.tables 
+WHERE table_schema = 'public' 
+AND table_name IN ('players', 'active_sessions', 'games', 'game_moves');
+
+-- Expected result: table_count = 4