feat: PostgreSQL session store

Replaces MemoryStore with connect-pg-simple.
Sessions now persist across Arbiter restarts.
Table 'session' auto-created if missing.

Signed-off-by: Claude (Chronicler #61) <claude@firefrostgaming.com>

services/arbiter-3.0/src/index.js

@@ -2,11 +2,13 @@ require('dotenv').config();
 const express = require('express');
 const expressLayouts = require('express-ejs-layouts');
 const session = require('express-session');
+const PgSession = require('connect-pg-simple')(session);
 const passport = require('passport');
 const DiscordStrategy = require('passport-discord').Strategy;
 const { Client, GatewayIntentBits, REST, Routes } = require('discord.js');
 const csrf = require('csurf');
 const cors = require('cors');
+const { Pool } = require('pg');
 
 const authRoutes = require('./routes/auth');
 const adminRoutes = require('./routes/admin/index');
@@ -16,6 +18,15 @@ const { registerEvents } = require('./discord/events');
 const { linkCommand } = require('./discord/commands');
 const { initCron } = require('./sync/cron');
 
+// PostgreSQL connection pool for sessions
+const pgPool = new Pool({
+    user: process.env.DB_USER,
+    host: process.env.DB_HOST,
+    database: process.env.DB_NAME,
+    password: process.env.DB_PASSWORD,
+    port: process.env.DB_PORT || 5432
+});
+
 // Initialize Discord Client
 const client = new Client({ intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMembers] });
 registerEvents(client);
@@ -64,6 +75,11 @@ app.use(express.urlencoded({ extended: true }));
 app.locals.client = client;
 
 app.use(session({
+    store: new PgSession({
+        pool: pgPool,
+        tableName: 'session',
+        createTableIfMissing: true
+    }),
     secret: process.env.SESSION_SECRET,
     resave: false,
     saveUninitialized: false,