```javascript
const express = require('express');
const sqlite3 = require('sqlite3').verbose();
const path = require('path');
const app = express();
const PORT = process.env.PORT || 3000;

// Initialize database
const db = new sqlite3.Database('./stockfolio.db', (err) => {
    if (err) {
        console.error('Database connection error:', err.message);
    } else {
        console.log('Connected to SQLite database');
        initializeDatabase();
    }
});

function initializeDatabase() {
    db.serialize(() => {
        // Create tables if they don't exist
        db.run(`CREATE TABLE IF NOT EXISTS users (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            name TEXT NOT NULL,
            email TEXT UNIQUE NOT NULL,
            password TEXT NOT NULL,
            uac_verified BOOLEAN DEFAULT 0,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )`);

        db.run(`CREATE TABLE IF NOT EXISTS companies (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            symbol TEXT UNIQUE NOT NULL,
            name TEXT NOT NULL,
            sector TEXT NOT NULL,
            current_price REAL NOT NULL,
            change_percent REAL NOT NULL,
            volume INTEGER NOT NULL,
            market_cap REAL,
            pe_ratio REAL,
            dividend_yield REAL,
            last_updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )`);

        db.run(`CREATE TABLE IF NOT EXISTS sectors (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            name TEXT UNIQUE NOT NULL,
            weightage REAL NOT NULL,
            change_percent REAL NOT NULL,
            top_stock TEXT NOT NULL,
            last_updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )`);

        db.run(`CREATE TABLE IF NOT EXISTS portfolio (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            user_id INTEGER NOT NULL,
            company_id INTEGER NOT NULL,
            shares REAL NOT NULL,
            avg_price REAL NOT NULL,
            FOREIGN KEY (user_id) REFERENCES users (id),
            FOREIGN KEY (company_id) REFERENCES companies (id)
        )`);

        db.run(`CREATE TABLE IF NOT EXISTS transactions (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            user_id INTEGER NOT NULL,
            company_id INTEGER NOT NULL,
            type TEXT CHECK(type IN ('BUY', 'SELL')) NOT NULL,
            shares REAL NOT NULL,
            price REAL NOT NULL,
            total_amount REAL NOT NULL,
            transaction_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (user_id) REFERENCES users (id),
            FOREIGN KEY (company_id) REFERENCES companies (id)
        )`);

        db.run(`CREATE TABLE IF NOT EXISTS uac_reports (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            user_id INTEGER NOT NULL,
            report_type TEXT NOT NULL,
            period TEXT NOT NULL,
            file_path TEXT NOT NULL,
            generated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (user_id) REFERENCES users (id)
        )`);

        // Insert sample data if tables are empty
        db.get("SELECT COUNT(*) as count FROM companies", (err, row) => {
            if (row.count === 0) {
                console.log('Inserting sample company data...');
                const companies = require('./sample-data/companies.json');
                const stmt = db.prepare("INSERT INTO companies (symbol, name, sector, current_price, change_percent, volume) VALUES (?, ?, ?, ?, ?, ?)");
                companies.forEach(company => {
                    stmt.run(company.symbol, company.name, company.sector, company.current_price, company.change_percent, company.volume);
                });
                stmt.finalize();
            }
        });

        db.get("SELECT COUNT(*) as count FROM sectors", (err, row) => {
            if (row.count === 0) {
                console.log('Inserting sample sector data...');
                const sectors = require('./sample-data/sectors.json');
                const stmt = db.prepare("INSERT INTO sectors (name, weightage, change_percent, top_stock) VALUES (?, ?, ?, ?)");
                sectors.forEach(sector => {
                    stmt.run(sector.name, sector.weightage, sector.change_percent, sector.top_stock);
                });
                stmt.finalize();
            }
        });
    });
}

// Middleware
app.use(express.json());
app.use(express.static(path.join(__dirname, 'public')));

// API Routes
app.get('/api/companies', (req, res) => {
    db.all("SELECT * FROM companies ORDER BY symbol", [], (err, rows) => {
        if (err) {
            res.status(500).json({ error: err.message });
            return;
        }
        res.json(rows);
    });
});

app.get('/api/sectors', (req, res) => {
    db.all("SELECT * FROM sectors ORDER BY name", [], (err, rows) => {
        if (err) {
            res.status(500).json({ error: err.message });
            return;
        }
        res.json(rows);
    });
});

app.get('/api/market-summary', (req, res) => {
    db.get("SELECT SUM(volume) as total_volume, SUM(current_price * volume) as total_value FROM companies", [], (err, row) => {
        if (err) {
            res.status(500).json({ error: err.message });
            return;
        }
        res.json({
            volume: row.total_volume,
            value: row.total_value
        });
    });
});

app.get('/api/uac-reports/:userId', (req, res) => {
    db.all("SELECT * FROM uac_reports WHERE user_id = ? ORDER BY generated_at DESC", [req.params.userId], (err, rows) => {
        if (err) {
            res.status(500).json({ error: err.message });
            return;
        }
        res.json(rows);
    });
});

// Serve HTML files
app.get(['/', '/dashboard'], (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.get('/psx-companies', (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'psx-companies.html'));
});

app.get('/sector-analysis', (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'sector-analysis.html'));
});

app.get('/uac-reports', (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'uac-reports.html'));
});

// Start server
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
});

process.on('SIGINT', () => {
    db.close();
    process.exit();
});
```

<<<<<<< PROJECT_NAME_START Stockfolio PKX >>>>>>> PROJECT_NAME_END