```php
<?php
$id = $_GET['id'] ?? 0;
try {
    $conn = new PDO("mysql:host=localhost;dbname=bhbm_service", "username", "password");
    $stmt = $conn->prepare("DELETE FROM service_records WHERE id = ?");
    $stmt->execute([$id]);
    header("Location: service_records.php");
    exit();
} catch(PDOException $e) {
    die("Database error: " . $e->getMessage());
}
?>
```

You'll also need to create these database tables:

```sql
CREATE DATABASE bhbm_service;

CREATE TABLE service_records (
    id INT AUTO_INCREMENT PRIMARY KEY,
    client_name VARCHAR(100) NOT NULL,
    contact_number VARCHAR(20) NOT NULL,
    equipment_type VARCHAR(50) NOT NULL,
    brand VARCHAR(50) NOT NULL,
    serial_number VARCHAR(50),
    issue_description TEXT NOT NULL,
    service_date DATE NOT NULL,
    technician VARCHAR(50) NOT NULL,
    service_notes TEXT,
    status VARCHAR(20) DEFAULT 'Completed',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE service_requests (
    id INT AUTO_INCREMENT PRIMARY KEY,
    customer_name VARCHAR(100) NOT NULL,
    customer_email VARCHAR(100) NOT NULL,
    customer_phone VARCHAR(20) NOT NULL,
    customer_company VARCHAR(100),
    equipment_type VARCHAR(50) NOT NULL,
    brand VARCHAR(50) NOT NULL,
    model VARCHAR(50),
    issue_description TEXT NOT NULL,
    contact_method VARCHAR(20) NOT NULL,
    status VARCHAR(20) DEFAULT 'New',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
```