def send_welcome_email(user_email):
    """Background task - sends email"""
    http.post("https://api.sendgrid.com/send", json={
        "to": user_email,
        "template": "welcome"
    })

def main():
    email = req.get("email")
    db.create_document("users", {"email": email})
    
    # Queue email (runs after return)
    queue.add("send_welcome_email", user_email=email)
    
    # Returns immediately
    return {"success": True}

def main():
    order_id = create_order()

    # Call another deployed function in background
    queue.call_function("email-service",
                       template="order_confirmation",
                       order_id=order_id)

    queue.call_function("inventory-service",
                       action="reserve",
                       order_id=order_id)

    return {"order_id": order_id}

queue.add("process_data",
         user_id="123",
         action="update")

queue.call_function("analytics-service",
                   event="signup",
                   user_id="123")

def risky_task(user_id):
    try:
        result = http.post("https://api.example.com/notify",
                         json={"user_id": user_id})
        print(f"Success: {user_id}")
    except Exception as e:
        print(f"Task failed: {e}")
        db.create_document("failed_tasks", {
            "user_id": user_id
        })

def main():
    email = req.get("email")
    user_id = create_user(email)

    queue.add("send_welcome_email", email=email)
    queue.add("create_preferences", user_id=user_id)
    queue.add("track_signup", user_id=user_id)

    return {"user_id": user_id}

def main():
    order_id = create_order(req.get("items"))

    queue.add("send_confirmation", order_id=order_id)
    queue.add("reserve_inventory", order_id=order_id)
    queue.call_function("shipping-service", order_id=order_id)

    return {"order_id": order_id}