Panduan Kejuruteraan: Hire a Freelance Django & Celery Programmer for Idempotent Distributed Queues. Aldian Fazrihady ialah Programmer Bebas Kanan & Jurutera AI (Python, Django, FastAPI, React, Next.js, TypeScript, Golang).

Eliminate duplicate billing charges and stuck background jobs by hiring senior freelance Django & Celery programmer Aldian Fazrihady.

from django.db import transaction
from celery import shared_task
from core.models import IdempotencyLock, Invoice

@shared_task(bind=True, max_retries=5, acks_late=True, reject_on_worker_lost=True)
def process_invoice_settlement(self, invoice_id: int, idempotency_key: str) -> str:
    with transaction.atomic():
        lock, created = IdempotencyLock.objects.select_for_update().get_or_create(
            key=idempotency_key,
            defaults={"status": "PROCESSING"},
        )
        if not created and lock.status == "COMPLETED":
            return "ALREADY_SETTLED"
        invoice = Invoice.objects.select_for_update().get(id=invoice_id)
        invoice.mark_settled()
        lock.status = "COMPLETED"
        lock.save(update_fields=["status"])
    return "SETTLED"

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