دليل هندسي: Hire a Freelance Django & Celery Programmer for Idempotent Distributed Queues. ألديان فازريهادي (Aldian Fazrihady) مبرمج مستقل أول ومهندس ذكاء اصطناعي (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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