feat(infrastructure): use celery worker

backend/app/celery_app.py

@@ -1,8 +1,6 @@
 import os
 from celery import Celery
 
-# Reuse existing RabbitMQ configuration env vars with vhost and optional TLS support
-# If RABBITMQ_URL is provided, it takes precedence. Otherwise compose from parts.
 if os.getenv("RABBITMQ_URL"):
     RABBITMQ_URL = os.getenv("RABBITMQ_URL")  # type: ignore
 else:
@@ -27,26 +25,19 @@ else:
     if vhost in ("/", "") and not RABBITMQ_URL.endswith("//"):
         RABBITMQ_URL += "/"
 
-# Default queue name to keep parity with the previous worker
 DEFAULT_QUEUE = os.getenv("MAIL_QUEUE", "mail_queue")
 
-# Use RPC backend by default to avoid coupling to Redis
 CELERY_BACKEND = os.getenv("CELERY_BACKEND", "rpc://")
 
 celery_app = Celery(
     "app",
     broker=RABBITMQ_URL,
-    backend=CELERY_BACKEND,
-    include=[
-        "app.workers.celery_tasks",
-    ],
+    # backend=CELERY_BACKEND,
 )
+celery_app.autodiscover_tasks(["app.workers"], related_name="celery_tasks")  # discover app.workers.celery_tasks
 
-# Ensure this Celery app becomes the default for producers (e.g., FastAPI process)
-# so that @shared_task.delay(...) uses the same broker/credentials as the worker.
 celery_app.set_default()
 
-# Basic, safe defaults – single prefetch helps fairness similarly to the old worker
 celery_app.conf.update(
     task_default_queue=DEFAULT_QUEUE,
     task_acks_late=True,
@@ -54,8 +45,6 @@ celery_app.conf.update(
     task_serializer="json",
     result_serializer="json",
     accept_content=["json"],
-    broker_heartbeat=0,  # let kombu handle heartbeats robustly in some envs
 )
 
-# Expose a shortcut for Celery CLI discovery: `celery -A app.celery_app worker ...`
 __all__ = ["celery_app"]