Stabilize worker sync flow

iaai_scraper/worker/celery_app.py

@@ -4,11 +4,13 @@ import logging
 
 from celery import Celery
 from celery.signals import worker_process_init, worker_ready, setup_logging as celery_setup_logging
+from redis import Redis
 
 from ..core.config import settings
 from ..core.logs import setup_logging
 
 logger = logging.getLogger("iaai_scraper.worker.celery_app")
+STARTUP_SYNC_DISPATCH_KEY = "iaai:state:startup_sync_dispatched"
 
 
 @celery_setup_logging.connect
@@ -96,6 +98,24 @@ celery_app.autodiscover_tasks(["iaai_scraper.worker"])
 def _on_worker_ready(**kwargs):
     """Сразу при старте worker отправляем первую задачу sync_listing,
     чтобы не ждать час до первого beat-цикла."""
+    try:
+        redis_client = Redis.from_url(
+            settings.redis.url,
+            decode_responses=True,
+            socket_connect_timeout=settings.redis.socket_connect_timeout_seconds,
+            socket_timeout=settings.redis.socket_timeout_seconds,
+            health_check_interval=settings.redis.health_check_interval_seconds,
+            retry_on_timeout=True,
+        )
+        should_dispatch = bool(redis_client.set(STARTUP_SYNC_DISPATCH_KEY, "1", nx=True, ex=600))
+    except Exception:
+        logger.warning("Worker ready startup sync dedupe check failed; skipping immediate dispatch", exc_info=True)
+        return
+
+    if not should_dispatch:
+        logger.info("Worker ready immediate sync already dispatched recently; skipping duplicate enqueue")
+        return
+
     logger.info("Worker ready — dispatching initial sync_listing task")
     celery_app.send_task(
         "iaai_scraper.worker.tasks.sync_listing_task",