feat: Register db_worker task in main.py lifespan

backend/app/main.py

@@ -18,6 +18,7 @@ import pytz
 from app.core.config import settings
 from app.api import api_router
 from app.services.websocket_manager import websocket_manager
+from app.services.db_worker import db_writer_worker
 from app.core.database import engine, Base, AsyncSessionLocal
 from app.models import models  # 모델 임포트
 from app.core.market_schedule import is_market_open
@@ -315,6 +316,9 @@ async def lifespan(app: FastAPI):
     except Exception as e:
         logger.warning(f"⚠️ 데이트레이딩 포지션 복구 실패 (non-critical): {e}")
 
+    # 워커 시작 (스케줄러 및 API 요청 처리 전 큐 준비)
+    app.state.db_worker_task = asyncio.create_task(db_writer_worker())
+
     # 스케줄러 시작
     app.state.auto_trade_task = asyncio.create_task(auto_trade_scheduler())
     app.state.batch_analysis_task = asyncio.create_task(batch_analysis_scheduler())
@@ -324,7 +328,7 @@ async def lifespan(app: FastAPI):
 
     # 종료 시 정리 작업
     # 스케줄러 중단
-    for task_attr in ("auto_trade_task", "batch_analysis_task", "day_trade_task"):
+    for task_attr in ("auto_trade_task", "batch_analysis_task", "day_trade_task", "db_worker_task"):
         try:
             task = getattr(app.state, task_attr, None)
             if task: