diff --git a/app/workers/study_question_embed_worker.py b/app/workers/study_question_embed_worker.py
index b1bc9be..c48f7f6 100644
--- a/app/workers/study_question_embed_worker.py
+++ b/app/workers/study_question_embed_worker.py
@@ -30,6 +30,10 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from ai.client import AIClient
 from core.database import async_session
 from models.study_question import StudyQuestion
+# StudyQuestion.topic relationship 이 "StudyTopic" 문자열 ref 라서, 별도 process
+# 진입점(예: docker exec python -c) 에서 워커 단독 실행 시 mapper 초기화 실패 방지.
+# 운영 path(main lifespan)는 라우터 import 로 자동 등록되지만 defensive.
+from models.study_topic import StudyTopic  # noqa: F401  # mapper 등록만 필요
 
 logger = logging.getLogger("study_question_embed_worker")