未知（继上次中断）

backend/app/crud/study.py

@@ -114,7 +114,6 @@ async def delete(db: AsyncSession, study_id: uuid.UUID) -> None:
     from app.models.faq_category import FaqCategory
     from app.models.faq_item import FaqItem
     from app.models.faq_reply import FaqReply
-    from app.models.workflow_template import WorkflowTemplate
     
     # 按依赖关系顺序删除关联数据
     # 1. 删除审计日志
@@ -128,10 +127,7 @@ async def delete(db: AsyncSession, study_id: uuid.UUID) -> None:
     # 3. 删除知识库
     await db.execute(sa_delete(KnowledgeNote).where(KnowledgeNote.study_id == study_id))
     
-    # 4. 删除工作流模板
-    await db.execute(sa_delete(WorkflowTemplate).where(WorkflowTemplate.trial_id == study_id))
-    
-    # 5. 删除启动相关
+    # 4. 删除启动相关
     await db.execute(sa_delete(KickoffMeeting).where(KickoffMeeting.study_id == study_id))
     await db.execute(sa_delete(StartupEthics).where(StartupEthics.study_id == study_id))
     await db.execute(sa_delete(StartupFeasibility).where(StartupFeasibility.study_id == study_id))