[EDIT] courseIdによる削除クエリを追加しました。

src/main/java/com/example/demo/app/infra/repository/AllocationRepository.java

@@ -3,6 +3,7 @@ package com.example.demo.app.infra.repository;
 import java.util.List;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 
 import com.example.demo.app.domain.model.CourseInfoModel;
@@ -29,4 +30,8 @@ public interface AllocationRepository extends JpaRepository<AllocationEntity, Al
 			+ " a.categoryEntity.categoryId ASC ")
 	List<CourseInfoModel> findAllJoinedAllocation();
 	
+	@Modifying
+	@Query("delete from AllocationEntity a where a.courseEntity.courseId = :courseId")
+	void deleteByCourseId(Long courseId);
+
 }

src/main/java/com/example/demo/app/infra/repository/CourseOwnerRepository.java

@@ -1,9 +1,15 @@
 package com.example.demo.app.infra.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
 
 import com.example.demo.app.infra.entity.CourseOwnerEntity;
 
 public interface CourseOwnerRepository extends JpaRepository<CourseOwnerEntity, Long>{
 
+	@Modifying
+	@Query("delete from CourseOwnerEntity c where c.courseEntity.courseId = :courseId")
+	public void deleteByCourseId(Long courseId);
+	
 }