add sub-category deletion endpoint for course management

Introduce a compatibility delete route and handler for course sub-categories and cascade-delete their linked courses to support admin content cleanup flows.

Made-with: Cursor

gen/db/compat_course_management.go

@@ -166,3 +166,13 @@ RETURNING id, category_id, title, description, is_active, thumbnail, intro_video
 	}
 	return i, nil
 }
+
+func (q *Queries) DeleteCourseSubCategoryCompat(ctx context.Context, subCategoryID int64) error {
+	_, err := q.db.Exec(ctx, `DELETE FROM courses WHERE sub_category_id = $1`, subCategoryID)
+	if err != nil {
+		return err
+	}
+
+	_, err = q.db.Exec(ctx, `DELETE FROM course_sub_categories WHERE id = $1`, subCategoryID)
+	return err
+}

internal/web_server/handlers/hierarchy_handler.go

@@ -569,6 +569,19 @@ func (h *Handler) CreateCourseSubCategory(c *fiber.Ctx) error {
 	return c.Status(fiber.StatusCreated).JSON(domain.Response{Message: "Course sub-category created", Data: created})
 }
 
+func (h *Handler) DeleteCourseSubCategory(c *fiber.Ctx) error {
+	subCategoryID, err := strconv.ParseInt(c.Params("subCategoryId"), 10, 64)
+	if err != nil || subCategoryID <= 0 {
+		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{Message: "Invalid sub-category ID", Error: "subCategoryId must be a positive integer"})
+	}
+
+	if err := h.analyticsDB.DeleteCourseSubCategoryCompat(c.Context(), subCategoryID); err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{Message: "Failed to delete sub-category", Error: err.Error()})
+	}
+
+	return c.JSON(domain.Response{Message: "Course sub-category deleted"})
+}
+
 // CreateLevel godoc
 // @Summary Create level
 // @Description Creates a CEFR level under a course

internal/web_server/routes.go

@@ -89,6 +89,7 @@ func (a *App) initAppRoutes() {
 	groupV1.Get("/course-management/human-language/hierarchy", a.authMiddleware, a.RequirePermission("learning_tree.get"), h.UnifiedHierarchy)
 	groupV1.Get("/course-management/courses/:courseId/hierarchy", a.authMiddleware, a.RequirePermission("learning_tree.get"), h.UnifiedHierarchyByCourse)
 	groupV1.Post("/course-management/sub-categories", a.authMiddleware, a.RequirePermission("course_categories.create"), h.CreateCourseSubCategory)
+	groupV1.Delete("/course-management/sub-categories/:subCategoryId", a.authMiddleware, a.RequirePermission("course_categories.delete"), h.DeleteCourseSubCategory)
 	groupV1.Post("/course-management/levels", a.authMiddleware, a.RequirePermission("subcourses.create"), h.CreateLevel)
 	groupV1.Post("/course-management/modules", a.authMiddleware, a.RequirePermission("subcourses.create"), h.CreateModule)
 	groupV1.Post("/course-management/sub-modules", a.authMiddleware, a.RequirePermission("subcourses.create"), h.CreateSubModule)