diff --git a/internal/modules/daily-checklists/services/daily-checklist.service.go b/internal/modules/daily-checklists/services/daily-checklist.service.go
index 24aeb471..91f43d06 100644
--- a/internal/modules/daily-checklists/services/daily-checklist.service.go
+++ b/internal/modules/daily-checklists/services/daily-checklist.service.go
@@ -1030,6 +1030,7 @@ func (s *dailyChecklistService) UpdateByPut(c *fiber.Ctx, req *validation.Create
 		}
 	}
 
+	var wasBranchC bool // non-empty_kandang → empty_kandang transition
 	err = s.Repository.DB().WithContext(c.Context()).Transaction(func(tx *gorm.DB) error {
 		if err := s.lockKandangForChecklistCreation(tx, req.KandangId); err != nil {
 			return err
@@ -1088,6 +1089,23 @@ func (s *dailyChecklistService) UpdateByPut(c *fiber.Ctx, req *validation.Create
 			if err := s.upsertEmptyKandangRange(tx, id, req.KandangId, date, emptyEndDate, actorID); err != nil {
 				return err
 			}
+			// Branch C: non-empty → empty_kandang, hard-delete task/progress data
+			if !existingIsEmpty {
+				wasBranchC = true
+				if err := tx.Exec(`
+					DELETE FROM daily_checklist_activity_task_assignments
+					WHERE task_id IN (
+						SELECT id FROM daily_checklist_activity_tasks WHERE checklist_id = ?
+					)`, id).Error; err != nil {
+					return err
+				}
+				if err := tx.Where("checklist_id = ?", id).Delete(&entity.DailyChecklistActivityTask{}).Error; err != nil {
+					return err
+				}
+				if err := tx.Where("daily_checklist_id = ?", id).Delete(&entity.DailyChecklistTask{}).Error; err != nil {
+					return err
+				}
+			}
 		} else if existingIsEmpty {
 			updates := map[string]any{
 				"deleted_at": time.Now(),
@@ -1108,6 +1126,20 @@ func (s *dailyChecklistService) UpdateByPut(c *fiber.Ctx, req *validation.Create
 		return nil, err
 	}
 
+	// Branch C: delete DC documents outside transaction (storage is external)
+	if wasBranchC && s.DocumentSvc != nil {
+		docs, docErr := s.DocumentSvc.ListByTarget(c.Context(), string(utils.DocumentTypeDailyChecklist), uint64(id))
+		if docErr == nil && len(docs) > 0 {
+			docIDs := make([]uint, 0, len(docs))
+			for _, doc := range docs {
+				docIDs = append(docIDs, doc.Id)
+			}
+			if delErr := s.DocumentSvc.DeleteDocuments(c.Context(), docIDs, true); delErr != nil {
+				s.Log.Errorf("Failed to delete documents for DC %d during empty_kandang conversion: %+v", id, delErr)
+			}
+		}
+	}
+
 	return s.GetOne(c, id)
 }