diff --git a/internal/http/api_handlers.go b/internal/http/api_handlers.go
index 0300313..f5de1ca 100644
--- a/internal/http/api_handlers.go
+++ b/internal/http/api_handlers.go
@@ -250,6 +250,10 @@ func (h *MindflowApiHandlers) New(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if err := h.db.DeleteUnusedCategories(); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+
 	http.Redirect(w, r, "/mindflow/admin", http.StatusMovedPermanently)
 }
 
@@ -305,11 +309,20 @@ func (h *MindflowApiHandlers) Edit(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
+
+	if err := h.db.DeleteUnusedCategories(); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
 }
 
 func (h *MindflowApiHandlers) Delete(w http.ResponseWriter, r *http.Request) {
 	id, _ := strconv.ParseInt(GetURLParam(r, "id"), 10, 64)
 	if err := h.db.Delete(id); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if err := h.db.DeleteUnusedCategories(); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 }