add new function replace realtions

dbHandler.go

@@ -387,3 +387,8 @@ func (dH *DBHandler) AddRelation(model, relation any, relationName string) error
 func (dH *DBHandler) DeleteRelation(model, relation any, relationName string) error {
 	return dH.db.Model(model).Association(relationName).Delete(relation)
 }
+
+func (dH *DBHandler) ReplaceRelation(model any, relationName string, data any) error {
+	// .Replace() handles the "Delete missing / Add new" logic for you
+	return dH.db.Model(model).Association(relationName).Replace(data)
+}