refactor(db): index for grants_user

issue #1271

lib/Ravada.pm

@@ -885,6 +885,7 @@ sub _add_indexes_generic($self) {
         ]
         ,grants_user => [
             "index(id_user,id_grant)"
+            ,"index(id_user)"
         ]
         ,iptables => [
             "index(id_domain,time_deleted,time_req)"