diff --git a/contrib/gana b/contrib/gana
index fa6373d8e..836cdc706 160000
--- a/contrib/gana
+++ b/contrib/gana
@@ -1 +1 @@
-Subproject commit fa6373d8e2432cd63da881e05f4100240e688cdf
+Subproject commit 836cdc706d849ec5965b3b7795fcefe95344a969
diff --git a/src/exchange/taler-exchange-httpd_refreshes_reveal.c b/src/exchange/taler-exchange-httpd_refreshes_reveal.c
index 19c126f7e..8b48e67fd 100644
--- a/src/exchange/taler-exchange-httpd_refreshes_reveal.c
+++ b/src/exchange/taler-exchange-httpd_refreshes_reveal.c
@@ -768,6 +768,7 @@ clean_age:
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Signatures ready, starting DB interaction\n");
 
+  // FIXME: do all this (and the above) in ONE DB transaction!
   /* Persist operation result in DB */
   {
     enum GNUNET_DB_QueryStatus qs;