Keep Tahoe Incident Reports as long as our logs

nixos/modules/private-storage.nix

@@ -17,7 +17,7 @@ let
   #
   # NOTE: This is promised by the service privacy policy.  It *may not* be
   # raised without following the process for updating the privacy policy.
-  max-incident-age = "29d";
+  max-incident-age = toString(config.services.private-storage.monitoring.policy.logRetentionSeconds) + "s";
 
   fqdn = "${
     assert config.networking.hostName != null; config.networking.hostName