observe-hook: warm up caches in +on-init also, not just +on-load
(act [%watch %group-store /groups %group-on-leave])
(act [%watch %group-store /groups %group-on-remove-member])
(act [%watch %metadata-store /updates %md-on-add-group-feed])
+ (act [%warm-cache-all ~])
==
::
++ act
