Undefer updated_at in guery_helper
Undefer updated_at in guery_helper

_get_last_modified function in services/query_helper was fetching the
updated_at column from the database for every object in the loop. For
the object count query on all objects page on grc-test this resulted in
over 14k queries to the database just to fetch the updated_at column
for every object.

I believe this simple code change will reduce the request time for
fetching object counts from minutes to just a couple of seconds at most.

AleksNeStu/ggrc-core,j0gurt/ggrc-core,selahssea/ggrc-core,josthkko/ggrc-core,josthkko/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,plamut/ggrc-core,VinnieJohns/ggrc-core,selahssea/ggrc-core,plamut/ggrc-core,j0gurt/ggrc-core,VinnieJohns/ggrc-core,andrei-karalionak/ggrc-core,VinnieJohns/ggrc-core,andrei-karalionak/ggrc-core,VinnieJohns/ggrc-core,j0gurt/ggrc-core,j0gurt/ggrc-core,selahssea/ggrc-core,andrei-karalionak/ggrc-core,andrei-karalionak/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,josthkko/ggrc-core,josthkko/ggrc-core,AleksNeStu/ggrc-core,selahssea/ggrc-core