[GENERAL] Vacuum and state_change

Hi

Had a couple of processes blocking the vacuum so I terminated them using
select pg_terminate_backend(pid);

Running the following
select distinct pid, backend_start, query_start, state_change, state, query from pg_catalog.pg_stat_activity order by
1;
  pid  |         backend_start         |          query_start          |         state_change          | state  |
                                                  query                                                            

-------+-------------------------------+-------------------------------+-------------------------------+--------+--------------------------------------------------------------------------------------------------------------------------
 10677 | 2017-06-09 10:25:49.189848-05 | 2017-06-09 10:33:43.598805-05 | 2017-06-09 10:33:43.599091-05 | idle   |
SELECT1 
 11096 | 2017-06-09 10:27:03.686588-05 | 2017-06-09 10:33:56.28736-05  | 2017-06-09 10:33:56.287364-05 | active |
selectdistinct pid, backend_start, query_start, state_change, state, query from pg_catalog.pg_stat_activity order by 1; 
 13277 | 2017-06-09 07:48:49.506686-05 | 2017-06-09 07:48:52.887185-05 | 2017-06-09 07:48:52.887188-05 | active |
autovacuum:VACUUM csischema.tf_purchased_badge 
 13484 | 2017-06-09 10:31:54.127672-05 | 2017-06-09 10:33:47.137938-05 | 2017-06-09 10:33:47.138226-05 | idle   |
SELECT1 
 16886 | 2017-06-09 07:56:49.033893-05 | 2017-06-09 07:56:49.078369-05 | 2017-06-09 07:56:49.078371-05 | active |
autovacuum:VACUUM csischema.tf_purchases_person 
 25387 | 2017-06-09 05:32:08.079397-05 | 2017-06-09 05:32:08.385728-05 | 2017-06-09 05:32:08.385731-05 | active |
autovacuum:VACUUM csischema.tf_demographic_response_person 
 37465 | 2017-06-09 08:50:58.992002-05 | 2017-06-09 08:51:21.506829-05 | 2017-06-09 08:51:21.506831-05 | active |
autovacuum:VACUUM csischema.tf_transaction_item_person 

I did notice that state_change did not change one bit

Does that mean that something is not quite right with the vacuums ?

Thank you
Armand