managing users postgresql

our component run internal network some-more 50 clients bond same internal server. formulating db user any client, take advantage postgresql boon system.

1) examining "performance", the ok have ~ 50 db users instead reimplementing tradition system?

2) (solved) user check (what sql statement) assent table?

solution:

select has_table_privilege('user','table','insert')

i move reimplement system, given good confidence component isn't excusable implement.