create user and assign to database postgres code example
Example 1: create db user postgres
sudo -u postgres psql
postgres=# create database mydb;
postgres=# create user myuser with encrypted password 'mypass';
postgres=# grant all privileges on database mydb to myuser;
Example 2: psql create user
# https://www.postgresql.org/docs/8.0/sql-createuser.html
CREATE USER WITH PASSWORD '' VALID UNTIL '';