Create a database and user
These are the basic steps to create a new database and user for your applications:
Create a new role by executing the createuser command. With the options below, the new role will not be a superuser and will not have privileges for creating new databases or new roles (this is usually the default for the createuser command).
$ createuser -U postgres USER_NAME -S -D -R -P
You will be prompted to enter first the password for the new role and to reenter it, and then to enter the postgres role password.
Create a new database with the new role as the owner:
$ createdb -U postgres DATABASE_NAME -O USER_NAME