Re-learning how to install Postgres (*Sigh)

CREATE DATABASE officehours;
CREATE USER officehours;
ALTER USER officehours WITH UNENCRYPTED PASSWORD '<password>';
ALTER USER officehours LOGIN;
GRANT ALL PRIVILEGES ON DATABASE officehours TO officehours;

-- Been a while since I used Postgres.  I'd forgotten that Postgres
-- thinks in terms of privileged connections.  It makes sense, certainly
-- better than MySQL.
\CONNECT officehours;

-- Enable case-insensitive matches on some text columns, good for email
CREATE EXTENSION citext; 
CREATE EXTENSION btree_gist; 
CREATE EXTENSION plv8; 

#

What can I do?
    1) Add users and make them clients.
    2) Add users and make them staff.
    3) Allocate a block of time as "office hours"
    4) Allocate a block of time as an "appointment."

NEXT: Psycopg2

** Progress: Everything works in psycopg2 EXCEPT add_appointment, which
is very distressing.  Really, _really_ don't want to take that
functionality and put it into the middle tier.  It's rock-solid business
logic; it belongs in the database as a constraint.