Fix #145, add authenticator role to tutorials

tutorials/tut0.rst

@@ -144,13 +144,20 @@ Next make a role to use for anonymous web requests. When a request comes in, Pos
 .. code-block:: postgres
 
   create role web_anon nologin;
-  grant web_anon to postgres;
 
   grant usage on schema api to web_anon;
   grant select on api.todos to web_anon;
 
 The :code:`web_anon` role has permission to access things in the :code:`api` schema, and to read rows in the :code:`todos` table.
 
+It's a good practice to create a dedicated role for connecting to the database, instead of using the highly privileged ``postgres`` role. So we'll do that, name the role ``authenticator`` and also grant him the ability to switch to the ``web_anon`` role :
+
+.. code-block:: postgres
+
+  create role authenticator noinherit login password 'mysecretpassword';
+  grant web_anon to authenticator;
+
+
 Now quit out of psql; it's time to start the API!
 
 .. code-block:: psql
@@ -164,7 +171,7 @@ PostgREST uses a configuration file to tell it how to connect to the database. C
 
 .. code-block:: ini
 
-  db-uri = "postgres://postgres:mysecretpassword@localhost/postgres"
+  db-uri = "postgres://authenticator:mysecretpassword@localhost/postgres"
   db-schema = "api"
   db-anon-role = "web_anon"
 

tutorials/tut1.rst

@@ -16,7 +16,7 @@ The previous tutorial created a :code:`web_anon` role in the database with which
   -- in the previous tutorial
 
   create role todo_user nologin;
-  grant todo_user to postgres;
+  grant todo_user to authenticator;
 
   grant usage on schema api to todo_user;
   grant all on api.todos to todo_user;