Links request handler accounts to roles.

Definition:

   Column   |       Type        | Collation | Nullable | Default

------------+-------------------+-----------+----------+---------

 role_no    | numeric           |           | not null |

 account_id | character varying |           | not null |

Foreign-key constraints:

    "account_role_account_id_fkey" FOREIGN KEY (account_id) REFERENCES account(account_id)

    "fk_rh_role_no" FOREIGN KEY (role_no) REFERENCES role(role_no)

Columns:

role_no: foreign key into role

account_id: foreign key into account