This module allows user authentication (and can log authentication requests) against information stored in a PostgreSQL database. * Authentication One database, and one (or two) tables. One table holds the username and the encrypted (or plain) password. The other table holds the username and the names of the group to which the user belongs. It is possible to have username, groupname and password in the same table. * Access Logging Every authentication access is logged in the same database of the authentication table, but in different table. User name and date of the request are logged. As option, it can log password, ip address, request line.