@Override
        public String getName() { return "postgresql-user-password-history-size"; }
The property which specifies the number of previous passwords remembered
for each user. If set to zero, the default, then this restriction does
not apply.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLPasswordPolicy.java