PostgreSQL support

I tried to get PostgreSQL support in this module, and I did some modifs in the files legal.install and legal.module

legal.install
Add a switch case for pgsql
case 'pgsql':
$query1 = db_query("CREATE TABLE {legal_accepted} (
legal_id serial,
uid int NOT NULL default '0',
tc_id int NOT NULL default '0',
accepted int NOT NULL default '0',
PRIMARY KEY (legal_id)

) ");

$query2 = db_query("CREATE TABLE {legal_conditions} (
tc_id serial,
conditions text NOT NULL,
date integer NOT NULL default '0',
extras text,
changes text,
PRIMARY KEY (tc_id)
) ");

----

In the file legal.module, I had to change some INSERT statemets, as I saw they tried to insert always NULL into the primary Keys
i don't know how this change would affect to MySQL, as I don't understand much how it worked.
These are the diff changes from 4.7.0 version

[root@outeiro legal]# diff legal.module legal.module.bkp
300c300
< db_query("INSERT INTO {legal_conditions} ( conditions, date, extras, changes) VALUES ( '%s', %d, '%s', '%s')", $form_values['conditions'], time(), serialize($form_values['extras']), $form_values['changes']);
---
> db_query("INSERT INTO {legal_conditions} (tc_id, conditions, date, extras, changes) VALUES (NULL, '%s', %d, '%s', '%s')", $form_values['conditions'], time(), serialize($form_values['extras']), $form_values['changes']);
623c623
< db_query("INSERT INTO {legal_accepted} ( uid, tc_id, accepted) VALUES ( '%d', '%d', '%d')", $uid, $tc_id, time());
---
> db_query("INSERT INTO {legal_accepted} (legal_id, uid, tc_id, accepted) VALUES (NULL, '%d', '%d', '%d')", $uid, $tc_id, time());
[root@outeiro legal]#

As you can see the change is two INSERT INTO lines, removing the attempt to insert NULL in the legal_id and tc_id fields, as they are serial (autoincrement)