Trackback Postgres support

Here's the postgres module for trackback - have fun.

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CREATE TABLE trackback_received (
nid integer NOT NULL,
cid integer NOT NULL,
url varchar(255) NOT NULL default '',
PRIMARY KEY (nid, cid)
);

CREATE TABLE trackback_sent (
nid integer NOT NULL,
url varchar(255) NOT NULL default '',
successful smallint NOT NULL,
PRIMARY KEY (nid, url)
);

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