change queue_item to use a compound primary key

Breaking up to use multiple queue handlers means we need multiple
queue items for the same notice. So, change the queue_item table to
have a compound pkey, (notice_id,transport).

darcs-hash:20080827211239-84dde-db118799bfd43be62fb02380829c64813c9334f8.gz

classes/Queue_item.php

@@ -11,7 +11,7 @@ class Queue_item extends DB_DataObject
 
     public $__table = 'queue_item';                      // table name
     public $notice_id;                       // int(4)  primary_key not_null
-    public $transport;                       // varchar(8)   not_null
+    public $transport;                       // varchar(8)  primary_key not_null
     public $created;                         // datetime()   not_null
     public $claimed;                         // datetime()  
 

classes/stoica.ini

@@ -154,6 +154,7 @@ claimed = 14
 
 [queue_item__keys]
 notice_id = K
+transport = K
 
 [remember_me]
 code = 130

db/laconica.sql

@@ -233,11 +233,12 @@ create table remember_me (
 
 create table queue_item (
 
-    notice_id integer not null primary key comment 'notice queued' references notice (id),
+    notice_id integer not null comment 'notice queued' references notice (id),
     transport varchar(8) not null comment 'queue for what? "email", "jabber", "sms", "irc", ...',
     created datetime not null comment 'date this record was created',
     claimed datetime comment 'date this item was claimed',
 
+    constraint primary key (notice_id, transport),
     index queue_item_created_idx (created)
 
 ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_bin;