SQL: looks like this column is used for objectId instead of itemId.

datapack_development/sql/character_offline_trade_items.sql

 CREATE TABLE IF NOT EXISTS `character_offline_trade_items` (
   `charId` int(10) unsigned NOT NULL DEFAULT '0',
-  `item` smallint(5) unsigned NOT NULL DEFAULT '0',
+  `item` int(10) unsigned NOT NULL DEFAULT '0', -- ObjectId
   `count` bigint(20) unsigned NOT NULL DEFAULT '0',
   `price` bigint(20) unsigned NOT NULL DEFAULT '0'
 );
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datapack_development/sql/updates/20110112update.sql

 ALTER TABLE `character_offline_trade_items`
 MODIFY `charId` int(10) unsigned NOT NULL DEFAULT '0',
-MODIFY `item` smallint(5) unsigned NOT NULL DEFAULT '0',
+MODIFY `item` int(10) unsigned NOT NULL DEFAULT '0',
 MODIFY `count` bigint(20) unsigned NOT NULL DEFAULT '0',
 MODIFY `price` bigint(20) unsigned NOT NULL DEFAULT '0',
 DROP PRIMARY KEY;
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