#1071 - Specified key was too long; max key length is 1000 bytes -> kills site & possible backups wont work

SQL query:

CREATE TABLE `feeds_item` (
`entity_type` varchar( 64 ) NOT NULL DEFAULT '' COMMENT 'The entity type.',
`entity_id` int( 10 ) unsigned NOT NULL COMMENT 'The imported entity’s serial id.',
`id` varchar( 128 ) NOT NULL DEFAULT '' COMMENT 'The id of the importer that created this item.',
`feed_nid` int( 10 ) unsigned NOT NULL COMMENT 'Node id of the source, if available.',
`imported` int( 11 ) NOT NULL DEFAULT '0' COMMENT 'Import date of the feed item, as a Unix timestamp.',
`url` text NOT NULL COMMENT 'Link to the feed item.',
`guid` text NOT NULL COMMENT 'Unique identifier for the feed item.',
`hash` varchar( 32 ) NOT NULL DEFAULT '' COMMENT 'The hash of the source item.',
PRIMARY KEY ( `entity_type` , `entity_id` ) ,
KEY `id` ( `id` ) ,
KEY `feed_nid` ( `feed_nid` ) ,
KEY `lookup_url` ( `entity_type` , `id` , `feed_nid` , `url` ( 255 ) ) ,
KEY `lookup_guid` ( `entity_type` , `id` , `feed_nid` , `guid` ( 255 ) ) ,
KEY `imported` ( `imported` )
);

MySQL said: Documentation
#1071 - Specified key was too long; max key length is 1000 bytes