Increase the length of {aggregator_feed}.url.
function aggregator_update_7003() {
db_drop_unique_key('aggregator_feed', 'url');
db_change_field('aggregator_feed', 'url', 'url', array(
'type' => 'text',
'not null' => TRUE,
'description' => 'URL to the feed.',
));
db_change_field('aggregator_feed', 'link', 'link', array(
'type' => 'text',
'not null' => TRUE,
'description' => 'The parent website of the feed; comes from the <link> element in the feed.',
));
db_change_field('aggregator_item', 'link', 'link', array(
'type' => 'text',
'not null' => TRUE,
'description' => 'Link to the feed item.',
));
db_change_field('aggregator_item', 'guid', 'guid', array(
'type' => 'text',
'not null' => TRUE,
'description' => 'Unique identifier for the feed item.',
));
db_add_index('aggregator_feed', 'url', array(
array(
'url',
255,
),
));
}