diff -ur feeds/feeds.install feeds_/feeds.install
--- feeds/feeds.install	2011-12-22 23:29:09.000000000 +0400
+++ feeds_/feeds.install	2011-12-27 14:58:36.000000000 +0400
@@ -517,3 +517,20 @@
   db_add_index('feeds_item', 'global_lookup_url', array('entity_type', array('url', 128)));
   db_add_index('feeds_item', 'global_lookup_guid', array('entity_type', array('guid', 128)));
 }
+
+
+function feeds_update_7210() {
+  db_change_field('feeds_source', 'state', 'state', array(
+        'type' => 'blob',
+        'not null' => FALSE,
+        'description' => 'State of import or clearing batches.',
+        'serialize' => TRUE,
+  ));
+
+  db_change_field('feeds_source', 'fetcher_result', 'fetcher_result', array(
+        'type' => 'blob',
+        'not null' => FALSE,
+        'description' => 'Cache for fetcher result.',
+        'serialize' => TRUE,
+  ));
+}