--- blogapi.install.PK_NotNull	2008-11-02 23:47:57.000000000 -0500
+++ blogapi.install	2008-11-02 23:48:34.000000000 -0500
@@ -29,6 +29,7 @@ function blogapi_schema() {
       'fid' => array(
         'description' => t('Primary Key: Unique file ID.'),
         'type' => 'serial',
+        'not null' => TRUE,
       ),
       'uid' => array(
         'description' => t('The {users}.uid of the user who is associated with the file.'),