Unfortunately, there is no simple database upgrade script, the schema is just too different. Yet, your articles and feed subscriptions may be transferred the following way:
== 1.0.7 ==
1.0.7
=====
* Export your feed subscriptions to OPML
* Copy xml-export.php from TT-RSS 1.1 tarball to your 1.0.7 directory and open it in the browser. This script exports your articles in neutral XML format.
* Save resulting XML file somewhere
* Export your feed subscriptions to OPML
* Copy xml-export.php from TT-RSS 1.1 tarball to your 1.0.7 directory and open it in the browser. This script exports your articles in neutral XML format.
* Save resulting XML file somewhere
Unpack and configure TT-RSS 1.1. You may need to remove old tables manualy
(or choose the different database, etc.)
== 1.1 ==
1.1
===
* Import your feeds OPML
* Run xml-import.php and import your old starred articles
* Import your feeds OPML
* Run xml-import.php and import your old starred articles