Don't use indexes in test data as postgres complains over duplicate keys.

tests/data/db_structure.xml

@@ -175,47 +175,6 @@
      <length>255</length>
     </field>
 
-    <index>
-     <name>uid_index</name>
-     <field>
-      <name>uid</name>
-      <sorting>ascending</sorting>
-     </field>
-    </index>
-
-    <index>
-     <name>type_index</name>
-     <field>
-      <name>type</name>
-      <sorting>ascending</sorting>
-     </field>
-    </index>
-
-    <index>
-     <name>category_index</name>
-     <field>
-      <name>category</name>
-      <sorting>ascending</sorting>
-     </field>
-    </index>
-
-    <index>
-     <name>uid_type_category_index</name>
-     <unique>true</unique>
-     <field>
-      <name>uid</name>
-      <sorting>ascending</sorting>
-     </field>
-     <field>
-      <name>type</name>
-      <sorting>ascending</sorting>
-     </field>
-     <field>
-      <name>category</name>
-      <sorting>ascending</sorting>
-     </field>
-    </index>
-
   </declaration>
  </table>