Add a missing key to HarbormasterBuildArtifact

Summary: Fixes T10192. This key improves some common queries and is not currently present.

Test Plan: See discussion in T10192. Verified current query plan of real queries is garbage and improved by adding this key.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10192

Differential Revision: https://secure.phabricator.com/D15075

src/applications/harbormaster/storage/build/HarbormasterBuildArtifact.php

@@ -38,6 +38,9 @@ final class HarbormasterBuildArtifact extends HarbormasterDAO
         'key_garbagecollect' => array(
           'columns' => array('artifactType', 'dateCreated'),
         ),
+        'key_target' => array(
+          'columns' => array('buildTargetPHID', 'artifactType'),
+        ),
       ),
     ) + parent::getConfiguration();
   }