Remove legacy "touched" table and indexing

Summary: Noticed this in the schema. "Touches" were an idea that never really got off the ground, as we built out more/better notification channels instead. Essentially, they recorded any object you'd ever interacted with. Maybe this will be useful some day, but for now it does nothing and can't be interacted with. Nuke it.

Test Plan: `grep`, loaded Maniphest.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6953

resources/sql/patches/20130912.maniphest.1.touch.sql

···
+DROP TABLE IF EXISTS {$NAMESPACE}_maniphest.maniphest_touch;

src/applications/differential/search/DifferentialSearchIndexer.php

···
       ->withNotDraft(true)
       ->execute();
 
-    $touches = array();
-
     foreach (array_merge($comments, $inlines) as $comment) {
       if (strlen($comment->getContent())) {
         $doc->addField(
           PhabricatorSearchField::FIELD_COMMENT,
           $comment->getContent());
       }
-
-      $author = $comment->getAuthorPHID();
-      $touches[$author] = $comment->getDateCreated();
-    }
-
-    foreach ($touches as $touch => $time) {
-      $doc->addRelationship(
-        PhabricatorSearchRelationship::RELATIONSHIP_TOUCH,
-        $touch,
-        PhabricatorPeoplePHIDTypeUser::TYPECONST,
-        $time);
     }
 
     $rev->loadRelationships();

src/applications/maniphest/search/ManiphestSearchIndexer.php

···
       $task->getID());
 
     $current_ccs = $task->getCCPHIDs();
-    $touches = array();
     $owner = null;
     $ccs = array();
     foreach ($transactions as $transaction) {
···
       }
 
       $author = $transaction->getAuthorPHID();
-
-      // Record the most recent time they touched this object.
-      $touches[$author] = $transaction->getDateCreated();
 
       switch ($transaction->getTransactionType()) {
         case ManiphestTransactionType::TYPE_OWNER:
···
         $owner
           ? $owner->getDateCreated()
           : $task->getDateCreated());
-    }
-
-    foreach ($touches as $touch => $time) {
-      $doc->addRelationship(
-        PhabricatorSearchRelationship::RELATIONSHIP_TOUCH,
-        $touch,
-        PhabricatorPeoplePHIDTypeUser::TYPECONST,
-        $time);
     }
 
     // We need to load handles here since non-users may subscribe (mailing

src/applications/search/constants/PhabricatorSearchRelationship.php

···
   const RELATIONSHIP_REPOSITORY = 'repo';
 
   const RELATIONSHIP_OPEN       = 'open';
-  const RELATIONSHIP_TOUCH      = 'poke';
 
 }

src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php

···
         'name' =>
           $this->getPatchPath('20130820.file-mailkey-populate.php'),
       ),
+      '20130912.maniphest.1.touch.sql' => array(
+        'type' => 'sql',
+        'name' => $this->getPatchPath('20130912.maniphest.1.touch.sql'),
+      ),
     );
   }
 }