diff --git a/resources/sql/patches/20130621.diffcommentphidmig.php b/resources/sql/patches/20130621.diffcommentphidmig.php
index 92fcb6fd09..6a6baf280f 100644
--- a/resources/sql/patches/20130621.diffcommentphidmig.php
+++ b/resources/sql/patches/20130621.diffcommentphidmig.php
@@ -1,23 +1,3 @@
 <?php
 
-$conn = id(new DifferentialRevision())->establishConnection('r');
-
-echo "Assigning transaction PHIDs to DifferentialComments.\n";
-foreach (new LiskRawMigrationIterator($conn, 'differential_comment') as $row) {
-  $id = $row['id'];
-  echo "Migrating comment #{$id}...\n";
-  if ($row['phid']) {
-    continue;
-  }
-
-  queryfx(
-    $conn,
-    'UPDATE %T SET phid = %s WHERE id = %d',
-    'differential_comment',
-    PhabricatorPHID::generateNewPHID(
-      PhabricatorPHIDConstants::PHID_TYPE_XACT,
-      PhabricatorPHIDConstants::PHID_TYPE_DREV),
-    $id);
-}
-
-echo "Done.\n";
+// This patch is unnecessary and was nuked.
diff --git a/resources/sql/patches/20130621.diffcommentunphid.sql b/resources/sql/patches/20130621.diffcommentunphid.sql
new file mode 100644
index 0000000000..01d57146d6
--- /dev/null
+++ b/resources/sql/patches/20130621.diffcommentunphid.sql
@@ -0,0 +1,5 @@
+ALTER TABLE {$NAMESPACE}_differential.differential_comment
+  DROP phid;
+
+ALTER TABLE {$NAMESPACE}_differential.differential_transaction_comment
+  ADD legacyCommentID INT UNSIGNED;
diff --git a/src/applications/differential/storage/DifferentialComment.php b/src/applications/differential/storage/DifferentialComment.php
index 8182f6a883..401b291b51 100644
--- a/src/applications/differential/storage/DifferentialComment.php
+++ b/src/applications/differential/storage/DifferentialComment.php
@@ -20,12 +20,6 @@ final class DifferentialComment extends DifferentialDAO
 
   private $arbitraryDiffForFacebook;
 
-  public function generatePHID() {
-    return PhabricatorPHID::generateNewPHID(
-      PhabricatorPHIDConstants::PHID_TYPE_XACT,
-      PhabricatorPHIDConstants::PHID_TYPE_DREV);
-  }
-
   public function giveFacebookSomeArbitraryDiff(DifferentialDiff $diff) {
     $this->arbitraryDiffForFacebook = $diff;
     return $this;
@@ -33,7 +27,6 @@ final class DifferentialComment extends DifferentialDAO
 
   public function getConfiguration() {
     return array(
-      self::CONFIG_AUX_PHID => true,
       self::CONFIG_SERIALIZATION => array(
         'metadata' => self::SERIALIZATION_JSON,
       ),
diff --git a/src/applications/differential/storage/DifferentialTransactionComment.php b/src/applications/differential/storage/DifferentialTransactionComment.php
index 0f46665dac..c46d0c4b58 100644
--- a/src/applications/differential/storage/DifferentialTransactionComment.php
+++ b/src/applications/differential/storage/DifferentialTransactionComment.php
@@ -11,6 +11,7 @@ final class DifferentialTransactionComment
   protected $fixedState;
   protected $hasReplies = 0;
   protected $replyToCommentPHID;
+  protected $legacyCommentID;
 
   public function getApplicationTransactionObject() {
     return new DifferentialTransaction();
diff --git a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
index 32a49918d0..d324ca5226 100644
--- a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
+++ b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
@@ -1390,6 +1390,10 @@ final class PhabricatorBuiltinPatchList extends PhabricatorSQLPatchList {
         'type' => 'php',
         'name' => $this->getPatchPath('20130621.diffcommentphidmig.php'),
       ),
+      '20130621.diffcommentunphid.sql' => array(
+        'type' => 'sql',
+        'name' => $this->getPatchPath('20130621.diffcommentunphid.sql'),
+      ),
     );
   }
 }