Index: src/applications/differential/controller/DifferentialInlineCommentEditController.php
===================================================================
--- src/applications/differential/controller/DifferentialInlineCommentEditController.php
+++ src/applications/differential/controller/DifferentialInlineCommentEditController.php
@@ -60,8 +60,9 @@
       return false;
     }
 
-    // Saved comments may not be edited.
-    if ($inline->getCommentID()) {
+    // Saved comments may not be edited, for now, although the schema now
+    // supports it.
+    if (!$inline->isDraft()) {
       return false;
     }
 
Index: src/applications/differential/query/DifferentialInlineCommentQuery.php
===================================================================
--- src/applications/differential/query/DifferentialInlineCommentQuery.php
+++ src/applications/differential/query/DifferentialInlineCommentQuery.php
@@ -45,11 +45,6 @@
     return $this;
   }
 
-  public function withCommentIDs(array $comment_ids) {
-    $this->commentIDs = $comment_ids;
-    return $this;
-  }
-
   public function execute() {
     $table = new DifferentialTransactionComment();
     $conn_r = $table->establishConnection('r');
@@ -155,13 +150,6 @@
         $this->draftsByAuthors);
     }
 
-    if ($this->commentIDs) {
-      $where[] = qsprintf(
-        $conn_r,
-        'legacyCommentID IN (%Ld)',
-        $this->commentIDs);
-    }
-
     return $this->formatWhereClause($where);
   }
 
Index: src/applications/differential/storage/DifferentialInlineComment.php
===================================================================
--- src/applications/differential/storage/DifferentialInlineComment.php
+++ src/applications/differential/storage/DifferentialInlineComment.php
@@ -167,7 +167,6 @@
   // the future transaction.
 
   public function setCommentID($id) {
-    $this->proxy->setLegacyCommentID($id);
     $this->proxy->setTransactionPHID(
       PhabricatorPHID::generateNewPHID(
         PhabricatorApplicationTransactionPHIDTypeTransaction::TYPECONST,
@@ -175,11 +174,6 @@
     return $this;
   }
 
-  public function getCommentID() {
-    return $this->proxy->getLegacyCommentID();
-  }
-
-
 /* -(  PhabricatorMarkupInterface Implementation  )-------------------------- */
 
 
@@ -202,7 +196,7 @@
 
   public function shouldUseMarkupCache($field) {
     // Only cache submitted comments.
-    return ($this->getID() && $this->getCommentID());
+    return ($this->getID() && !$this->isDraft());
   }
 
 }