diff --git a/resources/sql/autopatches/20141222.maniphestprojtxn.php b/resources/sql/autopatches/20141222.maniphestprojtxn.php
new file mode 100644
index 0000000000..985fb1421b
--- /dev/null
+++ b/resources/sql/autopatches/20141222.maniphestprojtxn.php
@@ -0,0 +1,48 @@
+<?php
+
+$table = new ManiphestTransaction();
+$conn_w = $table->establishConnection('w');
+
+echo "Converting Maniphest project transactions to modern EDGE ".
+  "transactions...\n";
+$metadata = array(
+  'edge:type' => PhabricatorProjectObjectHasProjectEdgeType::EDGECONST,);
+foreach (new LiskMigrationIterator($table) as $txn) {
+  // ManiphestTransaction::TYPE_PROJECTS
+  if ($txn->getTransactionType() == 'projects') {
+    $old_value = mig20141222_build_edge_data(
+      $txn->getOldValue(),
+      $txn->getObjectPHID());
+    $new_value = mig20141222_build_edge_data(
+      $txn->getNewvalue(),
+      $txn->getObjectPHID());
+    queryfx(
+      $conn_w,
+      'UPDATE %T SET '.
+        'transactionType = %s, oldValue = %s, newValue = %s, metaData = %s '.
+      'WHERE id = %d',
+      $table->getTableName(),
+      PhabricatorTransactions::TYPE_EDGE,
+      json_encode($old_value),
+      json_encode($new_value),
+      json_encode($metadata),
+      $txn->getID());
+  }
+}
+
+echo "Done.\n";
+
+function mig20141222_build_edge_data(array $project_phids, $task_phid) {
+  $edge_data = array();
+  foreach ($project_phids as $project_phid) {
+    if (!is_scalar($project_phid)) {
+      continue;
+    }
+    $edge_data[$project_phid] = array(
+      'src' => $task_phid,
+      'type' => PhabricatorProjectObjectHasProjectEdgeType::EDGECONST,
+      'dst' => $project_phid,
+    );
+  }
+  return $edge_data;
+}
diff --git a/src/applications/maniphest/storage/ManiphestTransaction.php b/src/applications/maniphest/storage/ManiphestTransaction.php
index c72851c8dc..074fc36010 100644
--- a/src/applications/maniphest/storage/ManiphestTransaction.php
+++ b/src/applications/maniphest/storage/ManiphestTransaction.php
@@ -18,12 +18,6 @@ final class ManiphestTransaction
   // NOTE: this type is deprecated. Keep it around for legacy installs
   // so any transactions render correctly.
   const TYPE_ATTACH = 'attach';
-  /**
-   * TYPE_PROJECTS is legacy and depracted in favor of
-   * PhabricatorTransactions::TYPE_EDGE; keep it around for legacy
-   * transaction-rendering.
-   */
-  const TYPE_PROJECTS = 'projects';
 
   const MAILTAG_STATUS = 'maniphest-status';
   const MAILTAG_OWNER = 'maniphest-owner';
@@ -87,14 +81,6 @@ final class ManiphestTransaction
           $phids[] = $old;
         }
         break;
-      case self::TYPE_PROJECTS:
-        $phids = array_mergev(
-          array(
-            $phids,
-            nonempty($old, array()),
-            nonempty($new, array()),
-          ));
-        break;
       case self::TYPE_PROJECT_COLUMN:
         $phids[] = $new['projectPHID'];
         $phids[] = head($new['columnPHIDs']);
@@ -267,9 +253,6 @@ final class ManiphestTransaction
           return pht('Reassigned');
         }
 
-      case self::TYPE_PROJECTS:
-        return pht('Changed Projects');
-
       case self::TYPE_PROJECT_COLUMN:
         return pht('Changed Project Column');
 
@@ -340,9 +323,6 @@ final class ManiphestTransaction
       case self::TYPE_DESCRIPTION:
         return 'fa-pencil';
 
-      case self::TYPE_PROJECTS:
-        return 'fa-briefcase';
-
       case self::TYPE_PROJECT_COLUMN:
         return 'fa-columns';
 
@@ -483,36 +463,6 @@ final class ManiphestTransaction
             $this->renderHandleLink($new));
         }
 
-      case self::TYPE_PROJECTS:
-        $added = array_diff($new, $old);
-        $removed = array_diff($old, $new);
-        if ($added && !$removed) {
-          return pht(
-            '%s added %d project(s): %s',
-            $this->renderHandleLink($author_phid),
-            count($added),
-            $this->renderHandleList($added));
-        } else if ($removed && !$added) {
-          return pht(
-            '%s removed %d project(s): %s',
-            $this->renderHandleLink($author_phid),
-            count($removed),
-            $this->renderHandleList($removed));
-        } else if ($removed && $added) {
-          return pht(
-            '%s changed project(s), added %d: %s; removed %d: %s',
-            $this->renderHandleLink($author_phid),
-            count($added),
-            $this->renderHandleList($added),
-            count($removed),
-            $this->renderHandleList($removed));
-        } else {
-          // This is hit when rendering previews.
-          return pht(
-            '%s changed projects...',
-            $this->renderHandleLink($author_phid));
-        }
-
       case self::TYPE_PRIORITY:
         $old_name = ManiphestTaskPriority::getTaskPriorityName($old);
         $new_name = ManiphestTaskPriority::getTaskPriorityName($new);
@@ -730,34 +680,6 @@ final class ManiphestTransaction
             $this->renderHandleLink($new));
         }
 
-      case self::TYPE_PROJECTS:
-        $added = array_diff($new, $old);
-        $removed = array_diff($old, $new);
-        if ($added && !$removed) {
-          return pht(
-            '%s added %d project(s) to %s: %s',
-            $this->renderHandleLink($author_phid),
-            count($added),
-            $this->renderHandleLink($object_phid),
-            $this->renderHandleList($added));
-        } else if ($removed && !$added) {
-          return pht(
-            '%s removed %d project(s) from %s: %s',
-            $this->renderHandleLink($author_phid),
-            count($removed),
-            $this->renderHandleLink($object_phid),
-            $this->renderHandleList($removed));
-        } else if ($removed && $added) {
-          return pht(
-            '%s changed project(s) of %s, added %d: %s; removed %d: %s',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid),
-            count($added),
-            $this->renderHandleList($added),
-            count($removed),
-            $this->renderHandleList($removed));
-        }
-
       case self::TYPE_PRIORITY:
         $old_name = ManiphestTaskPriority::getTaskPriorityName($old);
         $new_name = ManiphestTaskPriority::getTaskPriorityName($new);
@@ -917,8 +839,6 @@ final class ManiphestTransaction
         return pht('The task already has the selected status.');
       case self::TYPE_OWNER:
         return pht('The task already has the selected owner.');
-      case self::TYPE_PROJECTS:
-        return pht('The task is already associated with those projects.');
       case self::TYPE_PRIORITY:
         return pht('The task already has the selected priority.');
     }