diff --git a/src/applications/project/storage/PhabricatorProject.php b/src/applications/project/storage/PhabricatorProject.php
index ecdd28f31c..e7c56f2e04 100644
--- a/src/applications/project/storage/PhabricatorProject.php
+++ b/src/applications/project/storage/PhabricatorProject.php
@@ -5,7 +5,8 @@ final class PhabricatorProject extends PhabricatorProjectDAO
     PhabricatorFlaggableInterface,
     PhabricatorPolicyInterface,
     PhabricatorSubscribableInterface,
-    PhabricatorCustomFieldInterface {
+    PhabricatorCustomFieldInterface,
+    PhabricatorDestructableInterface {
 
   protected $name;
   protected $status = PhabricatorProjectStatus::STATUS_ACTIVE;
@@ -247,4 +248,27 @@ final class PhabricatorProject extends PhabricatorProjectDAO
   }
 
 
+/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $this->delete();
+
+      $columns = id(new PhabricatorProjectColumn())
+        ->loadAllWhere('projectPHID = %s', $this->getPHID());
+      foreach ($columns as $column) {
+        $engine->destroyObject($column);
+      }
+
+      $slugs = id(new PhabricatorProjectSlug())
+        ->loadAllWhere('projectPHID = %s', $this->getPHID());
+      foreach ($slugs as $slug) {
+        $slug->delete();
+      }
+
+    $this->saveTransaction();
+  }
+
 }
diff --git a/src/applications/project/storage/PhabricatorProjectColumn.php b/src/applications/project/storage/PhabricatorProjectColumn.php
index e79443c22a..439e1ea13b 100644
--- a/src/applications/project/storage/PhabricatorProjectColumn.php
+++ b/src/applications/project/storage/PhabricatorProjectColumn.php
@@ -2,7 +2,8 @@
 
 final class PhabricatorProjectColumn
   extends PhabricatorProjectDAO
-  implements PhabricatorPolicyInterface {
+  implements PhabricatorPolicyInterface,
+  PhabricatorDestructableInterface {
 
   const STATUS_ACTIVE = 0;
   const STATUS_DELETED = 1;
@@ -87,4 +88,15 @@ final class PhabricatorProjectColumn
     return pht('Users must be able to see a project to see its board.');
   }
 
+
+/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+    $this->delete();
+    $this->saveTransaction();
+  }
+
 }