diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1984,6 +1984,8 @@
     'PhabricatorProjectCustomFieldStringIndex' => 'applications/project/storage/PhabricatorProjectCustomFieldStringIndex.php',
     'PhabricatorProjectDAO' => 'applications/project/storage/PhabricatorProjectDAO.php',
     'PhabricatorProjectDescriptionField' => 'applications/project/customfield/PhabricatorProjectDescriptionField.php',
+    'PhabricatorProjectEdgeTypeObjectHasProject' => 'applications/project/edge/PhabricatorProjectEdgeTypeObjectHasProject.php',
+    'PhabricatorProjectEdgeTypeProjectHasObject' => 'applications/project/edge/PhabricatorProjectEdgeTypeProjectHasObject.php',
     'PhabricatorProjectEditDetailsController' => 'applications/project/controller/PhabricatorProjectEditDetailsController.php',
     'PhabricatorProjectEditIconController' => 'applications/project/controller/PhabricatorProjectEditIconController.php',
     'PhabricatorProjectEditMainController' => 'applications/project/controller/PhabricatorProjectEditMainController.php',
@@ -4856,6 +4858,8 @@
     'PhabricatorProjectCustomFieldStringIndex' => 'PhabricatorCustomFieldStringIndexStorage',
     'PhabricatorProjectDAO' => 'PhabricatorLiskDAO',
     'PhabricatorProjectDescriptionField' => 'PhabricatorProjectStandardCustomField',
+    'PhabricatorProjectEdgeTypeObjectHasProject' => 'PhabricatorEdgeType',
+    'PhabricatorProjectEdgeTypeProjectHasObject' => 'PhabricatorEdgeType',
     'PhabricatorProjectEditDetailsController' => 'PhabricatorProjectController',
     'PhabricatorProjectEditIconController' => 'PhabricatorProjectController',
     'PhabricatorProjectEditMainController' => 'PhabricatorProjectController',
diff --git a/src/applications/differential/customfield/DifferentialProjectsField.php b/src/applications/differential/customfield/DifferentialProjectsField.php
--- a/src/applications/differential/customfield/DifferentialProjectsField.php
+++ b/src/applications/differential/customfield/DifferentialProjectsField.php
@@ -35,7 +35,7 @@
 
     $projects = PhabricatorEdgeQuery::loadDestinationPHIDs(
       $revision->getPHID(),
-      PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+      PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
     $projects = array_reverse($projects);
 
     return $projects;
@@ -97,7 +97,9 @@
   }
 
   public function getApplicationTransactionMetadata() {
-    return array('edge:type' => PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+    return array(
+      'edge:type' => PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST,
+    );
   }
 
   public function parseValueFromCommitMessage($value) {
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryController.php b/src/applications/diffusion/controller/DiffusionRepositoryController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryController.php
@@ -164,7 +164,7 @@
 
     $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
       $repository->getPHID(),
-      PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+      PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
     if ($project_phids) {
       $this->loadHandles($project_phids);
       $view->addProperty(
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
@@ -73,7 +73,7 @@
           ->setTransactionType($type_edge)
           ->setMetadataValue(
             'edge:type',
-            PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT)
+            PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST)
           ->setNewValue(
             array(
               '=' => array_fuse($v_projects),
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
@@ -265,7 +265,7 @@
 
     $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
       $repository->getPHID(),
-      PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+      PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
     if ($project_phids) {
       $this->loadHandles($project_phids);
       $project_text = $this->renderHandlesForPHIDs($project_phids);
diff --git a/src/applications/herald/adapter/HeraldPholioMockAdapter.php b/src/applications/herald/adapter/HeraldPholioMockAdapter.php
--- a/src/applications/herald/adapter/HeraldPholioMockAdapter.php
+++ b/src/applications/herald/adapter/HeraldPholioMockAdapter.php
@@ -103,7 +103,7 @@
       case self::FIELD_PROJECTS:
         return PhabricatorEdgeQuery::loadDestinationPHIDs(
           $this->getMock()->getPHID(),
-          PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+          PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
     }
 
     return parent::getHeraldField($field);
diff --git a/src/applications/paste/controller/PhabricatorPasteEditController.php b/src/applications/paste/controller/PhabricatorPasteEditController.php
--- a/src/applications/paste/controller/PhabricatorPasteEditController.php
+++ b/src/applications/paste/controller/PhabricatorPasteEditController.php
@@ -80,7 +80,7 @@
     } else {
       $v_projects = PhabricatorEdgeQuery::loadDestinationPHIDs(
         $paste->getPHID(),
-        PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+        PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
       $v_projects = array_reverse($v_projects);
     }
 
@@ -125,7 +125,7 @@
           ->setTransactionType(PhabricatorTransactions::TYPE_VIEW_POLICY)
           ->setNewValue($v_policy);
 
-        $proj_edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $proj_edge_type = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
         $xactions[] = id(new PhabricatorPasteTransaction())
           ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
           ->setMetadataValue('edge:type', $proj_edge_type)
diff --git a/src/applications/pholio/controller/PholioMockEditController.php b/src/applications/pholio/controller/PholioMockEditController.php
--- a/src/applications/pholio/controller/PholioMockEditController.php
+++ b/src/applications/pholio/controller/PholioMockEditController.php
@@ -52,7 +52,7 @@
     } else {
       $v_projects = PhabricatorEdgeQuery::loadDestinationPHIDs(
         $mock->getPHID(),
-        PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+        PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
       $v_projects = array_reverse($v_projects);
     }
 
@@ -208,7 +208,7 @@
       }
 
       if (!$errors) {
-        $proj_edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $proj_edge_type = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
         $xactions[] = id(new PholioTransaction())
           ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
           ->setMetadataValue('edge:type', $proj_edge_type)
diff --git a/src/applications/ponder/controller/PonderQuestionEditController.php b/src/applications/ponder/controller/PonderQuestionEditController.php
--- a/src/applications/ponder/controller/PonderQuestionEditController.php
+++ b/src/applications/ponder/controller/PonderQuestionEditController.php
@@ -27,7 +27,7 @@
       }
       $v_projects = PhabricatorEdgeQuery::loadDestinationPHIDs(
         $question->getPHID(),
-        PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+        PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
       $v_projects = array_reverse($v_projects);
     } else {
       $question = id(new PonderQuestion())
@@ -70,7 +70,7 @@
           ->setTransactionType(PonderQuestionTransaction::TYPE_CONTENT)
           ->setNewValue($v_content);
 
-        $proj_edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $proj_edge_type = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
         $xactions[] = id(new PonderQuestionTransaction())
           ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
           ->setMetadataValue('edge:type', $proj_edge_type)
diff --git a/src/applications/project/edge/PhabricatorProjectEdgeTypeObjectHasProject.php b/src/applications/project/edge/PhabricatorProjectEdgeTypeObjectHasProject.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/edge/PhabricatorProjectEdgeTypeObjectHasProject.php
@@ -0,0 +1,106 @@
+<?php
+
+final class PhabricatorProjectEdgeTypeObjectHasProject
+  extends PhabricatorEdgeType {
+
+  const EDGECONST = 41;
+
+  public function getEdgeConstant() {
+    return self::EDGECONST;
+  }
+
+  public function getInverseEdgeConstant() {
+    return PhabricatorProjectEdgeTypeProjectHasObject::EDGECONST;
+  }
+
+  public function getTransactionAddString(
+    $actor,
+    $add_count,
+    $add_edges) {
+
+    return pht(
+      '%s added %s project(s): %s.',
+      $actor,
+      $add_count,
+      $add_edges);
+  }
+
+  public function getTransactionRemoveString(
+    $actor,
+    $rem_count,
+    $rem_edges) {
+
+    return pht(
+      '%s removed %s project(s): %s.',
+      $actor,
+      $rem_count,
+      $rem_edges);
+  }
+
+  public function getTransactionEditString(
+    $actor,
+    $total_count,
+    $add_count,
+    $add_edges,
+    $rem_count,
+    $rem_edges) {
+
+    return pht(
+      '%s edited %s project(s), added %s: %s; removed %s: %s.',
+      $actor,
+      $total_count,
+      $add_count,
+      $add_edges,
+      $rem_count,
+      $rem_edges);
+  }
+
+  public function getFeedAddString(
+    $actor,
+    $object,
+    $add_count,
+    $add_edges) {
+
+    return pht(
+      '%s added %s project(s) to %s: %s.',
+      $actor,
+      $add_count,
+      $object,
+      $add_edges);
+  }
+
+  public function getFeedRemoveString(
+    $actor,
+    $object,
+    $rem_count,
+    $rem_edges) {
+
+    return pht(
+      '%s removed %s project(s) from %s: %s.',
+      $actor,
+      $object,
+      $rem_count,
+      $rem_edges);
+  }
+
+  public function getFeedEditString(
+    $actor,
+    $object,
+    $total_count,
+    $add_count,
+    $add_edges,
+    $rem_count,
+    $rem_edges) {
+
+    return pht(
+      '%s edited %s project(s) for %s, added %s: %s; removed %s: %s.',
+      $actor,
+      $total_count,
+      $object,
+      $add_count,
+      $add_edges,
+      $rem_count,
+      $rem_edges);
+  }
+
+}
diff --git a/src/applications/project/edge/PhabricatorProjectEdgeTypeProjectHasObject.php b/src/applications/project/edge/PhabricatorProjectEdgeTypeProjectHasObject.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/edge/PhabricatorProjectEdgeTypeProjectHasObject.php
@@ -0,0 +1,16 @@
+<?php
+
+final class PhabricatorProjectEdgeTypeProjectHasObject
+  extends PhabricatorEdgeType {
+
+  const EDGECONST = 42;
+
+  public function getEdgeConstant() {
+    return self::EDGECONST;
+  }
+
+  public function getInverseEdgeConstant() {
+    return PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
+  }
+
+}
diff --git a/src/applications/project/events/PhabricatorProjectUIEventListener.php b/src/applications/project/events/PhabricatorProjectUIEventListener.php
--- a/src/applications/project/events/PhabricatorProjectUIEventListener.php
+++ b/src/applications/project/events/PhabricatorProjectUIEventListener.php
@@ -31,7 +31,7 @@
 
     $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
       $object->getPHID(),
-      PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+      PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
     if ($project_phids) {
       $project_phids = array_reverse($project_phids);
       $handles = id(new PhabricatorHandleQuery())
diff --git a/src/applications/repository/query/PhabricatorRepositoryQuery.php b/src/applications/repository/query/PhabricatorRepositoryQuery.php
--- a/src/applications/repository/query/PhabricatorRepositoryQuery.php
+++ b/src/applications/repository/query/PhabricatorRepositoryQuery.php
@@ -208,7 +208,7 @@
 
   public function didFilterPage(array $repositories) {
     if ($this->needProjectPHIDs) {
-      $type_project = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+      $type_project = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
 
       $edge_query = id(new PhabricatorEdgeQuery())
         ->withSourcePHIDs(mpull($repositories, 'getPHID'))
diff --git a/src/applications/slowvote/controller/PhabricatorSlowvoteEditController.php b/src/applications/slowvote/controller/PhabricatorSlowvoteEditController.php
--- a/src/applications/slowvote/controller/PhabricatorSlowvoteEditController.php
+++ b/src/applications/slowvote/controller/PhabricatorSlowvoteEditController.php
@@ -41,7 +41,7 @@
     } else {
       $v_projects = PhabricatorEdgeQuery::loadDestinationPHIDs(
         $poll->getPHID(),
-        PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+        PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
       $v_projects = array_reverse($v_projects);
     }
 
@@ -108,7 +108,7 @@
         ->setNewValue($v_view_policy);
 
       if (empty($errors)) {
-        $proj_edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $proj_edge_type = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
         $xactions[] = id(new PhabricatorSlowvoteTransaction())
           ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
           ->setMetadataValue('edge:type', $proj_edge_type)
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -1153,7 +1153,7 @@
       }
 
       if ($phids) {
-        $edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT;
+        $edge_type = PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST;
         $block_xactions[] = newv(get_class(head($xactions)), array())
           ->setIgnoreOnNoEffect(true)
           ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
@@ -1967,7 +1967,7 @@
       if ($object instanceof PhabricatorProjectInterface) {
         $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
           $object->getPHID(),
-          PhabricatorEdgeConfig::TYPE_OBJECT_HAS_PROJECT);
+          PhabricatorProjectEdgeTypeObjectHasProject::EDGECONST);
       } else {
         $project_phids = $object->getProjectPHIDs();
       }
diff --git a/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php b/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
--- a/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
+++ b/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
@@ -57,9 +57,6 @@
   const TYPE_OBJECT_USES_CREDENTIAL     = 39;
   const TYPE_CREDENTIAL_USED_BY_OBJECT  = 40;
 
-  const TYPE_OBJECT_HAS_PROJECT         = 41;
-  const TYPE_PROJECT_HAS_OBJECT         = 42;
-
   const TYPE_OBJECT_HAS_COLUMN          = 43;
   const TYPE_COLUMN_HAS_OBJECT          = 44;
 
@@ -180,9 +177,6 @@
       self::TYPE_OBJECT_USES_CREDENTIAL => self::TYPE_CREDENTIAL_USED_BY_OBJECT,
       self::TYPE_CREDENTIAL_USED_BY_OBJECT => self::TYPE_OBJECT_USES_CREDENTIAL,
 
-      self::TYPE_OBJECT_HAS_PROJECT => self::TYPE_PROJECT_HAS_OBJECT,
-      self::TYPE_PROJECT_HAS_OBJECT => self::TYPE_OBJECT_HAS_PROJECT,
-
       self::TYPE_OBJECT_HAS_COLUMN => self::TYPE_COLUMN_HAS_OBJECT,
       self::TYPE_COLUMN_HAS_OBJECT => self::TYPE_OBJECT_HAS_COLUMN,
 
@@ -263,7 +257,6 @@
         return '%s edited member(s), added %d: %s; removed %d: %s.';
       case self::TYPE_MEMBER_OF_PROJ:
       case self::TYPE_COMMIT_HAS_PROJECT:
-      case self::TYPE_OBJECT_HAS_PROJECT:
         return '%s edited project(s), added %d: %s; removed %d: %s.';
       case self::TYPE_QUESTION_HAS_VOTING_USER:
       case self::TYPE_ANSWER_HAS_VOTING_USER:
@@ -278,7 +271,6 @@
       case self::TYPE_UNSUBSCRIBED_FROM_OBJECT:
       case self::TYPE_FILE_HAS_OBJECT:
       case self::TYPE_CONTRIBUTED_TO_OBJECT:
-      case self::TYPE_PROJECT_HAS_OBJECT:
         return '%s edited object(s), added %d: %s; removed %d: %s.';
       case self::TYPE_OBJECT_HAS_UNSUBSCRIBER:
         return '%s edited unsubcriber(s), added %d: %s; removed %d: %s.';
@@ -340,7 +332,6 @@
         return '%s added %d member(s): %s.';
       case self::TYPE_MEMBER_OF_PROJ:
       case self::TYPE_COMMIT_HAS_PROJECT:
-      case self::TYPE_OBJECT_HAS_PROJECT:
         return '%s added %d project(s): %s.';
       case self::TYPE_QUESTION_HAS_VOTING_USER:
       case self::TYPE_ANSWER_HAS_VOTING_USER:
@@ -381,7 +372,6 @@
       case self::TYPE_UNSUBSCRIBED_FROM_OBJECT:
       case self::TYPE_FILE_HAS_OBJECT:
       case self::TYPE_CONTRIBUTED_TO_OBJECT:
-      case self::TYPE_PROJECT_HAS_OBJECT:
       default:
         return '%s added %d object(s): %s.';
 
@@ -415,7 +405,6 @@
         return '%s removed %d member(s): %s.';
       case self::TYPE_MEMBER_OF_PROJ:
       case self::TYPE_COMMIT_HAS_PROJECT:
-      case self::TYPE_OBJECT_HAS_PROJECT:
         return '%s removed %d project(s): %s.';
       case self::TYPE_QUESTION_HAS_VOTING_USER:
       case self::TYPE_ANSWER_HAS_VOTING_USER:
@@ -454,7 +443,6 @@
       case self::TYPE_UNSUBSCRIBED_FROM_OBJECT:
       case self::TYPE_FILE_HAS_OBJECT:
       case self::TYPE_CONTRIBUTED_TO_OBJECT:
-      case self::TYPE_PROJECT_HAS_OBJECT:
       default:
         return '%s removed %d object(s): %s.';
 
@@ -486,7 +474,6 @@
         return '%s updated members of %s.';
       case self::TYPE_MEMBER_OF_PROJ:
       case self::TYPE_COMMIT_HAS_PROJECT:
-      case self::TYPE_OBJECT_HAS_PROJECT:
         return '%s updated projects of %s.';
       case self::TYPE_QUESTION_HAS_VOTING_USER:
       case self::TYPE_ANSWER_HAS_VOTING_USER:
@@ -525,7 +512,6 @@
       case self::TYPE_UNSUBSCRIBED_FROM_OBJECT:
       case self::TYPE_FILE_HAS_OBJECT:
       case self::TYPE_CONTRIBUTED_TO_OBJECT:
-      case self::TYPE_PROJECT_HAS_OBJECT:
       default:
         return '%s updated objects of %s.';