diff --git a/resources/sql/autopatches/20210315.affectedpath.01.epoch.sql b/resources/sql/autopatches/20210315.affectedpath.01.epoch.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20210315.affectedpath.01.epoch.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_differential.differential_affectedpath
+  DROP epoch;
diff --git a/resources/sql/autopatches/20210315.affectedpath.02.repositoryid.sql b/resources/sql/autopatches/20210315.affectedpath.02.repositoryid.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20210315.affectedpath.02.repositoryid.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_differential.differential_affectedpath
+  CHANGE repositoryID repositoryID INT UNSIGNED;
diff --git a/src/applications/differential/engine/DifferentialAffectedPathEngine.php b/src/applications/differential/engine/DifferentialAffectedPathEngine.php
--- a/src/applications/differential/engine/DifferentialAffectedPathEngine.php
+++ b/src/applications/differential/engine/DifferentialAffectedPathEngine.php
@@ -32,7 +32,7 @@
     if ($repository) {
       $repository_id = $repository->getID();
     } else {
-      return;
+      $repository_id = null;
     }
 
     $paths = $this->getAffectedPaths();
@@ -48,10 +48,9 @@
     foreach ($path_ids as $path_id) {
       $sql[] = qsprintf(
         $conn,
-        '(%d, %d, %d, %d)',
+        '(%nd, %d, %d)',
         $repository_id,
         $path_id,
-        PhabricatorTime::getNow(),
         $revision->getID());
     }
 
@@ -64,7 +63,7 @@
       foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
         queryfx(
           $conn,
-          'INSERT INTO %R (repositoryID, pathID, epoch, revisionID) VALUES %LQ',
+          'INSERT INTO %R (repositoryID, pathID, revisionID) VALUES %LQ',
           $table,
           $chunk);
       }
diff --git a/src/applications/differential/storage/DifferentialAffectedPath.php b/src/applications/differential/storage/DifferentialAffectedPath.php
--- a/src/applications/differential/storage/DifferentialAffectedPath.php
+++ b/src/applications/differential/storage/DifferentialAffectedPath.php
@@ -8,7 +8,6 @@
 
   protected $repositoryID;
   protected $pathID;
-  protected $epoch;
   protected $revisionID;
 
   protected function getConfiguration() {
@@ -16,15 +15,16 @@
       self::CONFIG_TIMESTAMPS => false,
       self::CONFIG_COLUMN_SCHEMA => array(
         'id' => null,
+        'repositoryID' => 'id?',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'PRIMARY' => null,
-        'repositoryID' => array(
-          'columns' => array('repositoryID', 'pathID', 'epoch'),
-        ),
         'revisionID' => array(
           'columns' => array('revisionID'),
         ),
+        'key_path' => array(
+          'columns' => array('pathID', 'repositoryID'),
+        ),
       ),
     ) + parent::getConfiguration();
   }