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
@@ -1666,6 +1666,7 @@
     'NuanceSourceActionController' => 'applications/nuance/controller/NuanceSourceActionController.php',
     'NuanceSourceController' => 'applications/nuance/controller/NuanceSourceController.php',
     'NuanceSourceDefaultEditCapability' => 'applications/nuance/capability/NuanceSourceDefaultEditCapability.php',
+    'NuanceSourceDefaultQueueTransaction' => 'applications/nuance/xaction/NuanceSourceDefaultQueueTransaction.php',
     'NuanceSourceDefaultViewCapability' => 'applications/nuance/capability/NuanceSourceDefaultViewCapability.php',
     'NuanceSourceDefinition' => 'applications/nuance/source/NuanceSourceDefinition.php',
     'NuanceSourceDefinitionTestCase' => 'applications/nuance/source/__tests__/NuanceSourceDefinitionTestCase.php',
@@ -1675,6 +1676,7 @@
     'NuanceSourceListController' => 'applications/nuance/controller/NuanceSourceListController.php',
     'NuanceSourceManageCapability' => 'applications/nuance/capability/NuanceSourceManageCapability.php',
     'NuanceSourceNameNgrams' => 'applications/nuance/storage/NuanceSourceNameNgrams.php',
+    'NuanceSourceNameTransaction' => 'applications/nuance/xaction/NuanceSourceNameTransaction.php',
     'NuanceSourcePHIDType' => 'applications/nuance/phid/NuanceSourcePHIDType.php',
     'NuanceSourceQuery' => 'applications/nuance/query/NuanceSourceQuery.php',
     'NuanceSourceSearchEngine' => 'applications/nuance/query/NuanceSourceSearchEngine.php',
@@ -6785,6 +6787,7 @@
     'NuanceSourceActionController' => 'NuanceController',
     'NuanceSourceController' => 'NuanceController',
     'NuanceSourceDefaultEditCapability' => 'PhabricatorPolicyCapability',
+    'NuanceSourceDefaultQueueTransaction' => 'NuanceSourceTransactionType',
     'NuanceSourceDefaultViewCapability' => 'PhabricatorPolicyCapability',
     'NuanceSourceDefinition' => 'Phobject',
     'NuanceSourceDefinitionTestCase' => 'PhabricatorTestCase',
@@ -6794,6 +6797,7 @@
     'NuanceSourceListController' => 'NuanceSourceController',
     'NuanceSourceManageCapability' => 'PhabricatorPolicyCapability',
     'NuanceSourceNameNgrams' => 'PhabricatorSearchNgrams',
+    'NuanceSourceNameTransaction' => 'NuanceSourceTransactionType',
     'NuanceSourcePHIDType' => 'PhabricatorPHIDType',
     'NuanceSourceQuery' => 'NuanceQuery',
     'NuanceSourceSearchEngine' => 'PhabricatorApplicationSearchEngine',
diff --git a/src/applications/nuance/editor/NuanceSourceEditEngine.php b/src/applications/nuance/editor/NuanceSourceEditEngine.php
--- a/src/applications/nuance/editor/NuanceSourceEditEngine.php
+++ b/src/applications/nuance/editor/NuanceSourceEditEngine.php
@@ -96,14 +96,15 @@
         ->setKey('name')
         ->setLabel(pht('Name'))
         ->setDescription(pht('Name of the source.'))
-        ->setTransactionType(NuanceSourceTransaction::TYPE_NAME)
+        ->setTransactionType(NuanceSourceNameTransaction::TRANSACTIONTYPE)
         ->setIsRequired(true)
         ->setValue($object->getName()),
       id(new PhabricatorDatasourceEditField())
         ->setKey('defaultQueue')
         ->setLabel(pht('Default Queue'))
         ->setDescription(pht('Default queue.'))
-        ->setTransactionType(NuanceSourceTransaction::TYPE_DEFAULT_QUEUE)
+        ->setTransactionType(
+          NuanceSourceDefaultQueueTransaction::TRANSACTIONTYPE)
         ->setDatasource(new NuanceQueueDatasource())
         ->setSingleValue($object->getDefaultQueuePHID()),
     );
diff --git a/src/applications/nuance/editor/NuanceSourceEditor.php b/src/applications/nuance/editor/NuanceSourceEditor.php
--- a/src/applications/nuance/editor/NuanceSourceEditor.php
+++ b/src/applications/nuance/editor/NuanceSourceEditor.php
@@ -18,111 +18,10 @@
   public function getTransactionTypes() {
     $types = parent::getTransactionTypes();
 
-    $types[] = NuanceSourceTransaction::TYPE_NAME;
-    $types[] = NuanceSourceTransaction::TYPE_DEFAULT_QUEUE;
-
-    $types[] = PhabricatorTransactions::TYPE_EDGE;
-    $types[] = PhabricatorTransactions::TYPE_COMMENT;
     $types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
     $types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
 
     return $types;
   }
 
-  protected function getCustomTransactionOldValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case NuanceSourceTransaction::TYPE_NAME:
-        return $object->getName();
-      case NuanceSourceTransaction::TYPE_DEFAULT_QUEUE:
-        return $object->getDefaultQueuePHID();
-    }
-
-    return parent::getCustomTransactionOldValue($object, $xaction);
-  }
-
-  protected function getCustomTransactionNewValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case NuanceSourceTransaction::TYPE_NAME:
-      case NuanceSourceTransaction::TYPE_DEFAULT_QUEUE:
-        return $xaction->getNewValue();
-    }
-
-    return parent::getCustomTransactionNewValue($object, $xaction);
-  }
-
-  protected function applyCustomInternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case NuanceSourceTransaction::TYPE_NAME:
-        $object->setName($xaction->getNewValue());
-        break;
-      case NuanceSourceTransaction::TYPE_DEFAULT_QUEUE:
-        $object->setDefaultQueuePHID($xaction->getNewValue());
-        break;
-    }
-  }
-
-  protected function applyCustomExternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case NuanceSourceTransaction::TYPE_NAME:
-      case NuanceSourceTransaction::TYPE_DEFAULT_QUEUE:
-        return;
-    }
-
-    return parent::applyCustomExternalTransaction($object, $xaction);
-  }
-
-  protected function validateTransaction(
-    PhabricatorLiskDAO $object,
-    $type,
-    array $xactions) {
-
-    $errors = parent::validateTransaction($object, $type, $xactions);
-
-    switch ($type) {
-      case NuanceSourceTransaction::TYPE_NAME:
-        $missing = $this->validateIsEmptyTextField(
-          $object->getName(),
-          $xactions);
-
-        if ($missing) {
-          $error = new PhabricatorApplicationTransactionValidationError(
-            $type,
-            pht('Required'),
-            pht('Source name is required.'),
-            nonempty(last($xactions), null));
-
-          $error->setIsMissingFieldError(true);
-          $errors[] = $error;
-        }
-        break;
-      case NuanceSourceTransaction::TYPE_DEFAULT_QUEUE:
-        foreach ($xactions as $xaction) {
-          if (!$xaction->getNewValue()) {
-            $error = new PhabricatorApplicationTransactionValidationError(
-              $type,
-              pht('Required'),
-              pht('Sources must have a default queue.'),
-              $xaction);
-            $error->setIsMissingFieldError(true);
-            $errors[] = $error;
-          }
-        }
-        break;
-    }
-
-    return $errors;
-  }
-
 }
diff --git a/src/applications/nuance/storage/NuanceSourceTransaction.php b/src/applications/nuance/storage/NuanceSourceTransaction.php
--- a/src/applications/nuance/storage/NuanceSourceTransaction.php
+++ b/src/applications/nuance/storage/NuanceSourceTransaction.php
@@ -3,9 +3,6 @@
 final class NuanceSourceTransaction
   extends NuanceTransaction {
 
-  const TYPE_NAME = 'source.name';
-  const TYPE_DEFAULT_QUEUE = 'source.queue.default';
-
   public function getApplicationTransactionType() {
     return NuanceSourcePHIDType::TYPECONST;
   }
@@ -18,63 +15,4 @@
     return 'NuanceSourceTransactionType';
   }
 
-  public function shouldHide() {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-    $type = $this->getTransactionType();
-
-    switch ($type) {
-      case self::TYPE_DEFAULT_QUEUE:
-        return !$old;
-      case self::TYPE_NAME:
-        return ($old === null);
-    }
-
-    return parent::shouldHide();
-  }
-
-  public function getRequiredHandlePHIDs() {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-    $type = $this->getTransactionType();
-
-    $phids = parent::getRequiredHandlePHIDs();
-    switch ($type) {
-      case self::TYPE_DEFAULT_QUEUE:
-        if ($old) {
-          $phids[] = $old;
-        }
-        if ($new) {
-          $phids[] = $new;
-        }
-        break;
-    }
-
-    return $phids;
-  }
-
-  public function getTitle() {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-    $type = $this->getTransactionType();
-    $author_phid = $this->getAuthorPHID();
-
-    switch ($type) {
-      case self::TYPE_DEFAULT_QUEUE:
-        return pht(
-          '%s changed the default queue from %s to %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($old),
-          $this->renderHandleLink($new));
-      case self::TYPE_NAME:
-        return pht(
-          '%s renamed this source from "%s" to "%s".',
-          $this->renderHandleLink($author_phid),
-          $old,
-          $new);
-    }
-
-    return parent::getTitle();
-  }
-
 }
diff --git a/src/applications/nuance/xaction/NuanceSourceDefaultQueueTransaction.php b/src/applications/nuance/xaction/NuanceSourceDefaultQueueTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/nuance/xaction/NuanceSourceDefaultQueueTransaction.php
@@ -0,0 +1,42 @@
+<?php
+
+final class NuanceSourceDefaultQueueTransaction
+  extends NuanceSourceTransactionType {
+
+  const TRANSACTIONTYPE = 'source.queue.default';
+
+  public function generateOldValue($object) {
+    return $object->getDefaultQueuePHID();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setDefaultQueuePHID($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed the default queue for this source from %s to %s.',
+      $this->renderAuthor(),
+      $this->renderOldHandle(),
+      $this->renderNewHandle());
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    if (!$object->getDefaultQueuePHID() && !$xactions) {
+      $errors[] = $this->newRequiredError(
+          pht('Sources must have a default queue.'));
+    }
+
+    foreach ($xactions as $xaction) {
+      if (!$xaction->getNewValue()) {
+        $errors[] = $this->newRequiredError(
+            pht('Sources must have a default queue.'));
+      }
+    }
+
+    return $errors;
+  }
+
+}
diff --git a/src/applications/nuance/xaction/NuanceSourceNameTransaction.php b/src/applications/nuance/xaction/NuanceSourceNameTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/nuance/xaction/NuanceSourceNameTransaction.php
@@ -0,0 +1,47 @@
+<?php
+
+final class NuanceSourceNameTransaction
+  extends NuanceSourceTransactionType {
+
+  const TRANSACTIONTYPE = 'source.name';
+
+  public function generateOldValue($object) {
+    return $object->getName();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setName($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s renamed this source from %s to %s.',
+      $this->renderAuthor(),
+      $this->renderOldValue(),
+      $this->renderNewValue());
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    if ($this->isEmptyTextTransaction($object->getName(), $xactions)) {
+      $errors[] = $this->newRequiredError(
+        pht('Sources must have a name.'));
+    }
+
+    $max_length = $object->getColumnMaximumByteLength('name');
+    foreach ($xactions as $xaction) {
+      $new_value = $xaction->getNewValue();
+      $new_length = strlen($new_value);
+      if ($new_length > $max_length) {
+        $errors[] = $this->newInvalidError(
+          pht(
+            'Source names must not be longer than %s character(s).',
+            new PhutilNumber($max_length)));
+      }
+    }
+
+    return $errors;
+  }
+
+}