diff --git a/src/infrastructure/storage/lisk/LiskDAO.php b/src/infrastructure/storage/lisk/LiskDAO.php
--- a/src/infrastructure/storage/lisk/LiskDAO.php
+++ b/src/infrastructure/storage/lisk/LiskDAO.php
@@ -197,6 +197,9 @@
   protected $dateCreated;
   protected $dateModified;
 
+  private $dangerousOverrideID;
+  private $dangerousOverrideTimeStamp;
+
   /**
    *  Build an empty object.
    *
@@ -210,6 +213,30 @@
   }
 
 
+/* -(  Shooting Yourself in the Foot   )------------------------------------- */
+
+  /*
+   * Both of these "dangerous" methods are for overriding when objects
+   * are created/changed and what their IDs are.  This is intended for
+   * (A) writing import scripts from other systems (B) setting up test
+   * scenarios.
+   *
+   * They are dangerous and there is little safety to keep you from
+   * wrecking an install.  There is no guarantee that future versions
+   * of Phabricator will not place logical constraints on the ordering
+   * of timestamps and bad things may happen if you create impossible scenarios.
+   */
+  public function setDangerousOverrideID($id) {
+    $this->dangerousOverrideID = $id;
+    return $this;
+  }
+
+  public function setDangerousOverrideTimeStamp($ts) {
+    $this->dangerousOverrideTimeStamp = $ts;
+    return $this;
+  }
+
+
 /* -(  Managing Connections  )----------------------------------------------- */
 
 
@@ -1155,7 +1182,6 @@
     $data = $this->getAllLiskPropertyValues();
 
     $conn = $this->establishConnection('w');
-
     $id_mechanism = $this->getConfigOption(self::CONFIG_IDS);
     switch ($id_mechanism) {
       case self::IDS_AUTOINCREMENT:
@@ -1163,7 +1189,10 @@
         // ID column, if it is empty. If the caller has explicitly provided a
         // value, use it.
         $id_key = $this->getIDKeyForUse();
-        if (empty($data[$id_key])) {
+        if (isset($this->dangerousOverrideID)) {
+          $this->setID($this->dangerousOverrideID);
+          $data[$id_key] = $this->dangerousOverrideID;
+        } else if (empty($data[$id_key])) {
           unset($data[$id_key]);
         }
         break;
@@ -1171,7 +1200,10 @@
         // If we are using counter IDs, assign a new ID if we don't already have
         // one.
         $id_key = $this->getIDKeyForUse();
-        if (empty($data[$id_key])) {
+        if (isset($this->dangerousOverrideID)) {
+          $this->setID($this->dangerousOverrideID);
+          $data[$id_key] = $this->dangerousOverrideID;
+        } else if (empty($data[$id_key])) {
           $counter_name = $this->getTableName();
           $id = self::loadNextCounterID($conn, $counter_name);
           $this->setID($id);
@@ -1327,10 +1359,15 @@
     $use_timestamps = $this->getConfigOption(self::CONFIG_TIMESTAMPS);
 
     if ($use_timestamps) {
-      if (!$this->getDateCreated()) {
-        $this->setDateCreated(time());
+      if (isset($this->dangerousOverrideTimeStamp)) {
+        $this->setDateCreated($this->dangerousOverrideTimeStamp);
+        $this->setDateModified($this->dangerousOverrideTimeStamp);
+      } else {
+        if (!$this->getDateCreated()) {
+          $this->setDateCreated(time());
+        }
+        $this->setDateModified(time());
       }
-      $this->setDateModified(time());
     }
 
     if ($this->getConfigOption(self::CONFIG_AUX_PHID) && !$this->getPHID()) {