diff --git a/classes/local/model/model_item_param.php b/classes/local/model/model_item_param.php
index 5e3209201..828bf1c87 100644
--- a/classes/local/model/model_item_param.php
+++ b/classes/local/model/model_item_param.php
@@ -273,6 +273,16 @@ public function get_componentid(): string {
         return $this->componentid;
     }
 
+    /**
+     * Sets the component ID (e.g. question id).
+     *
+     * @return self
+     */
+    public function set_componentid(string $componentid): self {
+        $this->componentid = $componentid;
+        return $this;
+    }
+
     /**
      * Return name of model.
      *
diff --git a/classes/local/model/model_item_param_list.php b/classes/local/model/model_item_param_list.php
index fe9b23ead..ee4f8ebdf 100644
--- a/classes/local/model/model_item_param_list.php
+++ b/classes/local/model/model_item_param_list.php
@@ -38,6 +38,7 @@
 use local_catquiz\data\catscale_structure;
 use local_catquiz\data\dataapi;
 use local_catquiz\event\testiteminscale_added;
+use local_catquiz\remote\hash\question_hasher;
 use moodle_exception;
 use stdClass;
 use Traversable;
@@ -55,7 +56,12 @@
  * @copyright 2024 Wunderbyte GmbH <info@wunderbyte.at>
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class model_item_param_list implements ArrayAccess, IteratorAggregate, Countable {
+class model_item_param_list implements ArrayAccess, Countable, IteratorAggregate {
+    /**
+     * @var bool Indicates if the list uses question hashes instead of IDs.
+     */
+    private bool $useshashes = false;
+
     /**
      * @var array<model_item_param>
      */
@@ -601,6 +607,54 @@ public function filter_by_componentids(array $itemids, bool $clone = true): self
         return $this;
     }
 
+    /**
+     * Merge another item param list into this one.
+     * @param model_item_param_list $other The list to merge
+     * @return self
+     * @throws coding_exception If lists are incompatible
+     */
+    public function merge(model_item_param_list $other): self {
+        if ($this->useshashes !== $other->useshashes) {
+            throw new coding_exception('Cannot merge lists with different identifier types.');
+        }
+
+        foreach ($other->itemparams as $itemparam) {
+            if (!isset($this->itemparams[$itemparam->get_componentid()])) {
+                $this->add($itemparam);
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * Sets the list to use question hashes instead of IDs.
+     *
+     * @return self
+     */
+    public function use_hashes(): self {
+        $this->useshashes = true;
+        return $this;
+    }
+
+    /**
+     * Convert question hashes to IDs.
+     * @return self
+     */
+    public function convert_hashes_to_ids(): self {
+        if (!$this->useshashes) {
+            return $this;
+        }
+
+        foreach ($this->itemparams as $itemparam) {
+            $questionid = question_hasher::get_questionid_from_hash($itemparam->get_componentid());
+            if ($questionid) {
+                $itemparam->set_componentid($questionid);
+            }
+        }
+        $this->useshashes = false;
+        return $this;
+    }
+
     /**
      * Gets scaleid and updates scaleid of record.
      * @param array $newrecord
diff --git a/host/calculate.php b/host/calculate.php
index ae3c80ba2..3b2c3fb9e 100644
--- a/host/calculate.php
+++ b/host/calculate.php
@@ -22,6 +22,9 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use local_catquiz\catscale;
+use local_catquiz\data\dataapi;
+use local_catquiz\event\calculation_executed;
 use local_catquiz\local\model\model_responses;
 use local_catquiz\local\model\model_strategy;
 
@@ -51,10 +54,38 @@
 
 if (optional_param('action', '', PARAM_ALPHA) === 'submit') {
     $catscaleid = 51;
+    $catscale = catscale::return_catscale_object($catscaleid);
     try {
         $modelresponses = model_responses::create_from_remote_responses($catscaleid);
         $strategy = new model_strategy($modelresponses);
-        [$itemdiffs, $personabilities] = $strategy->run_estimation();
+        [$itemdifficulties, $personabilities] = $strategy->run_estimation();
+        $newcontext = dataapi::create_new_context_for_updated_parameters($catscale);
+        $updatedmodels = [];
+        foreach ($itemdifficulties as $modelname => $itemparamlist) {
+            $itemcounter = 0;
+            /** @var model_item_param_list $itemparamlist */
+            $itemparamlist
+                ->use_hashes()
+                ->convert_hashes_to_ids()
+                ->save_to_db($newcontext->id);
+            $itemcounter += count($itemparamlist->itemparams);
+            $model = get_string('pluginname', 'catmodel_' . $modelname);
+            $updatedmodels[$model] = $itemcounter;
+        }
+
+        $updatedmodelsjson = json_encode($updatedmodels);
+        // Trigger event.
+        $event = calculation_executed::create([
+            'context' => \context_system::instance(),
+            'userid' => $userid,
+            'other' => [
+                'catscaleid' => $catscaleid,
+                'contextid' => $contextid,
+                'userid' => $userid,
+                'updatedmodelsjson' => $updatedmodelsjson,
+            ],
+        ]);
+        $event->trigger();
 
         echo $OUTPUT->notification(
             'Created model_responses',