case provisions are deleted when case is deleted.

modules/opencase_cases/src/Entity/OCCase.php

@@ -91,6 +91,14 @@ class OCCase extends RevisionableContentEntityBase implements OCCaseInterface
     ];
   }
 
+  public function deleteCaseProvisions(): void {
+    $query = \Drupal::entityQuery('oc_case_provision')
+      ->condition('oc_case.target_id', $this->id());
+    $ids =  $query->execute();
+    foreach($ids as $id) {
+      OCcaseProvision::load($id)->delete();
+    }
+  }
 
   public static function defaultTarget()
   {