diff --git a/app/Actions/CreateBucketAction.php b/app/Actions/CreateBucketAction.php
index 8a09cf7..18ff266 100644
--- a/app/Actions/CreateBucketAction.php
+++ b/app/Actions/CreateBucketAction.php
@@ -39,10 +39,14 @@ public function execute(
                 // Check if priority already exists and shift others if needed
                 $existingBucket = $scenario->buckets()->where('priority', $priority)->first();
                 if ($existingBucket) {
-                    // Shift priorities to make room
+                    // Shift priorities in reverse order to avoid unique constraint violations
+                    // (SQLite checks constraints per-row during bulk updates)
                     $scenario->buckets()
                         ->where('priority', '>=', $priority)
-                        ->increment('priority');
+                        ->orderByDesc('priority')
+                        ->each(function ($bucket) {
+                            $bucket->increment('priority');
+                        });
                 }
             }