diff --git a/migrations/000.631.sql b/migrations/000.631.sql
new file mode 100644
index 0000000..6c432a7
--- /dev/null
+++ b/migrations/000.631.sql
@@ -0,0 +1,14 @@
+-- Backfill any category that exists in categories_v2_lft_rgt but is missing
+-- from the canonical `categories` table. The canonical table is what
+-- product_category references via FK, so every v2 category must have a
+-- corresponding row there (with is_v2 = true).
+--
+-- This covers categories 1824 and 1825 (created before insertNode was fixed)
+-- and any other gaps that may exist. ON CONFLICT makes it safe to re-run.
+INSERT INTO categories (id, name, is_v2)
+SELECT  v2.id, v2.name, true
+FROM    categories_v2_lft_rgt v2
+WHERE   NOT EXISTS (
+            SELECT 1 FROM categories c WHERE c.id = v2.id
+        )
+ON CONFLICT (id) DO NOTHING;