diff --git a/crates/collab/migrations/20251117215316_add_external_id_to_billing_customers.sql b/crates/collab/migrations/20251117215316_add_external_id_to_billing_customers.sql
new file mode 100644
index 0000000000000000000000000000000000000000..6add45d4ad5d83cea6d86d2edc1e06613bd25560
--- /dev/null
+++ b/crates/collab/migrations/20251117215316_add_external_id_to_billing_customers.sql
@@ -0,0 +1,4 @@
+alter table billing_customers
+    add column external_id text;
+
+create unique index uix_billing_customers_on_external_id on billing_customers (external_id);