diff --git a/db/atlas/stripe_invoice/migrations/20260118151944_add_unique_index_to_stripe_accounts.sql b/db/atlas/stripe_invoice/migrations/20260118151944_add_unique_index_to_stripe_accounts.sql
new file mode 100644
index 0000000..f35d277
--- /dev/null
+++ b/db/atlas/stripe_invoice/migrations/20260118151944_add_unique_index_to_stripe_accounts.sql
@@ -0,0 +1,7 @@
+-- Ensure one Stripe account per user
+CREATE UNIQUE INDEX stripe_accounts_user_unique
+ON stripe_accounts (user_id);
+
+-- Prevent the same Stripe account being linked twice
+CREATE UNIQUE INDEX stripe_accounts_stripe_account_unique
+ON stripe_accounts (stripe_account_id);