diff --git a/supabase/migrations/20260419225947_8d9ead74-700d-417e-b6f2-bfcbbe9799cb.sql b/supabase/migrations/20260419225947_8d9ead74-700d-417e-b6f2-bfcbbe9799cb.sql
new file mode 100644
index 0000000..ec4b9ea
--- /dev/null
+++ b/supabase/migrations/20260419225947_8d9ead74-700d-417e-b6f2-bfcbbe9799cb.sql
@@ -0,0 +1,18 @@
+-- Delete the 7,953 placeholder clients created by the bad invoice import.
+-- These are archived, have numeric external_id (e.g. "10008057"), and have
+-- no linked cases, invoices, homeowners, contacts, or field values.
+DELETE FROM public.client_field_values
+ WHERE client_id IN (
+   SELECT id FROM public.clients
+    WHERE archived_at IS NOT NULL AND external_id ~ '^[0-9]+$'
+ );
+
+DELETE FROM public.client_contacts
+ WHERE client_id IN (
+   SELECT id FROM public.clients
+    WHERE archived_at IS NOT NULL AND external_id ~ '^[0-9]+$'
+ );
+
+DELETE FROM public.clients
+ WHERE archived_at IS NOT NULL
+   AND external_id ~ '^[0-9]+$';
\ No newline at end of file