multi tenancy part 1

backend/migrations/20240902011500_seed_admin_membership/down.sql

@@ -0,0 +1,7 @@
+DELETE FROM public.user_memberships
+WHERE user_id IN (
+    SELECT id FROM public.users WHERE username = 'admin'
+)
+  AND tenant_id IN (
+    SELECT tenant_id FROM public.tenants WHERE slug = 'admin'
+);