diff --git a/src/main/resources/db/migration/V014__tenant_slug_partial_unique.sql b/src/main/resources/db/migration/V014__tenant_slug_partial_unique.sql
new file mode 100644
index 0000000..b072d87
--- /dev/null
+++ b/src/main/resources/db/migration/V014__tenant_slug_partial_unique.sql
@@ -0,0 +1,5 @@
+-- Replace absolute unique constraint on slug with partial unique index
+-- that excludes DELETED tenants, allowing slug reuse after soft-delete.
+ALTER TABLE tenants DROP CONSTRAINT tenants_slug_key;
+DROP INDEX IF EXISTS idx_tenants_slug;
+CREATE UNIQUE INDEX tenants_slug_active_key ON tenants (slug) WHERE status != 'DELETED';