diff --git a/backend/internal/db/schema.sql b/backend/internal/db/schema.sql
index 9786ac5..b35ad93 100644
--- a/backend/internal/db/schema.sql
+++ b/backend/internal/db/schema.sql
@@ -494,3 +494,10 @@ BEGIN
     END IF;
 END $$;
 
+DO $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='codigos_acesso' AND column_name='empresa_id') THEN
+        ALTER TABLE codigos_acesso ADD COLUMN empresa_id UUID REFERENCES empresas(id) ON DELETE SET NULL;
+    END IF;
+END $$;
+