diff --git a/supabase/migrations/20260530170000_rls_write_print_area_techniques_supplier_branches.sql b/supabase/migrations/20260530170000_rls_write_print_area_techniques_supplier_branches.sql
new file mode 100644
index 000000000..e10289238
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+++ b/supabase/migrations/20260530170000_rls_write_print_area_techniques_supplier_branches.sql
@@ -0,0 +1,119 @@
+-- ============================================================================
+-- RLS de ESCRITA para print_area_techniques e supplier_branches (Plano A / PR#3)
+-- ----------------------------------------------------------------------------
+-- Contexto (CORRECAO-07):
+--   O Plano A roteia a escrita de admin pela camada REST nativa (PostgREST + RLS),
+--   substituindo a Edge Function bridge (morta). A auditoria das 13 tabelas-base
+--   gravadas pelos hooks de admin mostrou que 11 JA possuem policies de escrita
+--   (products, suppliers, categories, product_variants, variant_supplier_sources,
+--    collections, collection_products, tecnicas_gravacao, tabela_preco_gravacao_oficial).
+--
+--   Restavam 2 GAPS — escrita autenticada negada por falta de policy:
+--     1. print_area_techniques: so tinha `pat_all_service` (service_role). Admin
+--        autenticado nao conseguia inserir/atualizar/excluir via REST nativo.
+--     2. supplier_branches: nenhuma policy de escrita -> toda escrita negada.
+--
+--   Nenhuma das duas tem organization_id propria; ambas sao FILHAS de uma tabela
+--   que tem. Portanto espelhamos EXATAMENTE o modelo de seguranca do irmao direto,
+--   checando a org pelo pai:
+--     - print_area_techniques (product_id)  -> espelha product_variants (via products)
+--     - supplier_branches    (supplier_id)  -> espelha suppliers
+--
+--   (tecnica_gravacao_variante e fornecedor_gravacao foram verificadas e NAO existem
+--    como tabelas; ficam de fora — escrita a elas falha LOUD, nunca silenciosa.)
+--
+-- Idempotente: DROP POLICY IF EXISTS antes de cada CREATE. A policy de service_role
+-- (`pat_all_service`) NAO e tocada. Reversivel: basta dropar as policies criadas aqui.
+-- ============================================================================
+
+-- RLS ja esta habilitado nas duas (no-op idempotente, por garantia).
+ALTER TABLE public.print_area_techniques ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.supplier_branches     ENABLE ROW LEVEL SECURITY;
+
+-- ── print_area_techniques (filha de products via product_id) ────────────
+-- Espelha product_variants: insert/update via user_is_org_member, delete via
+-- is_org_owner_or_admin, sempre resolvendo a org pelo produto-pai.
+
+DROP POLICY IF EXISTS pat_org_insert ON public.print_area_techniques;
+CREATE POLICY pat_org_insert ON public.print_area_techniques
+  FOR INSERT TO public
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.products p
+      WHERE p.id = print_area_techniques.product_id
+        AND user_is_org_member(p.organization_id)
+    )
+  );
+
+DROP POLICY IF EXISTS pat_org_update ON public.print_area_techniques;
+CREATE POLICY pat_org_update ON public.print_area_techniques
+  FOR UPDATE TO public
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.products p
+      WHERE p.id = print_area_techniques.product_id
+        AND user_is_org_member(p.organization_id)
+    )
+  )
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.products p
+      WHERE p.id = print_area_techniques.product_id
+        AND user_is_org_member(p.organization_id)
+    )
+  );
+
+DROP POLICY IF EXISTS pat_org_delete ON public.print_area_techniques;
+CREATE POLICY pat_org_delete ON public.print_area_techniques
+  FOR DELETE TO public
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.products p
+      WHERE p.id = print_area_techniques.product_id
+        AND is_org_owner_or_admin(p.organization_id)
+    )
+  );
+
+-- ── supplier_branches (filha de suppliers via supplier_id) ───────────────
+-- Espelha suppliers: insert/update/delete via is_org_owner_or_admin, resolvendo a
+-- org pelo fornecedor-pai.
+
+DROP POLICY IF EXISTS supplier_branches_org_insert ON public.supplier_branches;
+CREATE POLICY supplier_branches_org_insert ON public.supplier_branches
+  FOR INSERT TO public
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.suppliers s
+      WHERE s.id = supplier_branches.supplier_id
+        AND is_org_owner_or_admin(s.organization_id)
+    )
+  );
+
+DROP POLICY IF EXISTS supplier_branches_org_update ON public.supplier_branches;
+CREATE POLICY supplier_branches_org_update ON public.supplier_branches
+  FOR UPDATE TO public
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.suppliers s
+      WHERE s.id = supplier_branches.supplier_id
+        AND is_org_owner_or_admin(s.organization_id)
+    )
+  )
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.suppliers s
+      WHERE s.id = supplier_branches.supplier_id
+        AND is_org_owner_or_admin(s.organization_id)
+    )
+  );
+
+DROP POLICY IF EXISTS supplier_branches_org_delete ON public.supplier_branches;
+CREATE POLICY supplier_branches_org_delete ON public.supplier_branches
+  FOR DELETE TO public
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.suppliers s
+      WHERE s.id = supplier_branches.supplier_id
+        AND is_org_owner_or_admin(s.organization_id)
+    )
+  );