CREATE TABLE IF NOT EXISTS supplier_packing_lists (
  id SERIAL PRIMARY KEY,
  supplier_id INTEGER NOT NULL REFERENCES suppliers(id),
  packing_number VARCHAR(255) NOT NULL UNIQUE,
  notes TEXT,
  created_at TIMESTAMP DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS supplier_packing_list_items (
  id SERIAL PRIMARY KEY,
  supplier_packing_list_id INTEGER NOT NULL REFERENCES supplier_packing_lists(id) ON DELETE CASCADE,
  component_id INTEGER NOT NULL REFERENCES components(id),
  quantity INTEGER NOT NULL DEFAULT 1,
  created_at TIMESTAMP DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_spl_supplier ON supplier_packing_lists(supplier_id);
CREATE INDEX IF NOT EXISTS idx_spli_packing ON supplier_packing_list_items(supplier_packing_list_id);