-- Drop the old packing_lists table and recreate with correct schema
DROP TABLE IF EXISTS packing_list_serials CASCADE;
DROP TABLE IF EXISTS packing_lists CASCADE;

CREATE TABLE packing_lists (
  id SERIAL PRIMARY KEY,
  purchase_order_id INTEGER NOT NULL REFERENCES purchase_orders(id),
  po_item_id INTEGER NOT NULL REFERENCES purchase_order_items(id),
  packing_number VARCHAR(50) NOT NULL UNIQUE,
  quantity INTEGER NOT NULL DEFAULT 0,
  notes TEXT,
  created_at TIMESTAMPTZ DEFAULT NOW()
);

CREATE TABLE packing_list_serials (
  id SERIAL PRIMARY KEY,
  packing_list_id INTEGER NOT NULL REFERENCES packing_lists(id) ON DELETE CASCADE,
  serial_number VARCHAR(200) NOT NULL,
  created_at TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX idx_packing_lists_po ON packing_lists(purchase_order_id);
CREATE INDEX idx_packing_lists_item ON packing_lists(po_item_id);
CREATE INDEX idx_packing_serials_list ON packing_list_serials(packing_list_id);
CREATE UNIQUE INDEX idx_packing_serials_unique ON packing_list_serials(serial_number);