CREATE TABLE IF NOT EXISTS customers (
  id SERIAL PRIMARY KEY,
  name TEXT NOT NULL,
  email TEXT UNIQUE NOT NULL,
  password_hash TEXT NOT NULL,
  company TEXT,
  phone TEXT,
  created_at TIMESTAMPTZ DEFAULT now()
);

CREATE TABLE IF NOT EXISTS support_messages (
  id SERIAL PRIMARY KEY,
  customer_id INT NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
  sender TEXT NOT NULL CHECK (sender IN ('customer', 'staff')),
  body TEXT NOT NULL,
  created_at TIMESTAMPTZ DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_support_messages_customer ON support_messages(customer_id);