BEGIN;

CREATE TABLE IF NOT EXISTS device_push_tokens (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token text NOT NULL UNIQUE,
  platform text NOT NULL CHECK (platform IN ('android','ios','web')),
  device_name text,
  device_model text,
  app_version text,
  is_active boolean NOT NULL DEFAULT true,
  last_seen_at timestamptz NOT NULL DEFAULT NOW(),
  created_at timestamptz NOT NULL DEFAULT NOW(),
  updated_at timestamptz NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_device_push_tokens_user_active
  ON device_push_tokens(user_id, is_active);

COMMIT;