INSERT INTO app_settings(key, value_json, value_type, title, description, category)
VALUES
  ('vk_poster_refresh_token', '""'::jsonb, 'secret', 'VK OAuth refresh token', 'Refresh token from VK ID code flow. Used by VK poster to renew access token automatically.', 'VK Poster'),
  ('vk_poster_token_device_id', '""'::jsonb, 'str', 'VK OAuth device id', 'VK ID device_id returned with authorization code/token exchange.', 'VK Poster'),
  ('vk_poster_token_expires_at', '""'::jsonb, 'str', 'VK access token expires at', 'UTC ISO timestamp used by VK poster to refresh the access token before expiry.', 'VK Poster')
ON CONFLICT (key) DO NOTHING;