text: CREATE TABLE IF NOT EXISTS subscribers (
    user_id          VARCHAR(36) PRIMARY KEY,
    created_at       TIMESTAMP DEFAULT CURRENT_TIMESTAMP
  );
  CREATE INDEX subscribers_user_id ON subscribers (user_id);
  
  CREATE TABLE `items` (
      `id`    INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE,
      `item_id`   TEXT NOT NULL UNIQUE,
      `name`  VARCHAR(64),
      `desc`  VARCHAR(1024),
      `ref`   VARCHAR(1024),
      `created_at`    TIMESTAMP NOT NULL,
      `urls`  TEXT,
      `service_name`  VARCHAR(64) NOT NULL
  )
  CREATE INDEX items_item_id ON items (item_id);
  
  