text: ALTER TABLE paste RENAME TO _paste_old;
  
  CREATE TABLE paste (
    `id`           TEXT PRIMARY KEY NOT NULL,
    `filename`     TEXT NOT NULL,
    `content`      TEXT NOT NULL,
    `create_time`  DATETIME NOT NULL,
    `expire_after` INTEGER DEFAULT 0,
    `expire_time`  DATETIME NULL
  );
  
  INSERT INTO paste(id, filename, content, create_time, expire_after, expire_time)
  SELECT id, filename, content, create_time, expire_after, expire_time
  FROM _paste_old;
  
  DROP TABLE _paste_old;
  