def has(asin): return asin and _db.list_last_read(asin, 1)
def get_last_read(asin): llr = _db.list_last_read(asin, 1) return llr[0] if llr else None
def get_last_read(asin, device=None): llr = _db.list_last_read(asin, 1, device) return llr[0] if llr else None