class_docstr: RedisTimeSeries Commands.
docstr: Append TIMESTAMP property to params.
code: def _append_timestamp(params: List[str], timestamp: Optional[int]):
      """Append TIMESTAMP property to params."""
      if timestamp is not None:
          params.extend(["TIMESTAMP", timestamp])
  
imports: from typing import Dict, List, Optional, Tuple, Union
  from redis.exceptions import DataError
  from redis.typing import KeyT, Number
label_desc: Use image node_id 26 for calling the TimeSeriesCommands obj's underlying member method code with example usage: obj._append_timestamp(params, timestamp) without return types