{
  "synthetic": true,
  "records": 5,
  "unique_message_id_values": 4,
  "unique_chat_message_pairs": 5,
  "empty_texts": 1,
  "multiline_texts": 1,
  "note": "DEMO-CHAT-A/B are fictitious source labels, not valid Telegram IDs. The sample combines two hypothetical exports; the script reads one source per run."
}