curl --request POST \
  --url http://localhost:8080/api/tags/add \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "bot_id": 1,
  "chat_id": -100123456789,
  "user_id": 987654321,
  "username": "alice",
  "tag": "VIP",
  "color": "#FFD700"
}
'

{
  "id": 123,
  "chat_id": 123,
  "user_id": 123,
  "username": "<string>",
  "tag": "<string>",
  "color": "<string>",
  "created_at": "2023-11-07T05:31:56Z"
}