[Feature request] Allow comments in JSON body

The body of requests often contain IDs which may be hard to distinguish between. Being able to append a comment with a description to a row would often be of practical value.

Example:

{
  "command": "refresh",
  "user_ids": [
    9842509438, // username steve74
    4581013095, // username nyancat
    609582939   // username wegetitnow
  ]
}