Delete all user messages

curl --request POST \
  --url https://api.fluxer.app/v1/admin/messages/delete-all \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "<string>",
  "dry_run": true
}
'

{
  "success": true,
  "dry_run": true,
  "channel_count": 1073741823,
  "message_count": 1073741823,
  "job_id": "<string>"
}