Global vs per-channel content

{
  "type": "schedule",
  "date": "2026-09-01T09:00:00Z",
  "posts": [
    {
      "integration": { "id": "CHANNEL_A" },
      "value": [{ "content": "The long version, for LinkedIn." }]
    },
    {
      "integration": { "id": "CHANNEL_B" },
      "value": [{ "content": "The short version." }]
    }
  ]
}