Start an import run over a set of uploaded files

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{
  "chunksDone": 123,
  "chunksFailed": 123,
  "chunksRunning": 123,
  "chunksTotal": 123,
  "completedAt": "<string>",
  "createdAt": "<string>",
  "entityCount": 123,
  "error": "<string>",
  "fileIds": [
    "<string>"
  ],
  "files": [
    {
      "chunksDone": 123,
      "chunksFailed": 123,
      "chunksTotal": 123,
      "fileId": "<string>",
      "filename": "<string>",
      "kind": "pdf_page"
    }
  ],
  "inputTokens": 123,
  "noteCount": 123,
  "outputTokens": 123,
  "paused": true,
  "phase": "queued",
  "relationshipCount": 123,
  "runId": "<string>",
  "status": "waiting"
}