curl --request POST \
  --url https://api.ontora.com/v1/projects/{project_id}/sync/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "node_keys": [],
  "edge_keys": [],
  "synced_by": "<string>"
}
'

{
  "nodes": [
    {
      "prj_key": "<string>",
      "action": "<string>",
      "name": "<string>",
      "node_type": "<string>",
      "target_ukl_key": "<string>",
      "target_ukl_label": "<string>",
      "existing_ukl_key": "<string>",
      "existing_ukl_name": "<string>"
    }
  ],
  "edges": [
    {
      "edge_key": "<string>",
      "action": "<string>",
      "from_name": "<string>",
      "to_name": "<string>",
      "rel_type": "<string>",
      "from_synced": true,
      "to_synced": true,
      "from_ukl_key": "<string>",
      "to_ukl_key": "<string>"
    }
  ]
}