curl --request POST \
  --url 'https://scan.sv-1.global.canton.network.sync.global/api/scan/v0/backfilling/migration-info' \
  --header 'Content-Type: application/json' \
  --data '{"migration_id":0}'

{
  "previous_migration_id": 0,
  "record_time_range": [
    {}
  ],
  "last_import_update_id": "string",
  "complete": false,
  "import_updates_complete": false
}