old_contents: metadata = {
      "sample_name": "",
      "group_name": "",
      "file_names": "",
      "sequencing_platform": "",
      "sequencing_type": "",
      "pre_assembled": "",
      "sample_type": "",
      "organism": "",
      "strain": "",
      "subtype": {},
      "country": "",
      "region": "",
      "city": "",
      "zip_code": "",
      "longitude": "",
      "latitude": "",
      "location_note": "",
      "isolation_source": "",
      "source_note": "",
      "pathogenic": "",
      "pathogenicity_note": "",
      "collection_date": "",
      "collected_by": "",
      "usage_restrictions": "",
      "release_date": "",
      "email_address": "",
      "notes": "",
      "batch": "true"
  }
  
  default = {
      "mandatory": [
          "pre_assembled",
          "sequencing_platform",
          "sequencing_type",
          "country",
          "isolation_source",
          "collection_date"
      ],
      "seed": {
          "pre_assembled": "no",
          "sample_type": "isolate",
          "organism": "",
          "pathogenic": "yes",
          "usage_restrictions": "public",
          "usage_delay": "0"
      }
  }
  
new_contents: metadata = {
      "sample_name": "",
      "group_name": "",
      "file_names": "",
      "sequencing_platform": "",
      "sequencing_type": "",
      "pre_assembled": "",
      "sample_type": "",
      "organism": "",
      "strain": "",
      "subtype": {},
      "country": "",
      "region": "",
      "city": "",
      "zip_code": "",
      "longitude": "",
      "latitude": "",
      "location_note": "",
      "isolation_source": "",
      "source_note": "",
      "pathogenic": "",
      "pathogenicity_note": "",
      "collection_date": "",
      "collected_by": "",
      "usage_restrictions": "",
      "release_date": "",
      "email_address": "",
      "notes": "",
      "batch": "true"
  }
  
  default = {
      "mandatory": [
          "sequencing_platform",
          "sequencing_type",
          "collection_date"
      ],
      "seed": {
          "pre_assembled": "no",
          "country": "unknown",
          "isolation_source": "unknown",
          "sample_type": "isolate",
          "organism": "",
          "pathogenic": "yes",
          "usage_restrictions": "public"
      }
  }
  
subject: update default metadata