espocrm-base/application/Espo/Resources/metadata/fields/rangeInt.json

{
   "actualFields": [
      "from",
      "to"
   ],
   "fields": {
      "from": {
         "type": "int"
      },
      "to": {
         "type": "int"
      }
   },
   "naming": "prefix",
   "mergable": false,
   "notCreatable": true,
   "filter": false,
   "fieldDefs": {
      "notStorable": true
   }
}