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

{
   "params":[
      {
         "name":"required",
         "type":"bool",
         "default":false
      },
      {
         "name":"default",
         "type":"int"
      },
      {
         "name":"min",
         "type":"int"
      },
      {
         "name":"max",
         "type":"int"
      }
   ],
   "filter": true
}