espocrm-base/application/Espo/Resources/metadata/recordDefs/User.json

{
    "massActions": {
        "update": {
            "implementationClassName": "Espo\\Classes\\MassAction\\User\\MassUpdate"
        },
        "delete": {
            "implementationClassName": "Espo\\Classes\\MassAction\\User\\MassDelete"
        }
    },
    "readLoaderClassNameList": [
        "Espo\\Classes\\FieldProcessing\\User\\LastAccessLoader"
    ]
}