espocrm-base/application/Espo/Resources/metadata/entityDefs/UserData.json

{
    "fields": {
        "auth2FA": {
            "type": "bool"
        },
        "auth2FAMethod": {
            "type": "enum"
        },
        "auth2FATotpSecret": {
            "type": "varchar",
            "maxLength": 32
        },
        "auth2FAEmailAddress": {
            "type": "varchar"
        }
    },
    "links": {
        "user": {
            "type": "belongsTo",
            "entity": "User"
        }
    }
}