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

{
    "fields": {
        "id": {
            "type": "id",
            "dbType": "integer",
            "autoincrement": true
        },
        "entityType": {
            "type": "varchar",
            "maxLength": 100,
            "index": true
        },
        "user": {
            "type": "link"
        }
    }
}