espocrm/schema/metadata/app/recordId.json

{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "https://www.espocrm.com/schema/metadata/app/recordId.json",
    "title": "app/recordId",
    "description": "Record ID definitions.",
    "type": "object",
    "properties": {
        "type": {
            "enum": [
                "id",
                "uuid4"
            ],
            "description": "A type of generated IDs."
        },
        "length": {
            "type": "integer",
            "description": "ID column length. By default, set to 17."
        },
        "dbType": {
            "description": "An ID column data type. By default, set to string (equivalent to varchar in MySQL). Changing this parameter will change types of all ID columns once you run rebuild.",
            "anyOf": [
                {"type": "string"},
                {
                    "enum": [
                        "string",
                        "uuid"
                    ]
                }
            ]
        }
    }
}