class ChangeSet:
    def __init__(self) -> None:
        self.added : list[dict[str, str]] = {}
        self.deleted : list[dict[str, str]] = {}
        self.updated : list[dict[str, str]] = {}

    def add(self, type: str, id: str) -> None:
        self.added.append({ 'type': type, 'id': id })

    def delete(self, type: str, id: str) -> None:
        self.deleted.append({ 'type': type, 'id': id })

    def update(self, type: str, id: str, property: str) -> None:
        self.updated.append({ 'type': type, 'id': id, 'property': property })