IGPAPI
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    Variable DirectInboxThreadSchemaConst

    DirectInboxThreadSchema: Struct<
        {
            is_group: Boolean;
            last_activity_at: String;
            muted: Boolean;
            preview: $Array<
                Struct<
                    {
                        item_id: String;
                        item_type: String;
                        media: optionalKey<
                            Union<
                                readonly [
                                    Struct<
                                        {
                                            height: Number;
                                            media_type: Literal<(...)>;
                                            pk: String;
                                            url: String;
                                            width: Number;
                                        },
                                    >,
                                    Struct<
                                        {
                                            height: Number;
                                            media_type: Literal<(...)>;
                                            pk: String;
                                            url: String;
                                            width: Number;
                                        },
                                    >,
                                    Struct<
                                        {
                                            media_type: Literal<(...)>;
                                            pk: String;
                                            slides: $Array<(...)>;
                                        },
                                    >,
                                ],
                            >,
                        >;
                        text: optionalKey<String>;
                        timestamp: String;
                        user_id: String;
                    },
                >,
            >;
            thread_id: String;
            thread_title: String;
            thread_v2_id: String;
            users: $Array<Struct<{ full_name: String; pk: String; username: String }>>;
        },
    > = ...

    One thread of the inbox list: the preview the snapshot carries, and the participants.