sample_df.proto

syntax = "proto3";

message DataFrame {
    message Index {
        string datetime = 1; // ISO 포맷의 날짜와 시간 문자열
    }

    repeated Index index = 1;

    message Column {
        string name = 1;
        repeated double values = 2;
    }

    repeated Column columns = 2;
}

service DataFrameService {
    rpc GetDataFrame(Empty) returns (DataFrame);
    rpc SendDataFrame(DataFrame) returns (Empty);
}

message Empty {}