Function require_ohlcv_columns

crates/openquant/src/data_processing.rs:66–71

(df: &DataFrame)

}

fn require_ohlcv_columns(df: &DataFrame) -> Result<(), String> {
    for name in ["symbol", "ts_us", "open", "high", "low", "close", "volume", "adj_close"] {
        df.column(name).map_err(|e| format!("missing required column '{name}': {e}"))?;
    }
    Ok(())
}

fn sort_ohlcv_df(df: &DataFrame) -> Result<DataFrame, String> {
    df.sort(