pub fn calculate_contingency_margin_at(
snapshot: &PortfolioMarginSnapshot,
config: &PortfolioMarginConfig,
now_ts: i64,
) -> Result<ContingencyMargin, MarginError>pub fn calculate_contingency_margin_at(
snapshot: &PortfolioMarginSnapshot,
config: &PortfolioMarginConfig,
now_ts: i64,
) -> Result<ContingencyMargin, MarginError>