Function parse_candle_bar 

pub fn parse_candle_bar(
    bar_type: BarType,
    instrument: &InstrumentAny,
    candle: &DydxCandle,
    timestamp_on_close: bool,
    ts_init: UnixNanos,
) -> DydxWsResult<Bar>

Parses a single candle into a [Bar].

When timestamp_on_close is true, ts_event is set to bar close time (started_at + interval). When false, uses the venue-native open time.

Errors

Returns an error if OHLCV/timestamp parsing fails.