Function parse_orderbook_quote 

pub fn parse_orderbook_quote(
    msg: &BybitWsOrderbookDepthMsg,
    instrument: &InstrumentAny,
    ts_init: UnixNanos,
) -> Result<QuoteTick>

Parses a depth-1 order book snapshot into a [QuoteTick].

Errors

Returns an error if the depth or message type differs, a side is missing, or price or size data is invalid.