Struct DepthLadder 

pub struct DepthLadder {
    pub instrument: Instrument,
    pub bids: Vec<DepthLevel>,
    pub asks: Vec<DepthLevel>,
    pub event_time: Option<DateTime<Utc>>,
    pub received_time: DateTime<Utc>,
    pub change_id: Option<u64>,
}

A normalized order-book depth snapshot for one Instrument (docs/01-domain-model.md §5) — a DOMAIN type (a provider emits it via MarketUpdate::Depth), never a UI type.

Only depth-capable providers populate it (Deribit option instruments; Alpaca crypto-spot only, which is outside the v1 option-chain product; IG unverified-pending-fixture — see docs/03-data-providers.md). Others never emit it and the depth screen renders its empty state. Levels are best-first. Carries the two clocks of §5.1 plus an optional venue sequence id.

Fields

instrument: Instrument

The provider-agnostic identity this book applies to (issue #4).

bids: Vec<DepthLevel>

Bid levels, best-first (highest price at index 0).

asks: Vec<DepthLevel>

Ask levels, best-first (lowest price at index 0).

event_time: Option<DateTime<Utc>>

The venue’s book timestamp — Some only when the feed carries one (§5.1).

received_time: DateTime<Utc>

When ChainView normalized this snapshot — always present (§5.1).

change_id: Option<u64>

The upstream sequence / change id for gap detection and resync (Deribit), or None when the feed carries no sequence. Consumed by the depth path in v0.5; carried now.

Trait Implementations

impl Clone for DepthLadder

fn clone(&self) -> DepthLadder

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DepthLadder

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.