Concepts

Cross-cutting models: position identity and the stale-price / sequencer reliability signals.

Cross-cutting models that apply across the NAV Calculator, price feeds, and balance adapters: how positions are identified in a stable, machine-readable way, and how a reading signals that it is unreliable (stale prices, an unhealthy quote asset, or a down L2 sequencer).

Position identity

The 3-level protocol taxonomy, the positionId / positionKind / isLocked fields, decode schemas, and the reconciliation key.

Stale prices & sequencer

Stale-feed handling, the quote-asset fallback, and the L2 sequencer uptime check.