Feature Pack: YU06-eod-price-production

Status: Implemented Track: architecture Lineage role: optional Previous state: YU05-post-trade-compliance

This pack defines end-of-day price production and an overnight batch dependency chain on top of the YU05-post-trade-compliance baseline.

Primary intent:

• produce an official, versioned, immutable closing-price snapshot per trading session,
• gate all downstream overnight jobs behind one durable event rather than a "read latest price" race,
• fail safe: hold back publication on a data-quality flag, hold back a consumer's account on a missing/flagged holding,
• drive one real downstream consumer (EOD position marks / P&L) end to end.

Core artifacts:

• spec.md
• requirements/functional-delta.md
• requirements/nonfunctional-delta.md
• research.md
• data-model.md
• quickstart.md
• contracts/contract-delta.md
• system/architecture.model.json
• system/architecture.md
• system/runtime-topology.md
• system/messaging-subject-map.md
• system/adr-026-last-trade-close-versioned-immutable-snapshot.md
• system/adr-027-jetstream-event-chain-orchestration.md
• system/adr-028-producer-consumer-split-failsafe.md
• generation/generation-hook.md
• generation/implementation-status.md

Target runtime behavior:

• Producer runs inside trade-processor, reading the existing price feed and writing its own versioned tables.
• Consumer runs inside position-service, subscribing to the gate event and writing its own immutable results table.
• Everything else (deploy/runtime harness, observability stack) is inherited unchanged from YU05-post-trade-compliance.