CORE · Day 1-2
Ticketmaster
21 live canonical headings disposed. Overview links only to project home; section anchors live on daily pages and production record.
本周项目角色
周级 overview 不放 Hello/DDIA subsection fragments；exact anchors 在 daily pages。
FULL · Day 3-4
Online Auction
20 live canonical headings disposed. Overview links only to project home; section anchors live on daily pages and production record.
FULL · Day 5
Robinhood
20 live canonical headings disposed. Overview links only to project home; section anchors live on daily pages and production record.
Week 5 trace contract
TicketmasterWinning transaction: held->sold on one seat/order version. Duplicate failure: same reserve/checkout idempotency key returns one hold/order or stale-version rejection.
Online AuctionWinning transaction: accepted bid in per-auction order wins at close. Duplicate failure: same bidId does not create a second bid or bump current highest twice.
RobinhoodWinning transaction: order intent persists, exchange submission maps to one externalOrderId, execution updates order state. Duplicate failure: retry converges via clientOrderId and reconciliation.
时间线
2026-08-24 · MON
Day 1: Ticketmaster HLD：seat、hold、order 与 payment 的权威边界
Ticketmaster HLD：seat/hold/order/payment 状态机，reserve 与 confirm 两个 API，winning seat transaction trace。
进入2026-08-25 · TUE
Day 2: Ticketmaster deep dives：reservation TTL、热门演出、搜索缓存与不超卖
Ticketmaster deep-dive matrix：reservation, read scale, high-demand UX, search, query caching 各含 invariant/failure/recovery/metrics。
进入2026-08-26 · WED
Day 3: Online Auction：bid ledger、current highest bid 与强一致 HLD
Online Auction 30m attempt + HLD：Auction/Item/Bid/User、bid status、highest bid projection、winning bid trace。
进入2026-08-27 · THU
Day 4: Online Auction deep dives：ordering、durability、SSE 与 10M concurrent auctions
Online Auction follow-up sheet：strong consistency, durability, real-time highest bid, 10M scale, dynamic close。
进入2026-08-28 · FRI
Day 5: Robinhood：ordered market updates、order gateway 与 financial retry failure
Robinhood 35m attempt + follow-up：price stream sequence、order state machine、externalOrderId map、cleanup/reconciliation。
进入2026-08-29 · SAT
Day 6: Adaptive mock：Ticketmaster 45 分钟 + Auction/Robinhood pressure rounds
Ticketmaster mock evidence + Auction/Robinhood pressure notes；每题一条 winning transaction 和一条 duplicate failure trace。
进入2026-08-30 · SUN
Day 7: Week 5 synthesis：三域 winning transaction 与 duplicate/retry failure
Week 5 scorecard：all headings disposed, artifacts pass, mocks/follow-ups recorded, READY_FOR_REVIEW。
进入Artifacts
| Project | Chinese audio/script | English recall | Practice |
|---|---|---|---|
| Ticketmaster CORE | script · audio | script · PDF | 45m adaptive mock |
| Online Auction FULL | explainer · audio | outline | 30m attempt + follow-up |
| Robinhood FULL | explainer · audio | outline | 35m attempt + follow-up |
Applied AI radar
No frontier Applied AI item is scheduled. I found no official/original AI source that concretely changes Week 5 decisions about reservations, bid ordering, market-update delivery, idempotency, reconciliation, failure windows, recovery, or metrics. This omission is deliberate.
Detailed lecture notes, audio, recall scripts, PDFs, Staff Q&A, and mock packs are archived locally and are intentionally not published on this site.