Lesson 4: Keeping a vector index correct while it changes
21 min read·13 Oct 2026
Module 5 · Lesson 4 · About 50 minutes · Needs: Lesson 2 (stores and upsert), Module 4 Lesson 4 (model versions, aliases)
The situation
On Thursday 8 October Hannah withdrew bulletin SB-114: firmware 2.3 caused a new fault. The prototype's log shows "k50 wont pair" returning SB-114 third on 30 September, and nothing in the prototype would ever remove it.
Grace wants the batch applied and proof that SB-114 is gone. Kwame wants a rebuild without an outage; Farah asks what happens if the index is lost; Owen asks what it costs. The Hollin data is simulated.