4d5c49090c
Closes the self-iteration loop from the PRD reframe: an agent can
tune HNSW configs autonomously and the winner flows through to the
next profile activation without human intervention.
Three primitives:
1. PromotionRegistry (vectord::promotion)
- Per-index current + history at _hnsw_promotions/{index}.json
- promote(index, entry) atomically swaps current, pushes prior
onto history (capped at 50)
- rollback() pops history back onto current; clears current if
history exhausted
- config_or(index, default) — the read side used at build time,
returns promoted config if set else caller's default
- Full cache + persistence; writes are durable on return
2. Autotune (vectord::autotune)
- run_autotune(request, ...) — synchronous agent loop
- Default grid: 5 configs covering the practical range
(ec=20/40/80/80/160, es=30/30/30/60/30) with seed=42 for
reproducibility
- Every trial goes through the existing trial-journal pipeline
so autotune runs land alongside manual trials in the
"trials are data" log
- Winner: max recall first, then min p50 latency; must clear
min_recall gate (default 0.9) or no promotion happens
- Config bounds (ec ∈ [10,400], es ∈ [10,200]) reject absurd
values from the request's optional custom grid
- On winner: promote with note "autotune winner: recall=X p50=Y"
3. Wiring
- VectorState gains promotion_registry
- activate_profile now calls promotion_registry.config_or(...)
so newly-promoted configs are picked up on next activation —
the "hot-swap" is: autotune promotes -> profile activates ->
HNSW rebuilt with new config
- New endpoints:
POST /vectors/hnsw/promote/{index}/{trial_id}
?promoted_by=...¬e=...
POST /vectors/hnsw/rollback/{index}
GET /vectors/hnsw/promoted/{index}
POST /vectors/hnsw/autotune { index_name, harness,
min_recall?, grid? }
End-to-end verified on threat_intel_v1 (54 vectors):
- autogen harness 'threat_intel_smoke' (10 queries)
- POST /autotune -> 5 trials in 620ms, winner ec=20 es=30
recall=1.00 p50=64us auto-promoted
- Manual promote of ec=80 es=30 -> history depth 1
- Rollback -> back to ec=20 es=30 autotune winner
- Second rollback -> current cleared
- Re-promote + restart -> persistence verified
- Profile activation after promotion logged:
"building HNSW ef_construction=80 ef_search=30 seed=Some(42)"
proving the hot-swap loop is closed.
Deferred:
- Bayesian optimization (random-grid is fine at this config-space size)
- Append-triggered autotune (Phase 17.5 — refresh OnAppend policy
can schedule autotune after appending sufficient new rows)
- Concurrent autotune per index guard (JobTracker integration)
PRD invariants satisfied: invariant 8 (hot-swappable indexes) is now
real code — promote is atomic, rollback is always available, the
active generation is a persistent pointer not a runtime convention.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>