generated from coulomb/repo-seed
tegwick
d2c73b02d9
WP-0009 git-backed DecisionLog + per-space append authority (keystone backing); WP-0010 derived views (wikilinks, BackLinks, RecentChanges, AllPages/SiteMap); WP-0011 incremental union + equivalence index + I-2 verification; WP-0012 second adapter (git-IS-store) validating the contract on a new substrate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
105 lines
3.5 KiB
Markdown
105 lines
3.5 KiB
Markdown
---
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id: SHARD-WP-0011
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type: workplan
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title: "incremental union maintenance + equivalence index + I-2 verification"
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domain: whynot
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repo: shard-wiki
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status: active
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owner: tegwick
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topic_slug: whynot
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created: "2026-06-15"
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updated: "2026-06-15"
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depends_on:
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- SHARD-WP-0007
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- SHARD-WP-0010
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---
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# SHARD-WP-0011 — Incremental union + equivalence index
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## Goal
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Replace direct, recompute-on-read resolution with the **incremental-first** derived tier from
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`CoreArchitectureBlueprint` §8.7: change-driven delta maintenance of the union/indexes, an
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**indexed equivalence** path (blocking/LSH, not O(N²)) with correct retraction/propagation
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(review B-4), and the **I-2 verification** mechanism (digest + background consistency-checker).
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Rebuild becomes a bounded fallback, not the operational path.
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**Non-goal:** distributed maintenance; persisted on-disk index store (in-memory derived tier is
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fine for this slice). Per-tenant partitioning (I-13) is honoured structurally but multi-tenant
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deployment is later.
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## Context
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- Spec: blueprint §8.7 (incremental, blocking/LSH, rebuild-as-fallback), §8.4; review B-4 +
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open items O-1/O-4.
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- Builds on union resolution (SHARD-WP-0007) and the views (SHARD-WP-0010) it accelerates.
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---
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## Equivalence index: blocking + verify
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```task
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id: SHARD-WP-0011-T1
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status: todo
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priority: high
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```
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A candidate-generation (**blocking**) layer — normalized title/path buckets + MinHash/LSH bands
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over content shingles — then **verify** (fingerprint / span-set overlap + curator bindings) to
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produce equivalence edges. Replaces pairwise O(N²). Tests: near-duplicates bucket together;
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unrelated pages don't; verified edges match a brute-force oracle on a small corpus.
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## Incremental maintenance (delta, not additive)
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```task
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id: SHARD-WP-0011-T2
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status: todo
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priority: high
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```
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Change-driven delta updates: a changed/added/removed page **re-buckets**, then (per B-4)
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**retracts** edges it leaves, **adds** edges it enters, and **propagates** to equivalence
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neighbours (a retraction can split a chorus set). Drives union/BackLinks/RecentChanges deltas.
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Tests: add/edit/remove keep the index equal to a from-scratch rebuild; a bucket-exit retracts a
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stale edge.
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## I-2 verification: digest + consistency-checker
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```task
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id: SHARD-WP-0011-T3
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status: todo
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priority: high
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```
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A per-partition **Merkle-style digest** of the derived tier, maintained alongside deltas, and a
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**background consistency-checker** that recomputes a sampled fold and compares; mismatch →
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**scoped recompute** of the affected region (self-healing). Makes `derived = f(canonical)`
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*verified*, not asserted. Tests: induced drift is detected and repaired; digest stable under
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equivalent event orders.
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## Wire incremental tier behind resolution + views
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```task
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id: SHARD-WP-0011-T4
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status: todo
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priority: medium
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```
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Route `UnionGraph.resolve` and the SHARD-WP-0010 views through the maintained index (rebuild =
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explicit fallback). Behaviour is unchanged from the consumer's view; only freshness/cost change.
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Update SCOPE; `pytest` + pyflakes green.
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---
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## Acceptance criteria
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- Equivalence is indexed (blocking/LSH + verify), not pairwise; matches a brute-force oracle.
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- Incremental maintenance (with retraction + propagation) keeps the derived tier equal to a
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from-scratch rebuild; rebuild is a bounded fallback.
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- I-2 is verified by a digest + consistency-checker that detects and self-heals drift.
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- Consumer-visible resolution/views behaviour unchanged; `pytest` + pyflakes green; synced.
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## Suggested task order
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T1 equivalence index → T2 incremental maintenance → T3 I-2 verification → T4 wiring.
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