@@ -0,0 +1,9 @@
+---
+'@objectstack/skills': patch
+---
+
+docs(skills): the `objectstack-data` indexing rule's partial-index example teaches the rule with an application-shaped index instead of restating the platform's overlay uniqueness key (#23039)
+
+Clause-②: no
+
+`skills/objectstack-data/rules/indexing.md`'s "Access methods and partial indexes" section illustrated a partial index with the platform's own overlay-uniqueness DDL and said that was what `ensureOverlayIndex` runs. The quoted key had four parts; the platform's runtime key has carried a fifth, `bundle_member`, since protocol 18, so the sentence stated something the platform no longer runs. The example is re-cut to an application-shaped partial index — one *active* subscription per account, the coarse `{ fields: ['account_id'] }` declared in metadata and the unique partial form built in a migration — so the rule is taught without restating a platform key that changes on its own schedule. The rule itself is unchanged: declare the coarse index (or none) in metadata, build the partial form as raw SQL in a runtime migration, fall back to a plain index on a dialect that rejects the predicate. Nothing an author writes changes.
@@ -666,9 +666,10 @@ binding `P` against the packaged owner's id `O`:
 
 The last row is a real decision, not bookkeeping, and the reason is a store
 asymmetry worth recording: the overlay-uniqueness index keys on
-`(type, name, organization_id, COALESCE(package_id, ''))` (ADR-0005 amendment
-2026-08-09, #6825), so `sys_metadata` can legitimately hold two active rows for
-one `(type, name)` bound to two packages. For every other type that is fine —
+`(type, name, organization_id, COALESCE(package_id, ''), COALESCE(bundle_member, ''))`
+(ADR-0005, amended 2026-08-09 by #6825 and 2026-10-12 by #22877 ruling A — see its
+"What delivers overlay uniqueness today"), so `sys_metadata` can legitimately hold
+two active rows for one `(type, name)` bound to two packages. For every other type that is fine —
 two packages really can ship `page/home`. For `object` it is not representable:
 `computeFQN` is identity, so the registry holds exactly one entry per object name
 and could never serve two. Refusing the mis-bound row is what keeps the two
 
@@ -310,8 +310,9 @@ contract they consume.
 
 - **New machine name, mandatory** (the #11513 shape exactly). ⛔ No same-name clone in a second
   package: storage legitimately holds both — the uniqueness index keys on
-  `(type, name, organization_id, COALESCE(package_id, ''))` (ADR-0005 amendment, #6825; ADR-0048
-  governs the cross-package coexistence) — and the engine's name-keyed flow map makes the winner
+  `(type, name, organization_id, COALESCE(package_id, ''), COALESCE(bundle_member, ''))`
+  (ADR-0005, amended 2026-08-09 by #6825 and 2026-10-12 by #22877 ruling A; ADR-0048 governs the
+  cross-package coexistence) — and the engine's name-keyed flow map makes the winner
   insertion-order: measured as a silent, non-deterministic replacement (#11665 §2.2; #11997
   tracks the shadow diagnostics independently of this model).
 - **Whole-definition copy — ⛔ never param-list assembly.** The clone copies the parsed
 
@@ -156,19 +156,19 @@ the dialect you are actually running.
 **Partial index (`CREATE INDEX … WHERE <predicate>`).** Supported on Postgres
 and SQLite (≥ 3.8.9), absent on MySQL. Because it cannot be expressed
 portably — and because knex's index builders have no way to emit a predicate —
-it is issued as raw SQL from a runtime migration. The platform does exactly
-this for its own overlay uniqueness: `metadata-protocol`'s `ensureOverlayIndex`
-runs
+it is issued as raw SQL from a runtime migration, falling back to a plain
+index on a dialect that rejects it. One *active* subscription per account,
+the coarse `{ fields: ['account_id'] }` declared in metadata:
 
 ```sql
-CREATE UNIQUE INDEX IF NOT EXISTS idx_sys_metadata_overlay_active
-  ON sys_metadata (type, name, organization_id, COALESCE(package_id, ''))
-  WHERE state = 'active';
+CREATE UNIQUE INDEX IF NOT EXISTS idx_subscription_account_active
+  ON subscription (account_id)
+  WHERE status = 'active';
 ```
 
-with a plain-index fallback for dialects that reject the predicate. Follow that
-shape: declare the coarse index (or none) in metadata, and build the partial
-form in a migration.
+Follow that shape: declare the coarse index (or none) in metadata, and build
+the partial form in a migration, as the platform does for its own overlay
+uniqueness.
 
 **Benefits of a partial index, when you do build one:**
 - Smaller index size