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feat(plugin-page-builder): backfill the usage index, so a count can be exact - #1720
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…e exact
The write hooks maintain the indexes going FORWARD, and nothing filled them for
documents that already existed. A site that installed this plugin over existing
content held a table whose every answer is "references nothing" — the answer a
delete decision acts on, and indistinguishable from a component genuinely used
nowhere. The count shipped with `coversExistingDocuments` false unconditionally
for that reason; this is what makes it answerable.
A sweep does the filling. Nobody can enqueue it: the work is owed from the
moment the plugin meets existing content, and the events that make it owed are
not things any handler sees.
Four properties, each one a way the first version was wrong.
A scope is recorded only after its walk resolves AND reports nothing unrepaired
or undetermined. `rebuildPageBuilderUsageIndexes` RESOLVES on a partial repair —
it returns what happened, because it is also run as a repair where a caller
wants the counts — and a backfill cannot use that answer the same way, since the
next thing it does is write a row that no later pass revisits. Refusing only on
`failure` would leave the narrower version of the same defect.
It pages by KEYSET. Deleting a document the walk has already passed shifts
everything behind it back, so an offset walk never visits the row that crosses
the boundary. A repair survives that — the missed document keeps the rows it had
and the orphan sweep will not remove them unconfirmed — and a first fill does
not, because it has no rows for anything to protect. Resuming after the last id
seen means position no longer decides the next page.
Collections come from the live REGISTRY. `class-usage-hook` opens by saying the
set is not known when a plugin is wired, which is why the write path registers
on a wildcard; the Schema Builder creates collections at runtime and those exist
only in the registry. Reading configuration instead walked a narrower population
than the hooks maintain, while judging readiness against that same short list.
The listing is paginated, so it is exhausted rather than assumed to fit, and a
page it cannot parse is a refusal rather than a short answer.
Progress belongs to a GENERATION derived from the bounds. Changing
`pageBuilder({ limits })` changes what every row should say, and both directions
are wrong differently: lowering `maxNodes` leaves rows for nodes the renderer no
longer reaches, raising it leaves unreadable markers standing so every count is
a floor for ever — which reads as the flag working rather than as stale state.
The generation sits beside the scope key rather than inside it, so the identity
stays put and a re-walk reconciles the old rows instead of orphaning them.
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📝 WalkthroughWalkthroughAdds a scope-based usage-index backfill with generation-aware progress, paged document rebuilding, plugin job wiring, and backfill-aware usage health reporting. ChangesUsage backfill system
Estimated code review effort: 4 (Complex) | ~60 minutes Sequence Diagram(s)sequenceDiagram
participant BackfillJob
participant BackfillHost
participant DocumentStore
participant ProgressStore
BackfillJob->>BackfillHost: resolve scopes and pass dependencies
BackfillJob->>DocumentStore: rebuild one outstanding scope
DocumentStore-->>BackfillJob: rebuild report
BackfillJob->>ProgressStore: record successful scope
BackfillJob-->>BackfillHost: continue or finish sweep
Merge Risk: 🟡 Moderate · up to The backfill can report exact coverage while content remains unindexed under two reachable edge cases. These correctness issues should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| * is the honest answer for a caller that genuinely cannot tell, and it is the | ||
| * direction that does not invite a delete. | ||
| */ | ||
| backfill?: { |
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A successful sweep cannot currently change the result seen by normal consumers: backfill is optional, and a repo-wide search at this commit finds no production caller supplying it, while the package entry point exports neither usageBackfillStateStore nor the scope enumerator needed to construct it. Existing callers therefore continue using { index, read }, receive coversExistingDocuments: false, and report every count as a floor even after the backfill finishes. Provide a plugin-bound health reader or otherwise supply these dependencies automatically rather than leaving the correct path inaccessible behind an optional argument.
AGENTS.md reference: AGENTS.md:L312-L314
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Confirmed, and this is the finding that mattered most — fixed at 81211a7b0.
Your search matches mine. backfill was optional, nothing outside the package could assemble the two values it needs, and the entry point exported neither the state store nor the scope enumerator. So every consumer took the conservative branch and a finished backfill changed nothing anybody could observe: the work ran, the sweep recorded every scope, and the answer stayed a floor for ever.
That is worse than a missing feature. The whole PR exists to make coversExistingDocuments answerable, and it was answerable only from inside the module that already knew.
A plugin-bound reader is contributed as a service (USAGE_HEALTH_SERVICE), reached through ctx.services.plugins the way BLOCK_SERVICE already is.
I chose that over exporting the pieces deliberately, and the reason is your own phrase — "leaving the correct path inaccessible behind an optional argument". Exporting usageBackfillStateStore and the enumerator would move the same problem one level out: a caller would then have to know which collections the registry holds and which generation the index was derived under, neither of which is knowable outside the installed context. The optional argument stays, because a caller that genuinely cannot supply it should still get the conservative answer rather than an exception — but it is no longer the only path.
Everything is resolved PER CALL rather than captured at install: a site can gain a collection or move its bounds between one render and the next, and a health answer built from install-time values describes the site as it was when the plugin loaded.
| const completed = await args.state.completed(); | ||
| const outstanding = args.scopes.find( | ||
| scope => !completed.has(backfillScopeKey(scope)) | ||
| ); |
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Once a scope key is recorded, this predicate prevents the sweep from ever rebuilding it again. On a backfilled site, a later post-commit index write failure—or the documented concurrent-save race in class-usage-hook.ts—can leave component rows missing while the completion row remains present; the health reader then reports the index whole, so an undercount can make a still-used component appear safe to delete. The ongoing maintenance path must invalidate or dirty the affected scope, or completed scopes need periodic reconciliation.
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Confirmed, verified against the code, and NOT fixed here — recorded instead as finding:pb6-backfill-completeness-cannot-survive-maintenance-drift. I want to give the reasoning rather than just the disposition, because you are right and I am still declining to fix it in this PR.
Everything you describe holds. Once a scope key is recorded for the current generation, advanceBackfill never revisits it. A post-commit index write failure, or the documented concurrent-save race in class-usage-hook.ts, leaves component rows missing while the completion row stands — and health then reports the index whole, so an undercount can make a still-used component look safe to delete.
The reason it is not fixed here is that the backfill answers a different question than the one being broken. It answers "has every scope been walked at least once, under the current bounds". Your case is "is the index CURRENTLY correct", and nothing about a first fill can establish that — the drift you name happens after the backfill finished and is caused by the ongoing maintenance path.
Both remedies you offer live in that path rather than in this one: maintenance must DIRTY the scope it failed on, or something must reconcile completed scopes periodically. Either is a change to the write path, with its own failure modes around a hook that has no transaction to enlist in — which is exactly what finding:usage-index-maintenance-races-concurrent-saves already records, and it already blocks safe delete for this reason.
Folding it in here would mean designing that inside a PR whose subject is a first fill, which is the shape that got this work split out of #1690 in the first place.
What I can say for the interim: the direction of the residual error is the dangerous one — an undercount — so I have not tried to argue it is harmless. The finding is recorded with that stated, and it names the two remedies and where they belong.
| scopes: readonly BackfillScope[], | ||
| completed: ReadonlySet<string> | ||
| ): boolean { | ||
| return scopes.every(scope => completed.has(backfillScopeKey(scope))); |
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Completion only verifies that every scope which exists now has a progress row. If a blocks field is removed, a locale is dropped, or drafts are disabled, that scope disappears from scopes, but its existing reference rows are never visited by rebuildPageBuilderUsageIndexes and no schema-change cleanup removes them. This expression can consequently return true while grouped usage counts still include references from content the site no longer renders, making supposedly exact counts permanently overstate usage.
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Confirmed, verified, and recorded as finding:pb6-backfill-leaves-rows-for-scopes-that-disappear rather than fixed here.
Your mechanism is exactly right: backfillComplete only asks that every scope which exists NOW has a progress row. Remove a blocks field, drop a locale, or disable drafts, and that scope leaves the enumeration — while its reference rows stay, unvisited by any rebuild and unremoved by any schema-change cleanup. Completeness can then report the index whole while grouped counts include references from content the site no longer renders.
One qualification that decides the priority rather than the validity. The residual error here OVERSTATES usage: a component looks more used than it is. For the decision this number informs — is it safe to delete or change — that is the recoverable direction, unlike every other finding on this PR, which undercount. That is why I am filing it rather than holding the PR, and I would rather say so plainly than imply it is fixed.
It is genuinely not small. Sweeping an orphaned scope's rows means noticing that the scope disappeared, and the plugin receives no schema-change signal today — the write hooks fire on document writes, not on a field being removed from a collection. So the fix needs either a signal that does not exist yet, or a periodic reconciliation that enumerates stored rows and compares them against the scopes that should exist, which is a second walk with its own bounds and its own budget.
Both of those are the same shape as the maintenance-drift finding beside this one, and I suspect they want to be answered together by whatever mechanism keeps a backfilled index honest over time, rather than separately inside a first fill.
| if ( | ||
| report.failure === undefined && | ||
| report.unrepaired === 0 && | ||
| report.undetermined === 0 |
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When any document exceeds the configured traversal bounds, rebuilding this scope deterministically reports undetermined > 0, and this condition throws even though reconciliation has already stored an unreadable marker. The scope is therefore never recorded: the job exhausts its retry budget, the next sweep is enqueued, and the entire collection is scanned again on every future drain, potentially monopolizing the shared job queue indefinitely. When there is no write/sweep failure or unrepaired document, record the scope and rely on the marker to keep health incomplete until a later save or limits-generation change makes the document readable.
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Confirmed, reproduced by reading my own code, and fixed at 81211a7b0. This one is a defect I introduced in the previous round, while fixing its exact opposite.
Last round's finding was that a partial rebuild was recorded as done. I fixed it by refusing on failure, unrepaired and undetermined — and said in the commit that refusing only on the first "would leave the narrower version of the same defect". That reasoning was right for two of the three and wrong for the third, in the direction you name.
Exceeding a walk bound is DETERMINISTIC. The same document exceeds it on every pass, so the scope could never be recorded, the sweep was re-queued for ever, and every drain rescanned the whole collection — a backfill that cannot finish, monopolising a queue it shares with every other job. I traded "recorded over a hole" for "never finishes", which is worse, because the first at least terminates.
The rule is now about whether the failure LEFT A TRACE, which is the distinction I was missing rather than a threshold I set wrongly:
failureandunrepairedleave nothing. A missing row is indistinguishable from a document that references nothing, so recording the scope hides a hole. These still refuse.undeterminedleaves anunreadableMARKER, andreadUsageIndexHealthreads those — so the index reports itself incomplete by a mechanism that survives the scope being recorded. Exactly as you say: the marker keeps health honest until a later save or a limits-generation change makes the document readable.
Break-verified against the previous implementation: restoring the undetermined === 0 clause fails the new case and leaves the two refusals green, so it discriminates on that clause rather than on refusal in general.
The decision is now its own exported function with its own test file, because driving it through the wiring ran a real rebuild against a fake database and answered a clean report whatever the case intended — a fixture that never reached the mechanism it named.
| export async function backfillScopes( | ||
| host: BackfillHost | ||
| ): Promise<readonly BackfillScope[]> { | ||
| const slugs = await host.collectionSlugs(); |
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This enumeration only reads the collection registry, so Singles containing blocks fields never contribute a scope and are never backfilled. Singles are a supported place for blocks content (the playground already renders blocks-backed Homepage and Landing Page Singles), and writeTargetOf also deliberately declines single: hooks, so their references are absent both before and after this sweep. On a site whose blocks content is wholly or partly in Singles, the collection scopes can all be recorded and health can report the index whole while a homepage still uses an unindexed component or class, allowing an unsafe deletion; enumerate and maintain Singles as well, or prevent completeness from becoming true while such Singles exist.
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Confirmed and fixed at 81211a7b0, by refusing completeness rather than by indexing Singles.
Your reading is right on every step, and the part worth stating is what CHANGED about it. That Singles are unindexable is already recorded here as a finding — writeTargetOf declines every single: hook, and write-target.ts says why: a plugin has no supported way to READ a Single, because the one available path CREATES the row when absent, so indexing would materialise every Single in the app as a side effect.
Before this PR that gap was inert. Every count was a floor unconditionally, so a Single's absence made no claim worse. The backfill is what turns it into a hazard: it lets coversExistingDocuments become true, and on a site whose homepage is a blocks-backed Single that is a confident claim about a population it never looked at. Playground already ships blocks-backed Homepage and Landing Page Singles, so this is not hypothetical.
So completeness now asks two questions rather than one, and they are genuinely different states:
- not yet walked — resolves on its own, as the sweep proceeds.
- cannot be walked — does not resolve until the plugin learns to reach it.
coversExistingDocuments requires both: every scope recorded, AND no content the index cannot cover. A declared Single carrying a blocks field makes the second false.
The DECLARATION is what is read, not the content: a Single nobody has filled in yet still means the index will not cover it once somebody does, and this answer must not flip the day an author first saves.
I did not take the other half of your suggestion — enumerating and maintaining Singles — deliberately. It needs a core read that does not materialise the row, which is a change to core rather than to this plugin, and it is already filed as finding:usage-index-never-sees-a-single blocking safe delete. Doing it here would mean inventing that read inside a plugin, which is the side effect the guard exists to prevent.
The Singles listing is exhausted rather than assumed to fit, and one it cannot parse answers TRUE — "I could not check" must not become "there is nothing to worry about".
Three findings, and the first two are the same mistake pointing in opposite directions. REFUSING an `undetermined` walk was wrong, and it was introduced here one round ago while fixing the opposite defect. `failure` and `unrepaired` leave no trace, so a scope recorded over one is recorded over a hole nobody can see — those must refuse. A document that exceeded its walk bound leaves an `unreadable` MARKER, and the health reader reads those, so the index already reports itself incomplete by a mechanism that survives the scope being recorded. Refusing it as well produced a worse failure than the one being fixed: exceeding a bound is DETERMINISTIC, so the scope could never be recorded, the sweep was re-queued for ever, and every drain rescanned the whole collection — a backfill that cannot finish, monopolising a queue it shares with every other job. The health reader could not SEE the backfill. Its state was an optional argument, nothing outside the package could assemble the two values it needs, and so every consumer took the conservative branch: a finished backfill changed nothing anybody could observe, and the answer stayed a floor for ever. The work ran and the flag it exists to flip was unreachable. A plugin-bound reader is contributed as a service, because what it needs is the installed context — which collections the registry holds, which generation the index was derived under — and handing a caller a function demanding both moves the same problem one level out. Completeness now also asks whether content exists that the index cannot cover AT ALL, which is a different state from "not yet walked" and has a different remedy. A Single's content cannot be indexed: a plugin has no supported way to READ one, so `writeTargetOf` declines every `single:` hook and no scope is ever enumerated. Without this, a site whose homepage is a blocks-backed Single has every collection scope recorded and is told the index is whole, while the component that homepage renders reads as used by nothing — which is the reading a delete acts on. An unwalked scope becomes walked; unreachable content stays unreachable until the plugin learns to reach it. Both new enumerations are exhausted rather than assumed to fit, and a listing that cannot be parsed answers the CONSERVATIVE way: "I could not check" must not become "there is nothing to worry about".
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| for (let page = 1; ; page += 1) { | ||
| const result = await nextly.find({ | ||
| collection: stateCollection, | ||
| where: { generation: { equals: generation } }, |
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When limits change from generation A to B and then back to A after B has rebuilt any scope, this query reuses A's old completion rows even though the shared usage indexes now contain B-derived rows. For example, lowering maxNodes for B removes references beyond that bound; reverting to the higher A bound immediately reports those scopes complete without restoring the removed references, so an undercount is presented as exact. Progress from an earlier generation cannot be reused unless the corresponding index snapshot is also restored; invalidate prior progress on every generation transition or force the scopes to be walked again.
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Confirmed, and this one overturns a decision I made deliberately and defended in a docblock. Fixed at 8ffae239b.
I kept other generations' rows on purpose, with the reasoning written beside them: the bounds are configuration rather than a migration, so a host moving them back should not pay for a full re-walk of progress that is "still true".
That reasoning is wrong, and your example is the cleanest possible statement of why. Progress is a claim about the INDEX, not about a walk in the abstract. Generation B did not merely exist alongside A — it MUTATED the shared indexes. Lowering maxNodes removed references beyond the new bound, so returning to A finds A's rows intact over an index those references are missing from, and reports an undercount as exact. The rows are only reusable if the index snapshot is restored with them, and nothing does that.
So a generation transition costs a re-walk in both directions now. That is the price of the answer meaning anything, and it is the correct trade — I was optimising a cost against a guarantee.
One implementation note that is load-bearing: the read is now UNFILTERED. Filtering by the current generation is what made the stale rows invisible, so a filtered read could never remove the very rows it has to remove — it would leave them for the next transition to reuse.
The deletes run AFTER the paging completes, for the reason the rebuild sweeps after its own walk: deleting during an offset-paged read shifts the rows behind it and the next page skips one. A delete that fails is swallowed and retried on the next pass, because a stale row surviving costs one repeat of the cleanup, while failing the pass would stop the backfill over bookkeeping — and the keys returned are already correct without it.
Break-verified: restoring the filter fails the discard test while the "keeps this generation's rows" control stays green, so it discriminates on the discard rather than on filtering in general.
| const id = (row as { id?: unknown }).id; | ||
| // A listed row with no usable id addresses nothing, so there is no | ||
| // subject to read it as. Skipped rather than refused: the alternative | ||
| // is failing a whole scope over one malformed row, and a scope that | ||
| // never completes is one the backfill retries for ever. | ||
| if (typeof id !== "string" || id.length === 0) continue; |
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When a collection's supported afterRead hook strips id from list results, this branch silently omits the document while allowing the scope to be recorded as complete. On the last page that creates no marker or failure, so the document's component references remain absent while health reports exact counts; on a non-final page it can also leave the keyset cursor unchanged and repeatedly fetch the same window until the page guard fails. Treat an unusable list identifier as a refused walk rather than skipping it.
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Confirmed and fixed at 8ffae239b. This is the second decision on this branch where I chose "skip" over "refuse" and had the asymmetry backwards.
The comment I wrote said skipping was the safe direction, because failing a whole scope over one malformed row seemed worse than losing the row. Losing it is worse, and silently: no rows are written for that document, no marker is left, the scope is recorded complete — and nothing later notices, because a document with no rows is indistinguishable from one that references nothing. That is the same equivalence every other finding on this PR turns on, and I reasoned past it here.
Your second half is the part I had not seen. The cursor advances to the last id SEEN, so a page ENDING in an unreadable row leaves it unchanged and the next read returns the same window — spinning until the page guard trips. So skipping is not merely lossy on the final page; it can also stall the walk on any other.
It refuses now, with the collection named so a log says where.
Worth recording that this is reachable rather than theoretical, which is the part that moved it from "defensive branch" to "defect": a collection's own afterRead hook is a supported feature and id is not exempt from what it may strip. So this is a configuration a host can arrive at without doing anything wrong.
Break-verified by restoring the continue, which fails the new case while the surrounding paging tests stay green.
| where: args.index.whereUndetermined(), | ||
| groupBy: "entityKey", | ||
| }); | ||
| const [markers, covers] = await Promise.all([ |
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When this health read overlaps the final backfill scope, the parallel marker query can observe no marker before an undetermined document is processed while the slower completion query observes the progress row written after that rebuild. The combined result is then coversExistingDocuments: true and anyUndetermined: false, briefly presenting an incomplete index as exact. Because the rebuild writes markers before recording completion, read completion first and only then probe markers so those two observations preserve that ordering.
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Confirmed and fixed at 8ffae239b. You are right, and the ordering you identify is exactly the invariant that makes the fix sound rather than merely different.
The rebuild writes its unreadable markers and THEN records the scope. Read in parallel, the two observations can come from either side of that write: the marker probe lands before a document is processed, the completion read lands after the row appears, and they combine into { coversExistingDocuments: true, anyUndetermined: false } — the one combination that presents an incomplete index as exact. Every other interleaving is safe, which is why it would be rare and why it would not show up in testing.
Reading completion first inverts the dependency: if completion is observed, every marker that scope produced was already written, so the probe that follows sees them. Worst case is now a floor reported a moment longer than necessary, which is the harmless direction.
I gave up the parallelism deliberately and want to be explicit that it is a cost, not a wash. These are two round trips that used to overlap, on a path a component library calls once per screen. It is worth it: the saving is one round trip, and what it was buying was a rare confident wrong answer about whether a component is safe to delete.
The test asserts the ORDER, not an outcome, because an outcome test cannot see this. A race that resolves correctly on almost every run would pass a "does health report a floor" assertion while the ordering was still wrong — the green would be evidence about scheduling rather than about the code. So the fixture records the sequence of reads and requires the marker probe to be last.
Break-verified by restoring the Promise.all, which fails that assertion while every other health case stays green.
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…out a walk Three findings, and two of them correct choices this branch made and defended. PROGRESS FROM ANOTHER GENERATION IS DISCARDED, not kept. The first version kept it so that moving the bounds back would not cost a re-walk, arguing that progress recorded under the bounds a host returned to is still true. It is not. A recorded scope is a claim about the INDEX, and the intervening generation mutated it — lowering `maxNodes` removes references beyond the new bound, so returning to the old one finds the old rows intact over an index those references are missing from, and reports an undercount as exact. Reusing them would only be sound if the index snapshot were restored with them, which nothing does. So a generation transition costs a re-walk in both directions, which is the price of the answer meaning anything. The read is unfiltered now, because a filtered one cannot see the rows it has to remove. A LISTED ROW WITH NO USABLE ID REFUSES rather than being skipped. Skipping reasoned that failing a scope over one malformed row was worse than losing the row — but losing it is silent and permanent: no rows are written for that document, no marker is left, the scope is recorded complete, and nothing later notices, because a document with no rows is indistinguishable from one that references nothing. It also stalls the walk, since the cursor advances to the last id SEEN and a page ending in an unreadable row leaves it where it was. Reachable rather than theoretical: a collection's own `afterRead` hook may strip fields from list results and `id` is not exempt. THE HEALTH READS ARE SEQUENTIAL, and the order is the point. A rebuild writes its markers and then records the scope. Read in parallel, the marker probe can land before a document is processed while the completion read lands after the row is written — and the two observations combine into "backfilled, nothing unreadable", the one answer that presents an incomplete index as exact. Reading completion first preserves the writer's ordering. Asserted on the ORDER rather than on an outcome, because an outcome test would pass on most runs with the ordering wrong. Row classification is its own function: deciding what a progress row means is a different job from paging a collection, and it carried every branch.
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Inline comments:
In `@packages/plugin-page-builder/src/class-usage-runtime.ts`:
- Around line 564-566: Update the stale-progress deletion handling in
completed() so genuine deletion errors are propagated before current-generation
backfill continues. Preserve concurrent-cleanup safety by ignoring only an
explicitly confirmed “already deleted” result, rather than swallowing every
failure in the catch block.
In `@packages/plugin-page-builder/src/plugin.ts`:
- Line 511: Update registeredCollectionSlugs to return undefined immediately
when a collection’s slug is an empty string, rather than silently excluding it
and returning the remaining slugs. Preserve normal collection handling for
non-empty slugs so backfillScopes refuses incomplete registry data.
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packages/plugin-page-builder/src/class-usage-runtime.tspackages/plugin-page-builder/src/collections/usage-backfill-state.tspackages/plugin-page-builder/src/index.tspackages/plugin-page-builder/src/plugin.tspackages/plugin-page-builder/src/usage-backfill-job.test.tspackages/plugin-page-builder/src/usage-backfill-job.tspackages/plugin-page-builder/src/usage-backfill-progress.test.tspackages/plugin-page-builder/src/usage-backfill-refusal.test.tspackages/plugin-page-builder/src/usage-backfill-scope.test.tspackages/plugin-page-builder/src/usage-backfill-scope.tspackages/plugin-page-builder/src/usage-backfill-wiring.test.tspackages/plugin-page-builder/src/usage-backfill-wiring.tspackages/plugin-page-builder/src/usage-backfill.test.tspackages/plugin-page-builder/src/usage-backfill.tspackages/plugin-page-builder/src/usage-health-service.tspackages/plugin-page-builder/src/usage-index-health.test.tspackages/plugin-page-builder/src/usage-index-health.tspackages/plugin-page-builder/src/usage-rebuild-paging.test.ts
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| const listed = await nextly.find({ | ||
| collection: args.collection, |
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When a tracked collection has a beforeOperation or beforeRead hook that narrows reads—supported even with overrideAccess: true, as demonstrated in packages/nextly/src/domains/collections/__tests__/read-hooks-narrow-query.integration.test.ts—this nextly.find enumerates only the hook-selected population. All returned rows can have valid IDs and hasNext: false, so the scope is recorded as complete while excluded pre-existing documents remain unindexed; health can then label an undercount exact and permit deleting a component those documents still use. Use an unhooked system enumeration or a hook context that reliably exempts this internal sweep. The paging tests currently use a fake find that cannot exercise this supported hook path, so add a positive control for it.
AGENTS.md reference: AGENTS.md:L218-L223
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| } catch { | ||
| // Retried on the next pass; see above. | ||
| } |
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If stale-row deletion keeps failing during a limits transition from generation A to B, swallowing the failure lets B finish while A's completion rows survive. After reverting to A, completed() accepts those old A keys even though the shared index was last rebuilt under B, so an undercount can again be presented as exact. Fresh evidence beyond the earlier generation-invalidation review is that this new invalidation path explicitly suppresses its own failure; propagate the failure or otherwise withhold completion until every stale row is gone.
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Already fixed, and it was real when you reported it — worth separating those two so the record is straight.
You reviewed 8ffae239b, and at that revision the code reads:
for (const id of stale) {
try {
await nextly.delete({ ... });
} catch {
// Retried on the next pass; see above.
So the swallow was exactly there, and your reasoning about why it is unsafe is the reasoning the repair was made on: a surviving stale row costs one repeat of the cleanup only if the cleanup runs again BEFORE the bounds return to that row's generation, and nothing guarantees that ordering.
f10d832b8 ("an input this cannot read is a refusal, not a gap") replaced it with a throw that names the row and carries the cause, and left the reasoning in the comment above the loop so the next person does not re-derive the cheap-looking version. That commit is a descendant of the one you read, which is why the current head no longer shows it.
Nothing further changed for this. Flagging it rather than silently resolving, because "already fixed" and "not a defect" are different answers and only one of them is true here.
| resolvedCollectionView, | ||
| } from "@nextlyhq/plugin-sdk"; | ||
| import type { PreviewViewportsDeclaration } from "nextly/config"; | ||
| import { requireNextly } from "nextly/runtime"; |
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nextly/runtime
When browser or Client Component code imports any public symbol from the package root, the emitted root module statically loads this dependency through plugin.ts. The package documents that root as isomorphic, but nextly/runtime explicitly aggregates Next.js request-lifecycle code and its emitted module imports Node built-ins and reaches the Direct API's browser guard, so importing an otherwise client-safe helper such as blocks or isBlocksField can now fail bundling or throw at runtime. Resolve requireNextly lazily inside the job's server-only execution path, or inject the required API without adding this runtime subpath to the root module graph.
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Confirmed and fixed in 47dce5857 — and the measurement turned up something that changes what "fixed" can honestly mean here, so both halves below.
The edge is mine and it is gone. main's plugin.ts has no module-scope nextly/runtime import; this branch added one, three lines below a comment explaining that a static JSON import was chosen precisely so this entry "adds no Node builtin to this entry — which is isomorphic and reachable from a browser bundle". src/index.ts exports pageBuilder from ./plugin, so it was in the graph of every root consumer.
It is resolved at call time now, inside the server-only job and health paths — the same remedy the preview-viewport reader in this same file already uses, for the reason its own comment gives: "a static import would pull the Direct API graph into every consumer of this plugin — including the browser bundle the canvas ships in". BackfillHost.nextly and the progress-store accessor return promises to carry it; all three call sites were already inside async functions.
Measured on the built entry rather than assumed. nextly/runtime's graph reaches async_hooks, crypto, fs, fs/promises, module, path, util and ws.
What I cannot claim is that the root is now isomorphic, because it is not. Two edges older than this branch:
library-route.tsimportsrequireNextlyfromnextly/runtimeat module scope, andplugin.tsimports./library-routeat module scope. Both onmaintoday.plugin.tsimports@nextlyhq/plugin-sdkat module scope, and that package's built root re-exports fromnextlyon its first line.nextly's own root graph — 157 chunks, 4.58 MB — reaches those eight plushttp,https,osandzlib.
So a browser consumer importing isBlocksField from the package root already had the framework in its module graph before this branch existed. Whether it FAILS depends on tree-shaking and sideEffects, which is presumably why nobody has hit it.
I have not tried to close those here. The second one is an SDK-level design question — whether the page-builder root is meant to be isomorphic at all, and if so what the SDK root may re-export — and it is not this pull request's to decide. Recorded as finding:page-builder-root-is-not-isomorphic with both edges, the measured built-in lists, and the two decisions it needs.
plugin-entry-graph.test.ts pins the one edge this branch added and removed, and says in its own header that it does not claim the root is isomorphic — a guard that overstated its scope would have to be suppressed the first time someone read it honestly.
It carries both controls, because an import guard that cannot see any import is the failure that looks exactly like compliance: one asserting the reader finds the imports plugin.ts does have, and one asserting it WOULD see nextly/runtime if it came back — taken from library-route.ts, which genuinely has it. Break-verified by putting the static import back, which fails the guard and leaves both controls green.
| for (let page = 1; ; page += 1) { | ||
| const listed: unknown = await ctx.services.collections.listCollections( | ||
| // Ordered so the pages partition the rows: an unordered paged read has no | ||
| // defined order between pages, so a slug can appear twice or not at all. | ||
| { page, limit: REGISTRY_PAGE_SIZE, sortBy: "slug", sortOrder: "asc" }, |
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On a site with more than 100 registry entries, deleting an entry from an already-read page while this loop is running shifts the later rows behind the next page offset. The next listCollections call can therefore skip a still-existing blocks collection, yet return a valid final page and cause completion to be evaluated against the shortened scope list; health may then report exact counts while that collection's old documents remain unindexed. The offset loop in singlesHoldBlocks has the same race and can miss the Single that should keep completeness false, so both registry walks need keyset/snapshot semantics or must refuse a population that changed during enumeration.
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Confirmed and fixed in 574002889, though not by keyset — that turned out not to be available.
Both walks page by position, and you are right that both fail the same way: registeredCollectionSlugs uses page/limit and singlesHoldBlocks uses offset/limit, so a row deleted behind the cursor shifts everything back and the row crossing the boundary is never read. I checked the consequence you name in each and they differ, which is worth recording: a missed collection gets no scopes while completion is judged against the shortened list; a missed Single flips "content this index cannot reach" to "none", which grants completeness over a homepage whose components then read as used by nothing.
Keyset is not reachable from here. listCollections accepts page, limit, search, sortBy, sortOrder, includeSchema and slugAllowlist — there is no cursor, and search is a substring filter rather than a range, so there is nothing to resume from.
I also checked the cheaper detector before falling back, because it would have been the better fix if it worked: comparing each page's first key against the previous page's last catches an INSERTION, which produces a duplicate — and not a deletion, which is the dangerous direction here. A deleted row makes the next page start one row late, and its first slug is still greater than the previous page's last, so the skip leaves no trace at the boundary.
So it is the second half of your "or": each walk captures the total the first page reported and refuses when a later page disagrees. undefined for the collection registry, which the enumeration already turns into a refusal that re-queues the sweep, and true for the Singles question, which is its existing fail-closed answer.
Named limit rather than implied: a delete and a create in the same window leave the count unchanged and pass. That is in the code beside the fence, because a fence that reads as complete is worse than one with a stated edge.
Both functions had to be exported to be tested at all — and that is the part I would flag if I were reviewing this. The collection enumeration is the one walk that decides whether the backfill ever sees a given collection, and nothing reached it, which is why a paging defect in it was invisible. Eight tests now, each refusal with a control beside it: a registry that holds still must still be read whole, or "refuse always" would satisfy every case and make the backfill unable to run anywhere.
| create: () => false, | ||
| update: () => false, | ||
| delete: () => false, |
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For a request made by a session super-admin, the collection access service bypasses code-defined access rules before evaluating these callbacks, while internal: true only hides the collection from admin navigation. Such a caller can therefore create a valid-looking (scopeKey, generation) row without walking the scope; the backfill then permanently skips it and health can advertise missing index data as exact. Unlike corruption of an index row, this is not repaired by the sweep because the forged progress row suppresses that sweep, so this state needs a boundary that external collection operations cannot cross rather than deny callbacks that privileged sessions bypass.
AGENTS.md reference: AGENTS.md:L312-L314
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Confirmed at the mechanism, and not closable from a plugin — filed as finding:backfill-progress-is-forgeable-by-a-super-admin.
Verified both halves rather than taking them together. The collection closes itself with code-defined callbacks — create, update, delete and read all return false — and collection-access-service.ts documents its own order in its module header: "the RBAC gate (super-admin bypass -> code-defined access -> DB permissions)". So for such a caller the callbacks are never evaluated, and internal: true only hides the collection from admin navigation, exactly as you say.
The part of your report I want to agree with explicitly is the asymmetry, because it is what makes this worth more than a shrug at a trusted role: a corrupted INDEX row is rewritten by the next sweep, and a forged PROGRESS row SUPPRESSES that sweep. So this is a durability problem rather than a privilege one — a super-admin can already delete the components outright, but they cannot already leave a permanent, silent hole that looks identical to work that was really done.
Two mitigations I considered and rejected as unsound rather than left untried:
- Cross-checking a completed scope against index rows it ought to have produced. A scope that legitimately references nothing has no rows either, so the check reports every such collection as forged.
- Not trusting the row and recomputing. That is the rescan the backfill exists to avoid.
What a plugin cannot do is declare a write boundary that the super-admin bypass does not cross — an access rule is the only closure available, and it is the one thing the bypass skips. That is the same core capability finding:cycle-guard-is-skippable-by-import needs from the other direction, which is worth noting because it argues for one boundary rather than two features.
One thing I did change, in 574002889: the collection's admin description claimed that editing it "cannot change what any page renders". That is true and misleading — it changes no render, and it changes what a usage count reports, which is what a delete is judged on. It now says so. A description that reassures a reader out of the one edit that matters is worse than none.
… a gap Two findings, both the shape every other one on this branch has had: something dropped quietly, so completeness is judged against a population smaller than the site. A FAILED DISCARD of stale progress was swallowed. The reasoning was that a surviving row costs one repeat of the cleanup on the next pass — true only if the cleanup runs again BEFORE the bounds return to that row's generation, and nothing orders those two events. A row that outlives the discard is then accepted as progress over an index the intervening generation changed, which is precisely what the discard exists to prevent. It propagates now; the sweep is re-queued and the queue is durable, so refusing costs a tick. A COLLECTION WITH AN UNREADABLE SLUG was skipped and the rest returned. Its scopes are then never created, and completeness is judged against a list missing it — so the index reports itself whole while that collection's content is unindexed. It refuses now, like every other unreadable input in this enumeration: a short list here is indistinguishable from a small site.
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| const pass = await advanceBackfill({ | ||
| scopes, | ||
| state, | ||
| rebuild: deps.rebuild, | ||
| }); |
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When rebuilding one scope takes longer than the remaining job budget—for example, a large collection or slow read hooks—this awaits the entire collection walk even after the deadline passes. The runner explicitly cannot interrupt a running handler (packages/nextly/src/domains/jobs/run-jobs.ts), and progress is recorded only after the full scope finishes, so a serverless timeout kills the attempt and every later sweep restarts the same scope from page one. Such installations may never finish backfilling and repeatedly impose the full scan on the shared job queue; persist a per-page cursor or otherwise split a scope into resumable units.
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Confirmed, and NOT fixed here — filed as finding:backfill-cannot-resume-inside-one-scope with the design, because the fix is a protocol rather than a patch.
Your reading of the control flow is right, and I checked the half that limits it: the job DOES check the deadline before each scope and return when it has passed, so a site whose scopes each fit in one budget makes steady progress. What it cannot do is stop part way through one scope — advanceBackfill awaits the whole rebuild(scope) and records only after it resolves, and the runner cannot interrupt a running handler. So one oversized scope is restarted from its first page on every sweep, for ever, and re-imposes the full scan on a shared queue.
Worth separating from the other findings on this pull request: this is LIVENESS, not correctness. Nothing is indexed wrongly, the scope stays outstanding, health keeps reporting incomplete and the counts stay floors. The answers stay honest; they just never improve. That is why I have not taken it ahead of the generation and completeness defects.
What closes it is smaller than it looks, because the cursor already exists. The rebuild pages by keyset — resuming after the last id seen is what makes it safe against documents deleted mid-walk — and that cursor is currently per pass and discarded. Persisting it means: carry a cursor on the progress collection beside the completed key, have the rebuild accept a start and report where it stopped and whether it finished, and have the pass record a partial cursor or a completed key accordingly. It also needs the deadline pushed down into the walk, since the point is to stop between PAGES; today only the caller consults it.
Two things that have to be decided with it rather than after: a persisted cursor must not survive a generation change, since the pages behind it were read under different bounds; and whether a partial cursor is visible to health, which should read as incomplete either way.
I would rather that landed as its own change with its own tests than as a fourth mechanism bolted onto this one.
| // not part of the type, so a refactor that reorders the interface would | ||
| // silently invalidate every site's progress. Naming each bound means a change | ||
| // to what the generation covers has to be written here. | ||
| return [limits.maxDepth, limits.maxNodes, limits.maxBytes].join("x"); |
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When an existing installation changes the plugin's supported .rename() mapping for either usage-index collection but leaves the progress collection unchanged, core registers the new slug as a new code-first collection while retaining the old one as an orphan. This generation remains identical because it includes only traversal limits, so the old completed-scope rows are accepted for the new, initially empty index and health can report its zero counts as exact, allowing deletion of components still used by pre-existing documents. Include the resolved class and component index identities in the generation, or otherwise clear progress whenever either target is remapped.
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Confirmed and fixed in 47dce5857. This one I had to go and check rather than reason about, because it turns on whether renaming an index is actually supported — and it is, first-class: plugin.ts resolves ctx.self.collections[CLASS_USAGE_INDEX_SLUG] ?? CLASS_USAGE_INDEX_SLUG and the same for the component index, with a comment saying a hook holding the literal "would write every row to a table that does not exist".
So your chain holds end to end: the new slug is a new, empty code-first collection, the old one stays as an orphan, the generation covers only the three traversal bounds, and the completed-scope rows are accepted against an index that has never been written to. Health then reports its zero counts as exact, which is the one answer a safe delete must never be handed.
Both resolved slugs are in the generation now, not just the one being read — a scope's walk writes to each, so a scope recorded before EITHER was remapped is not finished work after it.
One thing I found while implementing that your report did not name, and that would have made the fix unsound: the parts were joined on "x". That was fine while they were three numbers, and it is not fine with slugs beside them, because a slug matches /^[a-z][a-z0-9_-]*$/ and so may contain an x. classIndex: "ax", componentIndex: "b" and classIndex: "a", componentIndex: "xb" both serialise to …xaxxb — two different derivations, one generation string, and a fence that cannot tell them apart fails in the direction that accepts stale progress. Joined on | now, which a slug cannot contain.
That is also the test I nearly got wrong. My first version of "cannot be forged by a slug" picked two unequal slugs that do not actually collide under x, so it passed with the x join still in place. The mutant surviving is what exposed it; the test now uses the exact colliding pair above.
Tests: "changes when either index collection is remapped", "cannot be forged by a slug that looks like another derivation", and the existing "is the same for the same derivation" control. Break-verified with two mutants — dropping the slugs from the generation kills the first two, and restoring the x join kills the collision case.
No migration concern: the backfill's own changeset is in this pull request, so nothing has shipped under the old spelling and no installation has progress to invalidate.
| const fields = blocksFieldsOf(collection); | ||
| // Asked BEFORE the field check would be wasteful, and asked at all only | ||
| // for collections that actually carry a blocks field: the draft split is a | ||
| // read, and a site's other collections are the majority. | ||
| if (fields.length === 0) continue; |
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When a collection stores a blocks field beneath a named group, blocksFieldsOf intentionally returns no descriptor for it (the repository's own class-usage-blocks-fields.test.ts pins that behavior), even though named groups support nested field configurations and persist the block document under the group key. This branch therefore treats a collection containing only such fields as having nothing to index; unlike Singles, no unreachable check covers it, so completion can become true while neither the write hook nor the backfill has indexed those component references. Detect these unaddressable declarations and keep health incomplete, or add path-aware maintenance and rebuilding before allowing exact counts.
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Confirmed and fixed in 47dce5857.
Verified both halves before changing anything. blocksFieldsOf skips a named group because presentationalChildren returns null for it, so the walk never descends — and class-usage-blocks-fields.test.ts pins that by name. The enumeration then does if (fields.length === 0) continue;, so a collection whose only blocks field is nested contributes no scope at all, and "every scope walked" is vacuously true over a set that never included it.
You are also right that nothing else catches it: the unreachable check exists but answers only singlesHoldBlocks().
I kept the exclusion, which I think is the right half of your "or". Indexing a nested field would file rows no rebuild can reconcile and no sweep can clear — the permanently stranded state — so path-aware maintenance is a real piece of work rather than a flag. What changed is that the exclusion is no longer SILENT: it is reported through the unreachable seam, whose own docblock already states the rule this was breaking — "a backfill that finished every scope it CAN see must still not claim the index covers the site".
Two implementation notes, both about not writing a second walk:
blocksFieldSurveyreturns the addressable descriptors AND whether anything unaddressable was seen, from ONE traversal, withblocksFieldsOfderived from it. LikewisebackfillSurveyreturns the scopes and the flag from one registry walk, withbackfillScopesderived from it — so a health render does not walk the registry twice and the two answers cannot come from different moments.- Containers are recognised structurally, by carrying a
fieldsarray this does not descend into for addressing, rather than by listing type names. A repeater is covered by that without being named, and so is whatever container this package meets next.
The case worth calling out is the one a "does this collection have any scopes" check cannot see: a collection with an addressable field BESIDE a nested one gets its scope, walks it to completion, and the nested field is still never indexed. It has its own test.
Break-verified with three mutants: never noticing a nested field, treating a nested container's children as addressable (which also kills the two pre-existing tests that pin the deliberate exclusion), and reporting every group as unaddressable (which kills the control and seven existing cases).
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| // Another generation's progress, which cannot be reused and must not be | ||
| // left to be reused later. Collected rather than deleted here, so the | ||
| // paging is not walking a collection it is mutating. | ||
| if (typeof row.id === "string") stale.push(row.id); |
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When a supported afterRead hook strips id from the progress collection during a limits transition from generation A to B, this branch neither deletes nor rejects the stale A row. If the limits later return to A, completed() accepts that surviving row's scopeKey and generation even though B rebuilt the shared indexes, so an undercount can be reported as exact and permit an unsafe deletion. Fresh evidence beyond the earlier unreadable-list-row finding is that this progress-row classifier still explicitly skips the same malformed identifier; refuse the read instead of leaving the stale completion claim in place.
AGENTS.md reference: AGENTS.md:L292-L296
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Already fixed at 4099d5fb0, which postdates the revision you read (2d273877d).
staleRowId now refuses instead of skipping:
function staleRowId(row: { id?: unknown }): string {
if (typeof row.id === "string" && row.id.length > 0) return row.id;
throw new Error(
"[page-builder] the usage backfill found a progress row from another derivation with no readable id, so it cannot be discarded and would survive to be reused"
);
}
Your chain is what the docblock above it now records: a stale row that cannot be addressed cannot be deleted, so it outlives the discard, and the next time a host's bounds return to its generation it reads as completed progress over an index another generation has since rebuilt.
Note this is the half that does NOT depend on the hook question. Refusing an unreadable row is right whether or not a plugin can ever read its own system collections without hooks — the read having been transformed is one way the id goes missing, and an adapter answering oddly is another. The remaining hook-bypass half is on the threads about trusting transformed keys, and is blocked on a founder decision.
| // remember, so the day a backfill lands there is one place that learns to | ||
| // ask it. | ||
| coversExistingDocuments: false, | ||
| coversExistingDocuments: covers, |
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When two tracked collections contain documents with the same id—for example after importing or restoring records—the count path groups matching rows only by entityKey, so references from those distinct documents collapse into one bucket. Previously health always kept such counts marked as floors; assigning the completed backfill result here now allows the undercount to be presented as exact. Include the collection/scope in the grouped document identity, or keep completeness false until the count can distinguish those documents.
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Already fixed at 4099d5fb0, which postdates the revision you read.
The count path no longer groups by entityKey alone. It groups by collection first and then by document within each collection:
// Which collections hold a reference at all, then the documents in EACH.
// ... grouping by the id across every collection at once is the fold described
// above, and grouping by collection alone counts collections, not documents.
Your premise is the one the fix is written on, and it is now stated at the top of usage-count.ts: entityKey holds the document's id and entity the collection it lives in, ids are minted per collection, so two tracked collections can each hold a document with the same id — which restored and imported records do.
The truncation flag travels through both levels, so a read that reached its cap at either level still reports the count as a floor rather than as exact.
…must be addressable Two ways the usage count could read below the truth while the index said it was exact — which is the one answer a safe delete must never be handed. A document is identified by the PAIR of collection and id, not the id alone: ids are minted per collection, so two tracked collections can each hold a document with the same id, and restored or imported records do. The count grouped by the id across every collection at once, folding those into one bucket. That was harmless while health always marked such counts as floors; with the backfill able to declare the index whole, the fold presents itself as exact. The grouped read takes one column, so the pair is now asked as two questions — which collections hold a reference, then the documents within each — and summed. The reader hands back bucket KEYS rather than a count so the first question can be asked at all, and a row naming no collection makes the answer a floor, since that document cannot be placed. And a progress row from another generation whose `id` is not a string — an `afterRead` hook can strip it — was skipped rather than refused. A stale row that cannot be addressed cannot be deleted, so it outlives the discard, and the next time a host's bounds return to its generation it is read as completed progress over an index another generation rebuilt. The delete-failure path already refuses for exactly this reason; an unaddressable row is the same outcome one step earlier, and now refuses the same way. The count's fake reader folds ids across collections the way a real database does, so the collision case fails on the NUMBER under the old grouping rather than on the fake declining an unfamiliar query.
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Both reproduced and fixed in 4099d5f. P1 — stale row without a readable id. Confirmed: it was skipped where the delete-failure path one step later already refuses for the identical reason. An unaddressable stale row outlives the discard and is read as completed progress the next time the bounds return to its generation. It now refuses with the same shape of error. Break-verified: skipping it again kills the new case. P2 — grouping by id alone across collections. Confirmed, and worse than the earlier finding implied: this only became a live undercount once the backfill could declare the index whole. This branch was also merged onto main past #1761, so its integration legs run against the repaired golden test. |
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| return readUsageIndexHealth({ | ||
| index, | ||
| read: usageCountReader(nextly, indexCollection), |
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When a collection-specific or * beforeRead/beforeOperation hook narrows the internal usage-index collection, core applies the hook-settled predicate even with overrideAccess: true (packages/nextly/src/domains/collections/services/collection-query-service.ts, lines 1187-1191). This service can now report coversExistingDocuments: true, but both the marker probe and component counts use usageCountReader's hooked nextly.group, so hidden marker or reference rows produce anyUndetermined: false and a complete: true undercount. The existing enumeration finding covers the source-document find; this aggregate path remains hooked and needs an unhooked internal read context too.
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| function staleRowId(row: { id?: unknown }): string { | ||
| if (typeof row.id === "string" && row.id.length > 0) return row.id; | ||
| throw new Error( |
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When a supported afterRead hook rewrites a stale progress row's id to another valid progress-row ID, this helper accepts the transformed value and cleanup deletes the other row while leaving the stale row intact. If the limits later return to the stale row's generation, completed() accepts its old scopeKey against indexes rebuilt under the intervening generation, allowing an undercount to be presented as exact. Fresh evidence beyond the prior missing-ID finding is that the new helper checks only for a nonempty string; use a hook-bypassing read or another immutable identity rather than trusting the transformed ID.
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Three findings on this PR share one root cause, and the earliest of them — the P1 "Bypass read hooks while enumerating backfill documents" from yesterday — went unanswered, which I should have caught. Answering all three together. The root cause is real and is not fixable inside this package. So a site with a narrowing wildcard hook — tenant scoping is the ordinary case — can narrow the plugin's reads of its own bookkeeping tables: the backfill records a scope complete over a partial population, the marker probe and counts under-report, and Filed as Until one lands, the honest statement of this PR is: the count is exact on sites with no narrowing read hooks. I'd rather say that on the PR than fake a fix here. Not marking any of the three resolved. |
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| // outstanding, which costs a repeat walk and is the safe direction — | ||
| // treating it as a completed scope of unknown identity is what would leave | ||
| // a real scope permanently unwalked. | ||
| if (typeof key === "string" && key.length > 0) keys.add(key); |
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When a code-registered or stored afterRead hook rewrites a progress row's generation and scopeKey to the current generation and an outstanding scope, this line accepts that transformed key as completed even though no rebuild produced it. The sweep then skips that scope, and health can present its missing references as exact, permitting an unsafe component deletion. Distinct from the earlier stale-row-ID issue, the fresh evidence here is that current-generation coordinates are trusted directly; read this internal state through a hook-bypassing boundary or verify it against immutable storage.
AGENTS.md reference: AGENTS.md:L308-L308
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| runner's deadline, and defers the rest to a durable queue. A scope is recorded | ||
| only after its walk resolves AND reports nothing unrepaired or undetermined, so | ||
| a partial rebuild is retried rather than marked done and never revisited. |
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After the deterministic-retry bug was fixed, the final refuseIncompleteWalk deliberately allows an undetermined-only report to be recorded because its unreadable marker keeps health incomplete. These release notes still claim the opposite—that any undetermined result leaves the scope outstanding and retried—so the published changelog will give operators an incorrect model of whether oversized documents are rescanned or await a later save or limits change.
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Confirmed and fixed in 47dce5857. You are right, and it is worth saying plainly that the code is correct and the prose was wrong — the release note described a stricter rule than the one that ships.
refuseIncompleteWalk refuses on report.failure or report.unrepaired and says nothing about undetermined, and usage-backfill-refusal.test.ts pins that by name: "RECORDS a scope whose documents could not be read whole". The reasoning is in the docblock — exceeding a bound is deterministic, the same document exceeds it on every pass, so refusing would leave the scope outstanding for ever and make every drain rescan the collection.
So an operator reading the published changelog would have expected an oversized document to be rescanned on the next sweep. The note now says what actually happens: the document leaves an unreadable marker, written before the scope is recorded, and that marker is what stops health calling any count exact until a later save or a change of traversal limits makes the document readable again.
Also regenerated the frontmatter from the fixed group in .changeset/config.json while I was in the file — the group gained @nextlyhq/plugin-mcp while this branch was open, so the changeset named 25 of 26 and the release gate refused it. Caught by the pre-commit hook rather than by me.
| await args.rebuild(outstanding); | ||
| await args.state.record(backfillScopeKey(outstanding)); |
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When a rolling deployment changes the traversal limits and an old generation-A sweep loses its lease but later resumes while generation B is running, core's documented at-least-once runner can execute both handlers concurrently. These separate rebuild and record operations have no generation fence, so A can overwrite the shared indexes after B rebuilt them while B's completion rows remain; the next B health read deletes A's progress, accepts B as complete, and reports A-derived counts as exact. Fresh evidence beyond the earlier sequential generation-invalidation issue is the concurrent stale-handler path; serialize or fence index writes by generation so an obsolete attempt cannot mutate the snapshot certified by newer progress.
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Confirmed at the mechanism, and NOT fixed here — because every fence I can fit in this pull request is unsound in a way that would read as complete, and I would rather leave a documented gap than a mechanism that looks like a fence.
Your premise is the runner's own, stated in its module header:
Neither stops a handler that OUTLIVES its lease: while it is still running, the lease expires, another pass reclaims the row, and the same handler runs again concurrently. The fence then refuses the first runner's write — but it cannot undo anything that runner already did outside the database. So: handlers must be idempotent.
The backfill handler is idempotent WITHIN a generation — same bounds, same rows — and is not across one, which is precisely the case you describe. rebuild then record with no derivation fence, so a resumed generation-A attempt rewrites rows generation B already produced, B's completion survives, and health reports A-derived counts as exact.
Three cheap fences, and why I rejected each:
- Refuse to record when the generation moved. Does not help: the damage is the index WRITE, not the progress row. B's completion still stands and nothing re-walks the scope.
- Check the generation before writing. Time-of-check-to-time-of-use. Narrows the window, cannot close it, and a narrowed race is the kind that stops being reproduced and starts being assumed absent.
- Have the stale handler delete the CURRENT generation's progress row for that scope, forcing a re-walk. This one genuinely self-heals — and only if the stale handler survives to notice. A crash between its write and its check leaves exactly the state you describe, now behind a mechanism that reads as a fence. That is worse than the gap.
What closes it is stamping the derivation on the index rows so a stale writer's rows are INVISIBLE rather than merely later: a generation column on both index collections, every writer stamping it, every reader filtering on it, and reconcile and sweep comparing within a generation. That is a schema change on two collections plus the writer, the count, the marker probe and the health path — comparable in size to the backfill itself.
It also carries a decision rather than just work. With generation-scoped rows, a limits change makes every existing row stale at once, so counts read zero-and-not-exact during the transition rather than stale-and-not-exact. Both are honest, they are different things for an operator watching a usage count, and which one is wanted is not mine to pick.
Filed as finding:usage-index-writes-are-not-fenced-by-generation with the mechanism, the three rejected fences and the design, so it is a decision someone takes rather than something this pull request quietly half-did.
Worth bounding the exposure plainly: it needs a rolling deployment that CHANGES pageBuilder({ limits }), and a handler that outlives its lease across that change. A steady-limits site — which is every site not mid-retune — cannot reach it, because within one generation the rebuild is idempotent and a concurrent duplicate writes the same rows.
…tion The generation beside a progress key said what the documents were read AS and not where the result was PUT. A host may `.rename()` either usage index; core then registers the new slug as a new code-first collection and keeps the old one as an orphan, so the rows the progress certifies sit in a table nothing reads and the new index is empty. With the traversal bounds unchanged the generation was unchanged too, the completed-scope rows were accepted against that empty index, and health reported its zero counts as EXACT — which is the one answer that licenses deleting a component every existing document still renders. Both resolved slugs are part of the generation now, because a scope's walk writes to both. The parts are joined on `|` rather than the `x` this used while it held only numbers. A slug matches /^[a-z][a-z0-9_-]*$/ and so may contain an `x`, which lets two different derivations serialise to one string: `ax` + `b` and `a` + `xb` are the same under `x`. A fence that cannot tell two derivations apart fails in the direction that accepts stale progress. Nothing has shipped under the old spelling — the backfill's changeset is in this same pull request — so no installation has progress to invalidate.
…mpleteness A blocks field nested under a named group has no addressable subject, so `blocksFieldsOf` returns no descriptor for it. That is deliberate and stays: indexing it would file rows no rebuild can reconcile and no sweep can clear. What was wrong is that it was excluded SILENTLY. The scope enumeration skips a collection whose field list comes back empty, so a collection whose only blocks field is nested contributed no scope at all — and "every scope walked" is vacuously true over a set that never included it. Health then reported an index that had never seen those references as exact. A collection with an addressable field BESIDE a nested one is the worse shape: it walks its own scope to completion and the nested field is still never indexed. Reported now through the `unreachable` seam Singles already use, whose own docblock states the rule — a backfill that finished every scope it CAN see must still not claim the index covers the site. Both answers come from ONE traversal (`blocksFieldSurvey`, with `blocksFieldsOf` derived from it) and ONE registry walk (`backfillSurvey`, with `backfillScopes` derived from it). Two walks over one configuration agree on the day they are written, and the one that drifts here fails by staying silent. Containers are recognised structurally — any field carrying a `fields` array this does not descend into for addressing — rather than by listing type names, so a repeater or a container this package has not met yet is noticed too.
…pass runs
`plugin.ts` gained a module-scope `import { requireNextly } from "nextly/runtime"`
on this branch, three lines below a comment explaining that this entry is
isomorphic and reachable from a browser bundle.
`src/index.ts` exports `pageBuilder` from `./plugin`, so that import is in the
module graph of every consumer that imports so much as `isBlocksField` from the
package root. Measured on the built entry, `nextly/runtime` reaches
`async_hooks`, `crypto`, `fs`, `fs/promises`, `module`, `path`, `util` and `ws`.
Resolved at call time now, inside the server-only job and health paths — the
same remedy the preview-viewport reader in this file already uses, for the
reason its own comment gives. `BackfillHost.nextly` and the progress store
accessor return promises to carry it; every one of the three call sites was
already inside an async function.
`plugin-entry-graph.test.ts` pins the edge, with both controls: that the reader
finds the imports this file does have, and that it WOULD see the banned
specifier if it came back.
It pins that one edge only, and says so. The root is not isomorphic today for
two older reasons that are not this file's to fix — `library-route.ts` imports
`nextly/runtime` at module scope, and `@nextlyhq/plugin-sdk` re-exports from
`nextly`, whose root graph reaches twelve Node built-ins. Recorded as
`finding:page-builder-root-is-not-isomorphic` with what each would take.
The note claimed a scope is recorded only after its walk reports nothing unrepaired OR UNDETERMINED. `refuseIncompleteWalk` deliberately allows an undetermined-only report through, and a test pins it by name — exceeding a bound is deterministic, so refusing would leave the scope outstanding for ever and make every drain rescan the collection. Operators would have read the published changelog and expected an oversized document to be rescanned on the next sweep. What actually happens is that it leaves an `unreadable` marker, written before the scope is recorded, and that marker is what stops health calling any count exact until a later save or a change of traversal limits makes the document readable again. The frontmatter is regenerated from the `fixed` group in `.changeset/config.json` as well: the group gained `@nextlyhq/plugin-mcp` while this branch was open, and a changeset naming 25 of the 26 is refused by the release gate.
…can be The survey walk grew two branches and with them the reason a reader has to hold the traversal and the classification in their head at once. `stepFor` answers which of the three a declaration is — descend keeping this frame's addressability, descend into a container whose children cannot be enumerated, or a blocks field — and `walkDeclarations` is then about the cursor stack, the cycle set and the two accumulators. The shape guards stay with the exported entry point. No behaviour moves: the same three mutants die on the same tests as before.
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| if (!Array.isArray(rows) || typeof total !== "number") return true; | ||
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| for (const row of rows) { | ||
| if (blocksFieldsOf(row as { fields?: unknown }).length > 0) return true; |
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When a Single declares a blocks field beneath a named group or repeater, blocksFieldsOf deliberately returns an empty addressable list, so this check treats that Single as containing no blocks. The collection-side survey now marks the same nested declaration unaddressable, but this Single path still allows all collection scopes to complete and health to report exact zero usage even though Singles are never indexed. Use blocksFieldSurvey here and withhold completeness when either addressable or unaddressable blocks fields are present.
AGENTS.md reference: AGENTS.md:L299-L302
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Confirmed and fixed. You caught a fix of mine that reached one of its two call sites — the collection survey learned to report an unaddressable declaration and the Single question kept reading the addressable half, so the two now disagreed about the same declaration. That is worse than the original gap, because the collection side reading correctly makes the whole answer look considered.
singlesHoldBlocks asks blocksFieldSurvey now and withholds completeness when EITHER half is non-empty.
While verifying it I found the same loop had a second fault, in the opposite direction, which your neighbouring thread names — orphaned source: "code" rows. Both are fixed in the same commit, and the pair is worth noting: one made completeness too easy and the other made it unreachable. A loop that is wrong in both directions is usually one that was never asked what population it is judging.
Tests: "withholds completeness for a Single whose blocks field is NESTED" and one for a field-group reference, with the existing "answers false for a steady registry holding no blocks" as the control — without it, returning true unconditionally would satisfy both. Break-verified by restoring the addressable-only read, which kills both.
| function nestedDeclarations(value: unknown): readonly unknown[] | null { | ||
| if (typeof value !== "object" || value === null) return null; | ||
| const field = value as { fields?: unknown }; | ||
| return Array.isArray(field.fields) ? field.fields : null; |
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When a collection or Single embeds a reusable fieldGroup whose separate definition contains a blocks() field, the host declaration contains only the field-group reference and no inline fields array. nestedDeclarations therefore returns null, and the survey reports neither a scope nor unaddressable; maintenance skips the content too, allowing health to label its missing component references exact. Resolve referenced field-group definitions during the survey, or conservatively treat unresolved component/field-group references as unreachable.
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Confirmed and fixed. You are right that my "structural rather than by type name" claim did not reach this: a reference has no inline fields array to be structural ABOUT.
isFieldGroupFieldType from nextly/field-group-type is the predicate, so the two type names are not restated here. I checked what that subpath costs before importing it, because I had just spent a commit keeping nextly/runtime out of this package's root graph: 424 bytes, two chunks totalling 3.3 KB, no Node built-ins.
I took the conservative half of your "or", because resolving is not available — the plugin context publishes collections, singles, users, media, email, versions and jobs, and no field-group registry. So an unresolved reference is treated as possibly holding blocks.
The cost is worth stating rather than burying, because it is permanent: a site using ANY field group never reports an exact count, so a delete stays conservative for ever even when the referenced group holds no blocks field at all. I took that over the alternative, which permits deleting a component the referenced group still renders — the one outcome the index exists to prevent. If the registry ever reaches a plugin, this becomes a resolution rather than an assumption.
One deliberate exception to my own rule, stated in the code: this enumerates rather than asks a structural question. Nothing distinguishes a reference from an ordinary scalar field without knowing the vocabulary, and treating every unrecognised type as unresolvable would mark a text field unreachable and withhold completeness from every site.
Tests cover both reference types and carry the control that an ordinary field is NOT mistaken for one. Break-verified by making the reference invisible again, which kills three across two files.
| if (!Array.isArray(rows) || typeof total !== "number") return true; | ||
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| for (const row of rows) { | ||
| if (blocksFieldsOf(row as { fields?: unknown }).length > 0) return true; |
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When a code-first Single containing blocks is removed from configuration, its registry row remains readable until destructive cleanup, as documented by the PluginSinglesService contract. This loop treats that orphan as a currently declared Single and returns true, so unreachable remains true and usage counts can never become exact even though the Single no longer exists in the application. Filter orphaned code-source rows against the live Single configuration before deciding that Singles withhold completeness.
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Confirmed and fixed, using exactly the route the contract points at.
PluginSinglesService.list documents this precisely: a removed code-first Single's registry row stays readable until the destructive cleanup, it is returned carrying source: "code", it is deliberately NOT filtered at that layer — because filtering after listSingles has applied limit and offset returns a short page and a total describing one page rather than the result — and "a caller that must exclude them can: source is on every record, and a plugin holds ctx.config.singles."
So the filter is here, before the survey: a row whose source is code and whose slug configuration no longer declares is a leftover, not a Single.
Two cases deliberately keep the row counted, because the whole point of this question is to withhold completeness when something might be out of reach:
- A configuration this cannot enumerate. An unreadable config is not an empty one — read as declaring nothing, every row becomes an orphan and completeness is granted over the entire site. That is the failure this filter could easily have introduced.
- A row with no readable slug, which cannot be matched against anything.
And a BUILDER-made Single is never an orphan: its registry row IS the declaration, so configuration saying nothing about it is not evidence that it was removed. That one has its own test, because a filter keyed on "not in config" rather than on source === "code" would quietly hide every Builder-made Single.
Break-verified three ways — counting orphans again, treating an unreadable config as empty, and treating a builder row as an orphan — each killing exactly the case named for it.
…efused Both registry walks page by POSITION, because neither service offers a cursor: `page`/`limit` for collections, `offset`/`limit` for Singles. So deleting a row the walk has already passed shifts everything behind it back, the next page starts one row late, and the row that crosses the boundary is never read. Both misses are silent and both GRANT completeness. A missed collection gets no scopes while completion is judged against the shortened list. A missed Single flips "content this index cannot reach" to "none", which is the answer that lets a homepage's components read as used by nothing. Either ends with health calling an index that never saw those documents exact. Each walk now captures the total the first page reported and refuses when a later page disagrees — `undefined` for the collection registry, which the enumeration already treats as a refusal that re-queues the sweep, and `true` for the Singles question, which is its existing fail-closed answer. What this does NOT catch is a delete and a create in the same window, which leaves the count unchanged. Stated in the code rather than implied, because a fence that reads as complete is worse than one with a named edge. Both functions were exported to be tested at all. The collection enumeration had no test reaching it, which is why a paging defect in the one walk that decides whether the backfill sees every collection went unnoticed.
…ere costs Its admin description said editing it "cannot change what any page renders". True, and misleading: a row added here marks a scope as already walked, so its documents stay out of the index and every usage count for them reads as zero — which is what a delete is judged on. A description that reassures a reader out of the one edit that matters is worse than none. The access block now also records that its callbacks do not stop a session super-admin. The RBAC gate is ordered "super-admin bypass -> code-defined access -> DB permissions", so for such a caller they are never evaluated, and `internal: true` only hides the collection from navigation. Closing that needs a write boundary external collection operations cannot cross, which is a core capability rather than an access rule a plugin can declare. What makes it worth naming rather than shrugging at a trusted role is that it does not self-repair: a corrupted index row is rewritten by the next sweep, and a forged progress row suppresses that sweep. Recorded as `finding:backfill-progress-is-forgeable-by-a-super-admin`.
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| return [ | ||
| limits.maxDepth, | ||
| limits.maxNodes, | ||
| limits.maxBytes, | ||
| classIndex, | ||
| componentIndex, | ||
| ].join("|"); |
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When an installation upgrades to a release that changes classUsageOf or componentUsageOf semantics without changing its limits or resolved index slugs, this produces the same generation and reuses every completed-scope row. The indexes therefore retain results derived by the old code while health can advertise them as exact; for example, a fix that discovers a previously missed component would leave that component at an exact zero until each document is saved. Include an explicit derivation/schema revision in this key and increment it whenever index semantics change.
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Confirmed and fixed. This completes the generation key from the other direction to the one I fixed an hour ago, and the pair is the point: the bounds say what the documents were read AS, the index slugs say where the result was PUT, and neither moves when a release changes what the walk EXTRACTS.
DERIVATION_REVISION is in the key now. The rule for changing it is written beside it rather than left to judgement, because a revision nobody bumps is worse than none — it reads as covered:
Bump this whenever what a walk extracts from a document changes. Not when the walk gets faster, not when a bound moves (the bounds are in the key already), and not when this file is edited — only when the same document under the same bounds would now yield different rows.
Your example is the one that decided it for me: a fix that starts finding a reference the old code missed leaves every already-walked scope recorded, so the component it now finds sits at an EXACT zero until each document happens to be saved. An exact zero over rows the current code would not produce is the one answer a safe delete must never be handed, and nothing about it looks wrong from outside.
No migration concern: the backfill's own changeset is in this pull request, so nothing has shipped under any spelling of this key.
Worth naming what it still does not cover, since a revision is a manual instrument: it fences a release that KNOWS it changed the derivation. A change that alters extraction without anyone noticing is not caught by a number someone has to remember to bump — that is the same class as the generation-fencing finding, and closing it properly means the rows themselves carrying the revision they were written under.
| const pass = await advanceBackfill({ | ||
| scopes, | ||
| state, | ||
| rebuild: deps.rebuild, | ||
| }); |
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On installations with many scopes, every iteration of this loop calls advanceBackfill, which calls state.completed() again; the production store implements that operation by paging through the entire progress collection. Consequently, processing N empty or small scopes performs O(N²) progress-row reads and can consume repeated job drains mostly rescanning rows already read during the same handler invocation. Read the completed set once per handler and update it locally after each successful record, or otherwise avoid a full progress scan for every scope.
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Confirmed and fixed. The quadratic is real and your reading of the cause is exact: advanceBackfill read state.completed() on every call, the handler calls it once per scope, and the production store answers it by paging the whole progress collection.
The handler reads it once and threads it through every pass; each pass hands back the set including what it just recorded. Reading from the store remains the default for a caller making a single pass, so nothing else changes.
The reasoning was already half-written in that function and I had not followed it through. It recomputes the post-pass set locally rather than re-reading, with a comment saying re-reading "would be a second round trip to learn something already known, and would also fold in whatever another instance recorded meanwhile — which is not wrong, but makes the answer depend on timing rather than on this pass". That argument applies to the read at the TOP of the pass just as much, and threading makes the whole handler consistent about it rather than only its tail.
One thing I changed in the test fixture rather than only in the code: the store now counts its reads. A test asserting only the outcome passes whether or not the set was threaded — "did this read the store at all" is the property, and it needs an instrument. The threading test asserts reads: 0.
There is a second test for the half that would silently undo it: a pass must hand back the set INCLUDING what it just recorded. Threading a stale set makes the next pass pick the same scope and walk it twice, which is this cost paid twice rather than avoided.
Break-verified by restoring the unconditional store read, which kills the threading test and leaves the rest green.
…ocks field A `fieldGroup` or `component` field carries only the slug it points at — the definition lives elsewhere, so there is no inline `fields` array to descend into and the survey reported neither a scope nor unreachable content. A blocks field inside that definition is then invisible to the scopes AND to the completeness flag, which is exactly the vacuous "every scope walked" this survey was added to stop. Resolving it is not available: the plugin context publishes collections, singles, users, media, email, versions and jobs, and no field-group registry. So an unresolved reference is treated as possibly holding blocks. That is the fail-closed direction and the cost is real: a site using any field group never reports an exact count, so a delete stays conservative for ever. The other direction permits deleting a component the referenced group still renders, which is the outcome the index exists to prevent. Recognised through `isFieldGroupFieldType` from `nextly/field-group-type` rather than a second list of the two type names — 3.3 KB, no Node built-ins, so it does not undo the root-entry work. Enumerated rather than structural here on purpose: nothing distinguishes a reference from an ordinary scalar without knowing the vocabulary, and treating every unrecognised type as unresolvable would mark a text field unreachable.
…s collections Two faults in one loop, opposite in direction. It read only `blocksFieldsOf` — the ADDRESSABLE half. A Single declaring its blocks field under a named group, or behind a field-group reference, returns an empty addressable list, so this answered "no blocks here" for content no scope will ever index. Every collection scope could then complete and health report an exact zero. The collection side was taught to ask the full survey in the previous commit; asking differently here is how the two come to disagree about one declaration. And it counted ORPHANS. Removing a code-first Single from config leaves its registry row readable until the destructive cleanup runs, carrying `source: "code"` — `PluginSinglesService.list` documents this, explains why it does not filter at that layer (filtering after pagination returns short pages and a total describing one of them), and says a caller who must exclude them can, because `source` is on every record and a plugin holds `ctx.config.singles`. A removed Single kept completeness withheld for ever, over content the app no longer has. Both unreadable cases keep the Single counted rather than dropping it: a row with no readable slug, and a configuration this could not enumerate. An unreadable config is not an empty one — read as declaring nothing, every row becomes an orphan and completeness is granted over the whole site. A Builder-made Single is never an orphan. Its registry row IS the declaration, so configuration saying nothing about it is not evidence that it was removed.
…e per scope `advanceBackfill` read `state.completed()` on every call, and the job handler calls it once per scope. The production store answers that by paging the WHOLE progress collection, so a handler walking N scopes paged it N times — quadratic in the number of scopes, and on a site of many small ones most of what the drain does is re-reading rows the same invocation already read. The handler reads it once and threads it, and each pass hands back the set including what it just recorded. Reading from the store stays the default for a caller making a single pass. Threading is also the more stable answer, which is the reasoning already written above the recompute: re-reading folds in whatever another instance recorded meanwhile, making the result depend on timing rather than on this handler. The store fixture counts its reads now. "Did this read the store at all" is the property — a test asserting only the outcome passes whether or not the set was threaded.
…evision The bounds and the index slugs say what the documents were read as and where the result was put. Neither moves when a RELEASE changes what a walk EXTRACTS from one document. So a fix that starts finding a reference the old code missed leaves every already-walked scope recorded, and the component it now finds stays at an exact zero until each document happens to be saved — an exact count over rows the current code would not produce, which is what permits deleting something in use. `DERIVATION_REVISION` is in the key now, with the rule for changing it written beside it: bump it when the same document under the same bounds would yield different rows, and not when the walk merely gets faster or a bound moves. Nothing has shipped — the backfill's changeset is in this pull request — so no installation has progress to invalidate.
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| step: { fields: readonly unknown[]; addressable: boolean }, | ||
| expanded: WeakSet<object> | ||
| ): void { | ||
| if (expanded.has(container)) return; |
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When one nameless group object is reused first at the top level and later beneath a named group, the first traversal adds it to this identity-only WeakSet; the nested traversal is then skipped even though it has different addressable state. The survey consequently returns unaddressable: false, so health may certify the index as exact while references stored under the named group were never indexed, potentially allowing an unsafe deletion. Track visits by both object and addressability, or derive the addressable traversal from the canonical helper rather than maintaining a second implementation.
AGENTS.md reference: AGENTS.md:L299-L302
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Confirmed and fixed in 1ef68171f. Sharp one — the shared-object case is not something I would have reached for, and it is reachable for free: a host that hoists a nameless group into a constant and uses it twice gets one object in two places.
Your chain is exact. The two occurrences store their data under DIFFERENT keys, so the blocks field inside is addressable through the top-level path and not through the nested one. Keyed by identity alone, the first visit claimed the object and the second was skipped — the field was enumerated as a scope for the reachable path and never reported as unreachable for the hidden one. So the survey said nothing was out of reach while half of that field's content was.
Keyed by the container AND by what reaching it that way means now. Two WeakSets rather than a set of pairs, because the flag is a boolean and a WeakSet is what lets a declaration object be collected.
I took the first of your two remedies rather than the second, and the reason is worth saying: there is only ONE traversal here, not a second implementation beside a canonical helper. blocksFieldsOf is already derived from blocksFieldSurvey, which is the single walk, and stepFor is its classifier. So there was nothing to converge onto — the fault was the key, not a duplicate.
The change is also exactly the one that could make the walk unbounded, so that has its own test: a group that contains ITSELF, reached both ways, must still terminate. Each container is expanded at most once per mode, so it goes twice round instead of once.
Tests: "reports a SHARED group reached both ways, not only the first way" asserts both halves — still enumerated for the reachable path, no longer silent about the hidden one — and "still terminates when a shared group contains ITSELF". Break-verified by keying on one set again, which kills both.
| const inCollection = await args.read({ | ||
| where: { ...referencing, [COLLECTION_COLUMN]: { equals: entity } }, | ||
| groupBy: DOCUMENT_COLUMN, | ||
| }); |
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When references move between collections during this two-stage read, the result need not correspond to any database state: the outer query can observe collection A, a reference can then be inserted in B before the last reference in A is removed, and this inner query returns zero for A while B is never queried. The function consequently returns documents: 0, complete: true even though the component remained referenced throughout, so an author may treat an in-use component as safe to delete. Group (entity, entityKey) in one database snapshot, or keep the result incomplete when the multi-query read cannot be made consistent.
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Confirmed at the mechanism, and NOT fixed — because neither of your two remedies is available to a plugin, and I would rather say which than pick the one that quietly removes the feature.
Your interleaving is real and I can restate it exactly: the outer query observes collection A, a reference is inserted in B and the last one in A removed, the inner query returns zero for A, and B is never asked. documents: 0, complete: true for a component that was referenced throughout — an exact zero, which is what licenses the delete.
Grouping the pair in one query is not available. GroupArgs.groupBy is groupBy: string — a single field. There is no multi-column grouping on the Direct API, and nothing there gives a plugin a read snapshot to hold the two stages inside.
Keeping the result incomplete whenever the read cannot be made consistent means keeping it incomplete always, since it never can be. That removes exact counts entirely — and a floor is already what an unbacked index reports, so the backfill would buy nothing. I do not think that is the trade you are proposing, but it is the only form of your second option a plugin can implement.
So this is a core capability, filed with both candidate shapes:
groupByaccepting several fields. Smaller, and fixes the count directly.- A read snapshot a plugin can hold across calls — a read
transaction, or an epoch a caller pins and the server refuses to answer outside. Closes this AND the health-snapshot thread beside it, which is the same gap from the other end.
Worth naming the pattern, because it now decides more than one thread: three findings across my open pull requests want a non-skippable WRITE boundary, and these two want a consistent READ snapshot. Two capabilities, five findings — and better decided as two questions than as five patches.
One honest bound on the exposure, since the count is still worth shipping: it needs a reference to move BETWEEN tracked collections during a single count, which means a document deleted in one and created in another in that window. A reference added or removed within one collection is caught, because that collection's own inner query is the one that reads it.
| // such a caller these callbacks are never evaluated. Closing that needs a | ||
| // write boundary external collection operations cannot cross, which is a | ||
| // core capability rather than an access rule a plugin can declare — | ||
| // recorded as `finding:backfill-progress-is-forgeable-by-a-super-admin`. |
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This comment records an external review finding identifier rather than describing only the code; plugin-entry-graph.test.ts similarly embeds finding:page-builder-root-is-not-isomorphic. Preserve the technical explanation but remove these tracker references, which the repository explicitly forbids in code comments.
AGENTS.md reference: AGENTS.md:L288-L290
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Confirmed and fixed in 1ef68171f, and thank you for catching it — this is a repository rule I broke in several places today, not a slip in one comment.
AGENTS.md is explicit: comments "describe the code only: never reference tasks, plans, conversations, or review findings." I had put ledger node ids in four comments across both of my open pull requests — usage-backfill-state.ts and plugin-entry-graph.test.ts here, and two more on the cycle-guard branch, all now removed.
The technical explanations stay, which was your instruction and the right one: what the comments were FOR was the mechanism, and the identifier was a pointer I added for my own convenience. Where a comment pointed at a node for the remedy, the remedy is now stated inline — so the reader gets the thing the pointer was pointing at.
Worth noting for whoever maintains the gate: check-comment-convention.mjs did not refuse any of these. It catches phrasing that reads as a review iteration — it flagged a docblock of mine on the other branch for exactly that — and a bare node id does not trip it. So the check is narrower than the rule it enforces, and the gap is precisely "a comment that names a tracker without sounding like one".
I am not proposing a change to the gate in this pull request, since widening it is its own decision and a false positive there would be paid by everyone. But it is worth knowing that the rule is currently held by review rather than by the check.
| return { | ||
| documents, | ||
| complete: !grouped.truncated && indexIsWhole(args.health), | ||
| complete: !truncated && placeable && indexIsWhole(args.health), |
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When a screen reads marker-free health and a document is subsequently saved in an undetermined state before this count runs, maintenance replaces that document's references with an unreadable marker, but this expression still combines the new zero count with the earlier anyUndetermined: false. It therefore returns complete: true for a component that may be present beyond the document's traversal bound. Read the count and health under a consistent ordering or version fence rather than reusing a health snapshot that normal writes can invalidate.
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Confirmed at the mechanism, and not fixed here — it is the same missing capability as the two-stage grouping thread beside it, and I have filed them together rather than twice.
Your ordering is right. readUsageIndexHealth reads completeness and the unreadable-marker probe, the count is a separate call, and a document saved in an undetermined state between them replaces its references with a marker while the earlier anyUndetermined: false still stands. A fresh zero combined with a stale "nothing unreadable" reports complete: true.
What I want to point at is that the reads WITHIN one health call are already ordered deliberately for exactly this shape — completion first, so the writer's ordering is preserved and the two observations cannot come from either side of one write. That comment is in usage-index-health.ts and it is load-bearing. It closes the interleaving inside one health read and cannot close one between the health read and the count, because those are two calls with no shared boundary. A version fence is the right instrument and there is nothing to fence WITH.
So: groupBy taking several fields would fix its sibling and not this one; a read snapshot a plugin can hold across calls fixes both. Filed with both shapes and a recommendation for the second.
Not attempted in the meantime, deliberately. The available approximations — re-reading health after the count and comparing, say — narrow the window without closing it, and a narrowed race is the kind that stops being reproduced and starts being assumed absent. I would rather this stayed a known gap than became a mechanism that reads as a fence.
The survey's visit set was keyed on the container object alone. A host that hoists a nameless group into a constant and uses it twice — once at the top level and once beneath a named group — gets one object in two places, and the two occurrences store their data under DIFFERENT keys. So the blocks field inside is addressable through one path and not through the other. Keyed by identity alone, the first visit claimed the object and the second was skipped: the field was enumerated as a scope for the reachable path and never reported as unreachable for the hidden one. The survey said nothing was out of reach while half of that field's content was, and health could call the index exact over it. Keyed by the container AND by what reaching it that way means now. Two sets rather than a set of pairs, because the flag is a boolean and a WeakSet is what lets a declaration object be collected. Each container is still expanded at most once per mode, so a group that lists itself terminates — twice round instead of once, which has its own test because two sets is exactly the change that could make it unbounded. Also removes two ledger node ids from comments. AGENTS.md says comments "describe the code only: never reference tasks, plans, conversations, or review findings", and the convention gate does not catch a node id — only phrasing that reads as a review — so nothing refused them. The explanations stay; where one pointed at a node for the remedy, the remedy is stated inline.
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| // Both, and neither implies the other. Every scope walked says the work this | ||
| // index CAN do is done; unreachable content says there is content it cannot | ||
| // do at all, and a site can be in either state independently. | ||
| return backfillComplete(scopes, completed) && !unreachable; |
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After a scope has been recorded, any later post-commit maintenance failure leaves its progress row untouched: class-usage-hook.ts explicitly keeps the content write committed and reports the index stale, but this check still sees every scope as completed and no unreadable marker. If inserting a newly referenced component fails transiently, subsequent counts therefore return complete: true with an undercount, potentially permitting deletion of a component the saved document still uses. Persist a dirty/failure marker or invalidate the affected scope so a later sweep must rebuild it before health becomes exact again.
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The mechanism is real and confirmed; the stated consequence is not, and the
difference changes the priority.
Confirmed: usageIndexHealth decides exactness from
backfillComplete(scopes, completed) && !unreachable, and neither is touched
when class-usage-hook fails its post-commit maintenance — that path
deliberately keeps the content write committed and reports the index stale, and
writes no marker against the scope. So a transient failure does leave health
claiming an exact index over an undercount, and that claim is on a published
service (USAGE_HEALTH_SERVICE, exported from the package index).
Not confirmed: "potentially permitting deletion of a component the saved
document still uses." Measured rather than assumed — there is exactly ONE
beforeDelete hook on the components collection, layout-component-guard, and
it reads LIVE through layout-component-usage rather than from the index. That
module's own docblock gives this as its reason: "A refusal has to be exact AT THE
MOMENT IT REFUSES. An index is eventually consistent." No delete path reads
COMPONENT_USAGE_INDEX_SLUG at all — its only references are the collection
registration and the backfill wiring.
So the data-loss route is closed by design already. What remains is a health
signal that can lie and a count that can under-report, which is worth fixing and
is not a P1.
This PR is MERGED, so it cannot be fixed here. Filed as
finding:usage-health-reports-exact-after-a-failed-maintenance against
task:pb6-t5-safe-delete-as-a-job, which already carries the related staleness
findings. The remedy shape recorded there is your suggestion: persist a dirty
marker per affected scope so exactness is withheld until a sweep rebuilds it —
which fits the axis this area already has, since health separates
backfilled-and-clean from unreadable today.
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Follow-up to #1690, which shipped "used on N pages" with
coversExistingDocumentsfalse unconditionally — nothing filled the index for documents that predate it, so no reading could honestly say otherwise. This is what makes that answerable.The write hooks maintain the indexes going forward. A site that installed this plugin over existing content held a table whose every answer is "references nothing", which is indistinguishable from a component genuinely used nowhere — and that is the answer a delete decision acts on.
Why a sweep
Nobody is in a position to enqueue this. The work is owed from the moment the plugin meets existing content, and the events that make it owed — an upgrade, a collection gaining a blocks field — are not things any handler sees.
Each pass walks one
(collection, field, locale, variant): the smallest unit a rebuild can finish, so the largest one certain to make progress. It stops at the runner'sdeadlineand defers the rest, which the durable queue makes safe.The four findings from #1690, each answered
These were raised by review on the earlier combined PR and are the reason it was split. Every one is a distributed-systems property rather than a slip.
A partial rebuild is no longer recorded as done.
rebuildPageBuilderUsageIndexesresolves on a partial repair — it returns what happened, because it also runs as a repair where a caller wants the counts. A backfill cannot use that answer the same way: the next thing it does is write a row no later pass revisits. It now refuses onfailure,unrepairedandundetermined— refusing only on the first would leave the narrower version of the same defect.Keyset paging, not offsets. Deleting a document the walk has already passed shifts everything behind it back, so an offset walk never visits the row that crosses the boundary. A repair survives that: the missed document keeps its rows, and the orphan sweep will not remove them unconfirmed. A first fill does not — it has no rows for anything to protect, the walk returns without a failure, and the scope is recorded for ever. Break-verified: restoring offset paging fails the concurrent-delete test.
Collections come from the live registry.
class-usage-hookopens by saying the set of collections is not known when a plugin is wired — which is why the write path registers on a wildcard. The Schema Builder creates collections at runtime and those exist only in the registry, so reading configuration walked a narrower population than the hooks maintain while judging readiness against that same short list. The listing is paginated, so it is exhausted rather than assumed to fit, and a page it cannot parse is a refusal rather than a short answer.Progress belongs to a generation. Changing
pageBuilder({ limits })changes what every row should say, and both directions are wrong differently: loweringmaxNodesleaves rows for nodes the renderer no longer reaches; raising it leavesunreadablemarkers standing so every count is a floor for ever — which reads as the completeness flag working rather than as stale state. The generation sits beside the scope key rather than inside it, so identity stays put and a re-walk reconciles the old rows instead of orphaning them.What refuses rather than guesses
id, since the cursor is an id and falling back to offsets quietly is the behaviour being removed.Verified
plugin-page-builder: 865 tests pass, lint 0, check-types 0fallow audit --base origin/main: pass, 15 files, no introduced complexity or dead codechangeset status: validSummary by CodeRabbit
New Features
Bug Fixes