fix(db): preserve mutation reconciliation semantics

[KyleAMathews]

Repairs established Core mutation and reconciliation defects: same-key delete→insert sequences now reduce against authoritative state without losing concurrent intent, sync publications keep the correct immutable before-image, and local-only/local-storage echoes preserve whole-row replacement shape. Persistence, indexes, storage, and subscribers converge without a new API or conflict policy.

Root cause

• The transaction mutation truth table treated delete→insert as unreachable. The first repair also trusted visible mutation original values, which may belong to another pending overlay; repeated deletes could then silently collapse a real replacement to zero mutations.
• Sync publication diffing needed provider previousValue for a valid live-reading row object, but trusting it for ordinary replacement objects let stale or partial provider snapshots override the collection's pre-sync visible row. Queued rollback could publish the wrong before-image and corrupt index refcounts.
• A buffered delete was enriched only when a later insert flushed the batch. Providers that reused and mutated the row object could therefore change the buffered before-image.
• Local-only and local-storage loopback sync used partial update merging, which resurrected fields deliberately omitted by a same-key replacement.

Approach

• Reduce delete→insert against the collection's authoritative syncedData: no authoritative row remains an insert, an exact restoration cancels, and a real replacement becomes one update with a symmetric key-union diff, structural equality, final metadata, and merged sync metadata.
• Keep the collection's pre-sync visible snapshot authoritative for ordinary replacement objects. Use provider previousValue only when an update reuses the exact stored live-reading object, and preserve only the first operation's before-image per key.
• Snapshot buffered deletes, including virtual properties, when they enter the batch; coalescing later reads that captured value directly.
• Mark local-only and local-storage loopback sync as full-row so replacement omissions remain absent in memory, durable storage, and reload.

Key invariants

• Exact restoration produces no persistence call; every real replacement reaches persistence exactly once, including concurrent pending overlays and repeated deletes.
• A row that exists only in another pending insert is delivered as an insert; a replacement over an authoritative row is delivered as an update.
• Removed, added, null, and undefined fields remain distinguishable in changes and replacement shape.
• A queued sync released by rollback publishes the actual prior optimistic row and leaves BTree membership/refcounts only at the final value.
• Replacement-object redelivery with stale or partial previousValue is suppressed when the row did not change; an unseen key still publishes as an insert.
• Valid same-reference live rows publish from the provider's immutable before-image, including repeated and nullish values.
• Failed sync sessions do not leak before-image state into restart or later publication.

Non-goals and design gates

• A provider that reuses the exact stored row object must supply an immutable, complete previousValue. A stale or partial previousValue on that same reference is observationally indistinguishable from the valid live-getter case. This PR does not add provenance/version/completeness state to distinguish it.
• This does not infer immediate temp-key→server-key or concurrent direct-write acknowledgements. Distinct-key association has no causal mutation identity today; correct support needs an explicit per-mutation acknowledgement/key mapping such as the excluded mutation-log design work in RFC: Mutation log reconciliation for optimistic writes #1625.
• This adds no public API, status, conflict policy, export, dependency, compatibility branch, or persistent collection field.
• The Core seed found on fix(electric-db-collection): preserve PostgreSQL query semantics #1832 is not claimed as a new Wave 1 fix: it is RED on that PR's older 3b991173 base and GREEN with merged fix: preserve accepted snapshots and fence stale replay reads #1822 (3ad64a42).

Trade-offs and client weight

The repair adds one batch-local map for first-operation before-images and otherwise reuses existing authoritative state, structural equality, virtual enrichment, and cache machinery. A private mutation-lineage WeakMap was deleted after adversarial review showed authoritative state was both smaller and correct across repeated concurrent overlays. Full-row loopback configuration is two one-line settings rather than adapter-specific mutation branches.

• Production source: +80 / -10 lines, net +70 (+2,547 bytes) across five files.
• Normal ESM: +1,869 raw / +364 deterministic gzip / +308 Brotli bytes.
• Normal CJS: +1,878 raw / +358 deterministic gzip / +347 Brotli bytes.
• Total normal output: +3,747 raw / +722 gzip / +655 Brotli bytes.
• Minified ESM: +1,236 raw / +321 deterministic gzip / +301 Brotli bytes.
• Minified CJS: +780 raw / +257 deterministic gzip / +225 Brotli bytes.
• Total minified output: +2,016 raw / +578 gzip / +526 Brotli bytes.
• Normal npm pack: +2,458 packed / +13,944 unpacked bytes; 641 entries unchanged.
• Minified npm pack: +2,660 packed / +12,328 unpacked bytes; 641 entries unchanged.

The final deletion pass removes 12 net production lines from reviewed head 58c5210; the CodeRabbit/external-review work is now net -11 lines over 7a21b713. Fail-fast was rejected for established successful delete→insert and local replacement behavior. The unresolved same-reference stale-provider regime cannot be identified reliably enough to throw without also rejecting valid live rows. Despite the reduction, every required artifact metric remains positive versus base, so the PR is held for explicit approval under the zero-net shipped-code policy.

A final Design Grammar pass tested composing the changed-key Set with the first-operation Map, reusing publication/diff/adapter machinery, consolidating transaction cases, and simplifying the provider-before-image expression. The carrier fusion grew minified compressed output and needed a subtle metadata-placeholder rule. The expression-only variant saved at most 48 raw / 10 gzip bytes, was Brotli-neutral, and changed invalid runtime previousValue: null handling. Both were rejected. Production code and every shipped artifact remain byte-for-byte identical to reviewed head 558bb9e1; the follow-up adds only durable metadata-first, symbol, key-order, and virtual-before-image test controls.

Verification

Exact merge base 3ad64a42 RED with the permanent oracles injected:

• delete→insert laws: 8/8 fail at the unhandled combination;
• immutable live-row previous-value cells: 4/4 fail;
• PowerSync-discovered seed/path: deterministic prior-row publication failure.

Follow-up same-path RED on reviewed head 7a21b713 independently reproduced:

• queued rollback published the provider before-image instead of the visible optimistic row and left BTree membership under two values;
• replacement-object redelivery and a partial before-image emitted spurious changes; the partial path incremented the numeric range-domain refcount;
• concurrent overlay delete→insert, including duplicate deletes and an absent authoritative row, silently skipped persistence;
• local-only and local-storage memory resurrected omitted fields;
• a buffered delete reused after mutation exposed the new value as previousValue.

The unseen-key review claim was refuted on its exact public path: an initial-state subscriber receives the empty initial batch followed by an insert with undefined previous value.

pnpm --filter @tanstack/db exec vitest run \
  tests/collection-state-retention-oracle.property.test.ts \
  tests/optimistic-transaction-oracle.property.test.ts \
  tests/local-only.test.ts tests/local-storage.test.ts \
  --coverage.enabled=false --maxWorkers=1

pnpm --filter @tanstack/db exec vitest run \
  --coverage.enabled=false --typecheck.enabled=false

pnpm --filter @tanstack/db lint
pnpm --filter @tanstack/db build
pnpm --filter @tanstack/db build:minified

Results:

• Focused owner matrix with test type-checking: 196/196; no type errors.
• Complete oracle matrix: 36 files, 2,032 tests; no type errors.
• Full DB assertions: 201 files, 6,186 tests passed. The all-files command exits nonzero on 35 existing workspace rootDir source-resolution errors for sibling db-ivm and db-collection-e2e files; focused/oracle typechecks are clean.
• ESLint, Prettier, declaration/type build, normal build, minified build, and diff checks: clean.
• Six hostile mutant families killed: historical unhandled reduction, trust-all provider snapshots, the reviewer's equality classifier, raw buffered deletes, visible-overlay/WeakMap mutation fallback, and partial local loopback echo.

Randomized discovery replays:

• PowerSync PR fix(powersync): preserve updates and support PowerSync 2 #1831 incidentally surfaced Core property collection-state.optimistic-history, seed -856365087, path 73:1:3:3:3:3:14:13:16:17:20:17:17:17. Its adapter branch did not change Core; the exact replay is GREEN here.
• Electric PR fix(electric-db-collection): preserve PostgreSQL query semantics #1832 incidentally surfaced seed 385190822, path 86:3:4:5:9:9:10:10:10:10:16:3:22:22:25:30:5:7:20:24:25:27:28:28:28:21:22:22. Electric remains unchanged; the exact replay is GREEN here.

Files changed

• packages/db/src/transactions.ts: complete authoritative same-key mutation reduction.
• packages/db/src/collection/state.ts: identity-gated first-before-image publication and live-object cache invalidation.
• packages/db/src/collection/changes.ts: snapshot buffered delete rows and virtual state before reference reuse.
• packages/db/src/local-only.ts, packages/db/src/local-storage.ts: preserve full-row replacement shape through loopback sync.
• Core transaction/retention and local adapter tests: deterministic algebra, lifecycle, index/refcount, publication, storage/reload, and hostile controls.
• Changeset: patch release note for @tanstack/db, including the same-reference provider boundary.

Provenance and credit

Source	Credit	Contribution carried forward
#1068 / 50b09dc	Marc MacLeod (marbemac, author/reporter); oschade (confirmation); Sam Willis (samwillis, discussion)	Reproducer and delete→insert cancellation/update direction. This implementation adds symmetric removal, authoritative membership, and repeated/concurrent handling.
#1445 / 55055bbd, edbd2935	SamJB123 (author)	Per-key immutable sync previousValue diagnosis and repair direction, hardened for batches, overlays, replacement objects, nullish values, and cleanup.
#1442	Ben Guericke (goatrenterguy, reporter/analysis); am1006 (timeline, workaround, confirmation)	Immediate direct-write timelines and writeUpsert diagnostic controls.
#1465 / 57a7d0d	Ben Guericke (goatrenterguy, author); Claude Opus 4.6 (claude, co-author)	Direct-write regressions and historical global-tracking approach. Its code/tests are not ported because distinct-key/concurrent attribution remains design-gated.
#1213 / 9952921e	Sam Willis (samwillis, PR author); Cursor Agent (cursoragent, implementation); autofix-ci[bot] (formatting); Kevin Deisz (kevin-dp, review)	Virtual-property and optimistic-retention foundation.
#1547 / 6238a2d8	Kyle Mathews (author); Claude Opus 4.6 (co-author); Sam Willis (samwillis, approval); CodeRabbit (review)	Existing direct-row cleanup foundation.
#1797 / cfb01cee	Kyle Mathews (author); CodeRabbit (review)	Introduced buffered delete→insert event collapse, the seam exposed by the #1831 replay.
#1807 / 025a0799	Kyle Mathews (author); Tanner Linsley (tannerlinsley, approval); CodeRabbit (review)	Whole-snapshot and publication lifecycle foundation.
#1822 / 3ad64a42	Kyle Mathews (author); CodeRabbit (review)	Required merged base and accepted-snapshot retention behavior.
#1831 / 2f80f5af	Kyle Mathews (author); Ali Ansari (AliNaqiAnsari), lukasz wolski (lukiwolski), Simon Binder (simolus3), and Kirill Kleymenov (illkle) (co-authors); Simon (approval); CodeRabbit (review)	Incidental randomized Core discovery witness only; the repair stays in generic Core.
#1832 / 1d854e81	Kyle Mathews (author); Miguel Romero Karam (miguelrk) and Viktor Maigaard (viktor89) (co-authors); CodeRabbit (review)	Incidental upstream #1822 validation witness only.
PR #1835 review	CodeRabbit, review 5227854376 / comment 4030381054	Identified that a reused provider object could mutate a buffered delete before coalescing; this follow-up snapshots deletes when they enter the batch.
Separately supplied external review	Reviewer identity was not supplied	Added rollback/index, unseen-key classification, replacement-object stale/partial, concurrent delivery, and local adapter echo/reload challenges.

Supersedes #1068 and #1445. Incorporates diagnostic prior art from already-closed #1442 and open #1465; immediate distinct-key and concurrent direct confirmation remain design-gated and are not claimed fixed here.

Summary by CodeRabbit

• Bug Fixes
  • Fixed transaction handling for delete-then-insert operations involving the same record.
  • Preserved accurate previous values, optimistic metadata, and change details during reconciliation.
  • Prevented stale values when live row data changes without an identity change.
  • Improved change publication across repeated updates, optimistic rollbacks, failed sync sessions, and truncation rebuilds.
  • Correctly handles restored, modified, and repeatedly replaced records without errors.
  • Ensured full-row replacements remove fields omitted from replacement data in local collections and storage.
  • Preserved complete replacement values across local adapters and sync updates.

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Run ID: bca95b70-efac-4cf5-b90d-67fae650b337

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📒 Files selected for processing (2)

• packages/db/tests/collection-state-retention-oracle.property.test.ts
• packages/db/tests/optimistic-transaction-oracle.property.test.ts

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📝 Walkthrough

Walkthrough

The change reduces same-key delete-insert mutations, preserves sync before-images, enriches buffered deletes, and publishes corrected change metadata. Local adapters now apply full-row updates. Tests cover reconciliation, publication, rollback, and replacement persistence.

Changes

Mutation reconciliation and publication

Layer / File(s)	Summary
Delete-insert mutation reduction packages/db/src/transactions.ts, packages/db/tests/optimistic-transaction-oracle.property.test.ts	Mutation merging now cancels restored delete-insert pairs or converts replacements into updates with diffed fields and merged metadata. Tests cover repeated replacements, duplicate deletes, nested values, persistence, settlement, and rollback.
Publication before-image retention packages/db/src/collection/changes.ts, packages/db/src/collection/state.ts, packages/db/tests/collection-state-retention-oracle.property.test.ts	Collection state retains the first applicable sync before-image, clears stale virtual-property snapshots, and uses the retained value for publication classification and previousValue. Tests cover live values, batches, truncation, optimistic overlays, failed sessions, and rollback.
Full-row local synchronization packages/db/src/local-only.ts, packages/db/src/local-storage.ts, packages/db/tests/local-only.test.ts, packages/db/tests/local-storage.test.ts, .changeset/fix-mutation-reconciliation.md	Local sync configurations now use full-row updates. Tests verify that omitted replacement fields stay absent in memory, storage, and reload. The changeset documents these fixes and the immutable provider previousValue requirement.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 01fc8

The change updates same-key reconciliation, before-image publication, and full-row local sync behavior with targeted regression coverage. No concrete merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 2 | ❌ 3

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	Issue #1442 requires removal of the optimistic client-key row when sync data uses a different key. It also requires same-key sync data to mark the row as synced and expose server fields, with coverage…	Implement client-key to server-key reconciliation for writeInsert and refetch flows. Reconcile same-key responses so the row becomes $synced and exposes server fields. Add automated tests for the three #1442 reproduction cases and the s…
Out of Scope Changes check	⚠️ Warning	The PR adds generic @tanstack/db delete-then-insert mutation reduction, before-image publication changes, buffered-delete handling, and full-row modes for local-only and local-storage adapters. The …	Remove the unrelated core and local-adapter changes from this PR, or associate them with a separate coding issue. Keep this PR focused on #1442 reconciliation and its regression tests.
Docstring Coverage	⚠️ Warning	Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 9 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the database mutation-reconciliation fix and matches the primary changes.
Description check	✅ Passed	The description is detailed and covers the changes, motivation, approach, trade-offs, verification, release impact, and non-goals. It does not use the repository template headings or include the check…

Full details: Linked Issues check

Explanation

Issue #1442 requires removal of the optimistic client-key row when sync data uses a different key. It also requires same-key sync data to mark the row as synced and expose server fields, with coverage for writeInsert, refetch, and no-explicit-write flows. The PR changes packages/db transaction reduction, publication before-images, and local sync row modes. The focused diff shows no changes in packages/query-db-collection/src/query.ts or packages/query-db-collection/tests/query.test.ts. The PR summary explicitly excludes client-key-to-server-key association. Therefore the different-key requirement and the linked issue's reproduction coverage remain unmet.

Resolution

Implement client-key to server-key reconciliation for writeInsert and refetch flows. Reconcile same-key responses so the row becomes $synced and exposes server fields. Add automated tests for the three #1442 reproduction cases and the safe no-explicit-write flows.

Full details: Out of Scope Changes check

Explanation

The PR adds generic @tanstack/db delete-then-insert mutation reduction, before-image publication changes, buffered-delete handling, and full-row modes for local-only and local-storage adapters. The added tests cover these core and local-adapter behaviors. The linked issue concerns optimistic insert reconciliation in query collections, and the focused diff contains no query-collection implementation or reproduction-test changes. These changes are not shown to implement the linked issue's key reconciliation requirements.

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commit: 01fc89d

[github-actions]

Size Change: +325 B (+0.2%)

Total Size: 165 kB

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Filename	Size	Change
packages/db/dist/esm/collection/changes.js	2.25 kB	+27 B (+1.21%)
packages/db/dist/esm/collection/state.js	6.51 kB	+76 B (+1.18%)
packages/db/dist/esm/local-only.js	989 B	+14 B (+1.44%)
packages/db/dist/esm/local-storage.js	2.17 kB	+14 B (+0.65%)
packages/db/dist/esm/transactions.js	3.71 kB	+194 B (+5.52%)	🔍

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packages/db/dist/esm/collection-options.js	236 B
packages/db/dist/esm/collection/change-events.js	1.44 kB
packages/db/dist/esm/collection/cleanup-queue.js	794 B
packages/db/dist/esm/collection/events.js	481 B
packages/db/dist/esm/collection/index.js	4.58 kB
packages/db/dist/esm/collection/indexes.js	1.99 kB
packages/db/dist/esm/collection/lifecycle.js	2.15 kB
packages/db/dist/esm/collection/mutations.js	2.53 kB
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packages/db/dist/esm/collection/sync.js	4.62 kB
packages/db/dist/esm/collection/transaction-metadata.js	144 B
packages/db/dist/esm/deferred.js	207 B
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packages/db/dist/esm/event-emitter.js	964 B
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packages/db/dist/esm/indexes/index-registry.js	820 B
packages/db/dist/esm/indexes/reverse-index.js	376 B
packages/db/dist/esm/live-query-adapter.js	318 B
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packages/db/dist/esm/live-query-options.js	702 B
packages/db/dist/esm/live-query-window-controller.js	4.36 kB
packages/db/dist/esm/optimistic-action.js	359 B
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packages/db/dist/esm/utils/get-or-create.js	155 B
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packages/db/dist/esm/virtual-props.js	360 B

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Size Change: 0 B

Total Size: 7.34 kB

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Filename	Size
packages/react-db/dist/esm/DbProvider.js	317 B
packages/react-db/dist/esm/HydrationBoundary.js	263 B
packages/react-db/dist/esm/index.js	330 B
packages/react-db/dist/esm/live-query-internals.js	282 B
packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.9 kB
packages/react-db/dist/esm/useLiveQuery.js	2.68 kB
packages/react-db/dist/esm/useLiveQueryEffect.js	355 B
packages/react-db/dist/esm/useLiveSuspenseQuery.js	812 B
packages/react-db/dist/esm/usePacedMutations.js	401 B

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@packages/db/src/collection/changes.ts`:
- Around line 152-153: Update the batched delete handling around
enrichChangeWithVirtualProps so previousValue uses an immutable enriched
before-image captured when the delete enters batchedEvents, rather than
enriching the mutated pending row during flush. Preserve the existing coalescing
behavior while preventing reused provider-row replacement fields from appearing
in the delete snapshot.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3ad64a4 and 7a21b71.

📒 Files selected for processing (6)

• .changeset/fix-mutation-reconciliation.md
• packages/db/src/collection/changes.ts
• packages/db/src/collection/state.ts
• packages/db/src/transactions.ts
• packages/db/tests/collection-state-retention-oracle.property.test.ts
• packages/db/tests/optimistic-transaction-oracle.property.test.ts

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