perf(mobile): keep chat history safe on failed loads, index and cache RAG vectors by alichherawalla · Pull Request #718 · off-grid-ai/OGAM

alichherawalla · 2026-10-14T14:36:12Z

Mobile release-candidate performance and safety pass. Pins mobile-pro on the same branch and pairs with the shared PR on the same branch name.

Storage safety

Failed reads: stores no longer open their write gate after a failed read (Zustand calls the hydration callback with an error). Before, an empty store could overwrite saved chat history. Applied to chat, app, auth, project, remote-server and whisper stores.
Failed writes: a snapshot counts as saved only after its write commits, so a failed write of the same content is retried.
Android storage cap: AsyncStorage_db_size_in_MB=64. The default is 6 MB, and history was measured at 5.79 MB.
Write coalescing was dropped. It broke stableIdentity.integration.test.ts, which checks that a relaunch right after a change keeps it. The real fix for full-history rewrites is the deferred SQLite chat store.

RAG

Indexes: idx_rag_embeddings_doc_id, idx_rag_chunks_doc_id_position, idx_rag_documents_project_id_enabled.
Atomic deletes: per-document and per-project deletes run in one transaction.
Vector cache: a 16 MB LRU of decoded Float32Array vectors, used only when its embedding ids match the live query. The query adds ORDER BY e.id so tied results keep their pre-index order.

Pro (submodule)

WAL for the sync store; chat projection repair skips messages already shown.

Compatibility

Baselines: v0.0.114-beta.1 (newest) and stable v0.0.111.
The stored JSON format is unchanged, and an old-format snapshot loads.
Index creation is idempotent. The RAG upgrade test opens databases written by older releases (with and without sync_id) and keeps every row.

Verification (local)

Checks: eslint, tsc, tsc -p pro, depcruise and knip pass.
Jest: 8,355 passed. stableIdentity passed after coalescing was dropped.
Known local-only failures:
- releaseScriptsE: GNU vs BSD mktemp on Linux; CI runs on macOS.
- releaseCandidateE M5: a timeout.
- speakAfterVoiceModelUnload: missing navigation context under parallel workers.
Please confirm on an Android device: legacy AsyncStorage reads each value through a SQLite cursor, often capped at 2 MB per row. A single ~4.9 MB chat value may be why reads fail in the first place, and raising the size cap doesn't change that.

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Summary by CodeRabbit

Bug Fixes
- Search results remain consistent after document updates, deletions, and project changes, with more reliable handling of stored embeddings.
- Local data is marked as ready only after successful restoration, reducing the risk of changes being lost when storage reads fail.
Improvements
- Increased the Android local storage limit to 64 MB.
- Similarity scoring supports typed-array vectors as well as standard arrays.
- Existing databases retain search behavior when upgraded.

… RAG vectors - Stores never open their write gate after a failed read, so an empty store can no longer overwrite saved history; a snapshot counts as saved only after its write commits, so a failed write is retried. - Android AsyncStorage size cap raised to 64 MB (history was at 5.79 MB of 6). - RAG: indexes on embeddings(doc_id), chunks(doc_id, position) and documents(project_id, enabled); per-document deletes are atomic; decoded vectors are cached (16 MB LRU) and checked against the live embedding ids, with the original tie order pinned. - Pro: sync store uses WAL; chat projection repair skips shown messages. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016JzAmMBhYRz9FHP1r3mEVr

coderabbitai · 2026-10-14T14:36:48Z

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__tests__/pro/sync/KnownDevicesSection.integration.test.tsx
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📝 Walkthrough

The change updates RAG embedding decoding, vector caching, retrieval, and mutation handling. It also changes persisted-state hydration, adds sync integration tests, raises the Android AsyncStorage database cap, and updates the pro subproject reference.

Changes: RAG embedding retrieval

Layer / File(s)	Summary
Typed vector representation `src/services/rag/database.ts`, `src/services/rag/vectorMath.ts`, `__tests__/unit/services/rag/database.test.ts`	Embedding decoding returns `Float32Array` values and handles typed-array offsets and unaligned slices. Vector scoring functions accept `ArrayLike<number>` inputs.
Cached embedding retrieval `src/services/rag/database.ts`	The database adds lookup indexes and a bounded per-document vector cache. Retrieval orders embedding IDs, reuses vectors when IDs match, and aligns vectors with requested IDs.
Mutation handling and retrieval validation `src/services/rag/database.ts`, `__tests__/integration/rag/*`	Document and project mutations invalidate cached vectors, and deletions use transactions. Integration tests cover search consistency, mutations, scoped reads, and legacy database upgrades.

Persisted-state hydration

Layer / File(s)	Summary
Snapshot write tracking `src/utils/hydrationGatedStorage.ts`, `__tests__/unit/utils/hydrationGatedStorage.test.ts`	Storage tracks issued and saved snapshots separately. Successful writes update the saved snapshot. Tests cover failures, retries, restart behavior, and serialized format compatibility.
Hydration gate handling `src/utils/hydrationGatedStorage.ts`, `src/stores/*Store.ts`, `__tests__/unit/utils/hydrationGatedStorage.test.ts`	Persisted selections and six stores mark hydration complete only when rehydration reports no error. Tests cover failed reads and successful retries.

Chat projection repair coverage

Layer / File(s)	Summary
Projection repair integration tests `__tests__/pro/sync/chatProjectionRepair.integration.test.ts`	Integration tests cover repair after relaunch, repeated repair, concurrent deletion, narrator-message exclusion, and repair scoped to one conversation.

Known-device reconnect state

Layer / File(s)	Summary
Reconnect message integration test `__tests__/pro/sync/KnownDevicesSection.integration.test.tsx`	The test checks that a reconnect failure message disappears after the device reports a connected, on-network state.

Android storage cap

Layer / File(s)	Summary
AsyncStorage database limit `android/gradle.properties`	The configuration sets `AsyncStorage_db_size_in_MB` to `64` and documents the default and configured limits.

Pro subproject reference

Layer / File(s)	Summary
Pro commit reference `pro`	The subproject reference changes to commit `28b7ef69ecc21b1c85a4d0b92fde91bcd84b9ae1`.

Priority: ➖ Normal

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

Change: Bug fix

Suggested reviewers: siddwednesday

Sequence Diagram(s)

sequenceDiagram
  participant RagDatabase
  participant SQLite
  participant DocumentVectorCache
  RagDatabase->>SQLite: Select embedding IDs by project
  RagDatabase->>DocumentVectorCache: Check cached document IDs
  alt Cache matches
    DocumentVectorCache-->>RagDatabase: Return cached vectors
  else Cache miss
    RagDatabase->>SQLite: Load vectors by document and ID
    SQLite-->>RagDatabase: Return embedding rows
    RagDatabase->>DocumentVectorCache: Store vectors when IDs match
  end
  RagDatabase->>RagDatabase: Align vectors to requested IDs

Merge Risk: ⚪ Minimal · up to 0db0f

No concrete merge-blocking issue was found in the supplied changes. The pro submodule commit could not be verified because the remote was inaccessible, so confirm that CI can fetch it.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 15 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly summarizes the primary storage-safety and RAG performance changes. It is concise and relevant.
Description check		The description provides detailed scope, implementation context, compatibility information, verification results, and known failures. It does not use all template headings, and it omits explicit Type …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 15 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/services/rag/database.ts:
- Around line 253-254: Update the typed-array view branch in the vector
conversion logic to construct the Float32Array using the view’s byteOffset and
byteLength, rather than reading the entire backing buffer. Handle unaligned
offsets or byte lengths that are not multiples of four without throwing, while
preserving the view’s data and length.

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__tests__/integration/rag/embeddingFlow.test.ts
__tests__/integration/rag/embeddingVectorCache.test.ts
__tests__/pro/sync/chatProjectionRepair.integration.test.ts
__tests__/unit/services/rag/database.test.ts
__tests__/unit/utils/hydrationGatedStorage.test.ts
android/gradle.properties
pro
src/services/rag/database.ts
src/services/rag/vectorMath.ts
src/stores/appStore.ts
src/stores/authStore.ts
src/stores/chatStore.ts
src/stores/projectStore.ts
src/stores/remoteServerStore.ts
src/stores/whisperStore.ts
src/utils/hydrationGatedStorage.ts

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A typed-array BLOB can be a view into a larger (pooled) buffer; decoding blob.buffer read the wrong values and length, and the vector cache would keep them. Read byteOffset/byteLength, copying when the offset is unaligned. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016JzAmMBhYRz9FHP1r3mEVr

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/services/rag/database.ts:
- Line 262: Update the BLOB-to-Float32Array conversion so slices with a backing
buffer larger than the decoded slice are copied into a right-sized buffer before
caching; keep the zero-copy view for buffers that are already right-sized, and
preserve the existing offset and length decoding behavior.

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__tests__/unit/services/rag/database.test.ts
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…ytes A zero-copy view of a slice kept the whole pooled buffer alive while the vector cache counted only the slice, so the 16 MB bound could be exceeded. Keep zero-copy only when the BLOB owns its whole buffer. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016JzAmMBhYRz9FHP1r3mEVr

Pins mobile-pro with the fix and covers it in the Known Devices integration test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016JzAmMBhYRz9FHP1r3mEVr

sonarqubecloud · 2026-10-14T15:32:41Z

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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claude added 2 commits October 14, 2026 14:52

fix(sync): drop a failed-reconnect message once the device connects

0db0f8a

Pins mobile-pro with the fix and covers it in the Known Devices integration test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016JzAmMBhYRz9FHP1r3mEVr

alichherawalla merged commit f4b85e1 into main Oct 14, 2026
7 checks passed

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perf(mobile): keep chat history safe on failed loads, index and cache RAG vectors - #718

perf(mobile): keep chat history safe on failed loads, index and cache RAG vectors#718
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Storage safety

RAG

Pro (submodule)

Compatibility

Verification (local)

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