perf(frontend): preserve search identity and isolate snapshot polling

[seonghobae]

Buyer-visible problem

Active canvas search rebuilt decorated node.data objects during high-frequency position-only updates, defeating identity-based memoization and adding avoidable allocation/GC pressure. Snapshot polling also used overlapping setInterval requests, allowing an older response or rejection to overwrite state after the user selected a newer snapshot.

Exact current head

b2eb0e8c2ff19faab3a44cd171cbae33eea96176

The fail-first test commit is bf8f6d4f27e41e5cd11a6cc3b4b1b7bdf50826db. No predecessor-head review or check is reused.

Implemented bounded repair

• cache search-decorated TableNodeData in a normalized-query-scoped WeakMap keyed by the immutable source data object;
• preserve the exact derived data reference across equivalent normalized searches and position-only updates;
• produce a fresh derived object when the query or source data identity changes;
• replace overlapping interval polling with one immediate request followed by completion-scheduled setTimeout polling;
• invalidate every snapshot, list-refresh, and error continuation on snapshot/project change and unmount;
• stop after succeeded, failed, or not_found while retaining the terminal snapshot-list refresh;
• add CHANGELOG.md and docs/doctoring/search-identity-and-sequential-polling.md with APA 7 references and monitoring/rollback guidance.

Observable regression evidence

frontend/src/App.searchPolling.test.tsx captures the payload passed to React Flow and proves exact reference identity with toBe. It drives a position-only update and a source-data replacement, reverses snapshot response order, rejects a superseded request with sensitive detail, and uses controlled timers to prove that a pending request prevents overlap, a non-terminal completion schedules exactly one later request, and a terminal response shuts polling down.

Exact-head checks

The exact current head has successful repository ci, Security Scan, SAST Semgrep, and CodeRabbit status. There are no inline review threads or submitted requested-change reviews.

Merge boundary

Merge only after every repository-required exact-head check remains successful, a qualifying independent non-author current-head approval exists, and branch protection accepts the unchanged head without bypass. Queued, cancelled, skipped-required, absent, stale-head, author-only, or status-only approval evidence is not accepted.

This clean replacement supersedes closed #693, whose accumulated 66-file branch could not support defensible review evidence.

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 72afe6d and b2eb0e8.

📒 Files selected for processing (4)

• CHANGELOG.md
• docs/doctoring/search-identity-and-sequential-polling.md
• frontend/src/App.searchPolling.test.tsx
• frontend/src/App.tsx

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