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14-comments-aggregation-index.md

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Comments indexing

Avoid repeated flatten+sort for comment aggregates

Summary

packages/app/src/context/comments.tsx derives all by flattening all file comment arrays and sorting on every change. This is simple but can become expensive with many comments. We will maintain an indexed aggregate structure incrementally.

Goals

  • Keep comments.list(file) behavior unchanged
  • Make comments.all() retrieval near O(1) for reads
  • Preserve chronological ordering guarantees

Non-goals

  • Persisting comments in a new schema
  • Adding new comment metadata fields
  • UI changes for comment display

Parallel execution contract

This spec owns:

  • packages/app/src/context/comments.tsx
  • Optional tests for comments context

This spec should not modify:

  • packages/app/src/pages/session.tsx
  • packages/ui/src/components/line-comment.tsx

Implementation plan

  1. Add aggregate index state
  • Maintain commentsByFile (existing) plus an allComments array in chronological order.
  • Keep both updated through the same mutator paths.
  1. Update mutators
  • add: append new comment to file list and aggregate list.
  • remove: remove from file list and aggregate list by id/file.
  • clear: reset both structures and focus/active state.
  1. Simplify selectors
  • list(file) reads file list directly.
  • all() returns pre-indexed aggregate list without per-read flatten+sort.

Acceptance criteria

  • comments.all() no longer flattens and sorts every reactive run.
  • Comment order stays chronological by time.
  • add/remove/clear/focus/active semantics remain unchanged.

Validation plan

  • Manual:
    • Add multiple comments across different files.
    • Remove one comment and verify both file-level and global views update correctly.
    • Submit prompt (which clears comments) and verify reset behavior.
  • Optional unit test:
    • add/remove/clear keeps aggregate ordering and integrity.

Risks and mitigations

  • Risk: aggregate list and per-file lists diverge.
    • Mitigation: funnel all writes through centralized mutators; avoid direct store writes elsewhere.
  • Risk: ID collision edge cases.
    • Mitigation: keep UUID creation unchanged and remove by file + id pair.