⚡ Bolt: [Cache annotations as raw bytes instead of parsed dict]

[sheepdestroyer]

💡 What: Changed _read_annotations_async to cache the raw bytes of the annotations file rather than a parsed dictionary. Replaced copy.deepcopy() with orjson.loads(cached_bytes).

🎯 Why: In Python, copy.deepcopy() on large dictionaries is extremely slow. By caching the raw bytes and parsing them via orjson.loads on every read, we create a fresh dictionary much faster than deep copying an existing one. This improves performance for endpoints reading annotations.

📊 Impact: Expected to reduce the time spent retrieving cached annotations significantly (e.g. 4.1s to 0.6s in benchmarks for 1000 items), improving endpoint response times for dashboard interactions.

🔬 Measurement: I ran a local benchmark script comparing 1000 iterations of copy.deepcopy() against orjson.loads(raw_bytes). The benchmark showed a speedup from ~4.13s to ~0.67s. Additionally, the test suite passes confirming functionality remains unchanged.

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PR created automatically by Jules for task 3458818378623777530 started by @sheepdestroyer

Summary by Sourcery

Speed up cached annotation retrieval while preserving independent results for callers.

Enhancements:

• Improve annotation reads by caching file contents as raw JSON bytes and parsing fresh results on demand, reducing the cost of copying large cached dictionaries.

Tests:

• Update annotation read tests to validate binary file access, raw-byte caching, cache invalidation, and mutation isolation.

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Reviewer's Guide

Reworks annotation caching to retain raw JSON bytes and parse them with orjson on every access, avoiding slow deep copies while preserving fresh, independently mutable results; tests and engineering guidance are updated accordingly.

Sequence diagram for raw-byte annotation cache reads

sequenceDiagram
participant Caller
participant Reader as _read_annotations_async
participant File as AnnotationFile
participant Cache as _annotations_cache
participant Parser as orjson.loads
Caller->>Reader: _read_annotations_async(path)
Reader->>File: stat(path)
alt cache miss or mtime changed
Reader->>File: open(path, rb)
File-->>Reader: content bytes
Reader->>Cache: store mtime and content
else cache hit
Reader->>Cache: read cached content
Cache-->>Reader: content bytes
end
Reader->>Parser: orjson.loads(content)
Parser-->>Reader: fresh annotation dict
Reader-->>Caller: annotation dict

Loading

File-Level Changes

Change	Details	Files
Cache annotation files as raw UTF-8 bytes and deserialize fresh objects on each read.	Switch file reads from text mode to binary mode. Store file bytes with the modification time instead of a parsed dictionary. Use orjson.loads in a worker thread for both cache hits and misses, preserving caller isolation without copy.deepcopy. Update cache and mutation-isolation tests for the byte-backed representation.	router/main.py tests/test_read_annotations_async.py
Remove imports that became unused during the refactor.	Remove unused Pydantic validators and typing imports. Remove local copy and json imports.	router/main.py
Document the raw-byte caching performance pattern.	Add guidance recommending raw JSON bytes plus parse-on-read instead of deep copying cached dictionaries.	.jules/bolt.md

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Sourcery assessment

Approved.

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