Charlie Marsh 4f699cd642 Move session index I/O off async runtime threads (#49708) ...

## Why

Session index updates perform synchronous file I/O and wait on a blocking mutex inside async functions, blocking runtime threads.

## What changed

Run appends and thread-name removals in `spawn_blocking` workers. Acquire a Tokio mutex before dispatch and keep its owned guard in the worker so queued and running updates remain serialized even if the awaiting task is cancelled. Move the lookup's file-existence check into its blocking worker as well.

## Testing

Add tests for lock retention after cancellation of running and queued updates, write ordering after cancellation, and removal that preserves other thread names and malformed lines.

GitOrigin-RevId: 368745d8e5bbf24c527facc0a62ddd0fb76f0ffb

2026-09-30 18:51:29 +00:00

..

src

Move session index I/O off async runtime threads (#49708)

2026-09-30 18:51:29 +00:00

BUILD.bazel

Extract rollout into its own crate (#15548)

2026-03-24 18:10:53 -07:00

Cargo.toml

Use memrchr to find newlines in reverse JSONL scans (#49444)

2026-09-30 02:19:47 +00:00