Owen Lin 4ef836f883 Distinguish rollout IDs from thread IDs (#38127) ...

## Why

`thread/revert` preserves a thread ID while creating a new immutable rollout. Rollout persistence and filesystem fallback therefore need to distinguish the logical thread from each physical history file.

## What changed

- Add a `RolloutId` alias and canonical filename parsing for both ordinary rollouts and reverted rollouts with a distinct rollout ID.
- Allow the recorder to create a replacement rollout without changing the thread ID, and add lookup by either the stable thread ID or an exact rollout ID.
- Index history references and compression safety checks by rollout ID so multiple rollouts for one thread remain distinct.
- Preserve the rollout path selected in SQLite when filesystem repair encounters another rollout for the same thread.

## Testing

Add coverage for filename round trips, replacement rollout metadata, thread and rollout lookup, reference indexing, compression, and database path preservation.

GitOrigin-RevId: 14b1d0b4a9432b341a1307afc0abadd507e7ae7d

2026-08-12 05:20:32 +00:00

..

src

Distinguish rollout IDs from thread IDs (#38127)

2026-08-12 05:20:32 +00:00

BUILD.bazel

Extract rollout into its own crate (#15548)

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

Cargo.toml

Extract persisted history types into a dedicated crate (#37871)

2026-08-10 19:26:52 +00:00