DottaandClaude Opus 5.5 7adb78d811 perf(heartbeat): retry a preparation a restart interrupted at once (#20255) ...

## Thinking Path

- Restart recovery should resume interrupted work quickly. #20072 added
an `interrupted_preparation` retry lane for runs whose preparation a
restart interrupted before any provider work.
- Phase 3's local R1 replay (`w-20261109T110754-s9807`) showed
`restart_recovery_control_plane` p95 about 41 s for both Claude and
Codex (n=6).
- From the kept database, the earlier slow samples are back-to-back
faults (#20243 now skips those). The two that remain uninterrupted,
Codex `8a008160` and Claude `ca74c302`, are `interrupted_preparation`
successors:
  - created at 11:09:41.7–41.8, as f03 recovered;
  - `scheduled_retry_at` 26.3 s and 34.2 s later;
  - claimed 18.5 s and 26.5 s after f04 was ready.
- The lane reused the transient-failure backoff (30 s, then 60 s,
jittered). A restart isn't a transient fault, so the successor shouldn't
wait.

## Linked Issues or Issue Description

Refs #20072

**What happened?**
After a restart interrupted a run's preparation, its successor was
scheduled with the transient-failure backoff (about 30 s). Recovery took
about 40–50 s instead of a few seconds.

**Steps to reproduce**
1. Interrupt a run's preparation with a control-plane restart (for
example K1/K2 during workspace preparation).
2. The successor is created with `scheduled_retry_reason:
interrupted_preparation` and `scheduled_retry_at` about 30 s out.

**Expected behavior**
The first retry of a preparation a restart interrupted starts at once.
Backoff applies only if it keeps being interrupted.

## What Changed

- `server/src/services/heartbeat/retries.ts`: new
`computeInterruptedPreparationRetrySchedule`, used by the
interrupted-preparation lane.
  - Attempt 1 is due immediately (delay 0).
- Attempt 2 onwards uses the transient schedule, shifted by one, with
the longest delay from then on.
- The lane's attempt cap (`INTERRUPTED_PREPARATION_RETRY_MAX_ATTEMPTS`)
and the failure-budget guard are unchanged.
- `retries.test.ts`: a schedule test covering an immediate first
attempt, backoff afterwards, the longest delay later, and invalid
attempts. It's red on master.

## Verification

- `retries.test.ts`: 24 passed.
- `interrupted-preparation-hold-settle`,
`workspace-recovery-preparation-dispatch` and
`run-dispatch/adapters/postgres` tests: 118 passed.
- `heartbeat-process-recovery.test.ts` filtered to interrupt, prepare
and retry cases: 59 passed and 1 failed. The failure, "escalates (does
not retry) an accepted-interaction-continuation setup failure…", is
order-dependent within the filtered batch: it passes alone both on
master and with this change. The unfiltered file exceeds the local
timeout; CI runs it.

## Risks

- **A preparation that itself crashes the server** now retries once
immediately before backing off. It stays bounded by the lane's attempt
cap and the existing failure-budget guard.
- **No change** to transient-failure retries or to other lanes.

## Model Used

Claude Opus 5.5 (`claude-opus-5-5`, Anthropic), 1M context window, tool
use and code execution, via Claude Code.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-09 06:22:06 -06:00

..

scripts

Add a versioned online workspace migration command (#19882)

2026-11-07 13:20:35 -06:00

src

perf(heartbeat): retry a preparation a restart interrupted at once (#20255)

2026-11-09 06:22:06 -06:00

test-baselines

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CHANGELOG.md

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package.json

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tsconfig.json

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vitest.backup-qualification.config.ts

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vitest.config.ts

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