fix(server): worktree cleanup no longer runs sweeps back to back

[t3dotgg]

Problem

With Delete worktrees with deleted threads on, every provider session update and every thread deletion queued another full worktree cleanup sweep. Most of these updates are a turn starting, which can never free a worktree. The queue never merged requests, so sweeps ran back to back. Each sweep also read the full thread snapshot 2 + 4N times for N eligible worktrees. On large databases these reads stall the server, and clients disconnect. Traces are in #17479.

Change

• At most one automatic sweep waits at a time. The hourly run, settings changes and events all request it, and later requests join it. Manual runs still get their own sweep and report.
• Only session updates that reach "stopped" or "error", and deleted threads, request a sweep.
• The recheck under each worktree's lease no longer reads a full snapshot. It reads which threads use the path (new ProjectionStoreV2.getThreadWorktreePaths, one query on the threads table) and the shell of that one thread.
• Each sweep reads the active snapshot once. The second "archive" read is gone: its threads list was always empty, because the snapshot puts archived threads in archivedThreads. The new path query also skips archived threads, so the recheck sees the same threads as the first check.
• That one snapshot read runs on the SQLite reader worker (NodeSqliteClient.readOnly), not on the main connection, so it no longer blocks the event loop. On a 3.8 GB database it froze the server for about 2 s per sweep. This replaces fix(server): hourly storage cleanup no longer freezes the server on large databases #19421. The recheck under each worktree's lease still reads from the main connection, so it sees the latest state.

Cleanup keeps and removes the same worktrees as before, with the same reasons.

Scope and approval

Fixes #17479. This takes over #17480 by @fireboltdude1357. Their commit is kept as is, and my follow-ups are separate commits. Changes from #17480:

• The path query skips archived threads. In fix(server): worktree cleanup no longer runs sweeps back to back #17480 it counted them, so a worktree shared with an archived thread was kept on every sweep with the reason "Thread activity or shared worktree changed since check".
• The unused archive snapshot read is removed.
• The new tests use the existing storageCleanup.test.ts fixture instead of a second 415-line test file.
• The snapshot read runs on the reader worker, from fix(server): hourly storage cleanup no longer freezes the server on large databases #19421.

Server only. No contract, client or setting changes. Left as is: archived threads are never cleanup candidates (#16473), cleanup's session check treats "error" sessions as live, and per-worktree Git cost (#17814).

Verification

vp test run apps/server/src/storageCleanup.test.ts apps/server/src/orchestration-v2/ProjectionStore.test.ts apps/server/src/orchestration-v2/ProviderTurnControlService.test.ts: 98 passed. The new tests run the real StorageCleanup.layer with faked stores. With main's storageCleanup.ts they fail:

Case	main	this PR
20 "running"/"ready" updates during a sweep	21 sweeps, 46 snapshot reads	1 sweep, 1 read
20 "stopped"/"error" updates during a sweep	21 sweeps, 46 snapshot reads	2 sweeps, 2 reads
One sweep, one eligible worktree	6 snapshot reads	1 read

A ProjectionStore test checks that getThreadWorktreePaths skips deleted and archived threads on the SQL and memory layers. On a read-only copy of a real database, the new query returned exactly the active snapshot's threads that have a worktree path. Server typecheck, lint and format are clean.

Reader worker proof: on a file database with the reader worker on, while another transaction held the main connection for 2 s, the cleanup snapshot read finished in 0.00 s. The same read without readOnly waited 2.00 s.

Not verified: timings on a large database with this build. That copy has 21 threads, too few to time. The original #17480 measured the path query at 13 ms on a database with 3,765 live threads, where one full snapshot read took 7 s.

Original work by @fireboltdude1357 in #17480. Please keep this trailer in the squash commit:

Co-authored-by: Tanner Sharon tannermsharon@gmail.com

Reviewed with sol-loop: 2 rounds with GPT-6.1-Sol.

Made with Claude Opus 5.5 in Claude Code, running in T3 Code.

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This is a multi-part runtime change to automatic worktree cleanup, including new sweep coalescing and status-based gating of cleanup requests that can lead to destructive filesystem operations. The focused tests and experienced ownership reduce risk, but the scheduling and side-effect changes merit human review.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	20.9 KiB	20.9 KiB	0 B (0.0%)	29.3 KiB	✅
Codex	Live turn messages	2	2	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	−7 B (−0.1%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	−7 B (−0.6%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.2 KiB	21.2 KiB	0 B (0.0%)	29.3 KiB	✅
Claude	Live turn messages	2	2	0 (0.0%)	8	✅

Baseline: 8414d16 · PR result: edf33d8 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

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• apps/server/src/storageCleanup.ts

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📝 Walkthrough

ProjectionStoreV2 now returns worktree paths for active threads. Storage cleanup rechecks candidates using current project and thread data, reads the thread snapshot once per sweep, and coalesces automatic sweeps triggered by schedules, settings, and selected events.

Changes: Storage cleanup

Layer / File(s)	Summary
Active-thread worktree-path lookup apps/server/src/orchestration-v2/ProjectionStore.ts, apps/server/src/orchestration-v2/ProjectionStore.test.ts, apps/server/src/orchestration-v2/ProviderTurnControlService.test.ts	ProjectionStoreV2 adds getThreadWorktreePaths to its SQL and in-memory implementations. Both return paths for active, non-deleted threads with a worktree path. Tests cover filtering and update the projection-store mock.
Cleanup candidate checks apps/server/src/storageCleanup.ts, apps/server/src/storageCleanup.test.ts	Cleanup reads active thread shells and rechecks candidates using current project roots, worktree paths, and thread shells. Tests cover activity changes during measurement and verify one thread-snapshot read per sweep.
Automatic sweep scheduling apps/server/src/storageCleanup.ts, apps/server/src/storageCleanup.test.ts	Automatic requests from schedules, settings changes, and qualifying events are coalesced. Provider-session updates request sweeps only for stopped or error statuses. Tests cover updates received during an automatic sweep.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant DomainEvents
  participant StorageCleanup
  participant AutomaticSweepWorker
  DomainEvents->>StorageCleanup: provider-session.updated
  StorageCleanup->>StorageCleanup: request sweep for stopped or error status
  StorageCleanup->>AutomaticSweepWorker: enqueue if no automatic sweep is queued
  AutomaticSweepWorker->>StorageCleanup: run automatic sweep

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Suggested reviewers: juliusmarminge

Merge Risk: 🟡 Moderate · up to edf33

A cleanup sweep can remove a checkout still referenced by an archived thread, potentially deleting local files, while large databases still incur repeated path-lookup work. Resolve these risks before merging.

Pre-merge checks: 4

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		The changes satisfy the coding requirements in [#17479]. storageCleanup.ts coalesces automatic sweep requests and keeps manual runNow sweeps separate. It requests event-driven sweeps for deleted t…
Out of Scope Changes check		The changes stay within the server-side scope of [#17479]. The new projection-store method directly supports the cleanup recheck. The related tests validate the new cleanup behavior. No unrelated clie…
Title check		The title clearly identifies the main fix: preventing back-to-back server worktree cleanup sweeps. It is concise and specific.
Description check		The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains the issue, implementation, scope, linked issue, test results, limitations, and agent d…

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Actionable comments posted: 2

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Inline comments:
Review comments at @apps/server/src/storageCleanup.ts:
- Around line 549-550: Add a path-scoped lookup to the projection API and use it
in the late recheck around getThreadWorktreePaths, querying only the candidate
worktree path instead of loading all active thread paths. Preserve path
normalization and the late recheck behavior, and ensure the database lookup uses
an efficient access path.
- Line 255: Update the worktree-sharing check around getShellSnapshot so
archived threads’ paths remain included when determining whether a checkout is
shared, while excluding archived threads only from cleanup candidates. Preserve
the existing cleanup decisions for active and deleted threads.

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• apps/server/src/orchestration-v2/ProjectionStore.test.ts
• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/ProviderTurnControlService.test.ts
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• apps/server/src/storageCleanup.ts

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