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fix(server): bound thread history when runs start from notifications - #17441
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October 9, 2026 10:35
A PR watch or task wake starts its run with the user message rewritten into a notification item, so the history window did not count it as a turn. A thread woken mostly this way never reached the 150-turn cap, and its bounded snapshot returned every row from the 12th-newest user turn on: the whole thread. Count notification items as turn starts, in the SQL window (from the newest runs, found by run ID) and in the in-memory paging helpers. Fixes pingdotgg#17433
appendSteeringMessage can steer a notification into a running turn. That one is not a turn start; counting it could start a history page mid-turn. The SQL window now requires the notification on its run's root node, and the in-memory paths require the previous row to belong to another run.
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThread history windows now count the first notification in a run as a turn start. SQL snapshot selection adds notification anchors, and paging and in-memory snapshot windows use the same turn-start detection. Tests cover bounded windows and reconstruction of complete timelines. ChangesNotification-aware thread history windows
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change bounds thread history windows for runs that start from notifications, using the same turn-start rule in the SQL and in-memory paths. No actionable merge-blocking risk is evident. Architecture SummaryArchitecture risk: 🟡 Medium · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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Review comments at @apps/server/src/orchestration-v2/ProjectionStore.ts:
- Around line 2783-2827: Update isThreadHistoryTurnStart to count notifications
on the run’s root node even when a same-run handoff immediately precedes them;
exclude only notifications not on the root node. Keep its rule aligned with the
root-node check in the wake_anchors CTE so snapshot and older-page paging count
notification-started runs consistently toward the 150-turn limit.
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apps/server/src/orchestration-v2/ProjectionStore.test.tsapps/server/src/orchestration-v2/ProjectionStore.tsapps/server/src/orchestration-v2/threadHistoryPaging.test.tsapps/server/src/orchestration-v2/threadHistoryPaging.ts
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…input Review found two holes in the previous rule. A row of the same run (a handoff, a subagent) can come before the starting notification, so "the previous row is from another run" missed those turns. And appendSteeringMessage puts a steered message on the run's root node too, so the root-node check counted steered notifications. Both paths now count a notification when no earlier user message or notification of its run exists: threadHistoryTurnStarts in memory, a NOT EXISTS probe on run_ordinal_idx in SQL.
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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a focused server-side fix that restores the existing bounded-history policy for notification-started runs, with no schema, deployment, security, billing, or default changes. Regression tests cover both SQL window selection and in-memory paging behavior. You can add or adjust custom eligibility rules. Learn more. |
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Problem
A thread that is mostly woken by notifications (PR watch, task completion) gets no bounded first load. A notification-started run never counts as a turn start, so the 150-turn cap never trips. The window then starts at the 12th-newest user turn and
LIMIT -1returns everything after it. On a real thread with 3,896 runs,GET /api/orchestration/threads/:id/boundedreturned 20,035 rows (61 MB). The server stopped answering for about 3 s on every load, and a client that had the thread open reconnected and loaded it again. Fixes #17433.Change
Count a notification that starts its run as a turn start, with one rule in every place the window counts turns: a notification is a turn start when no earlier
user_messageornotificationof its run exists.readCanonicalProjection): a newwake_anchorsCTE checks notification items in the newestTHREAD_HISTORY_MAX_RAW_TURNS + 2runs (at or before the anchor's run). ANOT EXISTSprobe onrun_ordinal_idxrules out any notification that has an earlier input in its run.turn_anchorsis the newest 152 of user-message anchors and wake anchors together. A run starts one turn, so runs older than the newest 152 cannot change the cap. That keeps the lookup to a few index probes per run and needs no new index or migration.CROSS JOINkeeps the runs as the outer loop. With a plain join, SQLite walked every turn item in the thread and rescanned the runs for each one (the CTE alone: 3.2 s on the thread above, 3 ms withCROSS JOIN).threadHistoryTurnStartshelper applies the same rule.selectOlderTimelinePageandlayerMemory.getThreadSnapshotWindowboth use it.appendSteeringMessagesteers into a running turn. It follows the run's first input. It sits on the run's root node too, so the root node alone does not tell the two apart.User-turn windows and the row budget are unchanged.
Scope and approval
#17433 is triaged as a bug. The triage comment confirms the cause and lists "Count notification-rooted runs as turn starts" as fix 1. It also raises two caveats, and this PR addresses both:
user_message. The wake anchors come through the runs index andrun_ordinal_idxinstead, so there is no migration.appendSteeringMessageis the exception, and it is excluded as described above.One problem: the window's turn count. Fix 2 from the triage (a row or byte ceiling when user anchors exist) is a separate policy change and is not in this PR.
Verification
Focused tests, all run with
vp test run:threadHistoryPaging.test.ts: "counts notification-started turns toward the 150-turn ceiling". This is 161 runs, each a row of the run, the starting notification, a steered notification and another row. The first window starts at the starting notification of the 150th-newest run (599 rows), and the older page restores the full timeline.ProjectionStore.test.ts: "caps a SQL window by runs that a notification started". This is 12 user turns, then 400 wake runs with a user turn every 50 runs. Every run has a row before its first input and a notification steered onto its root node. The first window starts exactly at the first input of the 152nd-newest run, every older page stays bounded, and paging back restores every row in order. It also asserts the plan reads each run's items by run ID (run_ordinal_idx (run_id=? AND ordinal<?)). That assertion fails with a plainJOIN.mainand on this PR's earlier root-node rule, and pass with this change. The 7 test files that cover this window (123 tests) pass.vp lint,vp fmt --checkandvp run --filter t3 typecheckare clean.End to end on a real database: I ran a 4.2 GB
statev2.sqlitecopy in a sandbox (read-only filesystem except the copy, no network). Each build was built from source and served from that copy. A client loaded each thread 4 times the way the web and mobile clients do. "Unresponsive" is the longest wait of a 50 ms HTTP probe during the load, and "stalls" is theevent loop stalledcount inserve.log.main43f8a8d/boundedsubscribeThread/boundedsubscribeThread/boundedsubscribeThreadThe new CTE alone takes 3-7 ms per thread on that database.
Not checked: desktop and mobile clients (the change is server-side, and the bounded response shape is unchanged), and Windows.
Claude Opus 5.5 in Claude Code did this work.