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fix(server): turn starts in long threads no longer read the whole thread - #35723
The conflict item was correct. origin/main registers [87, "ProjectionProjectsCustomTitle"], and this branch had [87, "TurnStartReadIndexes"]. I merged origin/main into the branch with a merge commit, not a rebase. Main's migration keeps id 87. This fix's migration file is renamed to 088_TurnStartReadIndexes.ts and registered as [88, "TurnStartReadIndexes", Migration0088] after it. Both migration-history lists in reconcileV2PreviewMigration.test.ts now list 87 ProjectionProjectsCustomTitle then 88 TurnStartReadIndexes. The ProjectionStore comment that pairs the query predicate with the partial index now names migration 088. A database that already applied main's 87 therefore gets these indexes as 88, and main's migration still runs. The fix is otherwise unchanged: INDEXED BY for getTurnStartHistory, the partial /compact and /goal message index with keyed UNION arms, the subagent routing covering index with subagentRoutes, and the narrowed context-transfer read.
On origin/main f70e349: started the checkout's own server (node src/bin.ts serve --base-dir <fresh dir>, T3CODE_DEV_SEED=0) so it created and migrated a fresh statev2.sqlite, then stopped it. In a copy of that database, inserted two synthetic threads of 60,000 turn items each (about 8.5 items per run, synthetic payloads) and ran the exact getTurnStartHistory query with two run ids through node:sqlite (SQLite 3.54.1, no planner statistics, as the server runs). EXPLAIN QUERY PLAN: SEARCH ... USING INDEX orchestration_v2_projection_turn_items_thread_ordinal_idx (thread_id=?), so run_id is tested on every item of the thread: 12 rows in 60-70 ms. With INDEXED BY orchestration_v2_projection_turn_items_thread_run_idx, the plan is (thread_id=? AND run_id=?) plus a temp B-tree sort: the same 12 rows in 0.05-0.15 ms. The cost grows with thread length and row size, which fits the reporter's 9.7-11.5 s on a 49 GB database. Added a plan assertion to the existing ProjectionStore.test.ts case 'reads a run's turn-start items by thread and run, not by walking thread history' (10,000-item history). It fails on main; with the one-line INDEXED BY fix it passes. I did not time part 2 (getTurnStartContext over-reading messages, subagents and context transfers); it rests on the code and the reporter's measurements.
Evidence
Being captured: before and after in the real app. This section is filled in before the pull request can merge.
Tests
vp test run on persistence/reconcileV2PreviewMigration.test.ts, persistence/Migrations/087_ProjectionProjectsCustomTitle.test.ts, orchestration-v2/ProjectionStore.test.ts, TurnStartReads.test.ts and ProviderTurnStartService.test.ts: 5 files, 117 tests passed. vp run check:changed after the merge commit: format, lint, knip 1/2 and 2/2, graphql, typecheck (3 packages) and tests (6 files) all pass.
Not in this change
getTurnStartContext's messages query still runs json_extract/trim over every user message of the thread to find /compact and /goal turns (and the hasConversation EXISTS does the same). Making that indexed needs a generated column or index migration.
getTurnStartContext still decodes full subagent payloads although only childThreadId/providerThreadId are used. Returning just routing ids would change the store's contract and its test mocks.
getTurnStartContext still reads every run, attempt, provider thread, provider turn and context handoff of the thread.
The hasConversation EXISTS still evaluates json_extract per user message until it finds the first non-/compact one; in practice it stops at the first ordinary message, so it was left as is.
RunExecutionService.canRouteRelatedSubagent is now used only by its own test; the store's SQL encodes the same 'completed' rule. I didn't remove the export.
getTurnStartContext still reads every run, attempt and provider turn of the thread; the issue itself leaves these because the consumers aggregate over the whole provider thread.
The hasConversation EXISTS still checks user messages one by one until the first ordinary one.
RunExecutionService.canRouteRelatedSubagent is now used only by its test.
getTurnStartContext still reads every run, attempt and provider turn of the thread, as the issue itself leaves.
Who did the work
Written by Claude Opus 5.5, in Claude Code
Reviewed by GPT-6.1 Sol, in Codex, and by Claude Opus 5.5, each on its own
Proof captured by GPT-6.1 Sol and checked by Claude Opus 5.5
…n index
Reproduces #35597: getTurnStartHistory with run ids walks every turn item
of the thread through thread_ordinal_idx.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A retry handoff's history read for a few runs ordered by ordinal, so without
planner statistics SQLite walked the thread's ordinal index and tested run_id
on every item. It now uses the thread/run index. The turn-start context also
read every non-failed subagent and every context transfer touching the thread;
it now reads only the completed subagents turn start routes, forks into the
thread, and transfers the thread's handoffs reference.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ndex
getTurnStartContext still parsed every user message of the thread to find
/compact and /goal turns, and decoded every completed subagent's payload
though turn start only routes by its child and provider thread ids.
A partial index now holds exactly the /compact and /goal user messages, and
the message read is split so each arm uses its own index: the run's message
by key, the commands through the partial index. A covering index on the
subagent routing columns lets the context return just those ids.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Main took migration 87 (ProjectionProjectsCustomTitle); the turn-start read
indexes move to 88.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR approvable — This change reduces turn-start database work through targeted queries and new indexes while preserving completed-subagent routing. The migration adds indexes without rewriting conversation data, and no material product or access-policy change is apparent.
No code changes detected at 8feb821. Prior analysis still applies.
You can add or adjust custom eligibility rules. Learn more.
Turn-start history reads use a run-scoped index when run IDs are provided. Context reads select matching command messages, completed-subagent routes, and transfers linked to the thread’s handoffs or forks. Provider turn startup uses the returned routes to build related thread IDs.
Migration 90 adds message and subagent routing indexes. Turn-start command matching uses a whitespace-aware predicate, and history reads with run IDs use the thread/run index. Tests cover query plans and migration registration.
The context result contains routes for completed subagents. Context reads select matching command messages, fork transfers targeting the thread, and transfers referenced by its handoffs. Tests verify transfer selection and conversation history.
Root-run related thread IDs apps/server/src/orchestration-v2/ProviderTurnStartService.ts, apps/server/src/orchestration-v2/ProviderTurnStartService.test.ts
startRootRun builds related thread and provider-thread IDs from subagentRoutes, omitting null IDs. Test contexts include an empty route list.
This change narrows turn-start store reads and adds supporting indexes so long threads start turns faster. No concrete merge-blocking defect was found, and the migration order and tests are consistent.
Pre-merge checks: 2 · 1 · 1
Failed checks: 1 warning · 1 inconclusive
Check name
Status
Explanation
Resolution
Description check
The description follows the template's section order: Problem, Change, Scope, Verification, and a note on who did the work. It explains the reproduction and the migration renumbering, and it links the…
Resolve the migration number conflict. The PR comments say main already uses 088, so the migration may need to move to 089. Update the description to match the final number. Fill in the Evidence section with the before and after captures, o…
Out of Scope Changes check
Changes that match the issue are present at head: ProjectionStore.ts turn-start reads and subagentRoutes shape; ProviderTurnStartService.ts and its test consuming subagentRoutes; TurnStartReads.test.t…
Inspect the whole-PR diff from merge base f5ae808 to head 8feb821 for apps/server/src/orchestration-v2/ProjectionStore.ts. Confirm that the thread.visit-recorded, listActiveT…
Passed checks: 2 passed
Check name
Status
Explanation
Title check
The title names the main change: turn starts in long threads no longer read the whole thread. The changeset adds an INDEXED BY hint to getTurnStartHistory, adds indexes for /compact and /goal messages…
Linked Issues check
Issue #35597 is the only direct linked issue. It is open and has coding requirements only. Two requirements apply.
(1) getTurnStartHistory with runIds [#35597]: ProjectionStore.ts forces INDEXED BY o…
Full details: Title check
Explanation
The title names the main change: turn starts in long threads no longer read the whole thread. The changeset adds an INDEXED BY hint to getTurnStartHistory, adds indexes for /compact and /goal messages and subagent routing, and narrows the context-transfer read. The title follows the conventional commit format the template suggests. It is a short single sentence.
Full details: Linked Issues check
Explanation
Issue #35597 is the only direct linked issue. It is open and has coding requirements only. Two requirements apply.
(1) getTurnStartHistory with runIds [#35597]: ProjectionStore.ts forces INDEXED BY orchestration_v2_projection_turn_items_thread_run_idx when run IDs are given. The incremental diff from the previous reviewed head does not change this path. ProjectionStore.test.ts asserts the query plan. The PR reports that this assertion fails on main and passes with the hint.
(2) getTurnStartContext narrowing [#35597]: The head (a) adds a partial index for user /compact and /goal messages and uses keyed UNION arms; (b) adds a covering index on (thread_id, status, subagent_id, child_thread_id, provider_thread_id) and returns subagentRoutes, which ProviderTurnStartService.ts consumes; (c) narrows context transfers to fork transfers into the thread and transfers referenced by ready handoffs. TurnStartReads.test.ts covers the transfer narrowing.
The issue leaves full reads of runs, attempts and provider turns in place. The PR also leaves them. getRuntimeRecoveryProjection is not a named fix in the issue. Timing for part 2 is not measured in the PR, so the sub-second result for getTurnStartContext is unconfirmed by measurement. This does not change the verdict, because the coding requirements are implemented and tested.
Migration numbering: the PR description says the indexes are registered as migration 088. At head, Migrations.ts is unchanged since the previous review and registers the indexes as 090_TurnStartReadIndexes after 089. The file 088_TurnItemTypeStatusIndex.ts already exists. The description is stale. Migration numbering is not a coding requirement of the issue, so it does not change this verdict.
Full details: Description check
Explanation
The description follows the template's section order: Problem, Change, Scope, Verification, and a note on who did the work. It explains the reproduction and the migration renumbering, and it links the issue (#35597). Several gaps remain. The Problem section has no standalone statement of expected behavior. The Scope section links the issue but does not say why the fix needs no issue. The Evidence section says before and after captures are pending and that the section must be filled before merge. The 'Not in this change' list repeats several bullets. The author also says migration 088 was chosen, while the PR comments say main already took 088, so the migration number is in dispute.
Resolution
Resolve the migration number conflict. The PR comments say main already uses 088, so the migration may need to move to 089. Update the description to match the final number. Fill in the Evidence section with the before and after captures, or state why they are not needed. Remove the duplicated bullets in 'Not in this change'. State the expected behavior in the Problem section.
Full details: Out of Scope Changes check
Explanation
Changes that match the issue are present at head: ProjectionStore.ts turn-start reads and subagentRoutes shape; ProviderTurnStartService.ts and its test consuming subagentRoutes; TurnStartReads.test.ts; ProjectionStore.test.ts; Migrations.ts, reconcileV2PreviewMigration.test.ts and 090_TurnStartReadIndexes.ts. These map to the issue's two fixes and their tests.
The incremental diff of ProjectionStore.ts from the previous reviewed head contains hunks that do not match the issue or the PR description. These are: thread.visit-recorded handling and applyOrchestrationV2ThreadVisit; a new listActiveThreads query and ActiveThreadListEntry type; a shellIndexLineage helper; and extra send_to_user and sentMessage predicates in inlineWorkOutput. The whole-PR summary does not list these hunks. They may come from the origin/main merge commit, which the PR description reports. This review did not inspect the whole-PR diff against the merge base f5ae808 for these hunks, so their origin is unknown.
RunExecutionService.canRouteRelatedSubagent is now used only by its test. This is leftover code, not an unrelated change.
Resolution
Inspect the whole-PR diff from merge base f5ae808 to head 8feb821 for apps/server/src/orchestration-v2/ProjectionStore.ts. Confirm that the thread.visit-recorded, listActiveThreads, shellIndexLineage and inlineWorkOutput send_to_user/sentMessage hunks come from origin/main and are not authored by this PR. If they are authored by this PR, remove them or link them to an issue that requires them. Also correct the PR description's migration number (088 or 090) to match the registered migration.
Finishing Touches
Generate unit tests (beta)
Commit to this branch
Create a new PR
Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
The automated pipeline stopped on this pull request and will not merge it:
the capture step could not show the problem on the base commit, so there is nothing to prove fixed.
On each commit, create a fresh server database and project. Generate one seed run containing 6,666 assistant messages of approximately 32 KiB and 53,328 completed synthetic tool calls through real provider notifications, producing 59,998 turn items. Run three warm-up probes, stop and restart the server, then record three identical sequential message sends. Both recorded sides begin with 60,007 items, 6,674 messages and four runs. Measure provider receipt and existing server trace spans. Inspect recordings and stills; verify each final still matches another capture 500 ms later. Upload evidence and scripts, stop all servers, and remove both worktrees and scratch data.
Measured this PR on the database from #35597, since the capture could not show the problem on a fresh one.
Setup: a block clone of our 49 GB statev2.sqlite, with the two threads from the issue, now at 7,352 and 6,886 runs. I read through the real ProjectionStore (reader worker, node:sqlite), read-only, with the same harness as in the issue. Base is this PR's merge base, 587deab7d3. Head is 6df7b02353, with migration 088's two indexes created on the clone; those took 38 s and 4 s. The base was run again after the head, so both sides below had a warm cache. Each side ran two passes.
Read
Base, A / B
Head, A / B
getTurnStartHistory(threadId, runIds)
9.1–12.1 / 9.0–12.6 s
2 / 6–7 ms
getTurnStartContext
8.5–9.6 / 7.0–7.8 s
4.5–4.7 / 4.6–4.9 s
These two reads of a queued start drop from 16–22 s to under 5 s. On thread A, what remains in getTurnStartContext is the full runs, attempts and provider-turn reads, 1.1–1.2 s each, and context transfers at 0.8 s.
Why the capture likely missed it:
getTurnStartHistory with run ids runs from prepareRetryHandoff. Our queued starts behind an active run reach it; three sequential sends to an idle thread may not.
getTurnStartContext grows with runs, attempts, provider turns, subagents and transfers. The seed had four runs and no subagents.
One read from #35597 that this PR does not cover: getRuntimeRecoveryProjection. In the same runs as above it took 3.1–3.3 s on thread A and 1.6 s on thread B, on both base and head. A turn start calls it twice, once in provider start and once in startRootRun. In production that was 202 times each in 8.6 hours. Since this PR closes #35597, could that read stay tracked, here or in a new issue?
Measured and written by Claude (Opus 5.5) in T3 Code; posted with the owner's approval.
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Failed pre-merge checks:
- Description check:
Resolve the migration number conflict. The PR comments say main already uses
088, so the migration may need to move to 089. Update the description to match
the final number. Fill in the Evidence section with the before and after
captures, or state why they are not needed. Remove the duplicated bullets in
'Not in this change'. State the expected behavior in the Problem section.
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The conflict item was correct. origin/main registers [87, "ProjectionProjectsCustomTitle"], and this branch had [87, "TurnStartReadIndexes"]. I merged origin/main into the branch with a merge commit, not a rebase. Main's migration keeps id 87. This fix's migration file is renamed to 088_TurnStartReadIndexes.ts and registered as [88, "TurnStartReadIndexes", Migration0088] after it. Both migration-history lists in reconcileV2PreviewMigration.test.ts now list 87 ProjectionProjectsCustomTitle then 88 TurnStartReadIndexes. The ProjectionStore comment that pairs the query predicate with the partial index now names migration 088. A database that already applied main's 87 therefore gets these indexes as 88, and main's migration still runs. The fix is otherwise unchanged: INDEXED BY for getTurnStartHistory, the partial /compact and /goal message index with keyed UNION arms, the subagent routing covering index with subagentRoutes, and the narrowed context-transfer read.
Fixes #35597
Reproduction on main
On origin/main f70e349: started the checkout's own server (
node src/bin.ts serve --base-dir <fresh dir>, T3CODE_DEV_SEED=0) so it created and migrated a fresh statev2.sqlite, then stopped it. In a copy of that database, inserted two synthetic threads of 60,000 turn items each (about 8.5 items per run, synthetic payloads) and ran the exact getTurnStartHistory query with two run ids through node:sqlite (SQLite 3.54.1, no planner statistics, as the server runs). EXPLAIN QUERY PLAN:SEARCH ... USING INDEX orchestration_v2_projection_turn_items_thread_ordinal_idx (thread_id=?), so run_id is tested on every item of the thread: 12 rows in 60-70 ms. WithINDEXED BY orchestration_v2_projection_turn_items_thread_run_idx, the plan is(thread_id=? AND run_id=?)plus a temp B-tree sort: the same 12 rows in 0.05-0.15 ms. The cost grows with thread length and row size, which fits the reporter's 9.7-11.5 s on a 49 GB database. Added a plan assertion to the existing ProjectionStore.test.ts case 'reads a run's turn-start items by thread and run, not by walking thread history' (10,000-item history). It fails on main; with the one-line INDEXED BY fix it passes. I did not time part 2 (getTurnStartContext over-reading messages, subagents and context transfers); it rests on the code and the reporter's measurements.Evidence
Being captured: before and after in the real app. This section is filled in before the pull request can merge.
Tests
vp test run on persistence/reconcileV2PreviewMigration.test.ts, persistence/Migrations/087_ProjectionProjectsCustomTitle.test.ts, orchestration-v2/ProjectionStore.test.ts, TurnStartReads.test.ts and ProviderTurnStartService.test.ts: 5 files, 117 tests passed. vp run check:changed after the merge commit: format, lint, knip 1/2 and 2/2, graphql, typecheck (3 packages) and tests (6 files) all pass.
Not in this change
Who did the work
Run by the t3code factory in T3 Code.