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DottaandPaperclip 6dcf4160dd perf(chat): load recent messages and page history on scroll (#18358)
## Thinking Path

> - Paperclip lets people manage work done by agents.
> - A standing agent chat can hold months of conversation.
> - The chat route forced full-history mode, bypassing compact task
loading.
> - A cold visit fetched lifetime run summaries and hydrated historical
transcripts.
> - This PR starts with 20 recent messages and loads earlier pages on
upward scroll.
> - It preserves the reader's position, current questions, and draft
while history grows.

## Linked Issues or Issue Description

**What happened?**

Standing agent chats forced full-history loading. A long conversation
fetched full activity and run history before it became readable. Earlier
comments also used an explicit load control.

**Expected behavior**

Open a small recent conversation quickly. Load older messages when the
reader scrolls upward. Show an inline loading state. Keep the visible
message and composer mounted through paging, live updates, and Back
navigation.

**Steps to reproduce**

1. Open a standing agent chat with hundreds of messages and completed
runs.
2. Use a fresh browser query cache.
3. Observe full activity and run reads plus transcript requests for
historical runs.
4. Compare the recent window and upward paging after this change.

Related work: #18312 and #18323 restored compact task and collection
loading. #14848 added reopening of visited agent chats. A GitHub search
found no open PR for this chat-history optimization.

## What Changed

- Return 20 contiguous recent comments for standing chats, with a stable
oldest cursor. Keep the existing compact task exchange contract. Use the
existing company/issue/time index for cursor reads.
- Keep chats compact even if their task view previously expanded
history. Retain observed messages through live catch-up and cache-backed
return visits.
- Keep fetched history pages, acknowledged sends, and the observed
recent cursor separate. Reconcile live replies without losing history
after a send or deleted cursor.
- Hydrate metadata only for newly revealed message/run IDs; preserve
prior batches while paging. Slow-send recovery refreshes the recent
window. Receipts failures have an independent retry.
- Hydrate run summaries only for loaded messages and the latest turn.
Validate batches of at most 100 run IDs and keep the existing
issue/company access rules.
- Reuse hydrated terminal native streams when only history membership
changes. Preserve retry, resume, mode changes, reconnect recovery, and
interrupted recovery reads.
- Load older messages, decision receipts, and task handoffs through
upward scrolling. Support wheel, touch, and keyboard input. Keep pending
questions visible.
- Reserve a status slot while loading. Preserve a logical message anchor
and the mounted composer. Pause failed page reads until an inline Retry.
- Add database, route, controller, and scroll regressions, plus an
opt-in production-build browser rig for long chats on desktop and
mobile. Update design and feature/access documentation.

## Verification

- The real PostgreSQL cold-open suite passes all 12 tests, including
contiguous pages with equal timestamps, complete history, company
denial, and scoped run IDs.
- Activity route and OpenAPI suites pass 53 tests. The route run allowed
local cold-import overhead; CI retains the repository's normal timeouts.
- Three new paging regressions fail against the unchanged source. The
candidate's focused paging/window suite passes 26 tests. Broader UI
verification is recorded below when complete.
- Desktop and mobile browser acceptance covers recent-only startup,
per-frame reveal geometry, delayed and failed older pages, stable
reading anchors and drafts, Back, older comment links, and one persisted
live reply.
- Full workspace typecheck and build passed locally. The final UI source
also passes its typecheck and production build.
- Affected UI suites pass: 212 controller/history/paging tests, 352
thread/scroller tests, 26 native-stream tests, plus metadata batching
and live-cache hydration coverage. The issue mutation/access route suite
passes 179 tests.
- All 22 final desktop/mobile browser journeys pass, including delayed
image growth. The isolated second-page request proof also passes six
repeated desktop/mobile runs. A separate 6,000-message, 3,000-run
fixture passes cold-open and delayed-paging checks on both screen sizes,
still opening 20 messages and loading one 50-message page.
- Final matched production timings use baseline `aa58fa1073`
(`index-BaRiMbxd.js`) and candidate UI source `f9a26b9783`
(`index-DPWTbsFF.js`, identical application source at final head
`bf71ffd5af`). Chromium 151.0.7922.34, 1440×900, 4× CPU throttle, no
added network latency, browser HTTP cache disabled, fresh application
cache for each cold visit. Both variants block service workers and use
the same warm local API server and immutable 600-message/300-run
fixture. Only document HTML is intercepted for both variants; API
requests are real. The common API revision is `109981f8c1`; subsequent
commits change only UI and tests.

| Usable conversation | Baseline median (range) | Candidate median
(range) |
| --- | --- | --- |
| Cold direct URL | 6.57 s (5.69–7.45) | 3.07 s (2.50–3.28) |
| Warm in-app return | 3.76 s (3.54–4.76) | 0.67 s (0.58–1.46) |
| Back return | 2.53 s (2.12–4.20) | 0.51 s (0.47–1.18) |

Five pairs alternate order. Every paired difference favors the candidate
for all three journeys. Readiness requires a revealed, fully visible
latest reply above the composer and an editable composer. Return timing
starts after the Tasks route renders. Cold API requests fall from
953–954 to 71; API wire bytes fall from 517–559 KB to about 49 KB.
Separate CPU profiles and request waterfalls confirm the removal of
lifetime event hydration and are excluded from the five timing pairs.
Both variants have the same expected missing optional plan document
(404) and no browser exceptions. Control recent-window API reads have
medians of 37 ms / 32 ms, with shared-host outliers up to 376 ms.

The 6,000-message recent-window SQL uses
`issue_comments_company_issue_created_at_idx` (22 index rows read for a
21-row probe). Geometry assertions retain a 2-pixel tolerance for the
reading anchor and first-reveal layout. These are local synthetic
measurements, not deployed staging latency. Earlier timing probes are
excluded because they did not isolate service workers or composer
clearance. Final head `bf71ffd5afb5684ba9105a3127f617e7adf5139c` has 55
successful checks, three optional skips and one neutral result, with no
failures or pending checks. Greptile is 5/5 with no open review
findings.

### Failure record

Early local attempts exposed an unconditional scroller wrapper that
changed the old task layout, and automatic retries on chat page
failures. Both were corrected. The original task scroller structure
stays in place. Metadata request assertions wait for initial connection
recovery to settle, then verify only the new page’s reads;
retry/resume/reconnect revalidation remains intentional.

The initial review caught a send-before-scroll cache defect; its
controller regression failed before the fix. Later rapid-paging checks
caught scroll readiness being gated by metadata after the first reveal;
readiness now stays enabled once revealed. Live replies use the separate
acknowledged-message cache, then catch up from the server cursor.

Visual review exposed a pagination wrapper bypassing existing composer
clearance. The body is again a direct scroller child; cold-open browser
checks require the full latest reply above the composer. A
resize-observer regression failed before the fix and now passes.
Controlled delayed inline images prove both pinned following and a
stable reading anchor on desktop/mobile.

The first performance fixture lacked valid native event envelopes and
caused missing-log fallbacks. It is excluded from latency claims. The
final fixture uses saved native assistant events and conversation
session generations. The live test uses a temporary fixture-agent key,
attributes the reply to an existing synthetic run, and revokes the key.
It starts no model or agent process.

Local database attempts failed during a Docker shutdown. The retained
disposable database was restored and its suite passed. Early fixture
errors included a missing conversation identity field and session
generation. Mobile test setup also selected an offscreen sidebar link
and reused queued human input. Optional announcements could intercept
input; the fixture now dismisses them before the journeys. The scroll
observer now waits for the delivered wheel event and settled animation
frames, including when the viewport is already at the top. A
concurrently running live test briefly changed another probe’s row
count; the final acceptance and timing runs were sequential on separate
fixtures. The final rig uses the visible mobile navigation and a saved
agent reply. Anchor observation waits for the user's scroll to settle
before measuring the effect of live updates.

The full local `pnpm test:run` attempt hit repeated embedded PostgreSQL
initialization failures and failures in untouched native-session
executor suites; it was stopped after the repeated environment failures.
The targeted real-PostgreSQL suite passed, and final-head CI is required
before handoff. The first CI run also caught an exact mock expectation
missing the added company scope; the expectation is updated and its
179-test suite passes. The final-head first CI attempt also stalled an
assigned child task in the existing plan-approval scenario, then hit a
heartbeat-run row lock timeout during fixture cleanup. The failed shard
and aggregate check passed on an unchanged rerun of the same commit.
Scenario assertions and timeouts were unchanged. The failure and rerun
are retained in [CI run
41116120430](https://github.com/paperclipai/paperclip/actions/runs/41116120430).

## Risks

- Historical transcript diagnostics no longer load on a cold chat open.
Saved messages and conversation events remain available; diagnostic run
views keep their full records.
- Cursor paging must not omit comments with equal timestamps. Database
tests cover timestamp/UUID ordering and the complete set.
- Prepended or late content can move the reader. Browser checks cover
retained row identity, viewport offsets, mounted drafts, and Back.
Previously loaded pages stay in the query cache for its existing
lifetime.
- Local synthetic evidence does not establish deployed staging latency.
This PR does not merge or deploy the change.

## Model Used

OpenAI Codex, GPT-6 family, with reasoning, tool use, and code
execution. The exact backend deployment ID and context window were not
exposed in this session.

## 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 (affected checks; limits
are recorded above)
- [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
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-10-30 15:12:24 -05:00
DottaandPaperclip a1f77821b9 perf(tasks): show recent conversation before historical activity (#17593)
## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work.
> - A task page must show the instruction and current conversation
quickly.
> - The current page waits for related task data and historical run
transcripts.
> - These reads grow with task history, even when the reader only needs
the latest answer.
> - This pull request gives cold opens a small initial view and loads
older history on demand.
> - Messages and runs observed while the page stays open remain visible.
> - The benefit is a readable task before historical diagnostics finish
loading.

## Linked Issues or Issue Description

Related: #14667 and #16229. The first changes the reveal gate and scroll
anchors. The second adds general history pagination. This PR adds a core
task read and a folded recent-conversation view. It preserves the
default full-read API contracts. The shared files will need coordination
if either related PR lands first.

**What existing behavior does this improve?**

Cold opening an ordinary task with a long conversation or large run
logs.

**Current behavior**

Task enrichment and historical transcripts delay the readable
conversation. A cold open can fetch several megabytes of tool activity
before revealing saved messages.

**Proposed behavior**

Show the task instruction, recent saved replies, latest human input, and
the latest run's conversation data first. Fetch older messages and full
run activity when the reader chooses **More messages**. Retain new
messages while the page stays open.

## What Changed

- Add an authorized core issue view that skips related enrichment. Keep
enrichment on the existing detail read. Share task mutation, rollback
and invalidation updates with the core cache.
- Add a bounded recent-comment read. Preserve the first human
instruction when no description exists, including legacy rows with a
NULL author type. Keep company and task access checks and comment
redaction.
- Add optional recent activity and run-summary views. Fetch original
input receipts for visible comments separately so delivered messages
stay out of the queue. Reconcile watched unfinished runs after a
reconnect beyond the preview window, removing deleted runs after
reconciliation.
- Filter the latest native run's initial events to assistant messages,
request lifecycles and terminal results. Full event reads remain
available on expansion. Legacy fallback reads use a small tail extended
to the first complete record. HTTP cancellation aborts the storage read.
- Retain observed messages across cursor catch-up and new runs. Apply
local cancellation and deletion to both caches and their task aliases.
Refetch locally seeded history pages on expansion. Preserve expansion
across identifier and UUID links. Keep deep links, classic tasks and
Agent Chat on their existing full-history path.
- Update API documentation, design guidance, capability maps and
regression coverage.

## Verification

- Final acceptance on `9ea0b15ae44d9f6d2c9a9f824b4835f299f92979`: all CI
gates passed, including server/UI tests, all eight browser shards,
runner checks, full typecheck and build. [Final CI
run](https://github.com/paperclipai/paperclip/actions/runs/40326990328).
GitHub reports 55 successful checks, two intentionally skipped checks,
and one neutral Paperclip Review check described below. No checks are
pending or failed; Greptile is 5/5 and no review threads remain open.
- October 26 merge update: merged current `master`. The only conflict
was in task-page imports; both the compact-history hook and the new
live-update hooks remain. All CI tests and build jobs passed on
`044fd6733d`. Fresh review found canceled-comment cache drift, legacy
human-comment filtering, send-then-expand truncation, and partial legacy
log records. These defects were fixed in `af3d66a5bd`.
- Review-fix verification: 470 tests pass across ten affected suites,
including all six PostgreSQL cold-open tests without a helper override.
Cancellation/delete and send-then-expand regression tests failed before
the fixes and pass afterward. Coverage includes task identifier/UUID
reopen, stale in-flight reads, legacy NULL author types, local-file and
object-storage tails cut inside UTF-8 text, route forwarding, and
request cancellation. Full workspace typecheck and production build,
token gates, map validation and diff checks pass.
- Follow-up review found that a failed expanded legacy read lost its
record-alignment state on retry. `9ea0b15ae4` commits the expanded
window only after a successful read. The new regression fails before the
fix and passes afterward; all 19 transcript tests, UI typecheck, UI
build and token gates pass. Greptile reviewed this commit at 5/5 with no
actionable findings, and all review threads are resolved.
- The final Paperclip Review check ended neutral because its execution
did not complete; no passing Paperclip assessment is claimed. Its
earlier four concrete findings were fixed and regression-tested.
Greptile and the security scans completed successfully on the final
commit.
- The preceding `af3d66a5bd` CI run was canceled when superseded by the
retry fix. Its server shard 11 check briefly reported failure, but the
job API records cancellation and its test step passed all 1,750 tests.
This superseded run is not used as final CI acceptance.
- 549 focused tests pass on the final implementation across nine task
UI, activity-route, OpenAPI and PostgreSQL suites. These cover pending
history, desktop/mobile visibility, expansion, retained runs, message
bursts, cancellation recovery and queued-comment removal in both views.
- Legacy expansion keeps the latest answer visible while fetching and
deduplicating older output.
- Five PostgreSQL tests pass for core access denial, recent comments,
missing-description instructions, event paging and bounded activity/run
reads. macOS could not start another PostgreSQL cluster because it
exhausted its semaphore limit. These tests used a separate disposable
database on an existing local server through a temporary test setup
override. The helper was restored afterward.
- Full workspace typecheck and build pass with the final state fixes, as
do token gates and capability-map validation.
- Token gates, capability-map validation and `git diff --check` pass.
- Browser proof used a disposable task with 80 comments and six large
run histories. The cold view showed the instruction and recent exchange.
**More messages** revealed older comments. Navigation away and back
preserved expansion.
- Local HTTP sample: core 50 ms, recent comments 24 ms, recent run
summaries 17 ms. The latest native conversation response was 839 JSON
characters / 8 ms; its full event response was 1,099,005 / 86 ms.
Browser content paint was 1.34 seconds with development assets cached.
These are local observations, not staging latency claims.
- The first CI run passed every job except four board-send browser cases
and the review threshold. Those browser fixtures only mocked the old
comments endpoint; they now serve both recent and full reads, retaining
all message and attachment assertions. Both initial review findings were
fixed with regression tests. The next CI run passed every job. The
deeper review identified core-cache mutation, older delivery receipt and
retained run-status gaps; those are now fixed with regression coverage.
Final review is 5/5 with zero unresolved findings. Final-head CI
initially failed one unchanged runner shutdown test
(`runnerd-codex-transport.test.ts`, timeout-attachment case) with
`NativeSessionCloseUnrecoverableError`; all other CI jobs passed. The
same runner code passed on 971a762f80. A targeted local reproduction
also failed during provider drain. The failure is outside the changed
task loading paths; its underlying cause remains unresolved. The single
failed-job retry passed on the same head; this demonstrates recovery,
not a root-cause fix. All CI gates passed on the previous implementation
head `9004f94f28`: [CI run and
retry](https://github.com/paperclipai/paperclip/actions/runs/40192334629).
- `pnpm test:run` was attempted and stopped after repeated embedded
PostgreSQL startup failures. The native session suite recorded 15
database-related failures; other database suites could not start. No
complete local suite pass is claimed.

## Risks

- The compact view intentionally omits older diagnostics until
expansion. Existing open questions and approvals still use the current
interaction and run paths.
- Previously observed comment and activity rows remain cached while
open. The newest preview and incoming cursor pages refresh; this does
not add a general historical-edit synchronization protocol.
- Recent views are optional. Existing full API callers retain their
response shape and behavior. No migration is required.
- A legacy tail can exceed the requested byte limit by the prefix of its
first log record. Backward reads stop at the preceding record boundary
and honor cancellation.
- Staging has not been deployed or qualified with this change. Instance
startup latency is separate from task history loading.
- The related open PRs touch the same task-history files.

## Model Used

OpenAI Codex, based on GPT-6, with reasoning, repository editing, shell
tools and browser testing. The exact serving model identifier and
context-window size are not exposed in this session.

## 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 — 549 affected task tests;
the full local suite and unrelated runner failure are documented above
- [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
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-10-26 08:11:39 -05:00