- ruff format on two test modules that had drifted (a stray blank line
and multi-line calls that now fit on one line) — restores a clean
`ruff format --check`.
- test_attachment_buffer: pull `buf.discard(...)` out of the `assert`
expressions into locals so the eviction still runs under `python -O`
(CodeQL: assert statement has a side effect).
- Buffer (attachment_buffer.py): content-address staged bytes once and track the
per-(ws_id,user_id) references to them, so identical bytes staged from two tabs
dedupe to one copy yet neither scope's send can drop the other's pending upload
(the prior hash-only key let one overwrite the other). Single lock; add a public
clear() that replaces test reaches into the private store.
- GC: lift the byte-identical _release_attachment_refs out of both backends into one
dialect-agnostic storage/_utils.release_attachment_refs with a portable searched-
CASE single-query decrement (was one UPDATE per id in a Python loop).
- _format_messages_for_summary: mark by-reference vision results
({type:image, attachment_id}) as [image], not just inline image_url.
- Security: escape_like() the attachment_referenced_in_ws LIKE needle on both
backends; secrets.compare_digest for the output-guard operator-fence leak check.
A deep-dive review of the branch surfaced a budget regression, SDK doc
drift, dead code, and stale docstrings. Each was boundary-spiked before
fixing.
- R1 (regression): by-reference document attachments were invisible to the
token budget — _msg_text_chars returned 0 doc_chars for a
{type:document,attachment_id} placeholder, and the comment's claim that
the budget "lands at calibration" was false (calibration discards
doc_chars). Thread the doc size through _attachments_meta (size_bytes, at
both the live-append and reconstruct build sites) and count it in
_msg_text_chars, guarded against double-counting the inline form.
Regression test added.
- F1: the history-DTO schema description and the TS HistoryEvent docstring
still advertised the removed reminders/advisories keys and omitted the
system role; corrected server_schemas.py + sdk/typescript/src/events.ts to
match the shipped shape. The committed OpenAPI JSON snapshots were already
~679 lines stale on main; their regen is left to its own chore branch.
- D1: removed AttachmentBuffer.take() — dead (no production caller; the
commit path uses discard()) and scope-weak (ws_id only, unlike its
siblings) — with its test and the now-orphaned Iterable import.
- O1: 4 docstrings referenced the moved ChatSession._fold_system_turns →
lowering.fold_system_turns.
The content-addressed model writes blob bytes to workstream_attachments only at
send-commit (so every stored blob is born referenced). Pending uploads — between the
upload request and the send that references them — live in this per-node, content-hash-
keyed buffer, scoped to (ws_id, user_id) and bounded by a TTL + total-size ceiling
(OOM-safety, not the removed per-user cap). ws->node affinity (HRW routing) keeps it
process-local. Losing an unsent upload on crash/re-route is acceptable transient state.
This replaces the persisted pending/reserved/consumed lifecycle + orphan-sweep. No
consumers yet — the upload-endpoint rework and the send-commit drain wire onto it as the
attachment cutover lands.
Patrick Buckley