- Convergence section added: the assembled recommendation (shape,
engines, contract starting shape, ownership, scope) in one place
- OQ register given consistent status lines (resolved / open —
<work-type> / open); OQ-ST-03 deduplicated (two duplicate
resolution paragraphs collapsed), OQ-ST-07's stale extraction
residue removed, OQ-ST-08 absorbs POC #2's pg multi-host input
- Front-matter changelog compressed; interface finding promoted to
a real heading (anchors were informal § prose references)
- Driver-conflict section updated to resolved state, corrections
folded; Phase 0 plan renumbered and marked final state
- Scope: no content decisions changed — restructure only
Review pass in this repo: contract suite re-verified (11/11 pass under
--test-threads=1 against the harness server; default parallel runs
interfere across tests via the shared db/channels engine_for_test
harness — each test spawns its own listener on poc:q/s/n and truncates
shared tables, so parallel tests receive each other's notifications and
race truncates). Recorded as a harness caveat in the findings with the
Phase 1 note (per-test namespaces), NOT as a contract failure — every
test passes in isolation. Findings invocation note + artifacts section
updated; phase-0 frontmatter carries the verification qualifier.
OQ-ST-03 closure text already folded by the POC session stands.
Findings: unified surface holds on tokio-postgres with the transactional
property intact (in-tx NOTIFY is commit-atomic; rollback drops all);
LISTEN wake beats poll 5-16x at p50 with 300/300 isolated delivery;
pooled-LISTEN discard (deadpool#360) verified and pinned as our own test;
postgres-notify 0.3.8 evaluated and passed over (lazy reconnect, no
initial-connect script, unquoted identifier LISTENs) in favor of the
~90-line hand-rolled forwarder with test-pinned pitfalls. sqlx PgListener
fallback retired unfired.
Two claims verified independently before folding: (1) deadpool-postgres
discards async notifications — upstream deadpool-rs/deadpool#360 (open,
Oct 2024) confirms the pool's connect task awaits the connection to
completion, dropping what only poll_message exposes; pooled LISTEN is
lost at recycle. The dedicated non-pooled LISTEN connection is now
upstream-verified required, not spec-preferred. (2) postgres-notify
0.3.8 exists as described (MIT, tokio-postgres, auto-reconnect with
backoff+jitter, multi-channel subscribe_notify, connect_script hook)
— admitted as sub-module L's second arm (hand-rolled forwarder vs
turnkey listener substrate), with in-probe verification required:
docs don't explicitly promise subscription restoration across
reconnect; connect_script is the mechanism; single-maintainer posture
recorded. New property test pinned: pooled-LISTEN-discard assertion
(our own evidence for the #360 behavior, flips if upstream fixes).
Probe 5 updated to budget accounting (listener conn outside the pool).
Completes OQ-ST-03: one driver posture (tokio-postgres + deadpool, the
POC #5/#7-validated stack) with three sub-modules — L (LISTEN plumbing:
dedicated connection, multi-channel, payload boundary), T (tx-seam over
the pool: caller-owned tx handle vs closure-scoped, both implemented
and compared — direct OQ-ST-04 input), W (wake-vs-poll parity, LISTEN
reconnect + the replay hole honesty). Property tests are the POC #1
suite's pg twin; seam probe mirrors the POC #1 workload for the
cross-engine relative claim. Gate: commit-atomicity via in-tx NOTIFY
(load-bearing), exactly-once claim, seam costs, LISTEN robustness -
failure names the sqlx PgListener fallback posture. Out of scope:
queue semantics depth (OQ-ST-05), pgboss-rs code adoption, multi-host
stress (OQ-ST-08). Register row added, plan updated (POC #2 running
closes OQ-ST-03).
Findings (poc-sqlite-posture-findings.md, run in a parallel session;
tests re-verified in this session — 4 passing): all three of Arm A's
gate conditions fired in its favor — bridged rusqlite ~2x sqlx
native-async at p50 (B's premise measured false), honker-core's
inherited watcher tighter than a re-derived one (p50 1.40 vs 2.15 ms,
max 29 vs 172 ms, battle-tested failure handling), and the .so runtime
dependency is packaging cost with no compensating advantage.
Transactional property holds identically on both (SQLite's property,
not the posture's). Constraints recorded: honker-core 0.5.0 pins
rusqlite ^0.40.1 (rustc >=1.99); mixed rusqlite+sqlx binaries need a
vendored libsqlite3-sys patch (OQ-ST-02's per-engine-crate split keeps
the engine binary single-driver). Fixed the findings' test-count
discrepancy (4 tests, verified running). Phase-0: OQ-ST-03 SQLite half
resolved (pg half remains), OQ-ST-04/05/06 carry POC input, register
row gains findings link + status, plan step 2 split into done/next,
frontmatter updated, POC crate added to references.
Arm A: honker-core linked on our rusqlite (bridge per REQ-TTY-01, honker's watcher). Arm B: honker extension .so over sqlx-sqlite (natively async call path, own watcher, per-pool-connection extension + bootstrap — stress-testing what the CI proof script doesn't cover: pool wiring, lost connections, full surface). Option 2 (honker-rs-as-substrate) dropped from scope with reasoning: its mutex-pinned sync transaction model is subsumed by both other postures' trade space. Five probes (async seam, watcher, transactional contract, packaging, cross-process interop), a decision gate including a legitimate hybrid verdict, and out-of-scope boundaries (postgres side, full surface, extension-as-consumer-feature regardless of outcome). Phase-0: POC register added, plan/frontmatter updated; AGENTS.md: POC-register convention codified.
Operator-named options, verified against the honker checkout @ f4e53c6:
(1) honker-core on our own rusqlite connection (attach_honker_functions,
the alknet-filesystem POC's usage); (2) honker-rs as the SQLite
substrate (max reuse, least control — own connections, mutex-pinned
transactions, sync-under-async-core); (3) raw SQL over sqlx-sqlite with
the honker loadable extension — CI-proven in the checkout's own ORM
proof suite (scripts/proof/orm/rust: transactional enqueue natively
async, rollback-drops-job asserted), which dissolves most of the async
tension on the SQLite side at the cost of a runtime .so dependency and
watcher ownership moving in-crate. Options 1/3 are compatible with
tokio-postgres on the postgres side under the OQ-ST-02 split. First-POC
candidate named: options-1-vs-3 comparison on the same surface.
The async-facing-trait + sync-bridge posture (blocking impl on dedicated
threads/spawn_blocking feeding tokio channels, documented as a supported
strategy not a workaround) is already family-standard twice over: alktty
REQ-TTY-01 and alkblobs' spawn_blocking-in-engine-impls execution
posture. Recorded verbatim-sourced in OQ-ST-03; reframes the honker-rs
sync→async port as bridge-at-the-trait-seam vs native-async-rewrite and
weakens sqlx's main differentiator on the sqlite side. alktty added to
references.
Supersedes the inventory's single-crate lean (which was inductive from
'feature sets do not diverge'). Reason recorded: the split isolates the
engines' real asymmetry of work — sqlite rides honker's machinery as
the baseline; postgres is the build-heavy side (LISTEN/NOTIFY +
pg-boss-family schema work) — and makes future engines additive rather
than feature-graph edits. The inventory's uniform-feature-family fact
stands, re-read as 'the core contract stays small'; correction noted in
both documents. Phase-0 plan updated (step 2 resolved, step 3 references
the core-crate trait surface).
The inventory graded streams absent because no paused consumer document
names it; the operator correction: type-filtered event watching from
several places (e.g. repo-change subscriptions in a git app at
gitea/gitlab scale) is a basic reactivity requirement — and notify
(fire-and-forget, no replay) cannot serve subscriptions honestly.
The wanters are applications above the paused crates, which is why the
docs don't carry the row.
Inventory: streams row recorded on operator authority (the REQ-2
recording convention from alkblobs requirements.md), confidence system
gains the operator-authority grade; rate-limits becomes the sole
first-cut candidate. phase-0: OQ-ST-01 summary and OQ-ST-04's
contract-candidates updated to match.
consumer-inventory.md: per-feature scope synthesis over the paused
consumers' written artifacts (alkfs phase-0, alkgit architecture,
alkblobs ADRs, alknet-filesystem POC) — dissolves the circular
'deferring to consumers who can't run until we exist' framing.
notify/locks pinned-or-documented (alkfs invalidation + writer coord,
alkblobs fleet sweeper); queues/outbox documented (alkfs sync outbox,
alkblobs embedder-owned cadence); scheduler documented-thin; streams/
rate-limits/result-storage have no named consumer — kept per working
posture with cut flags, to revisit before implementation.
phase-0.md: OQ-ST-01 answered by the inventory; OQ-ST-02 narrowed
(uniform feature family across engines favors single-crate shape);
OQ-ST-07 sharpened (no consumer needs the loadable-extension surface —
cut-only decision); OQ-ST-04 contract-pinning scoped to inventory rows;
plan step 1 marked done; references extended.
AGENTS.md: architecture context gains the inventory with its
add-a-row-before-assuming rule.
- complete the dangling honker prior-art sentence; fold the pg_notify
posture into the interface-finding paragraph instead of the
'restated conclusion' trailing paragraph
- reference checkouts are read freely but not for direct dependency
use; published versions unless vendored/forked (alksocks precedent)
- pin honker @ f4e53c6 (russellromney/honker) and pgboss-rs @ 98f7d9e
by path+revision per AGENTS.md §3
- reflow one hard-broken hyphen in the honker-rs limitations list
Read the four honker.dev guides (queues/streams/pubsub/scheduler) +
packages/honker-rs/src/lib.rs (v0.5.0, 1706 lines):
- honker's Rust binding exposes the exact surface shape alkstore wants
(queue claim/ack/visibility, streams with tx-aware offsets, notify/
listen, leader-elected scheduler, outbox, locks/rate-limits/results)
— the unified-API question shifts from shape-invention to contract-
pinning on that surface (new 'Interface finding' section)
- honker's own processing-guarantees table (per-binding auto-checkpoint
vs manual offset save) is the named seam a single-crate contract
cleans up
- honker-rs is sync-only (std threads, no tokio) — SQLite side is a
port-and-adapt under any posture, folded into driver-conflict
corrections + OQ-ST-03/04/06 refinements
- pgboss-rs LISTEN/NOTIFY absence (verified earlier) now stated as the
substantive fork-or-derive comparison point (OQ-ST-05)
glm-5.3-flash