From d8a2412d7577b6c8cbec24a9c6c4d17b2e059a38 Mon Sep 17 00:00:00 2001
From: Adam Moussa <166072409+amoussa1229@users.noreply.github.com>
Date: Wed, 22 Jul 2026 15:40:49 -0400
Subject: [PATCH] fix(fetchboa): read real CashPro field names; extend BAI code
 map; 7-day window (#75)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The deployed v2 pipeline was fully inert: the classifier never read
detailText (where the live API carries the ACH DES:PAYMENTS text) and
the handler keyed event dates off valueDate, which the API does not
send (it sends asOfDate) — so ACH could not classify and no event of
any kind could apply. Both proven against real captured responses.

- classifyTransaction: detailText first in the description chain;
  Summary-row guard (new "summary" event); all-zeros customerReference
  normalizes to empty instead of fabricating check number 0.
- BAI_CODE_EVENTS: empirical enumeration lands — 255 + 252 are both
  check-numbered return credits, 266 is the no-number return credit
  (text disambiguates ach_return vs electronic_return via new
  fallbackEvent semantics), 455 is ach_debit via DES text or ignored
  third-party autopay, 170/201/470/481 are noise.
- postingDate helper (asOfDate ?? valueDate) drives both the sort and
  event dates; unmatched reason is now "missing posting date".
- Default replay window widened to trailing 7 days ending yesterday:
  self-healing across missed runs; responses verified pagination-free.

Refs: #66, #69
---
 .claude/scheduled_tasks.lock |   1 -
 .gitignore                   |   4 +-
 README.md                    |  15 ++-
 src/boaRecon.js              | 113 ++++++++++++----
 src/fetchBoaTransactions.js  |  46 +++++--
 tests/boaRecon.test.js       | 252 ++++++++++++++++++++++++++++++++++-
 tests/postingDate.test.js    |  27 ++++
 7 files changed, 420 insertions(+), 38 deletions(-)
 delete mode 100644 .claude/scheduled_tasks.lock
 create mode 100644 tests/postingDate.test.js

diff --git a/.claude/scheduled_tasks.lock b/.claude/scheduled_tasks.lock
deleted file mode 100644
index 9957315..0000000
--- a/.claude/scheduled_tasks.lock
+++ /dev/null
@@ -1 +0,0 @@
-{"sessionId":"a426a233-ab23-4dc4-a01b-27f4e6970165","pid":33318,"procStart":"Fri Apr 24 17:44:23 2026","acquiredAt":1777054008237}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 5e43b98..1412c9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,6 @@ BofA API Resources/
 *.csv
 postman-output.txt
 stampli_*.txt
-.env
\ No newline at end of file
+.env
+.claude/settings.local.json
+.claude/scheduled_tasks.lock
diff --git a/README.md b/README.md
index 7e6ffef..fba1f28 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,18 @@ Two separate CashPro APIs are used, each with its own OAuth credentials:
 
 The scheduled Lambda reconciles the Previous Day feed onto `payment#` records (pure logic lives in `src/boaRecon.js`, covered by `npm test`).
 
-**Classification.** Transactions are classified via a BAI transaction-code map (`BAI_CODE_EVENTS`; only 475 = check paid debit is empirically confirmed so far — the remaining codes are pending an enumeration replay over known event dates) with a fallback classifier over the statement description formats (ARP refer-to-maker, return-of-posted-check check-numbered and electronic variants, ACH CCD `DES:PAYMENTS ID:PMT` lines). Unmapped codes on check-shaped transactions are logged (`console.error`) and counted in the run summary — never silently dropped.
+**Classification.** The API's Detail rows carry the statement line in `detailText` (ACH `DES:PAYMENTS ID:PMT` text, return descriptions) and the posting date in `asOfDate` (ISO); `transactionType: "Summary"` rows are balance/total lines and classify as `summary` (skipped, counted). Only 475 check-paid rows omit `detailText` — their check number rides in `customerReference` (all-zeros references normalize to empty, never check number 0). Classification runs the empirically-enumerated BAI code map first, then the description-text classifiers:
+
+| BAI code | Feed label | Event |
+|---|---|---|
+| 475 | Check Paid | `check_paid` (number in `customerReference`) |
+| 255 | Check Posted and Returned CR | `check_return` (number in `customerReference`) |
+| 252 | Debit Reversal Credit | `check_return` (second return-credit code) |
+| 266 | Return Item Credit | text decides (`ach_return` on PMT text, `check_return`/`electronic_return` on return text); bare rows fall back to `electronic_return`; unreadable text stays `unknown` (loud, no write) |
+| 455 | Preauthorized ACH Debit | `ach_debit` via `DES:PAYMENTS` text; DES-less = third-party autopay → ignored |
+| 170/201/470/481 | totals, transfers, loan payments | ignored |
+
+A hard code-map event wins over description text; 266/455 carry *fallback* events consulted only when the text yields nothing. Unmapped codes on check-shaped transactions are logged (`console.error`) and counted in the run summary — never silently dropped.
 
 **Matching.** Check events match on check number AND amount, evaluating all candidates (bank postings can drop/collapse digits on long check numbers). A number match with the WRONG amount never auto-resolves — it is the altered-check/collapsed-posting signal and goes to unmatched for human review. An unknown number falls back to an exact-amount match within checks issued in the last 120 days, and only when the posting's digits are a subsequence of the candidate's check number (or vice versa); return credits additionally require a bank-confirmed candidate. Zero or multiple fallback candidates means unmatched, recorded in the run summary with no write. Electronic returns (no check number) match by exact amount among bank-confirmed payments.
 
@@ -90,7 +101,7 @@ The scheduled Lambda reconciles the Previous Day feed onto `payment#` records (p
 
 Each applied event is appended to a `history` list attribute (`{event, date, bankRef, amount}`); identical replayed events are idempotent noops.
 
-**Replay.** The handler accepts an optional payload `{"fromDate": "YYYY-MM-DD", "toDate": "YYYY-MM-DD"}` (strictly validated; `toDate` defaults to `fromDate`) for weekend/outage gap replays and BAI-code enumeration runs. With no payload it queries the trailing 3-day window (today−3 .. today−1), so the Monday run covers Friday–Sunday; overlapping days are idempotent (event identity `{event, date, amount}`). Feed rows without a valid `valueDate` are never applied with a substituted date — they go to unmatched for review.
+**Replay.** The handler accepts an optional payload `{"fromDate": "YYYY-MM-DD", "toDate": "YYYY-MM-DD"}` (strictly validated; `toDate` defaults to `fromDate`) for weekend/outage gap replays and BAI-code enumeration runs. With no payload it queries the trailing 7-day window (today−7 .. today−1) — self-healing across missed runs and holiday gaps; overlapping days are idempotent (event identity `{event, date, amount}`), and multi-day responses were verified pagination-free up to 9-day windows. Feed rows without a valid posting date (`asOfDate`, with `valueDate` as a fixture-era fallback) are never applied with a substituted date — they go to unmatched for review.
 
 **Run summary.** Each run writes an append-only `boa_recon#<fromDate>_<toDate>#<runAt>` item (90-day TTL) with counts per classified event type, matched/applied/redeposit/voided-and-bounced/write-conflict totals, the unmatched check numbers and amounts (list capped at 50; full count kept), unknown BAI codes (capped at 20 distinct keys), and the staleness sweep results. Unmatched and unknown-code transactions also `console.error` (Slack alerting is tracked in #71). Payment writes are conditioned on the read snapshot's `status`/`clear_status` and retried once against a fresh read on conflict.
 
diff --git a/src/boaRecon.js b/src/boaRecon.js
index 4a84788..b304270 100644
--- a/src/boaRecon.js
+++ b/src/boaRecon.js
@@ -21,18 +21,38 @@ const cents = (v) => Math.round(Math.abs(parseAmount(v)) * 100);
 // not pair with another blank amount).
 export const amountsEqual = (a, b) => cents(a) > 0 && cents(a) === cents(b);
 
-// BAI transaction-code -> event map. BoA's Previous Day feed uses standard
-// BAI type codes; only 475 (check paid, debit) is empirically confirmed so
-// far. The codes for ARP refer-to-maker return credits, return-of-posted-
-// check credits (check-numbered and electronic variants), ACH CCD debits and
-// return credits, and the true meaning of 255 (the old filter assumed
-// "returned check", unverified) are pending the enumeration replay over
-// known event dates (2/20, 3/31, 4/8, 6/16-6/23) — add them here as they
-// are confirmed. Until then classification falls back to description text,
-// and unmapped codes on check-shaped transactions are logged and counted,
-// never silently dropped.
+// BAI transaction-code -> event map, enumerated empirically from replays
+// over the known event windows (2/19-21, 3/30-4/1, 4/7-9, 6/15-23) plus
+// live captures on 2026-07-22:
+//   475 "Check Paid" debit -> check_paid (these rows carry NO detailText;
+//       the check number rides in customerReference)
+//   255 "Check Posted and Returned CR" credit -> check_return (check # in
+//       customerReference; the ARP refer-to-maker family)
+//   252 "Debit Reversal Credit" credit -> check_return (second return-credit
+//       code; check # in customerReference)
+//   266 "Return Item Credit" credit -> covers BOTH electronic check returns
+//       AND ACH/bill-pay bounces (customerReference all zeros); the
+//       description text disambiguates, so its event is a FALLBACK used only
+//       when the text yields nothing
+//   455 "Preauthorized ACH Debit" debit -> ours carry DES:PAYMENTS in
+//       detailText -> ach_debit via text; a DES-less 455 is a third-party
+//       autopay -> ignored (counted in the histogram, not alarmed as unknown)
+//   170/201/470/481 -> statement noise (summary totals, funding transfers,
+//       loan payments) -> ignored
+// A hard `event` wins over description text; `fallbackEvent` is consulted
+// only when the description yields no event. Unmapped codes on check-shaped
+// transactions still come back "unknown" — logged and counted, never
+// silently dropped.
 export const BAI_CODE_EVENTS = {
   475: { event: "check_paid", direction: "debit" },
+  255: { event: "check_return", direction: "credit" },
+  252: { event: "check_return", direction: "credit" },
+  266: { fallbackEvent: "electronic_return", direction: "credit" },
+  455: { fallbackEvent: "ignored", direction: "debit" },
+  170: { event: "ignored" },
+  201: { event: "ignored" },
+  470: { event: "ignored" },
+  481: { event: "ignored" },
 };
 
 // Standard BAI ranges: 100-399 are credit type codes, 400-699 are debit
@@ -61,10 +81,13 @@ export function directionOf(txn) {
 
 // Statement description formats observed on the 2026-07-21 reconciliation.
 const ARP_RETURN_RE = /^ARP RETURNED CHECK REFER TO MAKER CHECK #\s*(\d+)\b/i;
+// Live detailText prefixes the statement line with an MMDDYY token
+// ("061626 RETURN OF POSTED CHECK / ITEM ..."); both anchors accept it so
+// the return classifiers work on the real feed, not just statement exports.
 const POSTED_RETURN_CHECK_RE =
-  /^RETURN OF POSTED CHECK \/ ITEM \(RECEIVED ON \d{2}-\d{2}\)\s*CHECK #\s*(\d+)\b/i;
+  /^(?:\d{6}\s+)?RETURN OF POSTED CHECK \/ ITEM \(RECEIVED ON \d{2}-\d{2}\)\s*CHECK #\s*(\d+)\b/i;
 const POSTED_RETURN_ELECTRONIC_RE =
-  /^RETURN OF POSTED CHECK \/ ITEM \(RECEIVED ON \d{2}-\d{2}\)\s*ELECTRONIC TRANSACTION\b/i;
+  /^(?:\d{6}\s+)?RETURN OF POSTED CHECK \/ ITEM \(RECEIVED ON \d{2}-\d{2}\)\s*ELECTRONIC TRANSACTION\b/i;
 const ACH_PMT_RE = /DES:PAYMENTS\s+ID:PMT\s*(\d+)/i;
 const PMT_INFO_RE = /PMT INFO:\s*(.*)$/i;
 const CHECK_PAID_RE = /^CHECK\s{0,10}#?\s{0,10}0*(\d{1,12})$/i;
@@ -86,13 +109,30 @@ const stripLeadingZeros = (s) => String(s ?? "").replace(/^0+(?=\d)/, "");
 // (transfers, misc bank activity) is "ignored".
 export function classifyTransaction(txn) {
   const code = String(txn.transactionCode ?? "").trim();
-  const description = String(
-    txn.text ?? txn.description ?? txn.transactionDescription ?? ""
-  )
-    .slice(0, MAX_DESCRIPTION_LEN)
-    .trim();
-  const customerReference = stripLeadingZeros(String(txn.customerReference ?? "").trim());
-  const bankReference = String(txn.bankReference ?? "").trim();
+  // Substantive statement text: detailText is where the live API carries
+  // the rich line (ACH DES:PAYMENTS text, return descriptions); text /
+  // description cover statement-derived fixtures. transactionDescription
+  // (the short code label, e.g. "Return Item Credit") is deliberately NOT
+  // substantive — a label is not evidence — and is used only as the display
+  // fallback.
+  // First NON-EMPTY of the substantive fields — ?? alone would let an
+  // empty-string detailText shadow a populated text/description field.
+  const substantiveText = [txn.detailText, txn.text, txn.description]
+    .map((v) => String(v ?? "").slice(0, MAX_DESCRIPTION_LEN).trim())
+    .find(Boolean) ?? "";
+  const description =
+    substantiveText ||
+    String(txn.transactionDescription ?? "").slice(0, MAX_DESCRIPTION_LEN).trim();
+  // Reference fields are bank-generated and short (12 digits observed);
+  // bound them so a malformed feed can never balloon DDB items or matching.
+  const rawReference = stripLeadingZeros(
+    String(txn.customerReference ?? "").trim().slice(0, 64)
+  );
+  // An all-zeros reference ("000000000000" on 266 return credits) means "no
+  // reference", not check number 0 — stripLeadingZeros alone leaves "0",
+  // which would fabricate a checkNumber.
+  const customerReference = rawReference === "0" ? "" : rawReference;
+  const bankReference = String(txn.bankReference ?? "").trim().slice(0, 64);
   const amount = Math.abs(parseAmount(txn.amount));
   const direction = BAI_CODE_EVENTS[code]?.direction ?? directionOf(txn);
 
@@ -110,6 +150,13 @@ export function classifyTransaction(txn) {
     checkShaped: false,
   };
 
+  // Summary rows (balance/total lines, transactionType "Summary") are not
+  // events; bail before the description regexes so their labels ("Total
+  // Checks Paid Debit") can't pollute unknown/check-shaped counting.
+  if (String(txn.transactionType ?? "").trim().toLowerCase() === "summary") {
+    return { ...base, event: "summary" };
+  }
+
   // Description facts, extracted regardless of code so a code-mapped event
   // still carries the check number / PMT id it references.
   let descriptionEvent = null;
@@ -142,7 +189,18 @@ export function classifyTransaction(txn) {
     base.checkNumber = stripLeadingZeros(m[1]);
   }
 
-  const event = BAI_CODE_EVENTS[code]?.event ?? descriptionEvent;
+  const mapped = BAI_CODE_EVENTS[code];
+  let event = mapped?.event ?? descriptionEvent ?? null;
+  if (!event && mapped?.fallbackEvent) {
+    // "ignored" is a safe fallback anytime (455 third-party autopays carry
+    // substantive non-PMT text by design). A WRITE-capable fallback (266 ->
+    // electronic_return, which enters amount-only matching) applies only to
+    // a bare row: substantive text that matched no classifier must stay
+    // loud as "unknown", never silently become a Returned write.
+    if (mapped.fallbackEvent === "ignored" || !substantiveText) {
+      event = mapped.fallbackEvent;
+    }
+  }
 
   if (event === "check_paid" && !base.checkNumber) {
     base.checkNumber = customerReference || null;
@@ -153,8 +211,11 @@ export function classifyTransaction(txn) {
 
   if (event) return { ...base, event };
 
+  // Shape test uses the RAW reference: an all-zeros reference still means
+  // the bank posted a structured row (the zero-guard must not silence
+  // unmapped return-credit codes, which present exactly this way).
   base.checkShaped =
-    Boolean(customerReference) || /CHECK/i.test(description) || Boolean(base.pmtId);
+    Boolean(rawReference) || /CHECK/i.test(description) || Boolean(base.pmtId);
   return { ...base, event: base.checkShaped ? "unknown" : "ignored" };
 }
 
@@ -454,8 +515,8 @@ export function isValidISODate(s) {
 }
 
 // Optional {fromDate, toDate} replay payload. The default is a trailing
-// 3-day window (today-3 .. today-1): the previous-day feed only runs on
-// weekdays, so the Monday run must cover Friday through Sunday. Overlapping
+// 7-day window (today-7 .. today-1): weekend/holiday gaps and missed runs
+// self-heal inside a week without manual replays. Overlapping
 // days are safe — event identity makes replays idempotent. Strings are
 // validated strictly so a malformed payload fails loudly instead of
 // querying a garbage range.
@@ -463,9 +524,13 @@ export function resolveDateRange(event, now = new Date()) {
   const hasFrom = event?.fromDate != null;
   const hasTo = event?.toDate != null;
   if (!hasFrom && !hasTo) {
+    // Trailing 7 days ending yesterday: self-healing across missed runs,
+    // outages, and holiday gaps — replays are idempotent (event identity
+    // noops), so the overlap is free. Pagination-free responses verified
+    // empirically up to 9-day/420-row windows (2026-07-22 captures).
     const day = 24 * 60 * 60 * 1000;
     return {
-      fromDate: new Date(now.getTime() - 3 * day).toISOString().split("T")[0],
+      fromDate: new Date(now.getTime() - 7 * day).toISOString().split("T")[0],
       toDate: new Date(now.getTime() - day).toISOString().split("T")[0],
     };
   }
diff --git a/src/fetchBoaTransactions.js b/src/fetchBoaTransactions.js
index 45d2eec..c303893 100644
--- a/src/fetchBoaTransactions.js
+++ b/src/fetchBoaTransactions.js
@@ -13,6 +13,7 @@ import {
   resolveDateRange,
   sweepStalePayments,
 } from "./boaRecon.js";
+import { toISODate } from "./dates.js";
 
 const ddb = DynamoDBDocumentClient.from(new DynamoDBClient());
 const secrets = new SecretsManagerClient();
@@ -22,6 +23,29 @@ const BOA_BASE_URL = process.env.BOA_BASE_URL;
 const UNMATCHED_LIST_CAP = 50;
 const UNKNOWN_CODES_CAP = 20;
 
+// Posting date for one feed row. The live API carries it in asOfDate (ISO,
+// verified 2026-07-22); valueDate never appears in real responses but is
+// kept as a fallback for statement-derived fixtures. toISODate normalizes a
+// non-ISO capture (M/D/YY[YY]) and returns null on garbage — never
+// substitute a date.
+export const postingDate = (txn) => {
+  // First NON-EMPTY — an empty-string asOfDate must not shadow a populated
+  // valueDate (?? only skips null/undefined).
+  const raw = [txn.asOfDate, txn.valueDate]
+    .map((v) => String(v ?? "").trim())
+    .find(Boolean);
+  const iso = isValidISODate(raw) ? raw : toISODate(raw);
+  if (!iso) return null;
+  // Plausibility window mirroring the CSV path's isPlausibleSendYear (#65):
+  // epoch artifacts ("12/31/69" -> 2069 via the 2-digit-year fallback) and
+  // absurd years must go loud via the missing-posting-date path — a wrong
+  // far-future returned_date would permanently noop later real events.
+  const year = parseInt(iso.slice(0, 4), 10);
+  const nowYear = new Date().getFullYear();
+  if (year < nowYear - 7 || year > nowYear + 2) return null;
+  return iso;
+};
+
 let cachedCreds;
 async function getReportingCreds() {
   if (cachedCreds) return cachedCreds;
@@ -64,7 +88,7 @@ const directionRank = (d) => (d === "debit" ? 0 : d === "credit" ? 1 : 2);
 
 export const handler = async (event) => {
   // Optional replay payload {fromDate, toDate}; default is the trailing
-  // 3-day window so the Monday run covers Friday through Sunday.
+  // 7-day window ending yesterday (self-healing across missed runs).
   const { fromDate, toDate } = resolveDateRange(event ?? {});
 
   const { appId, clientId, token: clientSecret, accountNumber, bankId } = await getReportingCreds();
@@ -105,7 +129,7 @@ export const handler = async (event) => {
   }));
   classifiedTxns.sort(
     (a, b) =>
-      String(a.txn.valueDate ?? "").localeCompare(String(b.txn.valueDate ?? "")) ||
+      String(postingDate(a.txn) ?? "").localeCompare(String(postingDate(b.txn) ?? "")) ||
       directionRank(a.classified.direction) - directionRank(b.classified.direction)
   );
 
@@ -161,13 +185,19 @@ export const handler = async (event) => {
   for (const { txn, classified } of classifiedTxns) {
     summary.classified[classified.event] = (summary.classified[classified.event] || 0) + 1;
 
-    if (classified.event === "ignored") continue;
+    if (classified.event === "ignored" || classified.event === "summary") continue;
 
     if (classified.event === "unknown") {
       summary.unknown_count++;
-      const codeKey = (classified.code || "?").slice(0, 16);
+      // Histogram keys must be inert: real BAI codes are short digit runs;
+      // anything else ("__proto__", "constructor", junk) gets a prefix so
+      // it can never collide with Object.prototype semantics or break SDK
+      // marshalling (a bare "constructor" own key crashes convertToAttr —
+      // Object.create(null) is no escape, it crashes marshalling outright).
+      const rawCode = classified.code || "?";
+      const codeKey = /^[0-9]{1,16}$/.test(rawCode) ? rawCode : "x" + rawCode.slice(0, 15);
       if (
-        codeKey in summary.unknown_codes ||
+        Object.hasOwn(summary.unknown_codes, codeKey) ||
         Object.keys(summary.unknown_codes).length < UNKNOWN_CODES_CAP
       ) {
         summary.unknown_codes[codeKey] = (summary.unknown_codes[codeKey] || 0) + 1;
@@ -182,11 +212,11 @@ export const handler = async (event) => {
 
     // Never substitute a date: event identity and transition ordering both
     // key on the posting date, so a feed row without one is a human case.
-    if (!isValidISODate(txn.valueDate)) {
-      recordUnmatched(classified, "missing valueDate");
+    const eventDate = postingDate(txn);
+    if (!eventDate) {
+      recordUnmatched(classified, "missing posting date");
       continue;
     }
-    const eventDate = txn.valueDate;
 
     let match;
     if (classified.event === "ach_debit" || classified.event === "ach_return") {
diff --git a/tests/boaRecon.test.js b/tests/boaRecon.test.js
index ff945ad..943f7a4 100644
--- a/tests/boaRecon.test.js
+++ b/tests/boaRecon.test.js
@@ -752,9 +752,9 @@ test("classifier: pathological long input is bounded, classified without hanging
 
 // ------------------------------------------------------------- date range
 
-test("resolveDateRange: default is the trailing 3-day window (Mon covers Fri-Sun)", () => {
+test("resolveDateRange: default is the trailing 7-day window ending yesterday", () => {
   const r = resolveDateRange({}, new Date("2026-07-21T13:00:00Z"));
-  assert.deepEqual(r, { fromDate: "2026-07-18", toDate: "2026-07-20" });
+  assert.deepEqual(r, { fromDate: "2026-07-14", toDate: "2026-07-20" });
 });
 
 test("resolveDateRange: explicit valid range passes through", () => {
@@ -782,3 +782,251 @@ test("isValidISODate rejects non-strings and bad calendar dates", () => {
   assert.equal(isValidISODate("2026-13-01"), false);
   assert.equal(isValidISODate(20260720), false);
 });
+
+// --- Live-API field shapes (real captures, 2026-07-22; account/bank ids
+// --- not part of transaction rows, amounts/refs/detailText verbatim) ---
+
+test("live shape: 455 ACH debit classifies via detailText", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-07-22",
+    transactionCode: "455",
+    transactionDescription: "Preauthorized ACH Debit",
+    transactionType: "Detail",
+    amount: "14516.84",
+    creditDebitIndicator: "Debit",
+    customerReference: "000000000000",
+    bankReference: "02023379940",
+    detailText:
+      "ALLIANCE SANITAT DES:PAYMENTS ID:PMT 7854980 INDN:Sea Haven Industries CO ID:1811679038 CCD PMT INFO:Alliance Sanitation LLC 21222000280",
+  });
+  assert.equal(c.event, "ach_debit");
+  assert.equal(c.pmtId, "7854980");
+  assert.equal(c.embeddedPaymentNumber, "21222000280");
+  assert.equal(c.vendorText, "Alliance Sanitation LLC");
+  assert.equal(c.checkNumber, null);
+});
+
+test("live shape: DES-less 455 is a third-party autopay, ignored not unknown", () => {
+  const c = classifyTransaction({
+    transactionCode: "455",
+    transactionDescription: "Preauthorized ACH Debit",
+    transactionType: "Detail",
+    amount: "1850",
+    creditDebitIndicator: "Debit",
+    customerReference: "000000000000",
+    detailText: "SOME UTILITY CO DES:AUTOPAY ID:12345 INDN:Sea Haven Industries CO ID:999 WEB",
+  });
+  assert.equal(c.event, "ignored");
+});
+
+test("live shape: 255 return credit maps to check_return with number from ref", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-02-20",
+    transactionCode: "255",
+    transactionDescription: "Check Posted and Returned CR",
+    transactionType: "Detail",
+    amount: "1892.62",
+    creditDebitIndicator: "Credit",
+    customerReference: "1122200030",
+  });
+  assert.equal(c.event, "check_return");
+  assert.equal(c.checkNumber, "1122200030");
+  assert.equal(c.direction, "credit");
+});
+
+test("live shape: 252 debit reversal credit maps to check_return; text agrees", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-06-16",
+    transactionCode: "252",
+    transactionDescription: "Debit Reversal Credit",
+    transactionType: "Detail",
+    amount: "6932.76",
+    creditDebitIndicator: "Credit",
+    customerReference: "001122200802",
+    detailText: "061626 RETURN OF POSTED CHECK / ITEM (RECEIVED ON 06-16) CHECK #1122200802",
+  });
+  assert.equal(c.event, "check_return");
+  assert.equal(c.checkNumber, "1122200802");
+});
+
+test("live shape: 266 with electronic-return text stays electronic_return, no fabricated check number", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-06-16",
+    transactionCode: "266",
+    transactionDescription: "Return Item Credit",
+    transactionType: "Detail",
+    amount: "1555.13",
+    creditDebitIndicator: "Credit",
+    customerReference: "000000000000",
+    detailText: "061626 RETURN OF POSTED CHECK / ITEM (RECEIVED ON 06-16) ELECTRONIC TRANSACTION",
+  });
+  assert.equal(c.event, "electronic_return");
+  assert.equal(c.checkNumber, null);
+});
+
+test("266: ACH PMT text wins over the electronic_return fallback", () => {
+  const c = classifyTransaction({
+    transactionCode: "266",
+    transactionType: "Detail",
+    amount: "4364.95",
+    creditDebitIndicator: "Credit",
+    customerReference: "000000000000",
+    detailText:
+      "REDDI SERVICES DES:PAYMENTS ID:PMT 7712345 INDN:Sea Haven Industries CO ID:1811679038 CCD PMT INFO:Reddi Services 21222000211",
+  });
+  assert.equal(c.event, "ach_return");
+  assert.equal(c.pmtId, "7712345");
+});
+
+test("266: bare row (code label only, no detailText) falls back to electronic_return", () => {
+  const c = classifyTransaction({
+    transactionCode: "266",
+    transactionDescription: "Return Item Credit",
+    transactionType: "Detail",
+    amount: "360.00",
+    creditDebitIndicator: "Credit",
+    customerReference: "000000000000",
+  });
+  assert.equal(c.event, "electronic_return");
+  assert.equal(c.checkNumber, null);
+});
+
+test("266: substantive text matching no classifier stays loud as unknown, never a write event", () => {
+  // Security review F1: a write-capable fallback must not fire on a row the
+  // classifiers could not read — amount-only Returned writes were reachable.
+  const c = classifyTransaction({
+    transactionCode: "266",
+    transactionDescription: "Return Item Credit",
+    transactionType: "Detail",
+    amount: "360.00",
+    creditDebitIndicator: "Credit",
+    customerReference: "000000000000",
+    detailText: "DEPOSITED ITEM RETURNED 12345",
+  });
+  assert.equal(c.event, "unknown");
+  assert.equal(c.checkShaped, true);
+});
+
+test("live-format return text with leading MMDDYY token classifies via regex", () => {
+  // Security review F2: the anchors must accept the live detailText prefix.
+  const c = classifyTransaction({
+    transactionCode: "699",
+    creditDebitIndicator: "Credit",
+    amount: "6932.76",
+    detailText: "061626 RETURN OF POSTED CHECK / ITEM (RECEIVED ON 06-16) CHECK #1122200802",
+  });
+  assert.equal(c.event, "check_return");
+  assert.equal(c.checkNumber, "1122200802");
+  const e = classifyTransaction({
+    transactionCode: "699",
+    creditDebitIndicator: "Credit",
+    amount: "360.00",
+    detailText: "061626 RETURN OF POSTED CHECK / ITEM (RECEIVED ON 06-16) ELECTRONIC TRANSACTION",
+  });
+  assert.equal(e.event, "electronic_return");
+});
+
+test("unmapped code with all-zeros reference stays unknown, not silently ignored", () => {
+  // Security review F4: the zero-guard must not remove the shape signal.
+  const c = classifyTransaction({
+    transactionCode: "275",
+    transactionType: "Detail",
+    creditDebitIndicator: "Credit",
+    customerReference: "000000000000",
+    amount: "4364.95",
+    detailText: "VENDOR DES:REVERSAL ID:123 CCD",
+  });
+  assert.equal(c.event, "unknown");
+  assert.equal(c.checkNumber, null);
+});
+
+test("reference fields are length-bounded", () => {
+  const c = classifyTransaction({
+    transactionCode: "475",
+    customerReference: "9".repeat(500),
+    bankReference: "8".repeat(500),
+    amount: "1.00",
+  });
+  assert.ok(c.checkNumber.length <= 64);
+  assert.ok(c.bankReference.length <= 64);
+});
+
+test("zero-reference guard: all-zeros customerReference never becomes check number 0", () => {
+  for (const ref of ["0", "0000", "000000000000"]) {
+    const c = classifyTransaction({
+      transactionCode: "255",
+      transactionType: "Detail",
+      amount: "100",
+      creditDebitIndicator: "Credit",
+      customerReference: ref,
+    });
+    assert.equal(c.checkNumber, null, `ref ${ref}`);
+    assert.equal(c.customerReference, "");
+  }
+});
+
+test("summary rows classify as summary before any text matching", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-07-22",
+    transactionCode: "470",
+    transactionDescription: "Total Checks Paid Debit",
+    transactionType: "Summary",
+    amount: "4547.62",
+  });
+  assert.equal(c.event, "summary");
+});
+
+test("noise codes are ignored even when check-shaped", () => {
+  for (const [code, desc] of [
+    ["170", "Total Other Check Deposits CR"],
+    ["201", "Individual Auto Transfer CR"],
+    ["470", "Total Checks Paid Debit"],
+    ["481", "Individual Loan Payment Debit"],
+  ]) {
+    const c = classifyTransaction({
+      transactionCode: code,
+      transactionDescription: desc,
+      transactionType: "Detail",
+      amount: "100",
+      customerReference: "197",
+    });
+    assert.equal(c.event, "ignored", `code ${code}`);
+  }
+});
+
+test("live shape: 475 check paid has no detailText; number rides in customerReference", () => {
+  const c = classifyTransaction({
+    asOfDate: "2026-06-16",
+    transactionCode: "475",
+    transactionDescription: "Check Paid",
+    transactionType: "Detail",
+    amount: "3350.00",
+    creditDebitIndicator: "Debit",
+    customerReference: "0001122200236",
+    bankReference: "813312345",
+  });
+  assert.equal(c.event, "check_paid");
+  assert.equal(c.checkNumber, "1122200236");
+});
+
+test("legacy statement-text fixtures still classify via the text fallback", () => {
+  const c = classifyTransaction({
+    text: "ARP RETURNED CHECK REFER TO MAKER CHECK # 1122200030 PAID DATE 02/19/26",
+    amount: "1,892.62",
+    transactionCode: "354",
+  });
+  assert.equal(c.event, "check_return");
+  assert.equal(c.checkNumber, "1122200030");
+});
+
+test("empty-string detailText does not shadow populated text (substantive chain)", () => {
+  // Open SWE review: ?? alone would let detailText:"" hide the statement text.
+  const c = classifyTransaction({
+    transactionCode: "699",
+    detailText: "",
+    text: "ARP RETURNED CHECK REFER TO MAKER CHECK # 1122200030 PAID DATE 02/19/26",
+    amount: "1,892.62",
+  });
+  assert.equal(c.event, "check_return");
+  assert.equal(c.checkNumber, "1122200030");
+});
diff --git a/tests/postingDate.test.js b/tests/postingDate.test.js
new file mode 100644
index 0000000..37e800a
--- /dev/null
+++ b/tests/postingDate.test.js
@@ -0,0 +1,27 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { postingDate } from "../src/fetchBoaTransactions.js";
+
+test("postingDate: ISO asOfDate passes; valueDate is the fallback", () => {
+  assert.equal(postingDate({ asOfDate: "2026-07-22" }), "2026-07-22");
+  assert.equal(postingDate({ valueDate: "2026-07-21" }), "2026-07-21");
+});
+
+test("postingDate: non-ISO capture formats normalize", () => {
+  assert.equal(postingDate({ asOfDate: "7/21/2026" }), "2026-07-21");
+});
+
+test("postingDate: implausible years reject to null (epoch artifacts, far future)", () => {
+  // Security review INJ-002: "12/31/69" would become 2069 via the 2-digit
+  // fallback and permanently noop later real events on that record.
+  assert.equal(postingDate({ asOfDate: "12/31/69" }), null);
+  assert.equal(postingDate({ asOfDate: "9999-12-31" }), null);
+  assert.equal(postingDate({ asOfDate: "1901-01-01" }), null);
+  assert.equal(postingDate({ asOfDate: "garbage" }), null);
+  assert.equal(postingDate({}), null);
+});
+
+test("postingDate: empty-string asOfDate falls through to valueDate", () => {
+  // Open SWE review: ?? alone would return "" and reject the row.
+  assert.equal(postingDate({ asOfDate: "", valueDate: "2026-07-21" }), "2026-07-21");
+});