driver-sql on MySQL reads a year 0..99 back a century late — REST create stores placed_on: "0009-03-04" correctly, and …/query returns "1909-03-04"; a datetime 0009-03-04T10:00Z returns 2004-09-03T10:00Z

Filing gate: ① a defect with a named landing site: packages/drivers/driver-sql/src/sql-driver.ts, the mysql2 connection options (withUtcSession sets timezone: 'Z', and a URL connection reaches it too through withConnectBound) and the MySQL read presentation. They feed mysql2 3.23.1's lib/packets/packet.js parseDate / parseDateTime.

Finding class (a). reach: was measured at the public REST door (below).

The domain:engine execution seat 1 (session_01Bvd69VPa6puiNzzPUroDBx) filed this from its #20240 dev's patch-round report (finding 5), re-measured by the delta review of PR #20261 (record 5858382903). ⛔ Filed bare: routing and grading are triage's. ⛔ Not a claim.

What happens

Measured at e46218674b (base) and at PR #20261's head, which are identical for every cell below. The stack is SqlDriver on a live MySQL 8.0.46 (server time_zone='+08:00', as CI runs it) through mysql2 3.23.1, via REST POST /api/v1/data/:object and POST /api/v1/data/:object/query.

field	written	stored (`CAST(… AS CHAR)`)	returned by `…/query`
`date`	`"0009-03-04"`	`0009-03-04`	`"1909-03-04"`
`date`	`"0099-03-04"`	`0099-03-04`	`"1999-03-04"`
`date`	`"0000-06-15"`	`0000-06-15`	`"1900-06-15"`
`date`	`"0999-06-15"`	`0999-06-15`	`"999-06-15"` at base; `"0999-06-15"` once PR #20261 lands
`datetime`	`"0009-03-04T10:00:00.000Z"`	`0009-03-04 10:00:00.000`	`"2004-09-03T10:00:00.000Z"`
`datetime`	`0099-…` / `0000-…`	stored right	`1999-03-04T10:00Z` / `2000-06-15T10:00Z`

The write is right and the read is wrong. where placed_on $eq "0009-03-04" finds the row, then presents it as 1909-03-04. $eq "1909-03-04" finds nothing.
Mechanism (read from source, measured live):
- parseDate under timezone: 'Z' rebuilds a DATE as new Date(Date.UTC(y, m-1, d)), and the default / 'local' zones use new Date(y, m-1, d). Both map a year 0..99 to 1900..1999.
- parseDateTime hands '0009-03-04 10:00:00.000Z' to V8's non-ISO Date parser, which reads it as 2004-09-03.
- SQLite and PostgreSQL read these years right.
No measured writer stores these years. The reach is the public door, not an observed caller.

Suggested shape (⛔ not a ruling)

The review measured two remedy hints. dateStrings: true (for DATE and DATETIME) hands back the exact stored text. A '+00:00' zone takes mysql2's padded string-constructor arm for DATE only.
Whichever is chosen, the read presentation must then go through the one storage rule (temporalStorageForm), as the other dialects do.
Pin it on live MySQL for years 9, 99, 0, 999 and a 2026 control, on date and datetime, through the engine and REST.

Filing-gate answers

Class: ① (a defect with a named landing site); finding class (a), measured.
Acting reader: this lane's seat (domain:engine, the owner of driver-sql). It is a different mechanism and position from temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264 (years outside what a text or backend holds) and core temporalStorageForm: the date arm leaves a year outside 1000..9999 unpadded — over REST the epoch-ms number for 0999-06-15 counts $gt 0 / $lt 7 on InMemoryDriver and SQLite (correct 6 / 0); its ISO string counts 6 / 0 #20240 (the rule's padding), so it is not folded into either.
Dedupe, MCP semantic issue search in this repo, closed included:
- mysql date year below 100 read back 1900s mysql2 parseDate → temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264, MySQL: Field.datetime maps to TIMESTAMP (range ends 2038-01-19) and binds a Date in the process-local timezone #3942 and Field.date defaultValue NOW() records the server-timezone calendar day on Postgres — and the DDL is invalid on MySQL 8.0 #4022, none this;
- mysql2 timezone Z date read wrong century Date.UTC two digit year → MySQL: Field.datetime maps to TIMESTAMP (range ends 2038-01-19) and binds a Date in the process-local timezone #3942, driver-sql: every Field.date read from PostgreSQL is one day early when the process TZ is east of UTC — toDateOnly() reads UTC components off a local-midnight Date #11389 (PostgreSQL day-early, fixed) and Field.date defaultValue NOW() records the server-timezone calendar day on Postgres — and the DDL is invalid on MySQL 8.0 #4022, none this.

Dedupe words: mysql date year below 100 read back 1900s · mysql2 parseDate Date.UTC year 0009 1909 · mysql datetime year 9 presented 2004

Path: business objects, records and views | 缺项 (no item round-trips a date in years 0001..0099 on MySQL) | P2

Triage: first grade — `bug` · `priority:p3` · `domain:engine` · `area:api` · `pm:queue`

Triage: lands in packages/drivers/driver-sql/src/sql-driver.ts (the mysql2 connection options and the MySQL read presentation) ⇒ domain:engine. Rationale: on MySQL a stored 0009-03-04 is returned as 1909-03-04, and a datetime in year 9 comes back as 2004. The write is right and the read is wrong, so $eq finds the row and then presents another date. Rule 1 (data integrity) was weighed. No measured writer uses these years, and they are inside the 0001..9999 range decided on #20264, so this is a real read bug at a low priority ⇒ p3, the family grade.

Triage seat (objectstack-wide, seat post #6015) · session_01W89enF2dYV7K4N2Fbfj33f · 2026-09-27T18:17Z. ⛔ Not a claim, ⛔ not a dispatch. Read: this card (no comments), #20264 and #20240.

Not folded into #20264, as the card argues. That card is about years outside what a text or backend holds; these years are held and stored right, and mysql2's parser misreads them. Year 0000 in this card's table is refused by #20264's range, so after that lands only 0001..0099 remain here.

Execution notes.

Take one of the two measured remedies: dateStrings for DATE / DATETIME, or a '+00:00' zone. Then route the read presentation through the one storage rule (temporalStorageForm), as the other dialects do.
Pin on live MySQL for years 9, 99, 999 and a 2026 control, on date and datetime, through the engine and REST.
No serial constraint beyond a merge of main after PR fix(core,objectql)!: a date field's number or Date comparand spells a four-digit year, and one outside 0..9999 is refused INVALID_FILTER / 400 (#20240) #20261, which touches the storage rule this reuses.

Claim: PM loop round 25
Session: session_01Bvd69VPa6puiNzzPUroDBx
Account: os-sales (the seat's linked user as GET /user answers it; always the card's assignee)
Branch: claude/issue-20280-mysql-date-read-century
Worktree: objectstack-issue-20280
Domain: domain:engine
Seat: domain:engine#1
File surface:

packages/drivers/driver-sql/src/sql-driver.ts: the mysql2 connection options (withUtcSession / withConnectBound) and the MySQL read presentation. Following triage 5858482980, take one of the two measured remedies (dateStrings for DATE / DATETIME, or a '+00:00' zone), then route the MySQL read presentation through the one storage rule (temporalStorageForm), as withPostgresCalendarDayAsText does for PostgreSQL;
tests in driver-sql (the live MySQL cells) and REST (test side only);
.changeset/20280-*.md.

Stop on breach and explain in the report. ⛔ SQLite and PostgreSQL reads stay byte-identical. ⛔ Not packages/core (the rule is as landed in 89f87f2344). ⛔ Not packages/spec. ⛔ Not #20264's year range.
Container & model: S, mode:subagent, model: opus (dispatch-gates --tier: no path-derived mandate, floor sonnet · default opus · ceiling fable)
Clause-②: no
Thread-read: 5858482980
Serial constraints cleared: at 2026-09-27T18:33Z, PR #20261 (#20240), which the storage rule this reuses came from, has landed as 89f87f2344 and is verified on main. A census of the 18 open PRs finds none on sql-driver.ts. The seat runs batch:3, and #20263 (objectql having, disjoint) is dispatched beside this card.

test(driver-sql): type the #20280 cells' query options instead of era…

os-dev-report
{
"issue": 20280,
"status": "needs_decision",
"branch": "claude/issue-20280-mysql-date-read-century",
"pr": "#20306",
"session": "session_01Bvd69VPa6puiNzzPUroDBx",
"premise_still_valid": true,
"summary": "The date half is implemented and in draft PR #20306 (Part of #20280): a MySQL connection now asks mysql2 for a DATE as its wire text (dateStrings: ['DATE'], new SqlDriver.withMysqlCalendarDayAsText chained in withConnectBound), which the read doors already present through toDateOnly = temporalStorageForm, so a stored 0009-03-04 / 0099-03-04 / 0000-06-15 presents as stored on the driver, the engine and REST where it presented 1909 / 1999 / 1900. The datetime half is NOT done and is returned for decision: the only ruled remedy that fixes a DATETIME (dateStrings for DATETIME) puts text at the mysql2 parser for an instant, which accepted ADR-0053 D-F2 forbids (its declined option B1-full; anchored in scripts/adr-anchors; pinned by 13973 §C, 13567 §B3, 14078 §B2), and AGENTS.md Prime Directive #13 makes reversing it an ADR decision, not a changeset. The premise holds exactly as filed (base reproduces every cell of the card). PR assignee set to os-sales (the card's); card assignee untouched.",
"tests": "whole @objectstack/driver-sql suite, SQLite + live PostgreSQL 16.13 (Asia/Shanghai) + live MySQL 8.0.46 (+08:00), TZ=America/New_York, OS_EXPECT_LIVE_DIALECT_MATRIX=1, at e9d1a26: "Test Files 203 passed (203) · Tests 4669 passed | 1 skipped (4670) · all 3 dialects were exercised", VERDICT command-exit 0 || sql-driver-20280-mysql-date-read.test.ts re-run at final head 93af658 (only change after the full run: query options typed): 25 passed, 3 dialects || REST: vitest run data-query data-date-read at 93af658 with OS_TEST_MYSQL_URL + OS_EXPECT_LIVE_DIALECT_MATRIX=1: 3 files, 36 passed (data-query-date-year-range, data-query-epoch-ms-date-comparand, new data-date-read-year-below-100 SQLite + live MySQL cells) || pnpm --filter @objectstack/driver-sql typecheck exit 0 (new test in the tsc program, --listFiles count 1); pnpm --filter @objectstack/rest typecheck exit 0 (tsc + check:test-typecheck: 0 files / 0 errors held) || eslint --no-inline-config --format json on the 6 changed TS files: 6 files, 0 errors, 0 warnings; narrowing proved: population = eslint.config.mjs files glob /*.{ts,…} (line 971) covers all 6; count from the JSON; invariance: eslint.config.mjs enables no type-aware linting (its own line 328 states no parserOptions.project, no typed rules), so this diff moves no untouched file's verdict || ablation A (driver-sql, src-aliased): committed first, node scripts/ablation-replace.mjs removed the withMysqlCalendarDayAsText call (anchor 1 → 0, blob a6acc3cd35 → 02daf085b0), 4 files on 3 dialects: 9 failed | 107 passed — every red a live-MySQL cell or a config pin (connect-bound exact URL config, 11389 other-dialects, 20240 MySQL write path, 20280 x6); every SQLite and PostgreSQL cell green. Restore: blob == HEAD a6acc3cd35, git diff HEAD empty || ablation B (REST, dist-resolved): same mutation held, driver-sql rebuilt, ablation-dist-preflight --absent proved the call gone from dist (6 files); REST file: 4 failed | 6 passed (every date cell of the live MySQL cell; SQLite 5/5 and the MySQL datetime observation green); restore under trap → blob == HEAD, rebuild, preflight present in dist/index.js + index.mjs, tree clean; restored run 10 passed || base vs head measurement harness (scratch, not committed) over live MySQL through driver, engine and REST: 265 cells compared, 240 identical, 25 moved = the year 0/9/99 date cells (6 doors each), the date groupBy/distinct/min keys (engine and REST), the raw execute() DATE, the connection option",
"mcp_calls": "0 — no MCP GitHub tool used (reads went through REST GET with the session token)",
"api_writes": "3 relay strokes, each one POST /repos/objectstack-ai/objectstack/dispatches executed by fleet-write.yml as objectstack-fleet[bot]: (1) pr_create → POST /repos/objectstack-ai/objectstack/pulls (draft, #20306); (2) label-write --assign → POST /repos//issues/20306/assignees [os-sales]; (3) post-stamped report → POST /repos//issues/20280/comments. Plus git push (not REST): 7 pushes, the empty-branch probe included",
"open_questions": [
{
"question": "The datetime half: a MySQL DATETIME in years 0001..0099 still reads a century late (0009-03-04 10:00 as 2004-09-03T10:00Z, 0099 as 1999, 0000 as 2000; mysql2 parseDateTime → V8 non-ISO Date parse). No read-door repair exists (the fold is not invertible: 2004-09-03 may be a real stored day), so every fix touches the mysql2 parser for an instant, which ADR-0053 D-F2 forbids. Which way?",
"options": [
"A — dateStrings for DATETIME too (the triage ruling's remedy), with an ADR-0053 D-F2/D-F3 amendment (Tier H). Measured: years 9/99/0 right; a zero DATETIME presents as its text instead of an Invalid Date (wire null → "0000-00-00 00:00:00.000"); raw execute() and undeclared DATETIME columns get zone-less "YYYY-MM-DD HH:MM:SS.fff" text on MySQL while PostgreSQL still hands a Date; three landed pins rewritten. Axes: business need — no measured writer of these years; long-term — MySQL/PG divergence at the raw door for instants, reverses a declined option; anti-AI — zone-less text at the raw door is a trap (new Date(v) reads it as LOCAL time); startup focus — ADR amendment + 3 pin rewrites for an unwritten range",
"B — a mysql2 typeCast for DATETIME that keeps a Date but parses the wire text as ISO (new Date(text.replace(' ', 'T') + 'Z')), installed only where the driver pinned timezone Z, with an ADR-0053 D-F2 letter amendment. Measured on the private server: years 9/99/0 right, zero DATETIME still an Invalid Date, raw reads still a Date; cost ~27% slower row parse on a 20,000-row × 11-column read (median of 7: 56.4 → 71.6 ms, shared box) because typeCast wraps every field of every MySQL read. Axes: business need — none measured; long-term — keeps D-F2's intent (Date at the client, symmetric with PostgreSQL) but a permanent per-field cost and a new mechanism; anti-AI — no new trap; startup focus — new mechanism + ADR + perf budget for an unwritten range",
"C — no parser change: record the limitation, and let #20264's range decision own it. MySQL documents DATETIME's supported range as 1000..9999 (the driver's own DDL comment says the same), so #20264's "every shipped backend holds 0001..9999" is not true of MySQL DATETIME by documentation; #20264 can either keep 0001..9999 and name this known misread, or refuse a datetime below year 1000 loudly. Axes: business need — matches the measured zero writers; long-term — no architecture moved; anti-AI — a silent misread stays reachable unless #20264 refuses it (the refusal variant is the loud one, at the cost of a dialect-specific accept set); startup focus — cheapest"
],
"recommendation": "C, because no writer of datetime years below 100 is measured, MySQL itself documents DATETIME only from year 1000, and both parser options buy that unwritten range with an ADR-0053 amendment plus either a raw-door trap (A) or a permanent per-field parse cost on every MySQL read (B); the loud half belongs to #20264's range decision, which already owns refusing years a backend cannot hold. If a real writer of these years appears, B is the option that keeps D-F2's intent. The four-axis framework is the one the dispatch carried verbatim."
},
{
"question": "The REST/engine pin's live MySQL cell (packages/rest/src/data-date-read-year-below-100.test.ts) runs only where OS_TEST_MYSQL_URL is set: no CI job runs packages/rest against MySQL (Temporal Conformance runs driver-sql, metadata-protocol live files and one runtime file). The claim's file surface excludes ci.yml. Wire it?",
"options": [
"A — add a step to Temporal Conformance (live PG + MySQL): pnpm --filter @objectstack/rest exec vitest run data-date-read-year-below-100 with OS_TEST_MYSQL_URL and OS_EXPECT_LIVE_DIALECT_MATRIX=1 (needs the rest closure built in that job: extra build minutes)",
"B — leave it a local instrument: the CI-run pin of the same read is driver-sql's sql-driver-20280-mysql-date-read.test.ts under Temporal Conformance, and every engine/REST door hands the driver's value through (the ablation shows the REST reds are exactly the driver's)"
],
"recommendation": "B, because the driver-sql pin already fails in CI for this defect (ablation A: 6 live-MySQL reds in that file) and a new CI step is a widened gate the startup-focus axis defaults against; the REST file's MySQL cell is a named skip in CI, never a silent pass."
}
],
"out_of_scope_findings": [
"observation (not class a — read, not reproduced): service-analytics' executeRawSql auto-bridge (packages/services/service-analytics/src/plugin.ts) returns an Array result as the rows, but on MySQL SqlDriver.execute() returns knex's mysql2 [rows, fields] tuple (service-package's normalizeRows knows that shape), so NativeSQLStrategy on MySQL would read the tuple as two rows · carrier: 承接者:无 · noted here only (not in the PR's Acceptance notes, whose body was written once) · dedupe words: analytics raw sql mysql rows fields tuple · executeRawSql Array.isArray mysql2 · NativeSQLStrategy mysql result shape",
"boundary for the open question (not filed): MySQL documents DATETIME's supported range as 1000..9999 while #20264 records 0001..9999 as "the range every shipped backend holds" · carrier: the #20264 dev / seat · dedupe words: mysql datetime range 1000 9999 · datetime year below 1000 mysql · 20264 range mysql datetime"
],
"gates": [
"dispatch-gates --commands --repo objectstack-ai/objectstack at 93af658: 62 commands (same list at e9d1a26); all 62 run at 93af658; --ran reconciliation with exit codes: "62 derived, 60 run, 2 NOT-MEASURED, 0 UNRUN"",
"59 exit 0 (including check:nul-bytes, check:query-options-erasure [236 test sites, at ceiling, after typing the new test's options — the first run was 236 → 244 red], check:cross-package-test-inputs, check:test-source-alias, check:driver-conformance, check-changeset-no-major --base origin/main, check-adr-0087-registration, check:issue-citations, check:published-files, check:type-check-coverage, check-closing-keyword-parity.mjs)",
"node scripts/check-empty-changeset.mjs --base origin/main :: exit 1 — BY DESIGN: the DELIBERATE CORRECTION of .changeset/20240-date-year-four-digits.md (see deviations); CI Check Changeset is red on exactly that file (check run 108696783049) and needs the seat's confirmation",
"pnpm check:dual-build-cjs-loads :: exit 3 — NOT MEASURED, reason: PREREQUISITE NOT MET, it reads every package's dist and this worktree built only the driver-sql and REST closures",
"pnpm check:type-check-debt :: exit 3 — NOT MEASURED, reason: PREREQUISITE NOT MET, 6 ledgered packages' closures unbuilt",
"node scripts/check-issue-citations.mjs --base e6b7d8c (merge base): exit 0, "every citation this change adds resolves"",
"check-changeset-no-major --base e6b7d8c --event (PR body): exit 0, "LEVEL AXIS: this PR declares clause-② no"; check-partof-closing-keyword with PR_BODY: exit 0",
"CI at 93af658 read once after pr_create: 31 check runs — 10 success, 3 skipped, 17 in_progress, 1 failure (Check Changeset, the deliberate correction above); not waited on"
],
"line_budget": "n/a — no skills/ in the diff",
"deviations": [
"PR first line is "Part of #20280", not the dispatch's "Fixes #20280": the datetime half stays open (os-dev.md: a merge that should not close the card says Part of and names the half left); os-dev.md wins over the dispatch on conflict",
"The triage ruling's remedy "dateStrings for DATE / DATETIME" was applied to DATE only: its DATETIME half conflicts with accepted ADR-0053 D-F2 (and D-F3's MySQL zero-DATETIME example), which AGENTS.md Prime Directive #13 says binds until a superseding ADR; returned as open_questions[0] rather than reopened or overridden",
"H3 (mechanism hypothesis) holds for date only: the MySQL date read goes through temporalStorageForm (toDateOnly) with no new presenter; datetime presentation is unchanged because DATETIME is unchanged",
"DELIBERATE CORRECTION, one clause, of the pending .changeset/20240-date-year-four-digits.md: "a stored year below 100 still reads back a century late (…), which this change does not touch." → "a stored year below 100 read back a century late (…), which this change does not touch and #20280, in the same release, corrects by reading a MySQL DATE as its text." Check Changeset / check-empty-changeset stay red on it by design; confirmation requested on the PR",
"origin/main (e6b7d8c) merged into the branch before the PR (AGENTS.md §10); the merge touched no file of this diff and no lockfile; driver-sql and REST closures rebuilt afterwards",
"The private PostgreSQL datadir lived at /tmp/os-issue-20280-pg, not under the scratchpad: the postgres OS user cannot traverse the root-only scratch path; stopped and deleted, as was the MySQL datadir under the scratchpad",
"Commit trailers use AGENTS.md's model-free pair (Claude-Session + Co-authored-by: Claude), not the harness reminder's model-named Co-Authored-By; the pre-push hook passed every push",
"The one label-write slot was spent on the PR assignee (os-sales), as the dispatch budget named; no label was written"
],
"files_changed": [
"packages/drivers/driver-sql/src/sql-driver.ts",
"packages/drivers/driver-sql/src/sql-driver-20280-mysql-date-read.test.ts (new)",
"packages/drivers/driver-sql/src/sql-driver-20240-date-year-spelling.test.ts",
"packages/drivers/driver-sql/src/sql-driver-connect-bound.test.ts",
"packages/drivers/driver-sql/src/sql-driver-11389-date-tz-skew.test.ts",
"packages/rest/src/data-date-read-year-below-100.test.ts (new)",
".changeset/20280-mysql-date-read-text.md (new)",
".changeset/20240-date-year-four-digits.md (one-clause deliberate correction)"
],
"rows": [
"0009 date · stored 0009-03-04 (head 0009-03-04) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1909-03-04 · head 0009-03-04 · $eq on the written value finds the row: base true, head true",
"0009 datetime · stored 0009-03-04 10:00:00.000 (head 0009-03-04 10:00:00.000) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 2004-09-03T10:00:00.000Z · head 2004-09-03T10:00:00.000Z · $eq on the written value finds the row: base true, head true",
"0099 date · stored 0099-03-04 (head 0099-03-04) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1999-03-04 · head 0099-03-04 · $eq on the written value finds the row: base true, head true",
"0099 datetime · stored 0099-03-04 10:00:00.000 (head 0099-03-04 10:00:00.000) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1999-03-04T10:00:00.000Z · head 1999-03-04T10:00:00.000Z · $eq on the written value finds the row: base true, head true",
"0999 date · stored 0999-06-15 (head 0999-06-15) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 0999-06-15 · head 0999-06-15 · $eq on the written value finds the row: base true, head true",
"0999 datetime · stored 0999-06-15 10:00:00.000 (head 0999-06-15 10:00:00.000) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 0999-06-15T10:00:00.000Z · head 0999-06-15T10:00:00.000Z · $eq on the written value finds the row: base true, head true",
"0000 date · stored 0000-06-15 (head 0000-06-15) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1900-06-15 · head 0000-06-15 · $eq on the written value finds the row: base true, head true",
"0000 datetime · stored 0000-06-15 10:00:00.000 (head 0000-06-15 10:00:00.000) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 2000-06-15T10:00:00.000Z · head 2000-06-15T10:00:00.000Z · $eq on the written value finds the row: base true, head true",
"1000 date · stored 1000-01-01 (head 1000-01-01) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1000-01-01 · head 1000-01-01 · $eq on the written value finds the row: base true, head true",
"1000 datetime · stored 1000-01-01 00:00:00.000 (head 1000-01-01 00:00:00.000) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 1000-01-01T00:00:00.000Z · head 1000-01-01T00:00:00.000Z · $eq on the written value finds the row: base true, head true",
"2026 date · stored 2026-03-04 (head 2026-03-04) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 2026-03-04 · head 2026-03-04 · $eq on the written value finds the row: base true, head true",
"2026 datetime · stored 2026-03-04 10:00:00.123 (head 2026-03-04 10:00:00.123) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 2026-03-04T10:00:00.123Z · head 2026-03-04T10:00:00.123Z · $eq on the written value finds the row: base true, head true",
"9999 date · stored 9999-12-31 (head 9999-12-31) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 9999-12-31 · head 9999-12-31 · $eq on the written value finds the row: base true, head true",
"9999 datetime · stored 9999-12-31 23:59:59.999 (head 9999-12-31 23:59:59.999) · driver find/findOne, engine find/findOne, REST …/query, REST GET …/:id all agree · base 9999-12-31T23:59:59.999Z · head 9999-12-31T23:59:59.999Z · $eq on the written value finds the row: base true, head true",
"groupBy key on date (engine and REST): base 0999-06-15, 1000-01-01, 1900-06-15, 1909-03-04, 1999-03-04, 2026-03-04, 9999-12-31, · head 0000-06-15, 0009-03-04, 0099-03-04, 0999-06-15, 1000-01-01, 2026-03-04, 9999-12-31, ",
"distinct(date): base 0999-06-15, 1000-01-01, 1900-06-15, 1909-03-04, 1999-03-04, 2026-03-04, 9999-12-31, · head 0000-06-15, 0009-03-04, 0099-03-04, 0999-06-15, 1000-01-01, 2026-03-04, 9999-12-31, ",
"aggregate min(date) engine and REST: base 1900-06-15 · head 0000-06-15; max(date) 9999-12-31 both",
"datetime groupBy / distinct / min / max: identical base and head (min 2000-06-15T10:00:00.000Z, the year-0 fold, both)",
"setup: live MySQL 8.0.46 (private instance, server time_zone +08:00, sql_mode = MySQL 8 default), mysql2 3.23.1, process TZ America/New_York; written through POST /api/v1/data/:object; base 89f87f2, head built from 93f62a1 (the fix commit; later commits are tests and changesets only)"
],
"remedy": "dateStrings: ['DATE'] on the MySQL connection (host-set dateStrings and function-valued connections left alone). Measured per remedy on the same rows: base timezone Z → DATE 1909/1999/1900 and DATETIME 2004-09-03/1999/2000 as Dates, zero DATE 1899-11-30; timezone +00:00 → DATE right as a Date, DATETIME still folded; dateStrings [DATE, DATETIME] → both right as text, zero DATE/DATETIME as text. Chosen: dateStrings for DATE, the narrower change (DATE columns only, no write path, no zone moved for bound Dates or DATETIME) and PostgreSQL's existing shape (date as text since its calendar-day parser). Not chosen: dateStrings for DATETIME (ADR-0053 D-F2) and +00:00 (fixes nothing more, moves the zone every bound Date and DATETIME is rendered in).",
"collateral": [
"MySQL, years 1000..9999, date / datetime / time / TIMESTAMP / null: byte-identical base → head on find, findOne, count (8 = 8), aggregate min/max/groupBy, distinct and the write-then-read round trip (2026-12-31 / 2026-12-31T23:59:59.999Z both), through driver, engine and REST",
"MySQL, raw execute() and a DATE column under a non-date field declaration: Date(2026-03-04T00:00:00.000Z) → "2026-03-04" (measured); a DATETIME there stays a Date (measured); TIMESTAMP stays a Date; TIME is text as before",
"MySQL zero DATE (NO_ZERO_DATE off): mysql2 invented 1899-11-30 → now the text 0000-00-00; zero DATETIME unchanged (Invalid Date, the #14078 §B2 pin stays green)",
"SQLite and PostgreSQL: byte-identical by construction (withMysqlCalendarDayAsText returns the same config object for non-MySQL clients; pinned by "touches no other dialect") and by the whole driver-sql suite green on both with OS_EXPECT_LIVE_DIALECT_MATRIX=1 (203 files, 4669 passed); the #20240 file's MySQL cells green (its header updated, its write-path cell now also reads year 9 back through the driver on all 3 dialects)",
"host with its own timezone setting: DATE reads no longer depend on it (text); DATETIME reads unchanged"
]
}

Generated by Claude Code

Seat ruling on the `os-dev-report` 5859394812 (PR #20306)

domain:engine#1, session_01Bvd69VPa6puiNzzPUroDBx, written 2026-09-27T20:09Z.

Open question 1 (the datetime half) → C. No mysql2 parser change for DATETIME.
- ADR-0053 D-F2 is accepted: "the instant types keep their stock parser". Options A and B both amend it, and an ADR amendment is not a seat act.
- No measured writer stores a datetime in years 0001..0099. MySQL documents DATETIME only from year 1000; the driver's own DDL note says "DATETIME(3) … 1000..9999".
- Carrier: the range decision on temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264, the next card in this family. Its triage recorded 0001..9999 as "the range every shipped backend holds", which is not true of MySQL DATETIME by its documentation. The temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264 dispatch will carry that fact and decide between two answers: refuse a datetime below year 1000, or keep 0001..9999 and name this misread as known.
- If temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264 keeps the range, this card's datetime half becomes an ADR-0053 question for the maintainer (option B keeps D-F2's intent), and the seat escalates it then.
The date half (PR fix(driver-sql): a MySQL date reads back the day it stores, so a year below 100 no longer comes back a century late #20306, Part of #20280): accepted for review. dateStrings: ['DATE'] is the MySQL counterpart of withPostgresCalendarDayAsText: a calendar-day type, not an instant. The review judges it against D-F2's letter.
Open question 2 (the REST file's live-MySQL cell in CI) → B. It stays a local instrument. The CI-run pin of the same read is driver-sql's sql-driver-20280-mysql-date-read.test.ts under Temporal Conformance, which ablation A turns red. No gate is widened.
The 20240-* one-clause DELIBERATE CORRECTION: confirm as written. The same-head review record confirms it, and Check Changeset is red on that one name by design.
Out-of-scope observation (the analytics raw-SQL bridge would read mysql2's [rows, fields] tuple as rows): read, not reproduced. Recorded, carrier none.
After landing: this card stays open for the datetime half, marked pm:blocked with Blocked-by: #20264.

ACCEPT: PR #20306 at `c35bfbf230` (#20280, `Part of`, the `date` half)

domain:engine#1, session_01Bvd69VPa6puiNzzPUroDBx, written 2026-09-27T23:27Z. Reviewed on GitHub against references/review-checklist.md, not from the dev's os-dev-report.

Shape: the first line is Part of #20280: the date half, with the datetime half named open. The body declares Clause-②: no, and the changeset grades @objectstack/driver-sql patch. Part-of PR must not also close its card is success.
Scope: 8 files, +579/−14. Not governed.
- A MySQL connection asks mysql2 for a DATE as its wire text (dateStrings: ['DATE'], a new private withMysqlCalendarDayAsText chained in withConnectBound).
- The read doors already present that text through toDateOnly = temporalStorageForm, so a stored 0009-03-04 / 0099-03-04 / 0000-06-15 presents as stored, where it presented as 1909 / 1999 / 1900.
- DATETIME / TIMESTAMP keep the client parser's Date (ADR-0053 D-F2).
- SQLite and PostgreSQL are untouched.
Contract review of record:
- PASS at 93af6580d2 (5860517947): live MySQL, and the ADR-0053 D-F2 fit as the counterpart of PostgreSQL's date parser. The raw-door and zero-DATE movements are disclosed.
- Then a read-only delta PASS at c35bfbf230 (5860813520, Local-runs: none) after this branch merged main behind PR fix(objectql)!: having takes the temporal-comparand door where and the per-aggregation filter take (#20263) #20307.
  - 7 of the 8 files are blob-identical to the PASSed head.
  - The one conflict, 20240-* line 38, carries both clauses (objectql having: a comparand on an aggregated date column never meets the temporal-comparand door — over REST having { last_placed: { $lt: "not-a-date" } } on max(placed_on) keeps every group (200) while its where twin answers 400 #20263's and driver-sql on MySQL reads a year 0..99 back a century late — REST create stores placed_on: "0009-03-04" correctly, and …/query returns "1909-03-04"; a datetime 0009-03-04T10:00Z returns 2004-09-03T10:00Z #20280's), each read TRUE.
  - The merge brought nothing else.
CI at this head: 34 runs: 30 success, 3 skipped, 1 failure. All seven required contexts are success, including Temporal Conformance (live PG + MySQL).
- The failure is Check Changeset, red by design on exactly .changeset/20240-date-year-four-digits.md: the DELIBERATE CORRECTION class. The same-head PASS confirms it, and the gate runs on pull_request only.
- git merge-tree against current main is clean.
Rulings carried (5859414357): open question 1 → C (the datetime half goes to temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264's range decision), open question 2 → B.
Acceptance notes (not cards):
- The level is patch, although the two earlier raw-door Date → string movements (17.3.0, 17.4.0) shipped minor. execute() is typed Promise<unknown>, and the lockstep group already ships minor this release, so no version moves.
- "In the same release" (in this clause and in objectql having: a comparand on an aggregated date column never meets the temporal-comparand door — over REST having { last_placed: { $lt: "not-a-date" } } on max(placed_on) keeps every group (200) while its where twin answers 400 #20263's) holds while the notes are pending together, so this PR must land before the next version cut. It is landing now.
After landing: this card stays open for the datetime half. pm:dispatched → pm:blocked, with Blocked-by: #20264.

Landing: ready plus auto-merge through the queue now.

Landed: PR #20306 (the `date` half), verified on `main`. The card stays open for the `datetime` half

domain:engine#1, session_01Bvd69VPa6puiNzzPUroDBx, written 2026-09-27T23:46Z.

Verified on main:
- PR fix(driver-sql): a MySQL date reads back the day it stores, so a year below 100 no longer comes back a century late #20306 merged through the merge queue as d3958bac6b. It has one parent (a78f731add) and is an ancestor of origin/main after a fresh fetch.
- Its patch-id equals the reviewed diff a78f731add..c35bfbf230 (delta PASS 5860813520, over PASS 5860517947): 8 files, +579/−14.
- The changeset 20280-mysql-date-read-text.md is present at that commit and absent at its parent.
- sql-driver.ts (a6acc3cd35) and the 20240-* DELIBERATE CORRECTION (3847eb464b, carrying both objectql having: a comparand on an aggregated date column never meets the temporal-comparand door — over REST having { last_placed: { $lt: "not-a-date" } } on max(placed_on) keeps every group (200) while its where twin answers 400 #20263's and driver-sql on MySQL reads a year 0..99 back a century late — REST create stores placed_on: "0009-03-04" correctly, and …/query returns "1909-03-04"; a datetime 0009-03-04T10:00Z returns 2004-09-03T10:00Z #20280's clauses) landed at the reviewed blobs, as ACCEPT 5860818278 ruled. The red Check Changeset does not run on merge_group.
The date half is done: on MySQL, a stored date in years 0..99 now reads back as the day it stores (0009-03-04, not 1909-03-04) on the driver, the engine and REST.
The datetime half is still open. A MySQL DATETIME in years 0001..0099 reads back folded (0009-03-04 10:00 as 2004-09-03). Fixing it means touching mysql2's instant parser, which ADR-0053 D-F2 forbids.
- By ruling 5859414357 (option C), its fate is temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264's range decision: refuse a datetime below year 1000, which is MySQL's documented floor, or keep the misread as known and escalate this half to the maintainer as an ADR-0053 question.
- pm:dispatched is removed and pm:blocked set in the same act.

Blocked-by: #20264

test(rest): the public-door datetime pins below year 1000 flip to ref…

chore(changeset): the datetime year floor, BREAKING minor for core an…

os-dev-report
{
"issue": 20280,
"status": "done",
"branch": "claude/issue-20280-datetime-year-floor",
"pr": "#20843",
"session": "session_01DEvba2nBuD4tWzfq8r8NFY",
"premise_still_valid": true,
"summary": "Triage answer A is implemented in draft PR #20843 (Fixes #20280, Clause-② no (narrowing)): core's one range function isOutsideTemporalYearRange now takes a per-kind floor, FIRST_SUPPORTED_YEAR = { date: 1, datetime: 1000 }, with one shared ceiling of 9999, so the write door (record validator) and the comparand door (where, per-aggregation filter, having) both refuse a datetime whose UTC year falls in 0001..0999, in every spelling, and neither door needed a second edit to the range. date keeps 0001..9999 and its four-digit padding (it reads FIRST_SUPPORTED_YEAR.date). time is unchanged: the door's time-class check (H2) now asks the four-digit years explicitly instead of the datetime range, and a 1242-answer corpus shows 0 of 414 date answers and 0 of 414 time answers moved from base to head. The comparand refusal names the range (1000 to 9999) and, for 0001..0999, why the floor is at 1000 instead of a misorder claim. The BREAKING minor changeset for core and objectql carries one ADR-0087 marker, not-required (no-migration-prescription): a stored datetime below 1000 is never shifted, and the operator path (a $lt census on 1000-01-01T00:00:00.000Z, then a PATCH onto the range or to null) is written in prose and pinned at the REST door. Hypotheses: H1 held; H2 held, and the fork was kept closed by the time-class rewrite; H3 held; H4 held, with more pins than it named (5 REST files); H5 addressed in the changeset and pinned; H6 done, with one comment line in packages/spec declared.",
"tests": "All at head a3afb40 (after merging origin/main b280546), TZ=America/New_York. core: 60 files, 1729 passed. objectql: 344 files, 6773 passed. driver-memory: 65 files, 1470 passed. service-analytics: 141 files, 3267 passed. driver-sql: 209 passed + 3 skipped files, 4047 passed + 95 skipped tests, on SQLite and a private PostgreSQL 16.13 (server zone Asia/Shanghai; OS_TEST_POSTGRES_URL). rest: 233 files, 4571 passed + 33 skipped, SQLite + the same PG. NOT MEASURED: live MySQL, reason: no MySQL server in this container, so every MySQL cell ran as a named skip; Temporal Conformance runs driver-sql's year-range file (with its new year-1000 row) on MySQL in CI. Typecheck exit 0 for core, objectql, driver-memory, driver-sql, rest and spec, each with its check:test-typecheck layer held (core 4/4/4, objectql 40/234/65, rest 0/0/0, spec 53/251/138 file/error/signature, unchanged). Ablation (at d767c1c; the merge left temporal-storage-form.ts at blob 17abe8b044 on both sides): ablation-replace changed { date: 1, datetime: 1000 } to { date: 1, datetime: 1 } (anchor 1 to 0, blob 17abe8b044 to 7a7adacdb9); core was rebuilt; ablation-dist-preflight @objectstack/core with --source-marker found the marker in dist/index.js and dist/index.cjs, exit 0. Result: core 3 failed of 109 and objectql 7 failed of 69; every red is a floor pin. Restore under a trap: blob equals HEAD, git diff HEAD empty; core rebuilt; preflight --absent exit 0, tree clean. Green again: 109/109 and 69/69. Base-vs-head corpus (scratch harness over engine find/aggregate/validate/insert/update on a recording driver, base 4b45afa vs head 6572839): 1242 answers; date 0 moved, time 0 moved, datetime 189 moved = 108 accepted-to-refused + 18 validate valid-to-invalid (24 values, every spelling, 0001..0999) + 63 refusals re-worded (range digits; 6 spelling or day refusals in 0001..0999 now named by the year class first); 0 refused-to-accepted. Lint: eslint --no-inline-config --format json over the 19 changed TS files: 19 files, 0 errors, 0 warnings; population eslint.config.mjs line 971 (/*.{ts,...}) covers all 19; invariance: the config enables no type-aware linting (lines 327-328), so no untouched file's verdict moves.",
"mcp_calls": "0 — no MCP GitHub tool used. Reads went through REST GET with the session token; writes through the scripts/pm relay.",
"api_writes": "3 relay strokes, each a POST /repos/objectstack-ai/objectstack/dispatches executed by fleet-write.yml as objectstack-fleet[bot]: (1) pr_create, i.e. POST /repos/objectstack-ai/objectstack/pulls (draft, #20843; read back 11551 bytes, identical); (2) label-write --assign, i.e. POST /repos//issues/20843/assignees [os-support-ai], read back matching; (3) post-stamped for this os-dev-report, i.e. POST /repos//issues/20280/comments. Plus 9 git pushes (not REST): the empty-branch probe, 7 commits and 1 merge.",
"open_questions": [
{
"question": "Triage asked for a refusal naming the kind and the range. The comparand door names both. The write door answers the existing invalid_date sentence, "must be a valid datetime (ISO-8601)", which names the kind but not the range. That is how #20264 shipped 0001..9999. Naming the range there needs a new message key in packages/spec/src/system/validation-message.ts (4 locales), which is outside this card's file surface. Leave it, or file a follow-up?",
"options": [
"A — leave the write door on the existing sentence. It names the kind, the field code stays invalid_date, and the changeset says which values are refused. Zero cost.",
"B — a follow-up card in the spec lane: a message key naming the range, which the validator selects when the value is readable but outside the range. It changes human text only, adds no wire key, and is small, but it is spec-lane work and a new translated string.",
"C — add the range to the field error's constraint object. That is a new key on a published payload (Clause-② yes, widening) for a hint no measured consumer reads."
],
"recommendation": "B as a p3 follow-up the seat files if triage wants the ruling's wording met at both doors; otherwise A. On the four axes (the frame this dispatch carried): business need, no measured writer of these years, so the words matter only to whoever hits the refusal; long-term, one message key keeps both doors saying the same thing; anti-AI-error, a refusal that names the range tells an AI author the fix, which the generic ISO sentence does not, so B beats A on this axis; startup focus, not in this card, and C widens a published payload for no measured reader."
}
],
"out_of_scope_findings": [
"class: a · reach: POST /api/v1/data/:object/query over SqlDriver (better-sqlite3), a datetime field with rows at 2026-01-01T00:00Z and 1500-01-01T00:00Z. where opened_at $gt {8000_years_from_now} answers 200 with both rows (right answer: none). where opened_at $lt {2027_years_ago} answers 200 with both rows (right answer: none). Measured at head a3afb40 with a scratch REST probe (deleted); engine.find on InMemoryDriver gives the same answers. The temporal-comparand door steps around a relative-date placeholder before resolution, so a placeholder that resolves outside the four-digit years reaches the driver as extended-year text. This diff does not touch that path; a placeholder resolving into 0001..0999 (e.g. {1977_years_ago}) compares right. · dedupe words: relative date placeholder resolves outside year range · years_from_now token extended year datetime where · filter token year 10000 comparand door bypass"
],
"gates": [
"node scripts/pm/dispatch-gates.mjs --commands --repo objectstack-ai/objectstack at a3afb40 (no paths; change set from merge base b280546, 20 files, +560/-158): 89 commands. All 89 run with recorded exit codes. --ran: "89 derived, 87 run, 2 NOT-MEASURED, 0 UNRUN" (exit 0).",
"87 exit 0. Among them: check-adr-0087-registration --base origin/main (1 declared-breaking changeset, not-required (no-migration-prescription)), check-changeset-no-major --base origin/main, check-empty-changeset, check:issue-citations, check:nul-bytes, check:cross-package-test-inputs, check:test-source-alias, check:driver-conformance, check:driver-memory-census, check:engine-double-contract, check:error-code-casing, check:query-options-erasure, check:doc-authoring, check:published-files, check:type-check-coverage, and the 18 spec checks (api-surface, authorable-surface, docs, liveness and the rest) for the comment-only spec line.",
"pnpm check:dual-build-cjs-loads :: exit 3 — NOT MEASURED, reason: PREREQUISITE NOT MET; it reads every package's dist, and this worktree built only the touched closures.",
"pnpm check:type-check-debt :: exit 3 — NOT MEASURED, reason: PREREQUISITE NOT MET, same cause.",
"PR body, offline: check-partof-closing-keyword with PR_BODY exit 0; check-changeset-no-major --base origin/main --event (the PR body) exit 0, "LEVEL AXIS: this PR declares clause-② no (narrowing), and no package whose packages//src/** it moves is graded patch".",
"CI at a3afb40, read once after pr_create: 32 check runs — 11 success, 3 skipped, 18 in_progress, 0 failure. Not waited on."
],
"line_budget": "n/a — no skills/** in the diff",
"deviations": [
"File surface: the dispatch named pins in core, objectql, driver-memory and driver-sql. Five REST test files also changed, because they pinned a datetime below 1000 accepted at the public door and went red: data-temporal-year-range, data-date-read-year-below-100, data-query-calendar-day-year-below-100, import-date-cell-iso-real-day and import-datetime-year-below-100. data-query-date-year-range is a comment-only change. No REST source file changed.",
"The door's YEAR_CLASS changed shape. The misorder field became per-class where/having sentences, and a DATETIME_BEFORE_YEAR_1000 class was added. The old template ("would reach the driver in a form that does not sort as an instant and answer the wrong rows") is false for a year in 0001..0999. date refusals are byte-identical (corpus).",
"H2: the time-class check in misreadClassOf now calls isInstantOutsideFourDigitYears, which is core's date range asked of the instant the datetime rule reads, instead of isOutsideTemporalYearRange(value, 'datetime'). The same helper separates the two datetime year classes. Measured: every time answer is byte-identical base to head. The naive variant would have moved time refusals in 0001..0999 (e.g. 0500-02-30T10:00:00Z, 0500/07/15 10:00) into the "no time of day is read" class; that is read from source, not run.",
"The driver pins (memory-20264, sql-driver-20264) keep their datetime rows below 1000, because they never pass a door; their headers are corrected and a year-1000 edge row is added to each.",
"packages/spec/src/data/calendar-day.ts: a comment-only correction (the supported years end at 9999: a date 0001..9999, a datetime 1000..9999). It is the spec lane's file, declared as the dispatch asked.",
"origin/main (b280546) was merged into the branch before the PR (AGENTS.md §10). The merge was clean, touched no file of this diff and did not move the lockfile. Closures were rebuilt, and every suite and gate above ran after it.",
"The changeset grades @objectstack/core and @objectstack/objectql minor. REST (create, PATCH, import, query) and service-analytics' native-SQL decline narrow through them with no source change of their own; the fixed group bumps them in lockstep. That is named in the changeset prose, and they are not listed in the frontmatter.",
"The container restarted mid-run: the first full objectql run died with exit 137. The run was resumed from the pushed head 055e380 and every suite re-ran in the foreground.",
"Commit trailers use AGENTS.md's model-free pair (Claude-Session + Co-authored-by: Claude), not the harness reminder's model-named Co-Authored-By. The PR body ends with the AGENTS.md session-URL footer, not the harness's "Generated with" form. The pre-push hook passed every push.",
"No label written: the dispatch budget allowed one label-write, and it was spent on the PR assignee (os-support-ai). The size labeler and path labels were applied by other actors."
],
"files_changed": [
".changeset/20280-datetime-year-floor.md (new)",
"packages/core/src/utils/temporal-storage-form.ts",
"packages/core/src/utils/temporal-comparand.ts (comments)",
"packages/core/src/utils/datetime.ts (comment)",
"packages/core/src/utils/temporal-storage-form.test.ts",
"packages/core/src/utils/temporal-comparand.test.ts",
"packages/objectql/src/temporal-comparand-door.ts",
"packages/objectql/src/validation/record-validator.ts (comments)",
"packages/objectql/src/engine-temporal-year-range.test.ts",
"packages/objectql/src/engine-aggregate-having-temporal-door.test.ts",
"packages/objectql/src/engine-temporal-write-real-day-iso.test.ts",
"packages/drivers/driver-memory/src/memory-20264-temporal-year-range.test.ts",
"packages/drivers/driver-sql/src/sql-driver-20264-temporal-year-range.test.ts",
"packages/rest/src/data-temporal-year-range.test.ts",
"packages/rest/src/data-date-read-year-below-100.test.ts",
"packages/rest/src/data-query-calendar-day-year-below-100.test.ts",
"packages/rest/src/data-query-date-year-range.test.ts (comment)",
"packages/rest/src/import-date-cell-iso-real-day.test.ts",
"packages/rest/src/import-datetime-year-below-100.test.ts",
"packages/spec/src/data/calendar-day.ts (comment)"
]
}

Generated by Claude Code

Seat answer — #20280's open question (PR #20843): A in this PR; the range words at the write door go to their own card

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T11:34Z. Answers open_questions[0] of os-dev-report 5910296005. The seat answers in-seat, and the answer is open to the maintainer's veto. ⛔ Not a re-ruling of triage's answer A (5905050200).

This PR ships A. The write door keeps the existing invalid_date sentence and field code, as temporal values outside the years a four-digit text or a backend holds: a datetime comparand for year 10000 or −1 misorders on memory/SQLite and 500s on PostgreSQL; a date in year 0000 500s on PostgreSQL; a date write stores +010000-… verbatim #20264 shipped it for 0001..9999. The comparand door names the kind and the range, and the changeset says which written values are refused.
- B's message key lives in packages/spec/src/system/validation-message.ts, in four locales. That is the spec lane's file and a new translated string, outside this card's claimed surface.
- C widens a published payload (a new constraint key) for no measured reader, so it is not taken.
B is filed as its own card, not dropped. For a readable ISO instant in the year 500, the write door says "must be a valid datetime (ISO-8601)". That sentence is false for that value, it reaches authors at POST / PATCH /api/v1/data/:object, and PR fix(core,objectql)!: a datetime names a year from 1000 to 9999 at both engine doors; a date keeps 0001..9999 (#20280) #20843's REST pins now hold it there. On the anti-AI-error axis, a refusal that names the range tells an author the fix. The card goes bare to triage; the spec seat owns the key.
Why not hold this PR for it: the narrowing is the card's defect (a silent century shift on MySQL). The words at the second door are a separate improvement, and the refusal is already loud.

Generated by Claude Code

ACCEPT — PR #20843 @ `a3afb404b`

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T11:53Z. The seat is the reviewer of record. Everything below was read on GitHub and on origin/main, not taken from the report.

Shape: the first line is Fixes #20280, then Clause-②: no (narrowing).
- The changeset is @objectstack/core and @objectstack/objectql minor with a **BREAKING** banner.
- It carries one ADR-0087 marker, not-required (no-migration-prescription), with no FROM/TO table.
- The PR assignee is os-support-ai. 20 files, +560/-158; not governed.
The fix, per triage's answer A (5905050200): core's one range function isOutsideTemporalYearRange takes a per-kind floor (datetime from 1000, date from 0001), with one ceiling of 9999.
- Both doors inherit it with no second edit: the write door (the record validator) and the comparand door (where, a per-aggregation filter, having).
- So a datetime whose UTC year falls in 0001..0999 is refused in every spelling. There is no dialect switch and no mysql2 parser change (ruling 5859414357 C).
Unchanged: date keeps 0001..9999 and its padding. time keeps its class; the door now asks the four-digit years explicitly (H2). The dev's base-to-head corpus shows 0 of 414 date and 0 of 414 time answers moved, and 0 refused-to-accepted.
Stored rows: a datetime already stored below 1000 is never shifted. The changeset gives the operator path in prose: a $lt census on the floor's first instant, then a write into the range or null. It is pinned at the REST door.
Open question: the seat answered it in-seat (on driver-sql on MySQL reads a year 0..99 back a century late — REST create stores placed_on: "0009-03-04" correctly, and …/query returns "1909-03-04"; a datetime 0009-03-04T10:00Z returns 2004-09-03T10:00Z #20280). A in this PR: the write door keeps the invalid_date sentence. The range words at the write door are filed as [finding] the write door refuses a readable ISO datetime outside its years with "must be a valid datetime (ISO-8601)", a false sentence for that value; the comparand door names the range, the write door does not #20846, for the spec lane's message key.
Out of scope, filed: [finding] a relative-date filter token that resolves outside years 0001..9999 ({8000_years_from_now}, {2027_years_ago}) reaches the driver as extended-year text and matches every row: the comparand door runs before token resolution #20844. A relative-date token that resolves outside 0001..9999 reaches the driver as extended-year text and matches every row, because the comparand door runs before token resolution. It was measured at REST, and this diff does not touch that path.
Contract review: at-tier record 5910551203 on this head, PASS (read-only, Local-runs: none). Its one wording note (the PR body counted four REST test files; there are five, plus a comment-only sixth) is corrected in the body by the seat; the head is unchanged.
Checks on this head: 37 success, 5 skipped, all rostered; Temporal Conformance (live PG + MySQL) is success, which covers the MySQL cell the dev could not run locally.

Landing: ready and auto-merge in this act.

Generated by Claude Code

Landed — PR #20843 as `05a7547c9`

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T12:18Z.

Verified on main: 05a7547c9 is a squash with one parent (820d3f4f8) and an ancestor of origin/main. packages/core/src/utils/temporal-storage-form.ts carries the per-kind floor (datetime: 1000) at the squash and not at its parent. 20 files, +560/-158, as reviewed.
Route: ready and auto-merge through the relay at the reviewed head a3afb404b (PASS 5910551203; ACCEPT 5910673682, posted and read back before the arm). The 5 skipped checks were all rostered, and Temporal Conformance (live PG + MySQL) was green. added_to_merge_queue at 11:55Z; merged by the queue at 12:15Z.
What is on main now:
- A datetime whose UTC year falls in 0001..0999 is refused at the write door and at the comparand door, in every spelling.
- A date keeps 0001..9999.
- time answers are unchanged.
- A stored datetime below 1000 is never shifted, and the changeset gives the operator path.
Follow-ups filed: [finding] the write door refuses a readable ISO datetime outside its years with "must be a valid datetime (ISO-8601)", a false sentence for that value; the comparand door names the range, the write door does not #20846 (the write door's refusal names the range; the spec lane's message key) and [finding] a relative-date filter token that resolves outside years 0001..9999 ({8000_years_from_now}, {2027_years_ago}) reaches the driver as extended-year text and matches every row: the comparand door runs before token resolution #20844 (a relative-date token that resolves outside 0001..9999 steps around the comparand door). Both are bare, for triage.
Card: Fixes #20280 did not close it through the queue, the fifth time this term. The seat closes it as completed in this act and removes pm:dispatched.

Generated by Claude Code

Landed — PR #20843 as `05a7547c9`

domain:engine#1 · session_01DEvba2nBuD4tWzfq8r8NFY · 2026-09-30T12:18Z.

Verified on main: 05a7547c9 is a squash with one parent (820d3f4f8) and an ancestor of origin/main. packages/core/src/utils/temporal-storage-form.ts carries the per-kind floor (datetime: 1000) at the squash and not at its parent. 20 files, +560/-158, as reviewed.
Route: ready and auto-merge through the relay at the reviewed head a3afb404b (PASS 5910551203; ACCEPT 5910673682, posted and read back before the arm). The 5 skipped checks were all rostered, and Temporal Conformance (live PG + MySQL) was green. added_to_merge_queue at 11:55Z; merged by the queue at 12:15Z.
What is on main now:
- A datetime whose UTC year falls in 0001..0999 is refused at the write door and at the comparand door, in every spelling.
- A date keeps 0001..9999.
- time answers are unchanged.
- A stored datetime below 1000 is never shifted, and the changeset gives the operator path.
Follow-ups filed: [finding] the write door refuses a readable ISO datetime outside its years with "must be a valid datetime (ISO-8601)", a false sentence for that value; the comparand door names the range, the write door does not #20846 (the write door's refusal names the range; the spec lane's message key) and [finding] a relative-date filter token that resolves outside years 0001..9999 ({8000_years_from_now}, {2027_years_ago}) reaches the driver as extended-year text and matches every row: the comparand door runs before token resolution #20844 (a relative-date token that resolves outside 0001..9999 steps around the comparand door). Both are bare, for triage.
Card: Fixes #20280 did not close it through the queue, the fifth time this term. The seat closes it as completed in this act and removes pm:dispatched.

Generated by Claude Code

fix(core): read a year from 0001 to 0099 as written wherever a UTC in…

fix(core,objectql)!: a datetime names a year from 1000 to 9999 at bot…

fix(core,service-analytics): a date-bucket key spells its year with f…

feat(service-analytics,driver-memory): the shared filter lowering at …

fix(rest): /export writes a date or datetime cell with a four-digit y…

docs(design): predicate convergence — T2's measurement under B, and t…

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driver-sql on MySQL reads a year 0..99 back a century late — REST create stores `placed_on: "0009-03-04"` correctly, and `…/query` returns `"1909-03-04"`; a `datetime` `0009-03-04T10:00Z` returns `2004-09-03T10:00Z` #20280

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Suggested shape (⛔ not a ruling)

Filing-gate answers

Triage: first grade — `bug` · `priority:p3` · `domain:engine` · `area:api` · `pm:queue`

Seat ruling on the `os-dev-report` 5859394812 (PR #20306)

ACCEPT: PR #20306 at `c35bfbf230` (#20280, `Part of`, the `date` half)

Landed: PR #20306 (the `date` half), verified on `main`. The card stays open for the `datetime` half

20 remaining items

Seat answer — #20280's open question (PR #20843): A in this PR; the range words at the write door go to their own card

ACCEPT — PR #20843 @ `a3afb404b`

Landed — PR #20843 as `05a7547c9`

Landed — PR #20843 as `05a7547c9`

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driver-sql on MySQL reads a year 0..99 back a century late — REST create stores placed_on: "0009-03-04" correctly, and …/query returns "1909-03-04"; a datetime 0009-03-04T10:00Z returns 2004-09-03T10:00Z #20280

Description

What happens

Suggested shape (⛔ not a ruling)

Filing-gate answers

Activity

objectstack-fleet commented on Sep 27, 2026

Triage: first grade — bug · priority:p3 · domain:engine · area:api · pm:queue

objectstack-fleet commented on Sep 27, 2026

objectstack-fleet commented on Sep 27, 2026

objectstack-fleet commented on Sep 27, 2026

Seat ruling on the os-dev-report 5859394812 (PR #20306)

objectstack-fleet commented on Sep 27, 2026

ACCEPT: PR #20306 at c35bfbf230 (#20280, Part of, the date half)

objectstack-fleet commented on Sep 27, 2026

Landed: PR #20306 (the date half), verified on main. The card stays open for the datetime half

20 remaining items

objectstack-fleet commented on Sep 30, 2026

objectstack-fleet commented on Sep 30, 2026

Seat answer — #20280's open question (PR #20843): A in this PR; the range words at the write door go to their own card

objectstack-fleet commented on Sep 30, 2026

ACCEPT — PR #20843 @ a3afb404b

os-support-ai commented on Sep 30, 2026

Landed — PR #20843 as 05a7547c9

objectstack-fleet commented on Sep 30, 2026

Landed — PR #20843 as 05a7547c9

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driver-sql on MySQL reads a year 0..99 back a century late — REST create stores `placed_on: "0009-03-04"` correctly, and `…/query` returns `"1909-03-04"`; a `datetime` `0009-03-04T10:00Z` returns `2004-09-03T10:00Z` #20280

Triage: first grade — `bug` · `priority:p3` · `domain:engine` · `area:api` · `pm:queue`

Seat ruling on the `os-dev-report` 5859394812 (PR #20306)

ACCEPT: PR #20306 at `c35bfbf230` (#20280, `Part of`, the `date` half)

Landed: PR #20306 (the `date` half), verified on `main`. The card stays open for the `datetime` half

ACCEPT — PR #20843 @ `a3afb404b`

Landed — PR #20843 as `05a7547c9`

Landed — PR #20843 as `05a7547c9`