diff --git a/BLOCKED.md b/BLOCKED.md
index 0040b82b..e1c8d722 100644
--- a/BLOCKED.md
+++ b/BLOCKED.md
@@ -123,6 +123,11 @@
 - ~~**替代：** `GET /api/sessions` 排除 `messages = []`，响应带 `draft`；启动和「新建对话」优先用这份空咨询，不再连点就堆新行。~~
 - **解除（2026-09-21，BUG-989）：** `startNewChat` 只在本地开一条，第一问 `send()` 才 `POST /api/sessions`；未落库不写 `?c=`。列表过滤收窄到咨询空行，校正会话不再被 `messages = []` 误删（BUG-987）。刷新丢掉未开口的本地空会话是可接受的。
 
+## 会话列表归档：本机 Docker 网段耗尽未跑 test:db（2026-09-21，BUG-990）
+
+- **Docker 在 PATH**，但 `startPostgresFixture` 建 compose 网络报 `all predefined address pools have been fully subnetted`（其它 worktree 留下的 postgres 网络占满）。**未跑 `npm run test:db`，不得写成通过。**
+- **替代证据：** `frontend/tests/local-postgres-not.test.ts`：`not("archived_at","is",null)` 编译 `"archived_at" is not null` 且不含 `<>`；`not(...,"is",undefined)` throw `unsupported not filter`。真实 Postgres 断言仍在 `database-session-list-visibility.test.ts`，最终验证交给门禁机。BUG-990 保持 investigating。
+
 ## 会话列表多键排序：无 Docker 未跑翻页重叠（2026-09-17，BUG-926）
 
 - **无 Docker：** 本机 `docker` 不在 PATH。任务书要求 `npm run test:db` 插入三条不同 `updated_at` 的会话，`GET /api/sessions?limit=2` 返回最新两条且 `nextCursor` 翻页拿到第三条、无重叠。**未跑，不得写成通过。**
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb8a7de1..5ea08772 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 印度占星 Skill 更新日志
 
+## 2026-09-21 — 归档记录可以打开了
+
+侧栏点「归档记录」不再报读不到聊天。Skill 版本不变。
+
 ## 2026-09-21 — 侧栏重新列出生时校正，时间按最后活动，新建对话开口前不落库
 
 侧栏不再把生时校正会话藏起来。每条下面的时间改成最后一次说话或校正操作的时间，和列表排序、分组一致。点「新建对话」先只在这一页开着，真正发出第一句话才存到云端；连点不会堆出一排空的「新对话」。Skill 版本不变。
diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index d439b605..a4a10830 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -13103,3 +13103,19 @@
 - 相关记录：BUG-928、BUG-987
 - 复发自：BUG-928（延迟落库让步未收口）
 - 修复版本：待本修复合入 staging
+
+## BUG-990 | 侧栏切到归档记录后 500
+
+- 状态：investigating
+- 首次发现：2026-09-21
+- 最近更新：2026-09-21
+- 影响面：`LocalPostgresQueryBuilder.not()`、`GET /api/sessions?archived=1`、侧栏「归档记录」
+- 用户现象：点侧栏「归档记录」后聊天记录读不出来（500「聊天记录暂时无法读取」）。
+- 触发条件：自托管本地 Postgres 上打开归档视图。托管 Supabase 不受影响。
+- 根因：兼容层 `not()` 只实现 PostgREST 算子子集 `eq` / `cs`。`applyArchiveFilter(..., true)` 调用 `not("archived_at", "is", null)`，构造期不报错，真跑 SQL 时 throw `unsupported not filter`，被列表路由外层 catch 成 500。该调用自 `a1956deb`（BUG-553）就在，此前没有真实数据库测试走到归档分支。
+- 修复：`not()` 增加 `is` 分支，新 filter kind `isNot`，编译为 `is not null` / `is not true` / `is not false`。不得写成 `<> null`（恒为 NULL，会静默 0 行）。
+- 验证：`local-postgres-not.test.ts`；`database-session-list-visibility.test.ts` 归档分支（有 Docker 时）。**本记录在 `test:db` 或门禁该测试转绿前不得标 resolved。**
+- 防复发：兼容层新增算子必须有真实 Postgres 覆盖，不得只加源码正则。
+- 相关记录：BUG-553、BUG-926、BUG-987
+- 复发自：BUG-926（同一兼容层的不同缺口：当时是 `order()` 只留最后一键）
+- 修复版本：待本修复合入 staging 且门禁该测试转绿
diff --git a/docs/tasks/PROGRESS-session-list-rebuild-fix-20260921.md b/docs/tasks/PROGRESS-session-list-rebuild-fix-20260921.md
new file mode 100644
index 00000000..bcd9291f
--- /dev/null
+++ b/docs/tasks/PROGRESS-session-list-rebuild-fix-20260921.md
@@ -0,0 +1,30 @@
+# PROGRESS · 会话列表重建验收修复单（2026-09-21）
+
+工作树：`.worktrees/session-list-rebuild-fix-20260921`  
+分支：`codex/session-list-rebuild-fix-20260921`  
+基线：`origin/staging` @ `70d595e3`（修复单；代码基线 `e71e4f92`）
+
+## 任务状态
+
+| 任务 | 状态 | 说明 |
+| --- | --- | --- |
+| F1 兼容层 `not(col,"is",…)` BUG-990 | 完成（实现） | `isNot` → `is not null/true/false`；未改 `applyArchiveFilter` |
+| F2 归档空咨询 fixture | 完成 | 归档视图不返回已归档的空咨询；两视图互斥且对上 `cloudListIncludesSession` |
+| F3 记录 | 完成 | BUG-990 先标 investigating，等 `test:db` 或门禁转绿再 resolved |
+
+## 实现要点
+
+- `LocalPostgresQueryBuilder.not()` 增加 `operator === "is"`，新 filter kind `isNot`。
+- `compileUnaryIsClause` 编译 `is [not] null|true|false`；其余取值 throw。不走 `<>`。
+- `database-session-list-visibility.test.ts` 原断言保留，另加已归档空咨询一行。
+
+## 测试
+
+| 项 | 结果 |
+| --- | --- |
+| `tsc --noEmit` | 0 错 |
+| `npm run lint` | 0 error / **119 warning**（未增） |
+| 定向 | `local-postgres-not` / `local-postgres-or` / `chat-session-authority` / `session-list-filter` 通过 |
+| `npm test` | **3600** 条，**3512** 通过 / **88** 失败。较本机上次 `e71e4f92` 全量（3598 / 3509 / 89）净增 2 绿（`local-postgres-not` 两条）。失败仍是本机 Windows Docker 网段 + symlink/chmod/脚本，不是本单新逻辑。 |
+| `npm run test:db` | Docker 网段耗尽，**未跑通**。见 `BLOCKED.md`。BUG-990 保持 investigating，最终验证交给门禁。 |
+| `next build` | 本轮未跑（Windows skill symlink EPERM 已知缺口，与本单无关） |
diff --git a/docs/tasks/README.md b/docs/tasks/README.md
index d8e36d49..6c865299 100644
--- a/docs/tasks/README.md
+++ b/docs/tasks/README.md
@@ -153,7 +153,7 @@
 | `TASK-consultation-answer-start-anchor-fix-20260917.md` | `PROGRESS-consultation-answer-start-anchor-fix-20260917.md` | 验收修复单：F1 头就是留白行时留白按整视口算（BUG-931）；F2 留白只在钉住期间存在（BUG-932）；前置：先修 e4e73f56 的两处 TS 错否则门禁不过 | 已验收 | `cc1a8980`（Claude 验收：tsc 0 / lint 0 error / npm test 3457 条 39 红与 11c0028d 逐条一致、新增 2 条绿 / `next build --webpack` 通过、`/` Static、首屏 gzip 591,242（较 09-16 基线 582,800 +1.45%，含会话列表单）/ Chrome 真实布局 S1–S6 全部通过，S6 新助手行距顶 16px 且增高不动，S5 不再写留白）；真机六条欠 |
 | — | `PROGRESS-starter-greeting-20260917.md` | 首页开场语改成 claude.ai 式单行问候：`starter-greeting.ts` 的「称呼 + 追问句」五时段十五条收成三个池子（时段 / 星期 / 回访，按 `variantSelection` 确定性取一条），副标题行与 `.starter-salutation` 下线，h1 降到 `clamp(24px, 2.8vw, 30px)`；追问移到输入框占位符「想聊什么都可以」。产品直接拍板，非 Bug，不占 BUG 号 | 待验收 | `codex/starter-greeting-20260917` |
 | `TASK-session-list-rebuild-20260921.md` | `PROGRESS-session-list-rebuild-20260921.md` | **P0 会话列表重建（`e4e73f56` 的返工）**：服务端 `GET /api/sessions` 用 `messages <> '[]'` 排除空咨询，但校正会话的 `messages` 永远是 `[]`（建行写死空数组、创建合同只收空数组、PATCH 忽略、`touch_chat_session_from_rectification_case` 只 bump `updated_at`）→ **全部生时校正会话从侧栏消失**，而客户端 `isListedSidebarSession` 明确放行校正会话，两层规则相反且无跨层对断（BUG-987）；同一提交把副标题换成 `created_at`，排序/分组/游标仍是 `updated_at`，列表可见时间不单调（9/18→9/17→9/7→9/16）（BUG-988）；BUG-928 让步下来的「复用空会话」不 bump 时间，点新建变成跳回 9/17 的旧草稿（BUG-989）。**产品 09-21 拍板**：D1 副标题改最后活动时间（推翻 BUG-929 该条，其余保留）、D2 收掉 `BLOCKED.md:120` 的让步，第一问前不落库、删复用与 `draft`。T1 不得让步，T3 可拆轮。BUG 段 987 起 | **验收未通过（1 条 P1）** | `e71e4f92`（Claude 验收：T1/T2/T3 实现均正确；tsc 0 / lint 0 error 119 warning 与基线同 / `npm test` 本机 3640 条 34 红与 `f8d65e48` 逐条一致、净增 5 绿 / `next build --webpack` 通过、`/` Static、首屏 gzip 643,115 较基线 −0.027% / page.tsx 1826→1791。**P1：门禁 run 2832 红、staging 未部署**——新加的真实 Postgres 测试在有 Docker 的门禁机上跑出 `unsupported not filter`，兼容层 `not()` 不支持 `is` 算子，归档分支炸。修复单 `TASK-session-list-rebuild-fix-20260921.md`） |
-| `TASK-session-list-rebuild-fix-20260921.md` | — | **验收修复单（挡着三条修复上线）**：本地 PG 兼容层 `LocalPostgresQueryBuilder.not()` 只认 `eq` / `cs` 两个算子，`not("archived_at","is",null)` 直接 throw → `GET /api/sessions?archived=1` 落外层 catch 回 500，**侧栏「归档记录」自 `a1956deb`（09-06，BUG-553）起一直打不开**，两周无人发现是因为只有源码正则合同看着它；本轮新加的真实 Postgres 测试第一次真跑到这条路径，把它照出来，于是门禁 run 2832 红、`e71e4f92` 没部署。**决策**：在兼容层补 `is not null / is not true / is not false`，不得反过来改调用方绕开，不得删改测试断言让门禁变绿。与 BUG-926 的 `order()` 缺口同类。BUG 段 990 起 | 待领取 | — |
+| `TASK-session-list-rebuild-fix-20260921.md` | `PROGRESS-session-list-rebuild-fix-20260921.md` | **验收修复单（挡着三条修复上线）**：本地 PG 兼容层 `LocalPostgresQueryBuilder.not()` 只认 `eq` / `cs` 两个算子，`not("archived_at","is",null)` 直接 throw → `GET /api/sessions?archived=1` 落外层 catch 回 500，**侧栏「归档记录」自 `a1956deb`（09-06，BUG-553）起一直打不开**，两周无人发现是因为只有源码正则合同看着它；本轮新加的真实 Postgres 测试第一次真跑到这条路径，把它照出来，于是门禁 run 2832 红、`e71e4f92` 没部署。**决策**：在兼容层补 `is not null / is not true / is not false`，不得反过来改调用方绕开，不得删改测试断言让门禁变绿。与 BUG-926 的 `order()` 缺口同类。BUG 段 990 起 | 待验收 | `codex/session-list-rebuild-fix-20260921` |
 
 ### 个人报告
 
diff --git a/frontend/src/lib/db/local-postgres-client-core.ts b/frontend/src/lib/db/local-postgres-client-core.ts
index f21894ae..cb2b6c38 100644
--- a/frontend/src/lib/db/local-postgres-client-core.ts
+++ b/frontend/src/lib/db/local-postgres-client-core.ts
@@ -20,6 +20,7 @@ type Filter =
   | Readonly<{ kind: "like"; column: string; value: unknown }>
   | Readonly<{ kind: "in"; column: string; value: readonly unknown[] }>
   | Readonly<{ kind: "is"; column: string; value: unknown }>
+  | Readonly<{ kind: "isNot"; column: string; value: unknown }>
   | Readonly<{ kind: "notContains"; column: string; value: unknown }>
   | Readonly<{ kind: "or"; expression: string }>;
 
@@ -46,6 +47,19 @@ function identifier(value: string): string {
   return `"${normalized}"`;
 }
 
+export function compileUnaryIsClause(
+  column: string,
+  value: unknown,
+  negated: boolean,
+): string {
+  const quoted = identifier(column);
+  const target = value === null ? "null" : value === true ? "true" : value === false ? "false" : null;
+  if (target === null) {
+    throw new Error(negated ? "unsupported not filter" : "unsupported is filter");
+  }
+  return `${quoted} is${negated ? " not" : ""} ${target}`;
+}
+
 export function formatOrderClause(
   ordering: readonly { column: string; ascending: boolean }[],
 ): string {
@@ -388,6 +402,11 @@ class LocalPostgresQueryBuilder implements PromiseLike<QueryResult> {
       this.filters.push({ kind: "neq", column, value });
       return this;
     }
+    if (operator === "is") {
+      compileUnaryIsClause(column, value, true);
+      this.filters.push({ kind: "isNot", column, value });
+      return this;
+    }
     if (operator !== "cs") throw new Error("unsupported not filter");
     this.filters.push({ kind: "notContains", column, value });
     return this;
@@ -451,10 +470,10 @@ class LocalPostgresQueryBuilder implements PromiseLike<QueryResult> {
       }
       const column = identifier(filter.column);
       if (filter.kind === "is") {
-        if (filter.value === null) return `${column} is null`;
-        if (filter.value === true) return `${column} is true`;
-        if (filter.value === false) return `${column} is false`;
-        throw new Error("unsupported is filter");
+        return compileUnaryIsClause(filter.column, filter.value, false);
+      }
+      if (filter.kind === "isNot") {
+        return compileUnaryIsClause(filter.column, filter.value, true);
       }
       if (filter.kind === "in") {
         if (filter.value.length === 0) return "false";
diff --git a/frontend/tests/database-session-list-visibility.test.ts b/frontend/tests/database-session-list-visibility.test.ts
index 2292dee5..82c090ae 100644
--- a/frontend/tests/database-session-list-visibility.test.ts
+++ b/frontend/tests/database-session-list-visibility.test.ts
@@ -7,7 +7,11 @@ import {
   closeLocalPostgresDataPools,
   createLocalPostgresDataClient,
 } from "../src/lib/db/local-postgres-client-core.ts";
-import { applyArchiveFilter, excludeEmptyConsultations } from "../src/lib/session-list-filter.ts";
+import {
+  applyArchiveFilter,
+  cloudListIncludesSession,
+  excludeEmptyConsultations,
+} from "../src/lib/session-list-filter.ts";
 import { startPostgresFixture } from "./helpers/postgres-fixture.ts";
 
 const runner = fileURLToPath(new URL("../scripts/db-migrate.mjs", import.meta.url));
@@ -17,6 +21,7 @@ const emptyConsultation = "11111111-1111-4111-8111-111111111111";
 const emptyRectification = "22222222-2222-4222-8222-222222222222";
 const filledConsultation = "33333333-3333-4333-8333-333333333333";
 const archivedRectification = "44444444-4444-4444-8444-444444444444";
+const archivedEmptyConsultation = "55555555-5555-4555-8555-555555555555";
 
 test("session list query keeps empty rectification rows and drops empty consultations", {
   skip: docker ? false : "docker unavailable",
@@ -43,7 +48,8 @@ test("session list query keeps empty rectification rows and drops empty consulta
       ('${emptyConsultation}', '${userId}', 'Empty consult', 'general', 'test-model', '[]', 'consultation', false, null, now()),
       ('${emptyRectification}', '${userId}', 'Empty rectification', 'general', 'test-model', '[]', 'birth_time_rectification', false, null, now()),
       ('${filledConsultation}', '${userId}', 'Filled consult', 'general', 'test-model', '[{"role":"user","text":"问一句"}]', 'consultation', false, null, now()),
-      ('${archivedRectification}', '${userId}', 'Archived rectification', 'general', 'test-model', '[]', 'birth_time_rectification', false, '2026-09-08T00:00:00Z', now());
+      ('${archivedRectification}', '${userId}', 'Archived rectification', 'general', 'test-model', '[]', 'birth_time_rectification', false, '2026-09-08T00:00:00Z', now()),
+      ('${archivedEmptyConsultation}', '${userId}', 'Archived empty consult', 'general', 'test-model', '[]', 'consultation', false, '2026-09-08T00:00:00Z', now());
     `);
     const local = createLocalPostgresDataClient(
       fixture.connectionUrl("app_runtime", "app-runtime-test-password"),
@@ -65,9 +71,24 @@ test("session list query keeps empty rectification rows and drops empty consulta
       ),
     );
     assert.equal(archived.error, null, archived.error?.message);
+    const archivedIds = (archived.data as { id: string }[]).map((row) => row.id).sort();
+    assert.deepEqual(archivedIds, [archivedRectification]);
+    assert.equal(archivedIds.includes(archivedEmptyConsultation), false);
+    assert.equal(liveIds.some((id) => archivedIds.includes(id)), false);
+    const rows = [
+      { id: emptyConsultation, sessionType: "consultation" as const, messagesEmpty: true, archived: false },
+      { id: emptyRectification, sessionType: "birth_time_rectification" as const, messagesEmpty: true, archived: false },
+      { id: filledConsultation, sessionType: "consultation" as const, messagesEmpty: false, archived: false },
+      { id: archivedRectification, sessionType: "birth_time_rectification" as const, messagesEmpty: true, archived: true },
+      { id: archivedEmptyConsultation, sessionType: "consultation" as const, messagesEmpty: true, archived: true },
+    ];
     assert.deepEqual(
-      (archived.data as { id: string }[]).map((row) => row.id),
-      [archivedRectification],
+      rows.filter((row) => cloudListIncludesSession({ ...row, archivedView: false })).map((row) => row.id).sort(),
+      liveIds,
+    );
+    assert.deepEqual(
+      rows.filter((row) => cloudListIncludesSession({ ...row, archivedView: true })).map((row) => row.id).sort(),
+      archivedIds,
     );
   } finally {
     await closeLocalPostgresDataPools();
diff --git a/frontend/tests/local-postgres-not.test.ts b/frontend/tests/local-postgres-not.test.ts
new file mode 100644
index 00000000..fa3dae5f
--- /dev/null
+++ b/frontend/tests/local-postgres-not.test.ts
@@ -0,0 +1,33 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import {
+  closeLocalPostgresDataPools,
+  compileUnaryIsClause,
+  createLocalPostgresDataClient,
+} from "../src/lib/db/local-postgres-client-core.ts";
+
+test("not(col, is, null) compiles to IS NOT NULL rather than inequality", () => {
+  const sql = compileUnaryIsClause("archived_at", null, true);
+  assert.equal(sql, '"archived_at" is not null');
+  assert.doesNotMatch(sql, /<>/);
+  assert.equal(compileUnaryIsClause("archived_at", true, true), '"archived_at" is not true');
+  assert.equal(compileUnaryIsClause("archived_at", false, true), '"archived_at" is not false');
+  assert.equal(compileUnaryIsClause("archived_at", null, false), '"archived_at" is null');
+});
+
+test("not(col, is, undefined) still throws", async () => {
+  assert.throws(() => compileUnaryIsClause("archived_at", undefined, true), /unsupported not filter/);
+  const local = createLocalPostgresDataClient(
+    "postgresql://unused:unused@127.0.0.1:9/unused",
+    { id: "11111111-1111-4111-8111-111111111111", email: "unused@example.com" },
+  );
+  try {
+    assert.throws(
+      () => local.from("chat_sessions").select("id").not("archived_at", "is", undefined),
+      /unsupported not filter/,
+    );
+  } finally {
+    await closeLocalPostgresDataPools();
+  }
+});