diff --git a/package.json b/package.json
index b1cf83db227e..6d96eeae2808 100644
--- a/package.json
+++ b/package.json
@@ -1987,7 +1987,7 @@
     "test:unit:fast:audit": "node scripts/test-unit-fast-audit.mjs",
     "test:voicecall:closedloop": "node scripts/test-voicecall-closedloop.mjs",
     "test:watch": "node scripts/test-projects.mjs --watch",
-    "test:windows:ci": "node scripts/test-projects.mjs src/shared/runtime-import.test.ts src/agents/sessions/windows-git-bash-path.test.ts src/process/exec.windows.test.ts src/process/windows-command.test.ts src/infra/windows-install-roots.test.ts src/node-host/invoke-system-run-allowlist.test.ts src/daemon/schtasks.startup-fallback.test.ts extensions/lobster/src/lobster-runner.test.ts test/scripts/format-generated-module.test.ts test/scripts/npm-runner.test.ts test/scripts/openclaw-cross-os-installer.windows.test.ts test/scripts/openclaw-cross-os-release-workflow.test.ts test/scripts/pnpm-runner.test.ts test/scripts/run-with-env.test.ts test/scripts/ts-topology.test.ts test/scripts/ui.test.ts test/scripts/vitest-process-group.test.ts",
+    "test:windows:ci": "node scripts/test-projects.mjs src/shared/runtime-import.test.ts src/config/sessions/store.session-lifecycle-mutation.test.ts src/agents/sessions/windows-git-bash-path.test.ts src/process/exec.windows.test.ts src/process/windows-command.test.ts src/infra/windows-install-roots.test.ts src/node-host/invoke-system-run-allowlist.test.ts src/daemon/schtasks.startup-fallback.test.ts extensions/lobster/src/lobster-runner.test.ts test/scripts/format-generated-module.test.ts test/scripts/npm-runner.test.ts test/scripts/openclaw-cross-os-installer.windows.test.ts test/scripts/openclaw-cross-os-release-workflow.test.ts test/scripts/pnpm-runner.test.ts test/scripts/run-with-env.test.ts test/scripts/ts-topology.test.ts test/scripts/ui.test.ts test/scripts/vitest-process-group.test.ts",
     "tool-display:check": "node --import tsx scripts/tool-display.ts --check",
     "tool-display:write": "node --import tsx scripts/tool-display.ts --write",
     "ts-topology": "node --import tsx scripts/ts-topology.ts",
diff --git a/scripts/ci-changed-scope.mjs b/scripts/ci-changed-scope.mjs
index d5091a85a3e2..3d3ad959d62a 100644
--- a/scripts/ci-changed-scope.mjs
+++ b/scripts/ci-changed-scope.mjs
@@ -49,9 +49,9 @@ const ANDROID_NATIVE_RE = /^(apps\/android\/|apps\/shared\/)/;
 const NODE_SCOPE_RE =
   /^(src\/|test\/|extensions\/|packages\/|scripts\/|ui\/|\.github\/|openclaw\.mjs$|package\.json$|pnpm-lock\.yaml$|pnpm-workspace\.yaml$|tsconfig.*\.json$|vitest.*\.ts$|tsdown\.config\.ts$|\.oxlintrc\.json$|\.oxfmtrc\.jsonc$)/;
 const WINDOWS_SCOPE_RE =
-  /^(src\/process\/|src\/infra\/windows-install-roots\.ts$|src\/shared\/(?:import-specifier|runtime-import)(?:\.test)?\.ts$|scripts\/(?:install\.ps1|openclaw-cross-os-release-checks\.ts|github\/run-openclaw-cross-os-release-checks\.sh|(?:npm-runner|pnpm-runner|ui|vitest-process-group)\.(?:mjs|js)|lib\/(?:format-generated-module\.mjs|cross-os-release-checks\/[^/]+\.ts))$|test\/scripts\/(?:format-generated-module|install-ps1|npm-runner|openclaw-cross-os-release-workflow|pnpm-runner|ui|vitest-process-group)\.test\.ts$|package\.json$|pnpm-lock\.yaml$|pnpm-workspace\.yaml$|\.github\/workflows\/(?:ci|openclaw-cross-os-release-checks-reusable)\.yml$|\.github\/actions\/setup-node-env\/action\.yml$|\.github\/actions\/setup-pnpm-store-cache\/action\.yml$)/;
+  /^(src\/config\/sessions\/(?:session-accessor\.sqlite-archive|store\.session-lifecycle-mutation\.test)\.ts$|src\/process\/|src\/infra\/windows-install-roots\.ts$|src\/shared\/(?:import-specifier|runtime-import)(?:\.test)?\.ts$|scripts\/(?:install\.ps1|openclaw-cross-os-release-checks\.ts|github\/run-openclaw-cross-os-release-checks\.sh|(?:npm-runner|pnpm-runner|ui|vitest-process-group)\.(?:mjs|js)|lib\/(?:format-generated-module\.mjs|cross-os-release-checks\/[^/]+\.ts))$|test\/scripts\/(?:format-generated-module|install-ps1|npm-runner|openclaw-cross-os-release-workflow|pnpm-runner|ui|vitest-process-group)\.test\.ts$|package\.json$|pnpm-lock\.yaml$|pnpm-workspace\.yaml$|\.github\/workflows\/(?:ci|openclaw-cross-os-release-checks-reusable)\.yml$|\.github\/actions\/setup-node-env\/action\.yml$|\.github\/actions\/setup-pnpm-store-cache\/action\.yml$)/;
 const WINDOWS_TEST_SCOPE_RE =
-  /^(src\/process\/(?:exec\.windows|windows-command)\.test\.ts$|src\/infra\/windows-install-roots\.test\.ts$|src\/shared\/runtime-import\.test\.ts$|test\/scripts\/(?:format-generated-module|npm-runner|openclaw-cross-os-release-workflow|pnpm-runner|ui|vitest-process-group)\.test\.ts$)/;
+  /^(src\/config\/sessions\/store\.session-lifecycle-mutation\.test\.ts$|src\/process\/(?:exec\.windows|windows-command)\.test\.ts$|src\/infra\/windows-install-roots\.test\.ts$|src\/shared\/runtime-import\.test\.ts$|test\/scripts\/(?:format-generated-module|npm-runner|openclaw-cross-os-release-workflow|pnpm-runner|ui|vitest-process-group)\.test\.ts$)/;
 const WINDOWS_DAEMON_SCOPE_RE =
   /^src\/daemon\/(?:schtasks(?:[-.][^/]+)?|runtime-hints\.windows-paths(?:\.test)?|test-helpers\/schtasks-(?:base-mocks|fixtures))\.ts$/;
 const CONTROL_UI_I18N_SCOPE_RE =
diff --git a/src/config/sessions/session-accessor.sqlite-archive.ts b/src/config/sessions/session-accessor.sqlite-archive.ts
index bfc6ce7ca7ec..57048fd2a76d 100644
--- a/src/config/sessions/session-accessor.sqlite-archive.ts
+++ b/src/config/sessions/session-accessor.sqlite-archive.ts
@@ -102,8 +102,7 @@ function writeSqliteTranscriptArchive(params: {
     }
     const tempPath = `${archivePath}.${randomUUID()}.tmp`;
     try {
-      fs.writeFileSync(tempPath, encoded.bytes, { flag: "wx", mode: 0o600 });
-      fsyncRegularFile(tempPath);
+      writeDurableFileExclusive(tempPath, encoded.bytes);
       fs.renameSync(tempPath, archivePath);
       fsyncDirectory(params.archiveDirectory);
       return archivePath;
@@ -118,9 +117,12 @@ function writeSqliteTranscriptArchive(params: {
   throw new Error(`Could not create SQLite transcript archive for ${params.sessionId}`);
 }
 
-function fsyncRegularFile(filePath: string): void {
-  const fd = fs.openSync(filePath, "r");
+// Windows rejects fsync on read-only handles, so keep the exclusive writable
+// descriptor open through both the write and durability boundary.
+function writeDurableFileExclusive(filePath: string, content: Buffer): void {
+  const fd = fs.openSync(filePath, "wx", 0o600);
   try {
+    fs.writeFileSync(fd, content);
     fs.fsyncSync(fd);
   } finally {
     fs.closeSync(fd);
diff --git a/src/config/sessions/store.session-lifecycle-mutation.test.ts b/src/config/sessions/store.session-lifecycle-mutation.test.ts
index 36118f930e5a..a9a64755bd5e 100644
--- a/src/config/sessions/store.session-lifecycle-mutation.test.ts
+++ b/src/config/sessions/store.session-lifecycle-mutation.test.ts
@@ -319,7 +319,7 @@ describe("session store lifecycle mutations", () => {
     expect(readSearchState()).toEqual({ fts: [], watermarks: [] });
   });
 
-  it("durably writes SQLite transcript archives before deleting entry rows", async () => {
+  it("fsyncs SQLite transcript archives through their writable descriptor before deletion", async () => {
     const now = Date.now();
     await replaceSessionEntry(
       { sessionKey: "agent:main:durable-delete", storePath },
@@ -333,17 +333,19 @@ describe("session store lifecycle mutations", () => {
       [createTranscriptEvent("durable-delete-session", "durable archive first")],
     );
 
-    const originalWriteFileSync = fs.writeFileSync;
-    const entryObservedDuringArchiveWrite: boolean[] = [];
-    const writeSpy = vi.spyOn(fs, "writeFileSync").mockImplementation((...args) => {
-      const filePath = String(args[0]);
-      if (filePath.includes("durable-delete-session.jsonl.deleted.")) {
-        entryObservedDuringArchiveWrite.push(
+    const originalRenameSync = fs.renameSync;
+    const entryObservedDuringArchiveRename: boolean[] = [];
+    const openSpy = vi.spyOn(fs, "openSync");
+    const fsyncSpy = vi.spyOn(fs, "fsyncSync");
+    const renameSpy = vi.spyOn(fs, "renameSync").mockImplementation((...args) => {
+      const archivePath = String(args[1]);
+      if (archivePath.includes("durable-delete-session.jsonl.deleted.")) {
+        entryObservedDuringArchiveRename.push(
           loadSessionEntry({ sessionKey: "agent:main:durable-delete", storePath })?.sessionId ===
             "durable-delete-session",
         );
       }
-      return originalWriteFileSync(...args);
+      return originalRenameSync(...args);
     });
 
     try {
@@ -358,9 +360,18 @@ describe("session store lifecycle mutations", () => {
 
       expect(result.deleted).toBe(true);
       expect(result.archivedTranscripts).toHaveLength(1);
-      expect(entryObservedDuringArchiveWrite).toEqual([true]);
+      expect(entryObservedDuringArchiveRename).toEqual([true]);
+      const archiveTempOpenIndexes = openSpy.mock.calls.flatMap((args, index) =>
+        String(args[0]).includes("durable-delete-session.jsonl.deleted.") ? [index] : [],
+      );
+      expect(archiveTempOpenIndexes).toHaveLength(1);
+      const archiveTempOpenIndex = archiveTempOpenIndexes[0] ?? -1;
+      expect(openSpy.mock.calls[archiveTempOpenIndex]?.[1]).toBe("wx");
+      expect(fsyncSpy).toHaveBeenCalledWith(openSpy.mock.results[archiveTempOpenIndex]?.value);
     } finally {
-      writeSpy.mockRestore();
+      renameSpy.mockRestore();
+      fsyncSpy.mockRestore();
+      openSpy.mockRestore();
     }
   });
 
diff --git a/src/scripts/ci-changed-scope.windows.test.ts b/src/scripts/ci-changed-scope.windows.test.ts
new file mode 100644
index 000000000000..55ab7d8e19a9
--- /dev/null
+++ b/src/scripts/ci-changed-scope.windows.test.ts
@@ -0,0 +1,18 @@
+// Windows CI scope tests cover paths with platform-specific runtime contracts.
+import { describe, expect, it } from "vitest";
+
+const { detectChangedScope } = await import("../../scripts/ci-changed-scope.mjs");
+
+describe("detectChangedScope Windows routing", () => {
+  it("routes SQLite transcript archive changes to Windows", () => {
+    for (const archivePath of [
+      "src/config/sessions/session-accessor.sqlite-archive.ts",
+      "src/config/sessions/store.session-lifecycle-mutation.test.ts",
+    ]) {
+      expect(detectChangedScope([archivePath]), archivePath).toMatchObject({
+        runNode: true,
+        runWindows: true,
+      });
+    }
+  });
+});
diff --git a/test/package-scripts.test.ts b/test/package-scripts.test.ts
index 4dadfe671039..ccfd31a4633c 100644
--- a/test/package-scripts.test.ts
+++ b/test/package-scripts.test.ts
@@ -169,6 +169,12 @@ describe("package scripts", () => {
     );
   });
 
+  it("runs SQLite transcript archive durability coverage in Windows CI", () => {
+    expect(readPackageJson().scripts["test:windows:ci"]).toContain(
+      "src/config/sessions/store.session-lifecycle-mutation.test.ts",
+    );
+  });
+
   it("runs cross-OS installer behavior coverage in Windows CI", () => {
     expect(readPackageJson().scripts["test:windows:ci"]).toContain(
       "test/scripts/openclaw-cross-os-installer.windows.test.ts",