fix(hooks): avoid session memory filename collisions

Add collision suffixes for session-memory fallback filenames so repeated same-minute reset/new captures do not overwrite earlier archives.

CHANGELOG.md

@@ -73,6 +73,7 @@ Docs: https://docs.openclaw.ai
 - Gateway/status: show recent supervisor restart handoffs in `openclaw gateway status --deep`, including JSON details, so clean service-managed restarts are reported as restart handoffs instead of opaque stopped-service diagnostics. Thanks @shakkernerd.
 - Providers/Fireworks: expose Kimi models as thinking-off-only and keep K2.5/K2.6 requests on `thinking: disabled`, so manual model switches do not send Fireworks-rejected `reasoning*` parameters. Refs #74289. Thanks @frankekn.
 - WhatsApp responsiveness: stop only verified stale local TUI clients when they degrade the Gateway event loop and delay replies. Thanks @vincentkoc.
+- Hooks/session-memory: add collision suffixes to fallback memory filenames so repeated `/new` or `/reset` captures in the same minute do not overwrite the earlier session archive. Thanks @vincentkoc.
 - Video generation: wait up to 20 minutes for slow fal/MiniMax queue-backed jobs, stop forwarding unsupported Google Veo generated-audio options, and normalize MiniMax `720P` requests to its supported `768P` resolution with the usual override warning/details instead of failing fallback.
 - Video generation: accept provider-specific aspect-ratio and resolution hints at the tool boundary, normalize `720P` to MiniMax's supported `768P`, and stop sending Google `generateAudio` on Gemini video requests so provider fallback can recover from model-specific parameter differences. Thanks @vincentkoc.
 - OpenAI/Google Meet: fail realtime voice connection attempts when the socket closes before `session.updated`, avoiding stuck Meet joins waiting on a bridge that never became ready. Thanks @vincentkoc.

src/hooks/bundled/session-memory/handler.test.ts

@@ -413,6 +413,41 @@ describe("session-memory hook", () => {
     });
   });
 
+  it("keeps same-minute fallback timestamp captures by adding a filename suffix", async () => {
+    await withEnvAsync({ TZ: "UTC" }, async () => {
+      const tempDir = await createCaseWorkspace("workspace");
+      const timestamp = new Date("2026-01-01T04:30:15.000Z");
+
+      await runNewWithPreviousSessionEntry({
+        tempDir,
+        timestamp,
+        previousSessionEntry: {
+          sessionId: "first-session",
+        },
+      });
+      await runNewWithPreviousSessionEntry({
+        tempDir,
+        timestamp,
+        previousSessionEntry: {
+          sessionId: "second-session",
+        },
+      });
+
+      const memoryDir = path.join(tempDir, "memory");
+      const files = await fs.readdir(memoryDir);
+      expect(files).toHaveLength(2);
+      expect(files).toContain("2026-01-01-0430.md");
+      expect(files).toContain("2026-01-01-0430-2.md");
+
+      await expect(
+        fs.readFile(path.join(memoryDir, "2026-01-01-0430.md"), "utf-8"),
+      ).resolves.toContain("- **Session ID**: first-session");
+      await expect(
+        fs.readFile(path.join(memoryDir, "2026-01-01-0430-2.md"), "utf-8"),
+      ).resolves.toContain("- **Session ID**: second-session");
+    });
+  });
+
   it("prefers workspaceDir from hook context when sessionKey points at main", async () => {
     const mainWorkspace = await createCaseWorkspace("workspace-main");
     const naviWorkspace = await createCaseWorkspace("workspace-navi");

src/hooks/bundled/session-memory/handler.ts

@@ -85,6 +85,28 @@ function formatLocalSessionTimestamp(date: Date): {
   };
 }
 
+async function resolveAvailableMemoryFilename(params: {
+  memoryDir: string;
+  dateStr: string;
+  slug: string;
+}): Promise<string> {
+  const basename = `${params.dateStr}-${params.slug}`;
+  let suffix = 1;
+
+  while (true) {
+    const filename = suffix === 1 ? `${basename}.md` : `${basename}-${suffix}.md`;
+    try {
+      await fs.access(path.join(params.memoryDir, filename));
+      suffix += 1;
+    } catch (err) {
+      if ((err as { code?: string }).code === "ENOENT") {
+        return filename;
+      }
+      throw err;
+    }
+  }
+}
+
 function resolveDisplaySessionKey(params: {
   cfg?: OpenClawConfig;
   workspaceDir?: string;
@@ -223,7 +245,7 @@ async function saveSessionMemoryNow(event: Parameters<HookHandler>[0]): Promise<
     }
 
     // Create filename with date and slug
-    const filename = `${dateStr}-${slug}.md`;
+    const filename = await resolveAvailableMemoryFilename({ memoryDir, dateStr, slug });
     const memoryFilePath = path.join(memoryDir, filename);
     log.debug("Memory file path resolved", {
       filename,