fix: archive old transcript files on /new and /reset (#14949)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 4724df7dea
Co-authored-by: mcaxtr <7562095+mcaxtr@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/auto-reply/reply/session-resets.test.ts

@@ -583,6 +583,49 @@ describe("initSessionState preserves behavior overrides across /new and /reset",
     expect(result.sessionEntry.ttsAuto).toBe("on");
   });
 
+  it("archives previous transcript file on /new reset", async () => {
+    const storePath = await createStorePath("openclaw-reset-archive-");
+    const sessionKey = "agent:main:telegram:dm:user-archive";
+    const existingSessionId = "existing-session-archive";
+    await seedSessionStoreWithOverrides({
+      storePath,
+      sessionKey,
+      sessionId: existingSessionId,
+      overrides: {},
+    });
+    const transcriptPath = path.join(path.dirname(storePath), `${existingSessionId}.jsonl`);
+    await fs.writeFile(
+      transcriptPath,
+      `${JSON.stringify({ message: { role: "user", content: "hello" } })}\n`,
+      "utf-8",
+    );
+
+    const cfg = {
+      session: { store: storePath, idleMinutes: 999 },
+    } as OpenClawConfig;
+
+    const result = await initSessionState({
+      ctx: {
+        Body: "/new",
+        RawBody: "/new",
+        CommandBody: "/new",
+        From: "user-archive",
+        To: "bot",
+        ChatType: "direct",
+        SessionKey: sessionKey,
+        Provider: "telegram",
+        Surface: "telegram",
+      },
+      cfg,
+      commandAuthorized: true,
+    });
+
+    expect(result.isNewSession).toBe(true);
+    expect(result.resetTriggered).toBe(true);
+    const files = await fs.readdir(path.dirname(storePath));
+    expect(files.some((f) => f.startsWith(`${existingSessionId}.jsonl.reset.`))).toBe(true);
+  });
+
   it("idle-based new session does NOT preserve overrides (no entry to read)", async () => {
     const storePath = await createStorePath("openclaw-idle-no-preserve-");
     const sessionKey = "agent:main:telegram:dm:new-user";

src/auto-reply/reply/session.ts

@@ -26,6 +26,7 @@ import {
   type SessionScope,
   updateSessionStore,
 } from "../../config/sessions.js";
+import { archiveSessionTranscripts } from "../../gateway/session-utils.fs.js";
 import { deliverSessionMaintenanceWarning } from "../../infra/session-maintenance-warning.js";
 import { getGlobalHookRunner } from "../../plugins/hook-runner-global.js";
 import { normalizeMainKey } from "../../routing/session-key.js";
@@ -380,6 +381,17 @@ export async function initSessionState(params: {
     },
   );
 
+  // Archive old transcript so it doesn't accumulate on disk (#14869).
+  if (previousSessionEntry?.sessionId) {
+    archiveSessionTranscripts({
+      sessionId: previousSessionEntry.sessionId,
+      storePath,
+      sessionFile: previousSessionEntry.sessionFile,
+      agentId,
+      reason: "reset",
+    });
+  }
+
   const sessionCtx: TemplateContext = {
     ...ctx,
     // Keep BodyStripped aligned with Body (best default for agent prompts).