diff --git a/src/infra/session-cost-usage.test.ts b/src/infra/session-cost-usage.test.ts
index ba9e10b1f4a..bacb2ead581 100644
--- a/src/infra/session-cost-usage.test.ts
+++ b/src/infra/session-cost-usage.test.ts
@@ -231,6 +231,92 @@ describe("session cost usage", () => {
     });
   });
 
+  it("includes reset and deleted transcript files in aggregate usage summaries", async () => {
+    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-cost-archived-"));
+    const sessionsDir = path.join(root, "agents", "main", "sessions");
+    await fs.mkdir(sessionsDir, { recursive: true });
+    const day = new Date("2026-03-13T10:00:00.000Z");
+
+    const files = [
+      "sess-active.jsonl",
+      "sess-reset.jsonl.reset.2026-03-13T10-05-00.000Z",
+      "sess-deleted.jsonl.deleted.2026-03-13T10-10-00.000Z",
+    ];
+
+    for (const [i, name] of files.entries()) {
+      const filePath = path.join(sessionsDir, name);
+      await fs.writeFile(
+        filePath,
+        JSON.stringify({
+          type: "message",
+          timestamp: day.toISOString(),
+          message: {
+            role: "assistant",
+            provider: "openai",
+            model: "gpt-5.2",
+            usage: {
+              input: 10 + i,
+              output: 20 + i,
+              totalTokens: 30 + i * 2,
+              cost: { total: 0.01 * (i + 1) },
+            },
+          },
+        }),
+        "utf-8",
+      );
+    }
+
+    await withStateDir(root, async () => {
+      const summary = await loadCostUsageSummary({
+        startMs: new Date("2026-03-13T00:00:00.000Z").getTime(),
+        endMs: new Date("2026-03-13T23:59:59.999Z").getTime(),
+      });
+      expect(summary.daily).toHaveLength(1);
+      expect(summary.totals.totalTokens).toBe(96);
+      expect(summary.totals.totalCost).toBeCloseTo(0.06, 8);
+    });
+  });
+
+  it("discovers archived reset/deleted transcripts and preserves base session ids", async () => {
+    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-discover-archived-"));
+    const sessionsDir = path.join(root, "agents", "main", "sessions");
+    await fs.mkdir(sessionsDir, { recursive: true });
+
+    const files = [
+      ["sess-active.jsonl", "active hello"],
+      ["sess-reset.jsonl.reset.2026-03-13T10-05-00.000Z", "reset hello"],
+      ["sess-deleted.jsonl.deleted.2026-03-13T10-10-00.000Z", "deleted hello"],
+    ] as const;
+
+    for (const [name, text] of files) {
+      const filePath = path.join(sessionsDir, name);
+      await fs.writeFile(
+        filePath,
+        JSON.stringify({
+          type: "message",
+          timestamp: "2026-03-13T10:00:00.000Z",
+          message: {
+            role: "user",
+            content: text,
+          },
+        }),
+        "utf-8",
+      );
+    }
+
+    await withStateDir(root, async () => {
+      const sessions = await discoverAllSessions({
+        startMs: new Date("2026-03-13T00:00:00.000Z").getTime(),
+      });
+      const ids = sessions.map((session) => session.sessionId).sort();
+      expect(ids).toEqual(["sess-active", "sess-deleted", "sess-reset"]);
+      const reset = sessions.find((session) => session.sessionId === "sess-reset");
+      const deleted = sessions.find((session) => session.sessionId === "sess-deleted");
+      expect(reset?.firstUserMessage).toContain("reset hello");
+      expect(deleted?.firstUserMessage).toContain("deleted hello");
+    });
+  });
+
   it("resolves non-main absolute sessionFile using explicit agentId for cost summary", async () => {
     const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-cost-agent-"));
     const workerSessionsDir = path.join(root, "agents", "worker1", "sessions");
diff --git a/src/infra/session-cost-usage.ts b/src/infra/session-cost-usage.ts
index 230ebd60c2e..e4b9b4af466 100644
--- a/src/infra/session-cost-usage.ts
+++ b/src/infra/session-cost-usage.ts
@@ -53,6 +53,16 @@ export type {
   SessionUsageTimeSeries,
 } from "./session-cost-usage.types.js";
 
+const SESSION_TRANSCRIPT_FILE_RE = /\.jsonl(?:\.(?:reset|deleted)\..+)?$/;
+
+const isSessionTranscriptFilename = (name: string): boolean =>
+  SESSION_TRANSCRIPT_FILE_RE.test(name);
+
+const deriveSessionIdFromFilename = (name: string): string => {
+  const match = name.match(/^(.*?\.jsonl)(?:\.(?:reset|deleted)\..+)?$/);
+  return match ? match[1].slice(0, -6) : name.replace(/\.jsonl$/, "");
+};
+
 const emptyTotals = (): CostUsageTotals => ({
   input: 0,
   output: 0,
@@ -318,7 +328,7 @@ export async function loadCostUsageSummary(params?: {
   const files = (
     await Promise.all(
       entries
-        .filter((entry) => entry.isFile() && entry.name.endsWith(".jsonl"))
+        .filter((entry) => entry.isFile() && isSessionTranscriptFilename(entry.name))
         .map(async (entry) => {
           const filePath = path.join(sessionsDir, entry.name);
           const stats = await fs.promises.stat(filePath).catch(() => null);
@@ -393,7 +403,7 @@ export async function discoverAllSessions(params?: {
   const discovered: DiscoveredSession[] = [];
 
   for (const entry of entries) {
-    if (!entry.isFile() || !entry.name.endsWith(".jsonl")) {
+    if (!entry.isFile() || !isSessionTranscriptFilename(entry.name)) {
       continue;
     }
 
@@ -409,8 +419,8 @@ export async function discoverAllSessions(params?: {
     }
     // Do not exclude by endMs: a session can have activity in range even if it continued later.
 
-    // Extract session ID from filename (remove .jsonl)
-    const sessionId = entry.name.slice(0, -6);
+    // Extract session ID from filename, preserving base session id for archived reset/deleted transcripts.
+    const sessionId = deriveSessionIdFromFilename(entry.name);
 
     // Try to read first user message for label extraction
     let firstUserMessage: string | undefined;