diff --git a/extensions/feishu/src/dedup.test.ts b/extensions/feishu/src/dedup.test.ts
index 1b3f1c749c82..6fc57f4ef4d3 100644
--- a/extensions/feishu/src/dedup.test.ts
+++ b/extensions/feishu/src/dedup.test.ts
@@ -12,7 +12,7 @@ import {
   hasProcessedFeishuMessage,
   testingHooks,
   tryRecordMessagePersistent,
-  warmupDedupFromDisk,
+  warmupDedupFromPluginState,
 } from "./dedup.js";
 import { setFeishuRuntime } from "./runtime.js";
 
@@ -59,7 +59,7 @@ describe("Feishu persistent dedupe", () => {
     await expect(tryRecordMessagePersistent("msg-2", "account-a")).resolves.toBe(true);
     testingHooks.resetFeishuDedupMemoryForTests();
 
-    await expect(warmupDedupFromDisk("account-a")).resolves.toBe(1);
+    await expect(warmupDedupFromPluginState("account-a")).resolves.toBe(1);
     await expect(tryRecordMessagePersistent("msg-2", "account-a")).resolves.toBe(false);
   });
 
@@ -73,7 +73,7 @@ describe("Feishu persistent dedupe", () => {
     await expect(hasProcessedFeishuMessage("msg-3", "account-a")).resolves.toBe(false);
   });
 
-  it("imports legacy JSON dedupe entries before checking plugin state", async () => {
+  it("ignores legacy JSON dedupe files at runtime", async () => {
     vi.useFakeTimers();
     vi.setSystemTime(2_000);
     const legacyPath = path.join(tempDir as string, "feishu", "dedup", "account-a.json");
@@ -87,8 +87,8 @@ describe("Feishu persistent dedupe", () => {
       "utf8",
     );
 
-    await expect(hasProcessedFeishuMessage("msg-legacy", "account-a")).resolves.toBe(true);
-    await expect(tryRecordMessagePersistent("msg-legacy", "account-a")).resolves.toBe(false);
+    await expect(hasProcessedFeishuMessage("msg-legacy", "account-a")).resolves.toBe(false);
+    await expect(tryRecordMessagePersistent("msg-legacy", "account-a")).resolves.toBe(true);
     await expect(hasProcessedFeishuMessage("msg-expired", "account-a")).resolves.toBe(false);
   });
 });
diff --git a/extensions/feishu/src/dedup.ts b/extensions/feishu/src/dedup.ts
index 71c82f94a537..dc9bf1486343 100644
--- a/extensions/feishu/src/dedup.ts
+++ b/extensions/feishu/src/dedup.ts
@@ -1,7 +1,4 @@
 import { createHash } from "node:crypto";
-import os from "node:os";
-import path from "node:path";
-import { loadJsonFile } from "openclaw/plugin-sdk/json-store";
 import type { PluginStateSyncKeyedStore } from "openclaw/plugin-sdk/plugin-state-runtime";
 import {
   releaseFeishuMessageProcessing,
@@ -20,11 +17,8 @@ type FeishuDedupStoreEntry = {
 };
 
 const memory = new Map<string, number>();
-const importedLegacyNamespaces = new Set<string>();
 const cachedDedupStores = new Map<string, PluginStateSyncKeyedStore<FeishuDedupStoreEntry>>();
 
-type LegacyDedupeData = Record<string, number>;
-
 function normalizeMessageId(messageId: string | undefined | null): string | null {
   const trimmed = messageId?.trim();
   return trimmed ? trimmed : null;
@@ -34,22 +28,6 @@ function normalizeNamespace(namespace?: string): string {
   return namespace?.trim() || "global";
 }
 
-function resolveLegacyStateDir(env: NodeJS.ProcessEnv = process.env): string {
-  const stateOverride = env.OPENCLAW_STATE_DIR?.trim();
-  if (stateOverride) {
-    return stateOverride;
-  }
-  if (env.VITEST || env.NODE_ENV === "test") {
-    return path.join(os.tmpdir(), ["openclaw-vitest", String(process.pid)].join("-"));
-  }
-  return path.join(os.homedir(), ".openclaw");
-}
-
-function resolveLegacyNamespaceFilePath(namespace: string): string {
-  const safe = namespace.replace(/[^a-zA-Z0-9_-]/g, "_");
-  return path.join(resolveLegacyStateDir(), "feishu", "dedup", `${safe}.json`);
-}
-
 function pluginStateNamespace(namespace: string): string {
   return `dedup.${namespace.replace(/[^a-zA-Z0-9_-]/g, "_")}`;
 }
@@ -116,52 +94,6 @@ function hasMemory(namespace: string, messageId: string, now = Date.now()): bool
   return false;
 }
 
-function sanitizeLegacyDedupeData(value: unknown): LegacyDedupeData {
-  if (!value || typeof value !== "object" || Array.isArray(value)) {
-    return {};
-  }
-  const out: LegacyDedupeData = {};
-  for (const [key, seenAt] of Object.entries(value as Record<string, unknown>)) {
-    if (typeof seenAt === "number" && Number.isFinite(seenAt) && seenAt > 0) {
-      out[key] = seenAt;
-    }
-  }
-  return out;
-}
-
-function importLegacyDedupNamespace(
-  namespace: string,
-  now = Date.now(),
-  log?: (...args: unknown[]) => void,
-): void {
-  if (importedLegacyNamespaces.has(namespace)) {
-    return;
-  }
-
-  try {
-    const data = sanitizeLegacyDedupeData(loadJsonFile(resolveLegacyNamespaceFilePath(namespace)));
-    const store = openDedupStore(namespace);
-    for (const [messageId, seenAt] of Object.entries(data)) {
-      if (!isRecent(seenAt, now)) {
-        continue;
-      }
-      const key = dedupeStoreKey(namespace, messageId);
-      if (store.lookup(key) != null) {
-        continue;
-      }
-      store.register(
-        key,
-        { namespace, messageId, seenAt },
-        { ttlMs: Math.max(1, DEDUP_TTL_MS - (now - seenAt)) },
-      );
-    }
-    importedLegacyNamespaces.add(namespace);
-  } catch (error) {
-    importedLegacyNamespaces.delete(namespace);
-    log?.(`feishu-dedup: legacy state import failed: ${String(error)}`);
-  }
-}
-
 export { releaseFeishuMessageProcessing, tryBeginFeishuMessageProcessing };
 
 export async function claimUnprocessedFeishuMessage(params: {
@@ -259,7 +191,6 @@ export async function tryRecordMessagePersistent(
     return true;
   }
   const now = Date.now();
-  importLegacyDedupNamespace(normalizedNamespace, now, log);
   if (hasMemory(normalizedNamespace, normalizedMessageId, now)) {
     return false;
   }
@@ -318,7 +249,6 @@ async function hasRecordedMessagePersistent(
     return false;
   }
   const now = Date.now();
-  importLegacyDedupNamespace(normalizedNamespace, now, log);
   if (hasMemory(normalizedNamespace, normalizedMessageId, now)) {
     return true;
   }
@@ -337,7 +267,7 @@ async function hasRecordedMessagePersistent(
   }
 }
 
-export async function warmupDedupFromDisk(
+export async function warmupDedupFromPluginState(
   namespace: string,
   log?: (...args: unknown[]) => void,
 ): Promise<number> {
@@ -345,7 +275,6 @@ export async function warmupDedupFromDisk(
   try {
     let loaded = 0;
     const now = Date.now();
-    importLegacyDedupNamespace(normalizedNamespace, now, log);
     for (const entry of openDedupStore(normalizedNamespace).entries()) {
       if (entry.value.namespace !== normalizedNamespace || !isRecent(entry.value.seenAt, now)) {
         continue;
@@ -363,7 +292,6 @@ export async function warmupDedupFromDisk(
 export const testingHooks = {
   resetFeishuDedupForTests() {
     memory.clear();
-    importedLegacyNamespaces.clear();
     for (const store of cachedDedupStores.values()) {
       store.clear();
     }
diff --git a/extensions/feishu/src/monitor.account.ts b/extensions/feishu/src/monitor.account.ts
index e26bcafd54a5..927cae0665cf 100644
--- a/extensions/feishu/src/monitor.account.ts
+++ b/extensions/feishu/src/monitor.account.ts
@@ -14,7 +14,7 @@ import { isRecord, readString } from "./comment-shared.js";
 import {
   hasProcessedFeishuMessage,
   recordProcessedFeishuMessage,
-  warmupDedupFromDisk,
+  warmupDedupFromPluginState,
 } from "./dedup.js";
 import { applyBotIdentityState, startBotIdentityRecovery } from "./monitor.bot-identity.js";
 import { createFeishuBotMenuHandler } from "./monitor.bot-menu-handler.js";
@@ -469,9 +469,9 @@ export async function monitorSingleAccount(params: MonitorSingleAccountParams):
     throw new Error(`Feishu account "${accountId}" webhook mode requires encryptKey`);
   }
 
-  const warmupCount = await warmupDedupFromDisk(accountId, log);
+  const warmupCount = await warmupDedupFromPluginState(accountId, log);
   if (warmupCount > 0) {
-    log(`feishu[${accountId}]: dedup warmup loaded ${warmupCount} entries from disk`);
+    log(`feishu[${accountId}]: dedup warmup loaded ${warmupCount} entries from plugin state`);
   }
 
   let threadBindingManager: ReturnType<typeof createFeishuThreadBindingManager> | null | undefined;