diff --git a/ChangeLog.md b/ChangeLog.md
index 4e76c0a..c2dd68e 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -3,6 +3,8 @@
 ## 1.0.5
  * 粗暴地加入了“关注问题”的 记录/可视化的功能
  * 略微优化了时间图的显示
+ * 活动时间记录逻辑修改（虽然没有暴露给你们使用）
+ * 加入了恼人的升级提示
 
 ## 1.0.4
  * 点赞列表界面增加自动检测功能。
diff --git a/README.md b/README.md
index 768a2d4..95ece3d 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,6 @@
 
  * 本地数据库过大时，导入导出页面的`快速导入`/`快速导出`功能将不可靠（容易导致插件崩溃），需要用[自带工具](./DBExportor/)进行导出。
    工具基于Asp.net core 2.0，请自行准备编译环境。
-   大数据库的导入未经测试，风险请自行承担。
 
 ## Dependency
  * [Dexie.js](http://dexie.org/) A Minimalistic Wrapper for IndexedDB [Apache License 2.0](./License/Dexie.license)
diff --git a/ZhiHuExt/CoreDB.js b/ZhiHuExt/CoreDB.js
index 8051c75..d6f58cf 100644
--- a/ZhiHuExt/CoreDB.js
+++ b/ZhiHuExt/CoreDB.js
@@ -164,6 +164,27 @@ class ZhiHuDB
             this[table] = this.db[table];
     }
 
+    /**
+     * @param {Zan[]} data
+     * @param {Map<string,number[]>} acttime
+     */
+    static formActTime(data, acttime)
+    {
+        if (!data)
+            return;
+        for (let idx = 0; idx < data.length; ++idx)
+        {
+            const act = data[idx];
+            const oldtime = acttime.get(act.from);
+            if (!oldtime)
+                acttime.set(act.from, [act.time, act.time]);
+            else if (act.time > oldtime[0])
+                acttime.set(act.from, [act.time, oldtime[1]]);
+            else if (act.time < oldtime[1])
+                acttime.set(act.from, [oldtime[0], act.time]);
+        }
+    }
+
     /**
      * @param {string} target
      * @param {object[] | object | StandardDB} data
@@ -177,22 +198,18 @@ class ZhiHuDB
             Object.entries(data).forEach(([key, val]) => sum += this.insert(key, val));
             if (notify)
                 notify(sum);
-            if (data.zans && data.zanarts && data.followqsts)
+            /**@type {Map<string,number[]>} */
+            const acttime = new Map();
+            ZhiHuDB.formActTime(data.zans, acttime);
+            ZhiHuDB.formActTime(data.zanarts, acttime);
+            ZhiHuDB.formActTime(data.followqsts, acttime);
+            if (acttime.size > 0)
             {
-                /**@type {Map<string,number[]>} */
-                const acttime = new Map();
-                const curtime = new Date().toUTCSeconds();
-                data.zans.concat(data.zanarts).concat(data.followqsts).forEach(act =>
+                const recs = [];
+                for (const entry of acttime)
                 {
-                    const oldtime = acttime.get(act.from);
-                    if (!oldtime)
-                        acttime.set(act.from, [act.time, act.time]);
-                    else if (act.time > oldtime[0])
-                        acttime.set(act.from, [act.time, oldtime[1]]);
-                    else if (act.time < oldtime[1])
-                        acttime.set(act.from, [oldtime[0], act.time]);
-                });
-                const recs = Array.from(acttime.entries()).map(x => ({ id: x[0], new: x[1][0], old: x[1][1] }));
+                    recs.push({ id: entry[0], new: entry[1][0], old: entry[1][1]});
+                };
                 this.db.rectime.bulkPut(recs);
             }
             return sum;
diff --git a/ZhiHuExt/background.js b/ZhiHuExt/background.js
index 3fd6b9e..0bef977 100644
--- a/ZhiHuExt/background.js
+++ b/ZhiHuExt/background.js
@@ -14,7 +14,32 @@ function clearBadge()
 {
     chrome.browserAction.setBadgeText({ text: "" });
 }
-
+/**@param {string} str */
+function strToVer(str)
+{
+    const verstr = str.replace(/[^0-9.]/g, "").split(".").map(Number);
+    return verstr[0] * 10000 + verstr[1] * 100 + verstr[2];
+}
+async function getVersion()
+{
+    const curver = strToVer(chrome.runtime.getManifest().version);
+    try
+    {
+        const resp = await fetch("https://api.github.com/repos/XZiar/ZhiHuExt/releases");
+        const releases = await resp.json()
+        console.log("releases", releases);
+        releases.forEach(release => release.pubTime = new Date(release.published_at));
+        releases.sort((a, b) => a.pubTime < b.pubTime);
+        const newver = strToVer(releases[0].tag_name);
+        console.log("latest release version", newver);
+        return { curver: curver, newver: newver };
+    }
+    catch (e)
+    {
+        console.warn(e);
+        return { curver: curver, newver: 0 };
+    }
+}
 
 const db = new ZhiHuDB("ZhihuDB", [
     {
@@ -228,6 +253,9 @@ chrome.runtime.onMessage.addListener((request, sender, sendResponse) =>
                 sendResponse(result);
             });
             return true;
+        case "chkver":
+            getVersion().then(result => sendResponse(result));
+            return true;
         case "chkspam":
             {
                 if (request.target === "users")
@@ -487,9 +515,29 @@ chrome.runtime.onMessageExternal.addListener(
         }
     });
 
-$(document).ready(function ()
+(async function ()
 {
-    new Clipboard('#copyBtn');
-});
+    $(document).ready(() =>
+    {
+        new Clipboard('#copyBtn');
+    });
+    const verinfo = await getVersion();
+    if (verinfo.curver < verinfo.newver)
+    {
+        chrome.notifications.create("UpdInfo",
+            {
+                type: "basic",
+                title: "銆愮煡涔庣柉鐗涚梾銆戞洿鏂版彁绀�",
+                message: `鎻掍欢浼间箮鍙戝竷鏂扮増鏈簡锛屽揩鍘荤湅鐪嬩綔鑰呭張鍔犱簡浠�涔堝崕鑰屼笉瀹炵殑鍔熻兘鍚э紵锛乣,
+                iconUrl: "icon.png"
+            });
+    }
+})();
+
+chrome.notifications.onButtonClicked.addListener(notificationId =>
+{
+    if (notificationId === "UpdInfo")
+        chrome.tabs.create({ active: true, url: "https://www.github.com/XZiar/ZhiHuExt/releases" });
+}); 
 
 
diff --git a/ZhiHuExt/manifest.json b/ZhiHuExt/manifest.json
index 2c74cd0..30f8dd8 100644
--- a/ZhiHuExt/manifest.json
+++ b/ZhiHuExt/manifest.json
@@ -25,7 +25,8 @@
     "*://127.0.0.1:*/",
     "tabs",
     "storage",
-    "downloads"
+    "downloads",
+    "notifications"
   ],
   "externally_connectable":
   {
diff --git a/ZhiHuExt/popup.js b/ZhiHuExt/popup.js
index 428f05c..6e80962 100644
--- a/ZhiHuExt/popup.js
+++ b/ZhiHuExt/popup.js
@@ -37,30 +37,14 @@ function verToStr(ver)
 {
     return `v${Math.floor(ver / 10000)}.${Math.floor((ver % 10000) / 10)}.${ver % 10}`;
 }
-
-(async function()
+chrome.runtime.sendMessage({ action: "chkver" }, resp =>
 {
-    const curver = 10005;
-    $("#curver").text(verToStr(curver));
-    try
+    $("#curver").text(verToStr(resp.curver));
+    $("#newver").text(verToStr(resp.newver));
+    if (curver < newver)
     {
-        const resp = await fetch("https://api.github.com/repos/XZiar/ZhiHuExt/releases");
-        const releases = await resp.json()
-        console.log(releases);
-        releases.forEach(release => release.pubTime = new Date(release.published_at));
-        releases.sort((a, b) => a.time < b.time);
-        const verstr = releases[0].tag_name.substring(1).split(".").map(Number);
-        const newver = verstr[0] * 10000 + verstr[1] * 100 + verstr[2];
-        console.log(newver);
-        $("#newver").text(verToStr(newver));
-        if (curver < newver)
-        {
-            $("#newver")[0].style.color = "red";
-            $("#upd").show();
-        }
+        $("#newver")[0].style.color = "red";
+        $("#upd").show();
     }
-    catch (e)
-    {
-        console.warn(e);
-    }
-})();
\ No newline at end of file
+});
+