diff --git a/app/Console/Commands/SyncFileToManticore.php b/app/Console/Commands/SyncFileToManticore.php
index 25bd8d1ba..08b524938 100644
--- a/app/Console/Commands/SyncFileToManticore.php
+++ b/app/Console/Commands/SyncFileToManticore.php
@@ -74,7 +74,13 @@ class SyncFileToManticore extends Command
 
         do {
             $round++;
-            $lastId = $isIncremental ? intval(ManticoreKeyValue::get($lastKey, 0)) : 0;
+            try {
+                // 严格读取：读失败（引擎重启/不可达）不能当成 0，否则会从头重灌并把指针写回低值
+                $lastId = $isIncremental ? intval(ManticoreKeyValue::getStrict($lastKey)) : 0;
+            } catch (\RuntimeException $e) {
+                $this->error("读取同步指针失败，本轮终止（避免从头重灌）：" . $e->getMessage());
+                break;
+            }
 
             if ($round === 1) {
                 if ($lastId > 0) {
diff --git a/app/Console/Commands/SyncMsgToManticore.php b/app/Console/Commands/SyncMsgToManticore.php
index c9947586c..e9a046dde 100644
--- a/app/Console/Commands/SyncMsgToManticore.php
+++ b/app/Console/Commands/SyncMsgToManticore.php
@@ -81,7 +81,13 @@ class SyncMsgToManticore extends Command
         // 持续处理循环（增量模式下）
         do {
             $round++;
-            $lastId = $isIncremental ? intval(ManticoreKeyValue::get($lastKey, 0)) : 0;
+            try {
+                // 严格读取：读失败（引擎重启/不可达）不能当成 0，否则会从头重灌并把指针写回低值
+                $lastId = $isIncremental ? intval(ManticoreKeyValue::getStrict($lastKey)) : 0;
+            } catch (\RuntimeException $e) {
+                $this->error("读取同步指针失败，本轮终止（避免从头重灌）：" . $e->getMessage());
+                break;
+            }
 
             if ($round === 1) {
                 if ($lastId > 0) {
diff --git a/app/Console/Commands/SyncProjectToManticore.php b/app/Console/Commands/SyncProjectToManticore.php
index e8662f4d3..dd5179343 100644
--- a/app/Console/Commands/SyncProjectToManticore.php
+++ b/app/Console/Commands/SyncProjectToManticore.php
@@ -68,7 +68,13 @@ class SyncProjectToManticore extends Command
 
         do {
             $round++;
-            $lastId = $isIncremental ? intval(ManticoreKeyValue::get($lastKey, 0)) : 0;
+            try {
+                // 严格读取：读失败（引擎重启/不可达）不能当成 0，否则会从头重灌并把指针写回低值
+                $lastId = $isIncremental ? intval(ManticoreKeyValue::getStrict($lastKey)) : 0;
+            } catch (\RuntimeException $e) {
+                $this->error("读取同步指针失败，本轮终止（避免从头重灌）：" . $e->getMessage());
+                break;
+            }
 
             if ($round === 1) {
                 if ($lastId > 0) {
diff --git a/app/Console/Commands/SyncTaskToManticore.php b/app/Console/Commands/SyncTaskToManticore.php
index b319fb76e..2b64af233 100644
--- a/app/Console/Commands/SyncTaskToManticore.php
+++ b/app/Console/Commands/SyncTaskToManticore.php
@@ -68,7 +68,13 @@ class SyncTaskToManticore extends Command
 
         do {
             $round++;
-            $lastId = $isIncremental ? intval(ManticoreKeyValue::get($lastKey, 0)) : 0;
+            try {
+                // 严格读取：读失败（引擎重启/不可达）不能当成 0，否则会从头重灌并把指针写回低值
+                $lastId = $isIncremental ? intval(ManticoreKeyValue::getStrict($lastKey)) : 0;
+            } catch (\RuntimeException $e) {
+                $this->error("读取同步指针失败，本轮终止（避免从头重灌）：" . $e->getMessage());
+                break;
+            }
 
             if ($round === 1) {
                 if ($lastId > 0) {
diff --git a/app/Console/Commands/SyncUserToManticore.php b/app/Console/Commands/SyncUserToManticore.php
index 2f199dddf..aee068753 100644
--- a/app/Console/Commands/SyncUserToManticore.php
+++ b/app/Console/Commands/SyncUserToManticore.php
@@ -68,7 +68,13 @@ class SyncUserToManticore extends Command
 
         do {
             $round++;
-            $lastId = $isIncremental ? intval(ManticoreKeyValue::get($lastKey, 0)) : 0;
+            try {
+                // 严格读取：读失败（引擎重启/不可达）不能当成 0，否则会从头重灌并把指针写回低值
+                $lastId = $isIncremental ? intval(ManticoreKeyValue::getStrict($lastKey)) : 0;
+            } catch (\RuntimeException $e) {
+                $this->error("读取同步指针失败，本轮终止（避免从头重灌）：" . $e->getMessage());
+                break;
+            }
 
             if ($round === 1) {
                 if ($lastId > 0) {
diff --git a/app/Module/Manticore/ManticoreBase.php b/app/Module/Manticore/ManticoreBase.php
index 8b91c3588..fcf602807 100644
--- a/app/Module/Manticore/ManticoreBase.php
+++ b/app/Module/Manticore/ManticoreBase.php
@@ -598,6 +598,37 @@ class ManticoreBase
         );
     }
 
+    /**
+     * 查询单行（严格版）：连接/查询失败抛异常，而不是和「没有这一行」一样返回 null
+     *
+     * 用于「读不到就当默认值」会造成后果的场景，如同步命令读增量指针——
+     * 引擎不可达时若当成指针 0，会从头重灌全部数据。
+     *
+     * @param string $sql SQL语句
+     * @param array $params 参数
+     * @return array|null 单行结果；没有匹配行返回 null
+     * @throws \RuntimeException 连接或查询失败
+     */
+    public function queryOneStrict(string $sql, array $params = []): ?array
+    {
+        $failed = new \stdClass();
+        $result = $this->runWithRetry(
+            function (PDO $pdo) use ($sql, $params) {
+                $stmt = $pdo->prepare($sql);
+                $this->bindParams($stmt, $params);
+                $stmt->execute();
+                $row = $stmt->fetch();
+                return $row ? $this->convertNumericTypesRow($row) : null;
+            },
+            $failed,
+            ['sql' => $sql, 'params' => $params]
+        );
+        if ($result === $failed) {
+            throw new \RuntimeException('Manticore 不可达或查询失败');
+        }
+        return $result;
+    }
+
     /**
      * 转换结果集中的数值类型
      * PDO 默认将 BIGINT 等数值类型返回为字符串，这里统一转换
diff --git a/app/Module/Manticore/ManticoreKeyValue.php b/app/Module/Manticore/ManticoreKeyValue.php
index c9ec85499..bcf0cc867 100644
--- a/app/Module/Manticore/ManticoreKeyValue.php
+++ b/app/Module/Manticore/ManticoreKeyValue.php
@@ -34,6 +34,31 @@ class ManticoreKeyValue
         return $result ? $result['v'] : $default;
     }
 
+    /**
+     * 严格获取值：键不存在返回 null，引擎不可达/查询失败抛异常
+     *
+     * get() 对「键不存在」和「读取失败」都返回默认值，无法区分。同步命令用它读增量指针：
+     * 引擎重启期间读失败若当成 0，会从头重灌全部数据并把指针写回低值。
+     *
+     * @param string $key 键
+     * @return string|null 值；键不存在返回 null
+     * @throws \RuntimeException 引擎不可达或查询失败
+     */
+    public static function getStrict(string $key): ?string
+    {
+        if (!Apps::isInstalled("search")) {
+            throw new \RuntimeException('Manticore Search 未安装');
+        }
+
+        $instance = new ManticoreBase();
+        $result = $instance->queryOneStrict(
+            "SELECT v FROM key_values WHERE k = ?",
+            [$key]
+        );
+
+        return $result ? (string) $result['v'] : null;
+    }
+
     /**
      * 设置值
      *