diff --git a/api/chat.php b/api/chat.php
index 7d4fd37..2a0d16c 100644
--- a/api/chat.php
+++ b/api/chat.php
@@ -242,15 +242,15 @@ if ($action === 'admin_get_all') {
                 SUM(v.is_unread) as unread_count,
                 MAX(v.has_recharge) as has_recharge,
                 CASE 
-                    WHEN m.message LIKE '<img%' THEN '[图片消息]' 
-                    WHEN (m.message IS NULL OR m.message = '') AND MAX(v.has_recharge) = 1 THEN '[充值申请]'
-                    ELSE COALESCE(m.message, '新会话') 
+                    WHEN MAX(m.message) LIKE '<img%' THEN '[图片消息]' 
+                    WHEN (MAX(m.message) IS NULL OR MAX(m.message) = '') AND MAX(v.has_recharge) = 1 THEN '[充值申请]'
+                    ELSE COALESCE(MAX(m.message), '新会话') 
                 END as message, 
-                COALESCE(m.created_at, MAX(v.last_activity)) as created_at,
-                COALESCE(u.username, u.email, CONCAT('访客 ', COALESCE(NULLIF(MAX(v.effective_ip), ''), '0.0.0.0'))) as username, 
-                IFNULL(u.uid, '---') as uid, 
-                IFNULL(u.registration_ip, '---') as registration_ip,
-                IFNULL(r.remark, '') as remark,
+                COALESCE(MAX(m.created_at), MAX(v.last_activity)) as created_at,
+                COALESCE(MAX(u.username), MAX(u.email), CONCAT('访客 ', COALESCE(NULLIF(MAX(v.effective_ip), ''), '0.0.0.0'))) as username, 
+                IFNULL(MAX(u.uid), '---') as uid, 
+                IFNULL(MAX(u.registration_ip), '---') as registration_ip,
+                IFNULL(MAX(r.remark), '') as remark,
                 IFNULL(MAX(v.user_time), '---') as user_time
             FROM (
                 SELECT 
diff --git a/assets/pasted-20260222-083855-4141c55c.png b/assets/pasted-20260222-083855-4141c55c.png
new file mode 100644
index 0000000..9e72aba
Binary files /dev/null and b/assets/pasted-20260222-083855-4141c55c.png differ
diff --git a/db/config.php b/db/config.php
index 5668869..e9b57ac 100644
--- a/db/config.php
+++ b/db/config.php
@@ -108,6 +108,13 @@ function ensureSchema() {
             }
         }
 
+        // --- messages table ---
+        $stmt = $db->query("DESCRIBE messages");
+        $columns = $stmt->fetchAll(PDO::FETCH_COLUMN);
+        if (!in_array('is_read', $columns)) {
+            $db->exec("ALTER TABLE messages ADD COLUMN is_read TINYINT(1) DEFAULT 0");
+        }
+
         // --- chat_visitors table ---
         $stmt = $db->query("SHOW INDEX FROM chat_visitors WHERE Key_name = 'session_id_unique'");
         if (!$stmt->fetch()) {