1.没置顶的消息，到最上面去了 2.无法转发图片 3.用户ID 是一串字母+数字 4.视频无法显示 5.消息无法置顶 6.可以引用文字，无法艾特用户 7.图片点开只能显示一半 8.转发不能多选，只能一个个转发 9.转发有转发提示，需取消

public/api/messages.php

@@ -1066,7 +1066,7 @@ function loadNativeGroupMessages(PDO $db, string $userId, string $groupId, int $
     }
 
     $table = imUserMessagesTable($userId);
-    $scanLimit = min(max($limit * 4, $limit), 400);
+    $scanLimit = min(max($limit * 4, $limit), 5000);
     $statement = $db->prepare(
         'select `_mid`, `_dt` from `' . $table . '`'
         . ' where `_uid` = ? and `_type` = 1 and `_line` = 0 and `_target` = ?'
@@ -1626,16 +1626,26 @@ function messageSyncResult(
                 'create table if not exists `t_web_pinned_messages` ('
                 . '`user_id` varchar(64) not null, `conversation_type` varchar(16) not null,'
                 . '`target_id` varchar(128) not null, `message_uid` varchar(32) not null,'
+                . '`message_json` text null,'
                 . '`updated_at_ms` bigint not null, primary key (`user_id`, `conversation_type`, `target_id`)'
                 . ') engine=InnoDB default charset=utf8mb4'
             );
+            try {
+                imAppDb()->exec('alter table `t_web_pinned_messages` add column `message_json` text null after `message_uid`');
+            } catch (Throwable) {
+                // The column already exists.
+            }
             $statement = imAppDb()->prepare(
-                'select `message_uid` from `t_web_pinned_messages` where `user_id` = ? and `conversation_type` = ? and `target_id` = ? limit 1'
+                'select `message_uid`, `message_json` from `t_web_pinned_messages` where `user_id` = ? and `conversation_type` = ? and `target_id` = ? limit 1'
             );
             $statement->execute([$userId, $conversationType, $targetId]);
-            $result['pinnedMessageUid'] = (string)($statement->fetchColumn() ?: '');
+            $pinnedRow = $statement->fetch();
+            $result['pinnedMessageUid'] = (string)($pinnedRow['message_uid'] ?? '');
+            $pinnedMessage = json_decode((string)($pinnedRow['message_json'] ?? ''), true);
+            $result['pinnedMessage'] = is_array($pinnedMessage) ? $pinnedMessage : null;
         } catch (Throwable) {
             $result['pinnedMessageUid'] = '';
+            $result['pinnedMessage'] = null;
         }
     }
 
@@ -1645,7 +1655,7 @@ function messageSyncResult(
 $payload = readJsonPayload();
 $userId = trim((string)($payload['userId'] ?? ''));
 $target = trim((string)($payload['target'] ?? ''));
-$limit = clampLimit($payload['limit'] ?? 50, 50, 100);
+$limit = clampLimit($payload['limit'] ?? 1000, 50, 1000);
 $markRead = payloadBool($payload['markRead'] ?? false);
 $includeConversations = payloadBool($payload['includeConversations'] ?? false);
 $conversationType = normalizeConversationType($payload['conversationType'] ?? $payload['type'] ?? 0);