diff --git a/main.py b/main.py
index a2ae68e..ea672d0 100644
--- a/main.py
+++ b/main.py
@@ -188,12 +188,8 @@ class QQGroupDailyAnalysis(Star):
             raise ValueError(f"群 {group_id}: 无法获取发送者 ID，拒绝存储消息")
         sender_id = str(sender_id)
 
-        # 3. 获取发送者名称（必需）
-        sender_name = event.get_sender_name()
-        if not sender_name:
-            raise ValueError(
-                f"群 {group_id}: 无法获取发送者名称 (sender_id={sender_id})，拒绝存储消息"
-            )
+        # 3. 获取发送者名称（昵称优先，必要时回退）
+        sender_name = self._resolve_sender_name(event, sender_id)
 
         # 4. 获取平台 ID（必需）
         platform_id = event.get_platform_id()
@@ -207,8 +203,55 @@ class QQGroupDailyAnalysis(Star):
                 f"群 {group_id}: 消息内容为空 (sender={sender_name})，拒绝存储"
             )
 
-        # 6. 存储到数据库
-        await self.context.message_history_manager.insert(
+        # 6. 临时调试日志：打印入库前关键信息
+        message_types = []
+        for part in message_parts:
+            if isinstance(part, dict):
+                message_types.append(str(part.get("type", "unknown")))
+
+        preview_parts: list[str] = []
+        for part in message_parts:
+            if not isinstance(part, dict):
+                continue
+
+            part_type = str(part.get("type", "unknown"))
+            if part_type in ("plain", "text"):
+                text = str(part.get("text", "")).strip()
+                if text:
+                    preview_parts.append(text)
+            elif part_type == "at":
+                target = str(
+                    part.get("target_id")
+                    or part.get("qq")
+                    or part.get("at_user_id")
+                    or ""
+                ).strip()
+                preview_parts.append(f"@{target}" if target else "@")
+            elif part_type == "image":
+                url = str(part.get("url", "")).strip()
+                preview_parts.append(f"[image]{url}" if url else "[image]")
+            else:
+                preview_parts.append(f"[{part_type}]")
+
+        preview_text = " ".join(preview_parts).strip()
+        if len(preview_text) > 300:
+            preview_text = preview_text[:300] + "...(truncated)"
+
+        msg_obj = getattr(event, "message_obj", None)
+        event_message_id = str(getattr(msg_obj, "message_id", "") or "")
+        unified_msg_origin = str(getattr(event, "unified_msg_origin", "") or "")
+
+        logger.info(
+            "[TEMP][HistoryStore][BeforeInsert] "
+            f"platform_id={platform_id} group_id={group_id} "
+            f"sender_id={sender_id} sender_name={sender_name} "
+            f"event_message_id={event_message_id} unified_msg_origin={unified_msg_origin} "
+            f"parts_count={len(message_parts)} part_types={message_types} "
+            f"content_preview={preview_text}"
+        )
+
+        # 7. 存储到数据库
+        insert_result = await self.context.message_history_manager.insert(
             platform_id=platform_id,
             user_id=group_id,
             content={"type": "user", "message": message_parts},
@@ -216,10 +259,103 @@ class QQGroupDailyAnalysis(Star):
             sender_name=sender_name,
         )
 
+        record_id = str(getattr(insert_result, "id", "") or "")
+        created_at = getattr(insert_result, "created_at", None)
+        logger.info(
+            "[TEMP][HistoryStore][AfterInsert] "
+            f"record_id={record_id} created_at={created_at} "
+            f"platform_id={platform_id} group_id={group_id} "
+            f"sender_id={sender_id} sender_name={sender_name} "
+            f"parts_count={len(message_parts)}"
+        )
+
         logger.debug(
             f"[{platform_id}] 已缓存群 {group_id} 的消息 (发送者: {sender_name})"
         )
 
+    @staticmethod
+    def _is_placeholder_sender_name(name: str | None, sender_id: str) -> bool:
+        """判断 sender_name 是否为空或占位值。"""
+        if not name:
+            return True
+        normalized = str(name).strip()
+        if not normalized:
+            return True
+        if normalized.lower() in {"unknown", "none", "null", "nil", "undefined"}:
+            return True
+        return normalized == str(sender_id).strip()
+
+    def _resolve_sender_name(self, event: AstrMessageEvent, sender_id: str) -> str:
+        """
+        解析发送者展示名。
+
+        优先级：
+        - Telegram:
+          1. raw_message.from_user.full_name
+          2. raw_message.from_user.first_name
+          3. event.get_sender_name() / message_obj.sender.nickname
+          4. raw_message.from_user.username
+          5. sender_id
+        - 其他平台：
+          1. event.get_sender_name()
+          2. message_obj.sender.nickname
+          3. raw_message.from_user.full_name / first_name / username
+          4. sender_id（最终回退，避免消息丢失）
+        """
+        platform_name = str(event.get_platform_name() or "").lower()
+        candidates: list[str | None] = []
+
+        msg_obj = getattr(event, "message_obj", None)
+        sender_obj = getattr(msg_obj, "sender", None)
+        raw_message = getattr(msg_obj, "raw_message", None)
+        raw_msg_obj = getattr(raw_message, "message", raw_message)
+        from_user = getattr(raw_msg_obj, "from_user", None)
+
+        # Telegram 特殊策略：优先显示名，不优先 username
+        if platform_name == "telegram":
+            if from_user is not None:
+                full_name = getattr(from_user, "full_name", None)
+                first_name = getattr(from_user, "first_name", None)
+                username = getattr(from_user, "username", None)
+                logger.info(
+                    "[TEMP][SenderNameRaw] "
+                    f"sender_id={sender_id} full_name={full_name} "
+                    f"first_name={first_name} username={username} "
+                    f"event_sender_name={event.get_sender_name()}"
+                )
+                candidates.extend([full_name, first_name])
+
+            candidates.append(event.get_sender_name())
+            if sender_obj is not None:
+                candidates.append(getattr(sender_obj, "nickname", None))
+
+            if from_user is not None:
+                candidates.append(getattr(from_user, "username", None))
+        else:
+            candidates.append(event.get_sender_name())
+            if sender_obj is not None:
+                candidates.append(getattr(sender_obj, "nickname", None))
+
+        if from_user is not None:
+            candidates.extend(
+                [
+                    getattr(from_user, "full_name", None),
+                    getattr(from_user, "first_name", None),
+                    getattr(from_user, "username", None),
+                ]
+            )
+
+        for candidate in candidates:
+            name = str(candidate or "").strip()
+            if not self._is_placeholder_sender_name(name, sender_id):
+                return name
+
+        logger.warning(
+            f"[HistoryStore] 无法解析昵称，回退为 sender_id: {sender_id} "
+            f"(platform={event.get_platform_id()})"
+        )
+        return sender_id
+
     def _extract_message_parts(self, event: AstrMessageEvent) -> list[dict]:
         """
         从事件中提取消息内容
@@ -252,10 +388,18 @@ class QQGroupDailyAnalysis(Star):
 
                 elif seg_type in ("At", "at"):
                     target = getattr(seg, "target", None)
+                    if target is None:
+                        target = getattr(seg, "qq", None)
                     if target is None and hasattr(seg, "data"):
                         target = seg.data.get("qq") or seg.data.get("target")
                     if target:
-                        message_parts.append({"type": "at", "target_id": str(target)})
+                        message_parts.append(
+                            {
+                                "type": "at",
+                                "target_id": str(target),
+                                "name": str(getattr(seg, "name", "") or ""),
+                            }
+                        )
 
         # 如果没有从消息链提取到内容，尝试使用 message_str
         if not message_parts and event.message_str:
diff --git a/src/infrastructure/platform/adapters/telegram_adapter.py b/src/infrastructure/platform/adapters/telegram_adapter.py
index a9ae74f..bd48a76 100644
--- a/src/infrastructure/platform/adapters/telegram_adapter.py
+++ b/src/infrastructure/platform/adapters/telegram_adapter.py
@@ -5,6 +5,7 @@ Telegram 平台适配器
 通过 AstrBot 的 message_history_manager 存储和读取消息历史。
 """
 
+from dataclasses import replace
 from datetime import datetime, timedelta, timezone
 from io import BytesIO
 from typing import TYPE_CHECKING, Any
@@ -170,6 +171,16 @@ class TelegramAdapter(PlatformAdapter):
             cutoff_time = datetime.now(timezone.utc) - timedelta(days=days)
 
             messages = []
+            sender_name_cache: dict[str, str] = {}
+            # 先用本批历史记录中已有的有效昵称预热缓存，减少额外 API 请求
+            for record in history_records:
+                sender_id = str(getattr(record, "sender_id", "") or "").strip()
+                sender_name = str(getattr(record, "sender_name", "") or "").strip()
+                if sender_id and not self._is_placeholder_sender_name(
+                    sender_name, sender_id
+                ):
+                    sender_name_cache[sender_id] = sender_name
+
             for record in history_records:
                 # before_id 过滤，仅保留更早的记录
                 if before_id_int is not None:
@@ -196,6 +207,9 @@ class TelegramAdapter(PlatformAdapter):
                         continue
                     if msg.sender_id in self.bot_self_ids:
                         continue
+                    msg = await self._fix_sender_name_if_needed(
+                        group_id, msg, sender_name_cache
+                    )
                     messages.append(msg)
 
             messages.sort(key=lambda m: m.timestamp)
@@ -230,6 +244,70 @@ class TelegramAdapter(PlatformAdapter):
                 pass
         return "telegram"
 
+    @staticmethod
+    def _is_placeholder_sender_name(name: str | None, sender_id: str | None) -> bool:
+        """判断 sender_name 是否属于占位值。"""
+        if not name:
+            return True
+        normalized = str(name).strip()
+        if not normalized:
+            return True
+        if normalized.lower() in {"unknown", "none", "null", "nil", "undefined"}:
+            return True
+        if sender_id and normalized == str(sender_id).strip():
+            return True
+        return False
+
+    async def _fix_sender_name_if_needed(
+        self,
+        group_id: str,
+        msg: UnifiedMessage,
+        sender_name_cache: dict[str, str],
+    ) -> UnifiedMessage:
+        """
+        如果 sender_name 是占位值，尝试通过 get_member_info 修复。
+
+        说明：
+        - 兼容历史脏数据（sender_name 写成 user_id / Unknown）
+        - 使用 sender_id 级缓存，避免重复请求 Telegram API
+        """
+        if not self._is_placeholder_sender_name(msg.sender_name, msg.sender_id):
+            return msg
+
+        sender_id = str(msg.sender_id)
+        if sender_id in sender_name_cache:
+            cached_name = sender_name_cache[sender_id]
+            if cached_name == msg.sender_name:
+                return msg
+            logger.info(
+                "[TEMP][SenderNameFix][Cache] "
+                f"group_id={group_id} sender_id={sender_id} "
+                f"from={msg.sender_name} to={cached_name}"
+            )
+            return replace(msg, sender_name=cached_name)
+
+        resolved_name = msg.sender_name
+        try:
+            member = await self.get_member_info(group_id, sender_id)
+            if member:
+                candidate = str(member.nickname or "").strip()
+                if self._is_placeholder_sender_name(candidate, sender_id):
+                    candidate = str(member.card or "").strip()
+                if not self._is_placeholder_sender_name(candidate, sender_id):
+                    resolved_name = candidate
+        except Exception as e:
+            logger.debug(f"[Telegram] 修复 sender_name 失败 (uid={sender_id}): {e}")
+
+        sender_name_cache[sender_id] = resolved_name
+        if resolved_name == msg.sender_name:
+            return msg
+        logger.info(
+            "[TEMP][SenderNameFix][MemberInfo] "
+            f"group_id={group_id} sender_id={sender_id} "
+            f"from={msg.sender_name} to={resolved_name}"
+        )
+        return replace(msg, sender_name=resolved_name)
+
     def _convert_history_record(
         self, record: Any, group_id: str
     ) -> UnifiedMessage | None:
@@ -287,10 +365,13 @@ class TelegramAdapter(PlatformAdapter):
                     )
                 )
 
+            sender_id = str(record.sender_id or "")
+            sender_name = str(record.sender_name or "").strip() or "Unknown"
+
             return UnifiedMessage(
                 message_id=str(record.id),
-                sender_id=record.sender_id or "",
-                sender_name=record.sender_name or "Unknown",
+                sender_id=sender_id,
+                sender_name=sender_name,
                 sender_card=None,
                 group_id=group_id,
                 text_content=text_content,
@@ -561,7 +642,10 @@ class TelegramAdapter(PlatformAdapter):
                 members.append(
                     UnifiedMember(
                         user_id=str(user.id),
-                        nickname=user.first_name or user.username or "Unknown",
+                        nickname=user.full_name
+                        or user.first_name
+                        or user.username
+                        or "Unknown",
                         card=user.username,
                         role="admin" if admin.status == "administrator" else "owner",
                     )
@@ -594,7 +678,10 @@ class TelegramAdapter(PlatformAdapter):
 
             return UnifiedMember(
                 user_id=str(user.id),
-                nickname=user.first_name or user.username or "Unknown",
+                nickname=user.full_name
+                or user.first_name
+                or user.username
+                or "Unknown",
                 card=user.username,
                 role=role,
             )
diff --git a/src/infrastructure/reporting/generators.py b/src/infrastructure/reporting/generators.py
index 830705f..2cd3f4a 100644
--- a/src/infrastructure/reporting/generators.py
+++ b/src/infrastructure/reporting/generators.py
@@ -380,11 +380,15 @@ class ReportGenerator(IReportGenerator):
             if user_analysis and uid in user_analysis:
                 stats = user_analysis[uid]
                 name = stats.get("nickname") or stats.get("name")
+                if self._is_placeholder_display_name(name, uid):
+                    name = None
 
             # 2. 尝试通过回调获取实时昵称
             if not name and nickname_getter:
                 try:
                     name = await nickname_getter(uid)
+                    if self._is_placeholder_display_name(name, uid):
+                        name = None
                 except Exception as e:
                     logger.warning(f"获取昵称失败 {uid}: {e}")
 
@@ -400,7 +404,7 @@ class ReportGenerator(IReportGenerator):
             # 3. 最终后备: 确保有头像和名称
             if not url:
                 url = self._get_default_avatar_base64()
-            if not name:
+            if self._is_placeholder_display_name(name, uid):
                 name = str(uid)
 
             return (
@@ -427,6 +431,18 @@ class ReportGenerator(IReportGenerator):
 
         return result
 
+    @staticmethod
+    def _is_placeholder_display_name(name: str | None, user_id: str) -> bool:
+        """判断展示名称是否为占位值。"""
+        if not name:
+            return True
+        normalized = str(name).strip()
+        if not normalized:
+            return True
+        if normalized.lower() in {"unknown", "none", "null", "nil", "undefined"}:
+            return True
+        return normalized == str(user_id).strip()
+
     def _render_html_template(self, template: str, data: dict) -> str:
         """HTML模板渲染，使用 {{key}} 占位符格式