diff --git a/src/domain/entities/__init__.py b/src/domain/entities/__init__.py
index 755018f..df5dd89 100644
--- a/src/domain/entities/__init__.py
+++ b/src/domain/entities/__init__.py
@@ -21,14 +21,10 @@ from .analysis_result import (
 from .analysis_task import AnalysisTask, TaskStatus
 from .incremental_state import IncrementalBatch, IncrementalState
 
-# 别名，保持向后兼容
-AnalysisResult = GroupAnalysisResult
-
 __all__ = [
     "AnalysisTask",
     "TaskStatus",
     "GroupAnalysisResult",
-    "AnalysisResult",  # 别名
     "SummaryTopic",
     "UserTitle",
     "GoldenQuote",
diff --git a/src/infrastructure/persistence/incremental_store.py b/src/infrastructure/persistence/incremental_store.py
index 07ed819..b033c2a 100644
--- a/src/infrastructure/persistence/incremental_store.py
+++ b/src/infrastructure/persistence/incremental_store.py
@@ -356,85 +356,3 @@ class IncrementalStore:
         index.sort(key=lambda x: x.get("timestamp", 0))
         return index
 
-    # ================================================================
-    # 旧版兼容（迁移期间使用）
-    # ================================================================
-
-    async def migrate_legacy_state(
-        self, group_id: str, date_str: str
-    ) -> bool:
-        """
-        尝试迁移旧版按天存储的 IncrementalState 到新批次架构。
-
-        检查旧键 incremental_state_{group_id}_{date_str} 是否存在，
-        如果存在则将其数据转换为一个 IncrementalBatch 并保存，
-        然后删除旧键。
-
-        Args:
-            group_id: 群组 ID
-            date_str: 日期字符串 (YYYY-MM-DD)
-
-        Returns:
-            bool: 是否成功迁移（True=迁移了数据，False=无需迁移或失败）
-        """
-        old_key = f"incremental_state_{group_id}_{date_str}"
-
-        try:
-            old_data = await self.plugin.get_kv_data(old_key, None)
-            if old_data is None:
-                return False
-
-            logger.info(
-                f"发现旧版增量状态 (群 {group_id}, 日期 {date_str})，开始迁移"
-            )
-
-            # 从旧数据中提取信息构建一个聚合批次
-            batch = IncrementalBatch(
-                group_id=group_id,
-                timestamp=old_data.get("created_at", time.time()),
-                messages_count=old_data.get("total_message_count", 0),
-                characters_count=old_data.get("total_character_count", 0),
-                hourly_msg_counts=old_data.get("hourly_message_counts", {}),
-                hourly_char_counts=old_data.get("hourly_character_counts", {}),
-                user_stats=old_data.get("user_activities", {}),
-                emoji_stats=old_data.get("emoji_counts", {}),
-                topics=old_data.get("topics", []),
-                golden_quotes=old_data.get("golden_quotes", []),
-                token_usage=old_data.get("total_token_usage", {
-                    "prompt_tokens": 0,
-                    "completion_tokens": 0,
-                    "total_tokens": 0,
-                }),
-                last_message_timestamp=old_data.get(
-                    "last_analyzed_message_timestamp", 0
-                ),
-                participant_ids=list(
-                    old_data.get("all_participant_ids", [])
-                ),
-            )
-
-            # 保存为新批次
-            saved = await self.save_batch(batch)
-            if not saved:
-                logger.error(f"旧版数据迁移保存失败 (群 {group_id})")
-                return False
-
-            # 迁移最后分析时间戳
-            last_ts = old_data.get("last_analyzed_message_timestamp", 0)
-            if last_ts > 0:
-                await self.update_last_analyzed_timestamp(group_id, last_ts)
-
-            # 删除旧键
-            await self.plugin.put_kv_data(old_key, None)
-
-            logger.info(
-                f"旧版增量状态迁移完成 (群 {group_id}, 日期 {date_str}), "
-                f"消息数={batch.messages_count}"
-            )
-            return True
-
-        except Exception as e:
-            logger.error(
-                f"旧版增量状态迁移失败 (群 {group_id}): {e}", exc_info=True
-            )
-            return False