调整总结业务。支持每天早上9点总结昨天的消息

db/message_storage.py

@@ -342,3 +342,59 @@ class MessageStorageDB(BaseDBOperator):
 
         # 限制最大返回数量（5000条足以覆盖1-2天的活跃群聊）
         return messages[:max_results] if messages else []
+
+    def get_messages_by_date_range(self, group_id: str, start_time: datetime, end_time: datetime) -> List[Dict]:
+        """获取指定时间范围内的消息
+
+        Args:
+            group_id: 群组ID
+            start_time: 开始时间
+            end_time: 结束时间
+
+        Returns:
+            消息列表
+        """
+        sql = """
+        SELECT timestamp, sender, content, message_type
+        FROM messages
+        WHERE timestamp >= %s
+          AND timestamp <= %s
+          AND message_type in (1, 49)
+          AND group_id = %s
+          AND length(content) > 6
+          AND CHAR_LENGTH(content) < 300
+          AND content NOT LIKE '/%'
+        ORDER BY timestamp ASC
+        """
+        params = (start_time.strftime('%Y-%m-%d %H:%M:%S'),
+                  end_time.strftime('%Y-%m-%d %H:%M:%S'),
+                  group_id)
+        return self.execute_query(sql, params) or []
+
+    def count_messages_by_date_range(self, group_id: str, start_time: datetime, end_time: datetime) -> int:
+        """统计指定时间范围内的消息数量
+
+        Args:
+            group_id: 群组ID
+            start_time: 开始时间
+            end_time: 结束时间
+
+        Returns:
+            消息数量
+        """
+        sql = """
+        SELECT COUNT(*) as count
+        FROM messages
+        WHERE timestamp >= %s
+          AND timestamp <= %s
+          AND message_type in (1, 49)
+          AND group_id = %s
+          AND length(content) > 6
+          AND CHAR_LENGTH(content) < 300
+          AND content NOT LIKE '/%'
+        """
+        params = (start_time.strftime('%Y-%m-%d %H:%M:%S'),
+                  end_time.strftime('%Y-%m-%d %H:%M:%S'),
+                  group_id)
+        result = self.execute_query(sql, params)
+        return result[0]['count'] if result else 0