better：优化做梦表现

src/dream/tools/create_chat_history_tool.py

@@ -0,0 +1,65 @@
+import time
+
+from src.common.logger import get_logger
+from src.common.database.database_model import ChatHistory
+
+logger = get_logger("dream_agent")
+
+
+def make_create_chat_history(chat_id: str):
+    async def create_chat_history(
+        theme: str,
+        summary: str,
+        keywords: str,
+        key_point: str,
+        start_time: float,
+        end_time: float,
+    ) -> str:
+        """创建一条新的 ChatHistory 概括记录（用于整理/合并后的新记忆）"""
+        try:
+            logger.info(
+                f"[dream][tool] 调用 create_chat_history("
+                f"theme={bool(theme)}, summary={bool(summary)}, "
+                f"keywords={bool(keywords)}, key_point={bool(key_point)}, "
+                f"start_time={start_time}, end_time={end_time}) (chat_id={chat_id})"
+            )
+
+            now_ts = time.time()
+
+            # 将传入的 start_time/end_time（如果有）解析为时间戳；否则回退为当前时间
+            def _parse_ts(value, default):
+                if value is None:
+                    return default
+                try:
+                    return float(value)
+                except (TypeError, ValueError):
+                    return default
+
+            start_ts = _parse_ts(start_time, now_ts)
+            end_ts = _parse_ts(end_time, now_ts)
+
+            record = ChatHistory.create(
+                chat_id=chat_id,
+                theme=theme,
+                summary=summary,
+                keywords=keywords,
+                key_point=key_point,
+                # 对于由 dream 整理产生的新概括，时间范围优先使用工具提供的时间，否则使用当前时间占位
+                start_time=start_ts,
+                end_time=end_ts,
+            )
+
+            msg = (
+                f"已创建新的 ChatHistory 记录，ID={record.id}，"
+                f"theme={record.theme or '无'}，summary={'有' if record.summary else '无'}。"
+            )
+            logger.info(f"[dream][tool] create_chat_history 完成: {msg}")
+            return msg
+        except Exception as e:
+            logger.error(f"create_chat_history 失败: {e}")
+            return f"create_chat_history 执行失败: {e}"
+
+    return create_chat_history
+
+
+