Fix the issues when reviewing 2566 persistant part (#2604)

* Fix the code review command of journal & event store P0,P1 issues

* Fix the code review command of journal & event store P2 issues

* Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update backend/packages/harness/deerflow/runtime/journal.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Refactor logger debug message formatting

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

backend/packages/harness/deerflow/runtime/converters.py

@@ -1,6 +1,8 @@
 """Pure functions to convert LangChain message objects to OpenAI Chat Completions format.
 
-Used by RunJournal to build content dicts for event storage.
+Utility for translating LangChain message types to OpenAI-compatible dicts.
+Not currently wired into RunJournal (which uses message.model_dump() directly),
+but available for consumers that need the OpenAI wire format.
 """
 
 from __future__ import annotations

backend/packages/harness/deerflow/runtime/journal.py

@@ -62,9 +62,6 @@ class RunJournal(BaseCallbackHandler):
         self._total_output_tokens = 0
         self._total_tokens = 0
         self._llm_call_count = 0
-        self._lead_agent_tokens = 0
-        self._subagent_tokens = 0
-        self._middleware_tokens = 0
 
         # Convenience fields
         self._last_ai_msg: str | None = None
@@ -76,7 +73,7 @@ class RunJournal(BaseCallbackHandler):
 
         # LLM request/response tracking
         self._llm_call_index = 0
-        self._cached_prompts: dict[str, list[dict]] = {}  # langchain run_id -> OpenAI messages
+        self._seen_llm_starts: set[str] = set()  # langchain run_ids that fired on_chat_model_start
 
     # -- Lifecycle callbacks --
 
@@ -135,8 +132,7 @@ class RunJournal(BaseCallbackHandler):
         rid = str(run_id)
         self._llm_start_times[rid] = time.monotonic()
         self._llm_call_index += 1
-        # Mark this run_id as seen so on_llm_end knows not to increment again.
-        self._cached_prompts[rid] = []
+        self._seen_llm_starts.add(rid)
 
         logger.debug(
             "on_chat_model_start %s: tags=%s num_batches=%d message_counts=%s",
@@ -148,8 +144,8 @@ class RunJournal(BaseCallbackHandler):
 
         # Capture the first human message sent to any LLM in this run.
         if not self._first_human_msg and messages:
-            for batch in messages.reversed():
-                for m in batch.reversed():
+            for batch in reversed(messages):
+                for m in reversed(batch):
                     if isinstance(m, HumanMessage) and m.name != "summary":
                         caller = self._identify_caller(tags)
                         self.set_first_human_message(m.text)
@@ -167,9 +163,17 @@ class RunJournal(BaseCallbackHandler):
         # Fallback: on_chat_model_start is preferred. This just tracks latency.
         self._llm_start_times[str(run_id)] = time.monotonic()
 
-    def on_llm_end(self, response, *, run_id, parent_run_id, tags, **kwargs) -> None:
+    def on_llm_end(
+        self,
+        response: Any,
+        *,
+        run_id: UUID,
+        parent_run_id: UUID | None = None,
+        tags: list[str] | None = None,
+        **kwargs: Any,
+    ) -> None:
         messages: list[AnyMessage] = []
-        logger.info(f"on_llm_end {run_id}: response: {tags} {kwargs}")
+        logger.debug("on_llm_end %s: tags=%s", run_id, tags)
         for generation in response.generations:
             for gen in generation:
                 if hasattr(gen, "message"):
@@ -191,10 +195,11 @@ class RunJournal(BaseCallbackHandler):
 
             # Resolve call index
             call_index = self._llm_call_index
-            if rid not in self._cached_prompts:
+            if rid not in self._seen_llm_starts:
                 # Fallback: on_chat_model_start was not called
                 self._llm_call_index += 1
                 call_index = self._llm_call_index
+                self._seen_llm_starts.add(rid)
 
             # Trace event: llm_response (OpenAI completion format)
             self._put(
@@ -229,7 +234,7 @@ class RunJournal(BaseCallbackHandler):
     def on_tool_start(self, serialized, input_str, *, run_id, parent_run_id=None, tags=None, metadata=None, inputs=None, **kwargs):
         """Handle tool start event, cache tool call ID for later correlation"""
         tool_call_id = str(run_id)
-        logger.info(f"Tool start for node {run_id}, tool_call_id={tool_call_id}, tags={tags}, metadata={metadata}")
+        logger.debug("Tool start for node %s, tool_call_id=%s, tags=%s", run_id, tool_call_id, tags)
 
     def on_tool_end(self, output, *, run_id, parent_run_id=None, **kwargs):
         """Handle tool end event, append message and clear node data"""
@@ -248,7 +253,7 @@ class RunJournal(BaseCallbackHandler):
             else:
                 logger.warning(f"on_tool_end {run_id}: output is not ToolMessage: {type(output)}")
         finally:
-            logger.info(f"Tool end for node {run_id}")
+            logger.debug("Tool end for node %s", run_id)
 
     # -- Internal methods --
 
@@ -313,8 +318,8 @@ class RunJournal(BaseCallbackHandler):
         if exc:
             logger.warning("Journal flush task failed: %s", exc)
 
-    def _identify_caller(self, tags: list[str] | None, **kwargs) -> str:
-        _tags = tags or kwargs.get("tags", [])
+    def _identify_caller(self, tags: list[str] | None) -> str:
+        _tags = tags or []
         for tag in _tags:
             if isinstance(tag, str) and (tag.startswith("subagent:") or tag.startswith("middleware:") or tag == "lead_agent"):
                 return tag
@@ -371,9 +376,6 @@ class RunJournal(BaseCallbackHandler):
             "total_output_tokens": self._total_output_tokens,
             "total_tokens": self._total_tokens,
             "llm_call_count": self._llm_call_count,
-            "lead_agent_tokens": self._lead_agent_tokens,
-            "subagent_tokens": self._subagent_tokens,
-            "middleware_tokens": self._middleware_tokens,
             "message_count": self._msg_count,
             "last_ai_message": self._last_ai_msg,
             "first_human_message": self._first_human_msg,

backend/tests/test_run_journal.py

@@ -381,3 +381,62 @@ class TestMiddlewareEvents:
         event_types = {e["event_type"] for e in events}
         assert "middleware:title" in event_types
         assert "middleware:guardrail" in event_types
+
+
+class TestChatModelStartHumanMessage:
+    """Tests for on_chat_model_start extracting the first human message."""
+
+    @pytest.mark.anyio
+    async def test_extracts_first_human_message(self, journal_setup):
+        """on_chat_model_start captures the first HumanMessage from prompts."""
+        from langchain_core.messages import AIMessage, HumanMessage
+
+        j, store = journal_setup
+        messages_batch = [
+            [HumanMessage(content="What is AI?"), AIMessage(content="Hi there")],
+        ]
+        j.on_chat_model_start({}, messages_batch, run_id=uuid4(), tags=["lead_agent"])
+        await j.flush()
+
+        assert j._first_human_msg == "What is AI?"
+        events = await store.list_events("t1", "r1")
+        human_events = [e for e in events if e["event_type"] == "llm.human.input"]
+        assert len(human_events) == 1
+        assert human_events[0]["content"]["content"] == "What is AI?"
+
+    @pytest.mark.anyio
+    async def test_skips_summary_named_human_messages(self, journal_setup):
+        """HumanMessages with name='summary' are skipped."""
+        from langchain_core.messages import HumanMessage
+
+        j, store = journal_setup
+        messages_batch = [
+            [HumanMessage(content="Summarized context", name="summary"), HumanMessage(content="Real question")],
+        ]
+        j.on_chat_model_start({}, messages_batch, run_id=uuid4(), tags=["lead_agent"])
+        await j.flush()
+
+        assert j._first_human_msg == "Real question"
+
+    @pytest.mark.anyio
+    async def test_only_first_human_message_captured(self, journal_setup):
+        """Subsequent on_chat_model_start calls do not overwrite the first message."""
+        from langchain_core.messages import HumanMessage
+
+        j, store = journal_setup
+        j.on_chat_model_start({}, [[HumanMessage(content="First question")]], run_id=uuid4(), tags=["lead_agent"])
+        j.on_chat_model_start({}, [[HumanMessage(content="Second question")]], run_id=uuid4(), tags=["lead_agent"])
+        await j.flush()
+
+        assert j._first_human_msg == "First question"
+        events = await store.list_events("t1", "r1")
+        human_events = [e for e in events if e["event_type"] == "llm.human.input"]
+        assert len(human_events) == 1
+
+    @pytest.mark.anyio
+    async def test_empty_messages_no_crash(self, journal_setup):
+        """on_chat_model_start with empty messages does not crash."""
+        j, store = journal_setup
+        j.on_chat_model_start({}, [], run_id=uuid4(), tags=["lead_agent"])
+        await j.flush()
+        assert j._first_human_msg is None