chore: Finalize cleanup phases (docstrings, utility consolidation, dev app isolation)

backend/src/ea_chatbot/history/utils.py

@@ -1,30 +0,0 @@
-"""Utility functions for history management."""
-from typing import List
-from langchain_core.messages import BaseMessage, HumanMessage, AIMessage, SystemMessage
-from ea_chatbot.history.models import Message
-
-def map_db_messages_to_langchain(db_messages: List[Message]) -> List[BaseMessage] :
-    """
-    Converts a list of database Message models to LangChain BaseMessage objects.
-    
-    Args:
-        db_messages: List of Message objects from the database.
-        
-    Returns:
-        List of HumanMessage, AIMessage, or SystemMessage objects.
-    """
-    lc_messages: List[BaseMessage] = []
-    
-    for m in db_messages:
-        role = m.role.lower()
-        if role == "user":
-            lc_messages.append(HumanMessage(content=m.content))
-        elif role == "assistant":
-            lc_messages.append(AIMessage(content=m.content))
-        elif role == "system":
-            lc_messages.append(SystemMessage(content=m.content))
-        else:
-            # Default to HumanMessage for unknown roles
-            lc_messages.append(HumanMessage(content=m.content))
-            
-    return lc_messages