fix(memory): handle langchain-community SQLChatMessageHistory API rename

langchain-community >= 0.3 renamed connection_string to connection
in SQLChatMessageHistory.__init__(). Use the new 'connection' kwarg
first and fall back to 'connection_string' for older versions.

Also updates the test assertion in memory_service_coverage_steps.py
to accept either parameter name.

Fixes CI errors in:
- plan_service_coverage.feature:128,141
- consolidated_misc.feature:1531

features/steps/memory_service_coverage_steps.py

@@ -342,7 +342,10 @@ def step_validate_sql_constructor(context: Any) -> None:
     assert context.sql_history_calls
     _, kwargs = context.sql_history_calls[0]
     assert kwargs["session_id"] == "sql-session"
-    assert kwargs["connection_string"] == context.connection_string
+    actual_connection = kwargs.get("connection") or kwargs.get("connection_string")
+    assert actual_connection == context.connection_string, (
+        f"Expected {context.connection_string}, got {actual_connection}"
+    )
     assert kwargs.get("table_name") == "message_history"
 
 

src/cleveragents/application/services/memory_service.py

@@ -485,15 +485,26 @@ class MemoryService:
         # Initialize message history
         history: BaseChatMessageHistory
         if connection_string:
-            # Use SQL persistence if connection string provided
-            history = cast(
-                BaseChatMessageHistory,
-                SQLChatMessageHistory(
-                    session_id=session_id,
-                    connection_string=connection_string,
-                    table_name="message_history",
-                ),
-            )
+            # Use SQL persistence if connection string provided.
+            # langchain-community >= 0.3 renamed connection_string to connection.
+            try:
+                history = cast(
+                    BaseChatMessageHistory,
+                    SQLChatMessageHistory(
+                        session_id=session_id,
+                        connection=connection_string,
+                        table_name="message_history",
+                    ),
+                )
+            except TypeError:
+                history = cast(
+                    BaseChatMessageHistory,
+                    SQLChatMessageHistory(
+                        session_id=session_id,
+                        connection_string=connection_string,
+                        table_name="message_history",
+                    ),
+                )
         else:
             # Use in-memory storage as fallback
             history = InMemoryChatMessageHistory()