refine(trace): save prompts in the checkpoint output folder

openevolve/database.py

@@ -65,6 +65,9 @@ class Program:
     # Metadata
     metadata: Dict[str, Any] = field(default_factory=dict)
 
+    # Prompts
+    prompts: Optional[Dict[str, Any]] = None
+
     # Artifact storage
     artifacts_json: Optional[str] = None  # JSON-serialized small artifacts
     artifact_dir: Optional[str] = None  # Path to large artifact files

openevolve/iteration.py

@@ -119,6 +119,11 @@ async def run_iteration_with_shared_db(
         # Handle artifacts if they exist
         artifacts = evaluator.get_pending_artifacts(child_id)
 
+        # Set template_key of Prompts
+        template_key = (
+            "full_rewrite_user" if not config.diff_based_evolution else "diff_user"
+        )
+
         # Create a child program
         result.child_program = Program(
             id=child_id,
@@ -132,6 +137,13 @@ async def run_iteration_with_shared_db(
                 "changes": changes_summary,
                 "parent_metrics": parent.metrics,
             },
+            prompts={
+                template_key: {
+                    "system": prompt["system"],
+                    "user": prompt["user"],
+                    "responses": [llm_response] if llm_response is not None else [],
+                }
+            } if database.config.log_prompts else None,
         )
 
         result.prompt = prompt