fix: resolve Python anti-patterns and remove duplicate rrf entry

demo/utils/simple_memory_manager.py

@@ -244,11 +244,10 @@ async def search(
             query: Query text
             top_k: Number of results to return (default: 3)
             mode: Retrieval mode (default: "rrf")
-                - "rrf": RRF fusion (recommended)
                 - "keyword": Keyword retrieval (BM25)
                 - "vector": Vector retrieval
+                - "rrf": Keyword + Vector + Reciprocal Rank Fusion (recommended)
                 - "hybrid": Keyword + Vector + Rerank
-                - "rrf": Keyword + Vector + RRF fusion
                 - "agentic": LLM-guided multi-round retrieval
             show_details: Whether to show detailed information (default: True)
 

src/biz_layer/mem_db_operations.py

@@ -143,7 +143,7 @@ def _convert_timestamp_to_time(
             try:
                 dt = from_iso_format(timestamp)
                 return to_iso_format(dt)
-            except:
+            except Exception:
                 # If parsing fails, return string directly
                 return timestamp
         else:

src/biz_layer/mem_memorize.py

@@ -1290,7 +1290,7 @@ async def memorize(request: MemorizeRequest) -> int:
     # ===== Preprocess and get historical data =====
     if request.raw_data_type == RawDataType.CONVERSATION:
         request = await preprocess_conv_request(request, current_time)
-        if request == None:
+        if request is None:
             logger.warning(f"[mem_memorize] preprocess_conv_request returned None")
             return 0
 
@@ -1326,7 +1326,7 @@ async def memorize(request: MemorizeRequest) -> int:
     )
     logger.debug(f"[mem_memorize] Extracting MemCell took: {time.perf_counter() - memcell_start} seconds")
 
-    if memcell_result == None:
+    if memcell_result is None:
         logger.warning(f"[mem_memorize] Skipped extracting MemCell")
         return 0
 
@@ -1345,7 +1345,7 @@ async def memorize(request: MemorizeRequest) -> int:
         )
     logger.info("=" * 80)
 
-    if memcell == None:
+    if memcell is None:
         # No boundary detected, confirm current messages to accumulation (sync_status: -1 -> 0)
         await conversation_data_repo.save_conversation_data(
             request.new_raw_data_list, request.group_id

src/infra_layer/adapters/out/search/repository/episodic_memory_milvus_repository.py

@@ -124,7 +124,7 @@ async def create_and_save_episodic_memory(
                 metadata_json = metadata
                 try:
                     metadata_dict = json.loads(metadata)
-                except:
+                except Exception:
                     metadata_dict = {}
 
             # Prepare entity data