refac

.env.example

@@ -19,6 +19,9 @@ ENABLE_MEMORY_SYSTEM_CONTEXT=true
 # Set to true to add compact row/column stats to parsed CSV retrieval context.
 ENABLE_RAG_CSV_SUMMARY=false
 
+# Set to true to preserve backing file records, storage blobs, and per-file vectors when files are removed from knowledge bases.
+ENABLE_KNOWLEDGE_FILE_RETENTION=false
+
 # Set to false to disable workspace Tools and Functions.
 ENABLE_PLUGINS=true