refac: metadata handling in vectordb

backend/open_webui/routers/retrieval.py

@@ -1229,27 +1229,14 @@ def save_docs_to_vector_db(
         {
             **doc.metadata,
             **(metadata if metadata else {}),
-            "embedding_config": json.dumps(
-                {
-                    "engine": request.app.state.config.RAG_EMBEDDING_ENGINE,
-                    "model": request.app.state.config.RAG_EMBEDDING_MODEL,
-                }
-            ),
+            "embedding_config": {
+                "engine": request.app.state.config.RAG_EMBEDDING_ENGINE,
+                "model": request.app.state.config.RAG_EMBEDDING_MODEL,
+            },
         }
         for doc in docs
     ]
 
-    # ChromaDB does not like datetime formats
-    # for meta-data so convert them to string.
-    for metadata in metadatas:
-        for key, value in metadata.items():
-            if (
-                isinstance(value, datetime)
-                or isinstance(value, list)
-                or isinstance(value, dict)
-            ):
-                metadata[key] = str(value)
-
     try:
         if VECTOR_DB_CLIENT.has_collection(collection_name=collection_name):
             log.info(f"collection {collection_name} already exists")