Update app.py

app.py

@@ -308,7 +308,14 @@ async def on_chat_start():
     )
     
     embeddings = NomicEmbeddings(model="nomic-embed-text-v1.5")
+
+    # Clear the existing Chroma vector store
+    docsearch = await cl.make_async(Chroma.from_texts)(
+        [], embeddings, metadatas=[]
+    )
+    docsearch.delete()
     
+    # Create a new Chroma vector store
     docsearch = await cl.make_async(Chroma.from_texts)(
         [anonymized_text], embeddings, metadatas=[{"source": "0-pl"}]
     )