Improve RAG init & docs new3

backend/main.py

@@ -64,8 +64,17 @@ def initialize_rag_system():
             print(f"[RAG Init] ✓ Processed and indexed {num_docs} documents")
             rag_ready = True
         elif processed_json.exists():
-            print("[RAG Init] processed_documents.json found. Using existing summaries.")
-            rag_ready = True
+            print("[RAG Init] processed_documents.json found. Building vectorstore from existing summaries...")
+            # Call process_and_index_documents even without PDFs to build vectorstore from JSON
+            # The method will detect no new PDFs and build from existing processed_documents.json
+            docs_path = str(docs_folder) if docs_folder.exists() else "documents"
+            num_docs = rag_system.process_and_index_documents(docs_path)
+            if rag_system.vectorstore is not None:
+                print(f"[RAG Init] ✓ Built vectorstore from processed_documents.json")
+                rag_ready = True
+            else:
+                print("[RAG Init] Warning: Could not build vectorstore from processed_documents.json")
+                rag_ready = False
         else:
             print("[RAG Init] No PDFs or processed_documents.json found. RAG remains uninitialized.")
             rag_ready = False