Update app.py

app.py

@@ -16,6 +16,27 @@ device = Config.get_device()
 model = SentenceTransformer(config.MODEL_PATH)
 collection = None
 
+print(f"🔄 Connecting to ChromaDB from cloud...")
+client = chromadb.CloudClient(
+    api_key=os.environ.get("chromadb_api_key",""),
+    tenant=os.environ.get("chromadb_tenant",""),
+    database=os.environ.get("chromadb_db","")
+)
+        
+# === COLLECTION VALIDATION ===
+# Ensure the required collection exists and has data
+try:
+    collection = client.get_collection(config.COLLECTION_NAME)
+    doc_count = collection.count()
+    
+    if doc_count == 0:
+        return False, f"Collection '{config.COLLECTION_NAME}' exists but is empty. Run ingest_studies.py to populate it."
+        
+    print(f"✅ Connected to collection '{config.COLLECTION_NAME}' with {doc_count} documents")
+    
+except Exception as e:
+    return False, f"Collection '{config.COLLECTION_NAME}' not found. Run ingest_studies.py first. Error: {str(e)}"
+
 
 class EmbeddingGemmaPrompts:
     """