Update app.py

app.py

@@ -140,7 +140,7 @@ async def startup_event():
 
     # MongoDB
     mongo_client = get_mongo_client()
-    db = mongo_client.get_default_database()
+    db = mongo_client["cps_db"]
     patients_collection = db.get_collection("patients")
     analysis_collection = db.get_collection("patient_analysis_results")